/* ===== CSS Variables - Academic Red & White Theme ===== */
:root {
    /* Primary Academic Red Palette */
    --primary-color: #C8102E;        /* Classic academic crimson */
    --primary-dark: #9E0B23;         /* Deep burgundy */
    --primary-light: #E63946;        /* Bright accent red */
    --secondary-color: #DC143C;      /* Crimson highlight */
    --accent-color: #B8860B;         /* Academic gold */
    --danger-color: #D32F2F;         /* Error red */
    --success-color: #2E7D32;        /* Success green */
    --warning-color: #ED6C02;        /* Warning orange */

    /* Background Colors */
    --bg-primary: #FAFAFA;           /* Off-white background */
    --bg-secondary: #FFFFFF;         /* Pure white */
    --bg-tertiary: #F5F5F5;          /* Light gray */
    --bg-dark: #1A1A1A;              /* Dark gray for contrast */
    --bg-red-subtle: #FFF5F5;        /* Subtle red tint */

    /* Text Colors */
    --text-primary: #212121;         /* Almost black */
    --text-secondary: #616161;       /* Medium gray */
    --text-light: #9E9E9E;           /* Light gray */
    --text-white: #FFFFFF;           /* Pure white */
    --text-red: #C8102E;             /* Red text */

    /* Border & Shadows */
    --border-color: #E0E0E0;
    --border-red: #C8102E;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.12);
    --shadow-red: 0 4px 12px rgba(200, 16, 46, 0.15);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

/* Improve touch behavior */
* {
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    font-size: 16px;
    letter-spacing: -0.01em;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.88)),
        url('../images/coding-study-session-stockcake.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
}

/* Modern headings */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.03em;
}

h1 { font-size: 2.75rem; margin-bottom: 1rem; }
h2 { font-size: 2.25rem; margin-bottom: 0.875rem; }
h3 { font-size: 1.5rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.25rem; margin-bottom: 0.625rem; }

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    font-family: inherit;
}

input, select, textarea {
    font-family: inherit;
}

/* ===== Navigation ===== */
.navbar {
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.03em;
}

.logo-icon {
    font-size: 1.75rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-primary);
}

.nav-link.active {
    color: var(--primary-color);
}

.btn-signup {
    background-color: var(--primary-color);
    color: var(--text-white) !important;
}

.btn-signup:hover {
    background-color: var(--primary-dark);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: 0.5rem;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

.btn-logout {
    padding: 0.5rem 1rem;
    background-color: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-logout:hover {
    background-color: var(--bg-red-subtle);
    color: var(--primary-color);
}

/* ===== Main Content ===== */
.main-content {
    min-height: calc(100vh - 72px);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.page-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

.page-header h2 {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===== Buttons - Academic Style ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9375rem;
    border: none;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    gap: 0.5rem;
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-red);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    box-shadow: 0 6px 16px rgba(200, 16, 46, 0.25);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

.btn-danger {
    background-color: var(--danger-color);
    color: var(--text-white);
}

.btn-danger:hover {
    background-color: #B71C1C;
}

.btn-success {
    background-color: var(--success-color);
    color: var(--text-white);
}

.btn-warning {
    background-color: var(--warning-color);
    color: var(--text-white);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.btn-icon:hover {
    color: var(--primary-color);
    background-color: var(--bg-red-subtle);
}

/* ===== Hero Section - Academic ===== */
.hero {
    text-align: center;
    padding: 5rem 1.5rem 4rem;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 600px;
    height: 400px;
    background: radial-gradient(ellipse at center, rgba(200, 16, 46, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.hero h1::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    margin: 1.5rem auto 0;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* ===== Features - Academic Cards ===== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 3rem 1.5rem 4rem;
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--border-color) 20%, var(--border-color) 80%, transparent 100%);
}

.feature-card {
    background-color: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    border-top: 4px solid var(--primary-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    color: var(--primary-color);
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Auth Forms ===== */
.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 150px);
    padding: 2rem 1.5rem;
    position: relative;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(200, 16, 46, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(200, 16, 46, 0.04) 0%, transparent 50%);
}

.auth-card {
    background-color: var(--bg-secondary);
    padding: 3rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border-top: 5px solid var(--primary-color);
    width: 100%;
    max-width: 480px;
}

.auth-card h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 0.75rem;
    text-align: center;
    color: var(--text-primary);
}

.auth-subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ===== Form Elements ===== */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.form-group label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem 1.125rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.25s ease;
    background-color: var(--bg-secondary);
    outline: none;
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: var(--text-secondary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.1);
}

/* Remove default browser outline for all form elements */
.form-group input:focus-visible,
.form-group select:focus-visible,
.form-group textarea:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: none;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23616161' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-error {
    color: var(--danger-color);
    font-size: 0.875rem;
    min-height: 1.25rem;
}

.form-container {
    max-width: 600px;
    margin: 0 auto;
}

.form-section {
    background-color: var(--bg-secondary);
    padding: 1.75rem;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

.form-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.form-section .form-group {
    margin-bottom: 1rem;
}

.form-section .form-group:last-child {
    margin-bottom: 0;
}

.session-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 0.5rem;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input {
    width: 1rem;
    height: 1rem;
}

/* ===== Filters ===== */
.filters-container {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    font-size: 0.875rem;
    font-weight: 500;
}

.filter-group select {
    padding: 0.625rem 2.5rem 0.625rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    min-width: 180px;
    background-color: var(--bg-secondary);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23616161' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    outline: none;
    transition: all 0.25s ease;
}

.filter-group select:focus,
.filter-group select:focus-visible {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.1);
    outline: none;
}

.filter-group select:hover {
    border-color: var(--text-secondary);
}

/* ===== Session Cards ===== */
.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.session-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 5px solid var(--primary-color);
    padding: 1.75rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.session-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-red);
    border-left-color: var(--primary-dark);
}

.session-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.25rem;
}

.session-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.session-module {
    display: inline-block;
    background-color: var(--bg-red-subtle);
    color: var(--primary-color);
    border: 1px solid var(--primary-light);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.session-status {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.session-status.open {
    background-color: #D1FAE5;
    color: #065F46;
}

.session-status.full {
    background-color: #FEE2E2;
    color: #991B1B;
}

.session-details {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.session-detail {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.session-detail-icon {
    width: 1rem;
}

.session-preferences {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.preference-tag {
    background-color: var(--bg-primary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.session-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.session-creator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.creator-avatar {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

.creator-name {
    font-size: 0.875rem;
    font-weight: 500;
}

.creator-rating {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ===== Profile ===== */
.profile-container {
    max-width: 800px;
    margin: 0 auto;
}

.profile-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-white);
}

.profile-info {
    flex: 1;
}

.profile-info h2 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.profile-year {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.profile-email {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.profile-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.rating-count {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.profile-section {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

.profile-section h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.modules-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.module-tag {
    background-color: var(--primary-light);
    color: var(--text-white);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-sm);
}

.tab-btn.active {
    color: var(--primary-color);
    background-color: var(--bg-primary);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--border-color);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1.25rem;
    opacity: 0.7;
}

.empty-state h3 {
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    background-color: var(--bg-secondary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--secondary-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.info {
    border-left: 4px solid var(--primary-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== Utilities ===== */
.hidden {
    display: none !important;
}

/* ===== Modern Decorative Elements ===== */

/* Animated background gradient blobs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    pointer-events: none;
    z-index: -1;
}

body::before {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, rgba(200, 16, 46, 0.15) 0%, rgba(230, 57, 70, 0.1) 100%);
    top: -100px;
    right: -100px;
    animation: floatBlob 20s ease-in-out infinite;
}

body::after {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, rgba(184, 134, 11, 0.1) 0%, rgba(200, 16, 46, 0.08) 100%);
    bottom: -50px;
    left: -50px;
    animation: floatBlob 25s ease-in-out infinite reverse;
}

@keyframes floatBlob {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(-30px, -20px) scale(1.02);
    }
}

/* Subtle dot grid pattern overlay */
.main-content {
    position: relative;
}

.main-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle, rgba(200, 16, 46, 0.03) 1px, transparent 1px);
    background-size: 30px 30px;
    pointer-events: none;
    z-index: -1;
}

/* Decorative corner accents for cards */
.feature-card::before,
.session-card::before,
.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, transparent 50%, rgba(200, 16, 46, 0.05) 50%);
    border-radius: 0 var(--radius-lg) 0 0;
    pointer-events: none;
}

.feature-card,
.session-card,
.auth-card {
    position: relative;
    overflow: hidden;
}

/* Animated underline for headings */
.page-header h2::after {
    content: '';
    display: block;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    margin-top: 0.5rem;
    transition: width 0.5s ease;
}

.page-header:hover h2::after {
    width: 100px;
}

/* Decorative line separators */
.features::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 100%;
    background: linear-gradient(180deg, transparent 0%, var(--border-color) 20%, var(--border-color) 80%, transparent 100%);
    display: none;
}

@media (min-width: 769px) {
    .features::after {
        display: block;
    }
}

/* Floating shapes decoration */
.hero::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 10%;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, rgba(200, 16, 46, 0.08) 0%, transparent 70%);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    animation: morphShape 15s ease-in-out infinite;
    pointer-events: none;
}

@keyframes morphShape {
    0%, 100% {
        border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
        transform: rotate(0deg);
    }
    50% {
        border-radius: 70% 30% 30% 70% / 70% 70% 30% 30%;
        transform: rotate(180deg);
    }
}

/* Glow effect on primary buttons hover */
.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: inherit;
    background: inherit;
    filter: blur(15px);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.btn-primary {
    position: relative;
    overflow: visible;
}

.btn-primary:hover::before {
    opacity: 0.4;
}

/* Decorative rings for empty states */
.empty-state::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 2px dashed rgba(200, 16, 46, 0.1);
    border-radius: 50%;
    pointer-events: none;
    animation: spinSlow 30s linear infinite;
}

.empty-state {
    position: relative;
    overflow: hidden;
}

@keyframes spinSlow {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* Subtle shine effect on cards */
.feature-card::after,
.session-card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 40%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 60%
    );
    transform: translateX(-100%);
    transition: transform 0.6s ease;
    pointer-events: none;
}

.feature-card:hover::after,
.session-card:hover::after {
    transform: translateX(100%);
}

/* Navbar subtle gradient border */
.navbar::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg,
        var(--primary-dark) 0%,
        var(--primary-color) 25%,
        var(--primary-light) 50%,
        var(--primary-color) 75%,
        var(--primary-dark) 100%
    );
    background-size: 200% 100%;
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

/* Decorative quote marks for feature cards */
.feature-card h3::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 1.2em;
    background: var(--primary-color);
    margin-right: 0.5rem;
    border-radius: 2px;
    vertical-align: middle;
}

/* ===== Enhanced Modern Styling ===== */

/* Gradient text for hero */
.hero h1 {
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 50%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Glassmorphism effect for filter container */
.filters-container {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Enhanced stat cards */
.stat-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Profile header enhancement */
.profile-header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(200, 16, 46, 0.02) 100%);
    border: 1px solid var(--border-color);
}

/* Enhanced profile avatar with ring */
.profile-avatar {
    box-shadow: 0 0 0 4px var(--bg-secondary), 0 0 0 6px var(--primary-color);
}

/* Animated gradient on nav logo */
.nav-logo {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Better link hover effects */
.auth-footer a {
    position: relative;
    transition: color 0.3s ease;
}

.auth-footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.auth-footer a:hover::after {
    width: 100%;
}

.auth-footer a:hover {
    text-decoration: none;
}

/* Module tags enhancement */
.module-tag {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    box-shadow: 0 2px 8px rgba(200, 16, 46, 0.2);
    transition: all 0.3s ease;
}

.module-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(200, 16, 46, 0.3);
}

/* Session module badge enhancement */
.session-module {
    background: linear-gradient(135deg, var(--bg-red-subtle) 0%, rgba(230, 57, 70, 0.1) 100%);
    transition: all 0.3s ease;
}

.session-module:hover {
    transform: scale(1.05);
}

/* Preference tags subtle animation */
.preference-tag {
    transition: all 0.2s ease;
}

.preference-tag:hover {
    background-color: var(--bg-red-subtle);
    color: var(--primary-color);
}

/* Enhanced empty state */
.empty-state {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 50%, rgba(200, 16, 46, 0.02) 100%);
}

/* Tabs with indicator */
.tab-btn {
    position: relative;
    transition: all 0.3s ease;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.tab-btn.active::after,
.tab-btn:hover::after {
    width: 60%;
}

/* Creator avatar enhancement */
.creator-avatar {
    transition: all 0.3s ease;
}

.session-card:hover .creator-avatar {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(200, 16, 46, 0.3);
}

/* Chat panel glassmorphism header */
.chat-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Enhanced buttons with better depth */
.btn {
    position: relative;
}

.btn-secondary {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
}

/* Form section enhancement */
.form-section {
    border: 1px solid var(--border-color);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(250, 250, 250, 0.5) 100%);
}

/* Toast notifications with better styling */
.toast {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

/* Decorative circles for auth page */
.auth-container::before {
    content: '';
    position: absolute;
    top: 10%;
    right: 5%;
    width: 150px;
    height: 150px;
    border: 2px solid rgba(200, 16, 46, 0.08);
    border-radius: 50%;
    pointer-events: none;
}

.auth-container::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 8%;
    width: 100px;
    height: 100px;
    border: 2px solid rgba(200, 16, 46, 0.05);
    border-radius: 50%;
    pointer-events: none;
}


/* Modal with glassmorphism */
.modal-content {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.95);
}

/* Page header with gradient underline on load */
.page-header::after {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--accent-color));
    background-size: 200% 100%;
    animation: gradientShift 4s ease infinite;
}

/* ===== Session Badges ===== */
.session-badges {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    align-items: flex-end;
}

.live-badge {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--danger-color) 100%);
    color: white;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 8px rgba(200, 16, 46, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Scheduled badge */
.scheduled-badge {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

/* Locked button for scheduled sessions */
.btn-locked {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, #e5e7eb 100%);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    font-weight: 500;
}

/* Scheduled countdown text */
.scheduled-countdown {
    color: #6366f1;
}

/* Chat locked scheduled state */
.chat-locked.scheduled {
    text-align: center;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.chat-locked.scheduled .lock-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.chat-locked.scheduled h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.125rem;
}

.chat-locked.scheduled p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.chat-locked.scheduled .scheduled-time {
    font-weight: 600;
    color: #6366f1;
    font-size: 1rem;
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    margin: 0.5rem 0;
}

.chat-locked.scheduled .scheduled-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

.start-now-label {
    padding: 0.75rem;
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.start-now-label:hover {
    border-color: var(--primary-color);
}

.session-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Session View Page ===== */
.session-view-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    min-height: calc(100vh - 200px);
}

.session-details-panel {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn-back {
    align-self: flex-start;
    margin-bottom: 0.5rem;
}

.session-view-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.session-view-header h2 {
    font-size: 1.5rem;
    margin: 0;
}

.session-view-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.info-row {
    display: flex;
    gap: 0.5rem;
}

.info-label {
    font-weight: 500;
    color: var(--text-secondary);
    min-width: 120px;
}

.session-description {
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
}

.session-description p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Chat Panel ===== */
.chat-panel {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
    min-height: 400px;
}

.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    font-size: 1rem;
    margin: 0;
}

.chat-status {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    background-color: #D1FAE5;
    color: #065F46;
}

.chat-status.error {
    background-color: #FEE2E2;
    color: #991B1B;
}

/* Chat Participants */
.chat-participants {
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
}

.participants-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.participant-count {
    background: var(--primary-light);
    color: white;
    padding: 0.1rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
}

.participants-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.participant-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.participant-chip:hover {
    background: var(--primary-light);
    color: white;
}

.participant-chip .chip-avatar {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.5rem;
    font-weight: 600;
}

.participant-chip.is-you {
    opacity: 0.6;
    cursor: default;
}

.participant-chip.is-you:hover {
    background: var(--bg-primary);
    color: inherit;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.chat-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
}

.chat-locked {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
}

.chat-message {
    max-width: 80%;
    align-self: flex-start;
}

.chat-message.own {
    align-self: flex-end;
}

.message-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.25rem;
}

.message-sender {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.message-time {
    font-size: 0.7rem;
    color: var(--text-light);
}

.message-content {
    background-color: var(--bg-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    word-wrap: break-word;
}

.chat-message.own .message-content {
    background-color: var(--primary-color);
    color: var(--text-white);
}

/* ===== Code Blocks in Chat ===== */
.code-block {
    background-color: #1e1e1e;
    color: #d4d4d4;
    padding: 1rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 0.5rem 0;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    position: relative;
}

.chat-message.own .code-block {
    background-color: #2d2d2d;
}

.code-block code {
    display: block;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: inherit;
}

.code-language {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.1);
    color: #4FC3F7;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    text-transform: uppercase;
}

.inline-code {
    background-color: rgba(0, 0, 0, 0.1);
    color: #e91e63;
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.85em;
}

.chat-message.own .inline-code {
    background-color: rgba(255, 255, 255, 0.2);
    color: #ffeb3b;
}

.chat-input-form {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.chat-input-form .btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.chat-input-form .btn-icon:hover {
    background-color: var(--bg-primary);
    color: var(--primary-color);
}

.chat-input-form input[type="text"] {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.chat-input-form input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.chat-input-form button[type="submit"] {
    padding: 0.75rem 1.5rem;
}

.chat-messages.drag-over {
    background-color: rgba(79, 70, 229, 0.05);
    border: 2px dashed var(--primary-color);
}

/* ===== Code Editor in Chat ===== */
.code-editor-container {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.code-editor-container.hidden {
    display: none;
}

.code-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.code-editor-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.code-editor-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s;
}

.code-editor-close:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.code-editor-input {
    width: 100%;
    min-height: 200px;
    max-height: 400px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    background-color: #f5f5f5;
    color: var(--text-primary);
    tab-size: 4;
}

.code-editor-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #fff;
}

.code-editor-footer {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-top: 0.75rem;
}

.code-language-input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.code-language-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.keyboard-hint {
    font-size: 0.75rem;
    opacity: 0.7;
    margin-left: 0.25rem;
    font-weight: normal;
}

/* ===== Image Messages in Chat ===== */
.message-image-container {
    max-width: 100%;
}

.chat-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform 0.2s;
    display: block;
}

.chat-image:hover {
    transform: scale(1.02);
}

.image-caption {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: inherit;
}

/* ===== Image Preview Modal ===== */
.image-preview-content {
    max-width: 600px;
    width: 90%;
}

.image-preview-container {
    padding: 0;
}

.image-preview-container h3 {
    margin: 0 0 1rem 0;
    padding: 1.5rem 1.5rem 0 1.5rem;
    font-size: 1.25rem;
}

.preview-image {
    max-width: 100%;
    max-height: 400px;
    display: block;
    margin: 0 auto;
    border-radius: var(--radius-md);
}

.image-preview-actions {
    padding: 1.5rem;
}

.image-caption-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    resize: vertical;
    margin-bottom: 1rem;
    font-family: inherit;
}

.image-caption-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.preview-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

/* ===== Responsive - Tablet ===== */
@media (max-width: 1024px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .hero {
        padding: 3rem 1rem 2.5rem;
    }

    .hero h1 {
        font-size: 2.75rem;
    }

    .features {
        gap: 1.5rem;
        padding: 2rem 1rem;
    }

    .session-view-container {
        gap: 1rem;
    }

    .sessions-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1rem;
    }
}

/* ===== Responsive - Mobile ===== */
@media (max-width: 768px) {
    /* Base adjustments */
    body {
        font-size: 15px;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.1rem; }

    .container {
        padding: 1rem 0.75rem;
    }

    /* Navigation */
    .nav-container {
        padding: 0.875rem 1rem;
    }

    .nav-logo {
        font-size: 1.5rem;
    }

    .logo-icon {
        font-size: 1.5rem;
    }

    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-md);
        display: none;
        border-top: 1px solid var(--border-color);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: 0.875rem 1rem;
        font-size: 1rem;
    }

    .auth-links {
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }

    .user-menu {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
        width: 100%;
    }

    .btn-logout {
        width: 100%;
        padding: 0.875rem 1rem;
    }

    /* Hero */
    .hero {
        padding: 2.5rem 1rem 2rem;
    }

    .hero h1 {
        font-size: 1.875rem;
        margin-bottom: 1rem;
    }

    .hero h1::after {
        width: 60px;
        height: 3px;
        margin: 1rem auto 0;
    }

    .hero p {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    /* Features */
    .features {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1.5rem 1rem;
    }

    .feature-card {
        padding: 1.5rem;
    }

    .feature-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }

    .feature-card h3 {
        font-size: 1.125rem;
    }

    /* Auth Forms */
    .auth-container {
        padding: 1.5rem 1rem;
        min-height: calc(100vh - 120px);
    }

    .auth-card {
        padding: 2rem 1.5rem;
        border-radius: var(--radius-lg);
    }

    .auth-card h2 {
        font-size: 1.5rem;
    }

    /* Form Elements */
    .form-row {
        grid-template-columns: 1fr;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 1rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .form-section {
        padding: 1.25rem;
        margin-bottom: 1rem;
    }

    .form-actions {
        flex-direction: column-reverse;
        gap: 0.75rem;
    }

    .form-actions .btn {
        width: 100%;
    }

    .checkbox-group {
        flex-direction: column;
        gap: 0.75rem;
    }

    .checkbox-label {
        padding: 0.5rem 0;
    }

    /* Buttons */
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        min-height: 48px; /* Touch target */
    }

    .btn-sm {
        padding: 0.625rem 1rem;
        min-height: 40px;
    }

    /* Filters */
    .filters-container {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .filter-group {
        width: 100%;
    }

    .filter-group select {
        min-width: 100%;
        padding: 0.875rem 1rem;
    }

    /* Sessions Grid */
    .sessions-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .session-card {
        padding: 1.25rem;
    }

    .session-header {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }

    .session-badges {
        align-items: flex-start;
        flex-direction: row;
        gap: 0.5rem;
    }

    .session-title {
        font-size: 1.125rem;
    }

    .session-footer {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .session-actions {
        width: 100%;
    }

    .session-actions .btn {
        flex: 1;
    }

    /* Profile */
    .profile-header {
        flex-direction: column;
        text-align: center;
        padding: 1.5rem;
        gap: 1rem;
    }

    .profile-avatar {
        width: 70px;
        height: 70px;
        font-size: 1.25rem;
    }

    .profile-info h2 {
        font-size: 1.375rem;
    }

    .profile-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }

    .stat-card {
        padding: 1rem 0.5rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    .profile-section {
        padding: 1.25rem;
    }

    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        gap: 0.25rem;
    }

    .tabs::-webkit-scrollbar {
        display: none;
    }

    .tab-btn {
        white-space: nowrap;
        padding: 0.625rem 0.875rem;
        font-size: 0.875rem;
    }

    /* Session View */
    .session-view-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .session-details-panel {
        padding: 1.25rem;
        order: 1;
    }

    .btn-back {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }

    .session-view-header h2 {
        font-size: 1.25rem;
    }

    .info-row {
        flex-direction: column;
        gap: 0.25rem;
    }

    .info-label {
        min-width: auto;
        font-size: 0.8rem;
    }

    /* Chat Panel */
    .chat-panel {
        height: 450px;
        min-height: 400px;
        order: 2;
    }

    .chat-header {
        padding: 0.875rem 1rem;
    }

    .chat-header h3 {
        font-size: 0.9rem;
    }

    .chat-participants {
        padding: 0.625rem 0.875rem;
    }

    .participant-chip {
        font-size: 0.75rem;
        padding: 0.2rem 0.4rem;
    }

    .chat-messages {
        padding: 0.75rem;
    }

    .chat-message {
        max-width: 90%;
    }

    .message-content {
        padding: 0.625rem 0.875rem;
        font-size: 0.875rem;
    }

    .chat-input-form {
        padding: 0.75rem;
        gap: 0.5rem;
    }

    .chat-input-form input[type="text"] {
        padding: 0.75rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .chat-input-form button[type="submit"] {
        padding: 0.75rem 1rem;
    }

    /* Code Editor */
    .code-editor-container {
        padding: 0.75rem;
    }

    .code-editor-input {
        min-height: 150px;
        font-size: 14px;
    }

    .code-editor-footer {
        flex-wrap: wrap;
    }

    .code-language-input {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    /* Modals */
    .modal-content {
        padding: 1.5rem;
        width: 95%;
        max-width: 380px;
    }

    .modal-user-header {
        flex-direction: column;
        text-align: center;
    }

    .star-rating .star {
        font-size: 1.75rem;
    }

    /* Toast */
    .toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }

    .toast {
        width: 100%;
    }

    /* Pending Requests */
    .request-item {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .request-actions {
        width: 100%;
    }

    .request-actions .btn {
        flex: 1;
    }

    /* Page Header */
    .page-header {
        margin-bottom: 1.5rem;
    }

    .page-header h2 {
        font-size: 1.5rem;
    }

    /* User Profile View */
    .user-profile-view .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .profile-actions {
        width: 100%;
        justify-content: center;
    }

    /* Empty State */
    .empty-state {
        padding: 2rem 1rem;
    }

    .empty-icon {
        font-size: 2.5rem;
    }
}

/* ===== Small Mobile ===== */
@media (max-width: 375px) {
    .container {
        padding: 0.75rem 0.5rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .auth-card {
        padding: 1.5rem 1rem;
    }

    .profile-stats {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .stat-card {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .tabs {
        flex-wrap: nowrap;
    }

    .tab-btn {
        font-size: 0.75rem;
        padding: 0.5rem 0.625rem;
    }
}

/* ===== Landscape Mobile ===== */
@media (max-width: 768px) and (orientation: landscape) {
    .hero {
        padding: 1.5rem 1rem;
    }

    .hero h1 {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }

    .hero p {
        margin-bottom: 1rem;
    }

    .auth-container {
        min-height: auto;
        padding: 1rem;
    }

    .chat-panel {
        height: 300px;
        min-height: 250px;
    }
}

/* ===== Safe Area Support (for notched devices) ===== */
@supports (padding: max(0px)) {
    .navbar {
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
    }

    .container {
        padding-left: max(0.75rem, env(safe-area-inset-left));
        padding-right: max(0.75rem, env(safe-area-inset-right));
    }

    .toast-container {
        bottom: max(1rem, env(safe-area-inset-bottom));
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Pending Requests Section ===== */
.pending-requests-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.pending-requests-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.request-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
}

.request-user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.request-user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.request-user-details {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.request-actions {
    display: flex;
    gap: 0.5rem;
}

.request-actions .btn {
    padding: 0.5rem 1rem;
}

/* ===== Profile Pending Requests Tab ===== */
.pending-session-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
}

.pending-session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.pending-session-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.25rem 0;
}

.pending-session-module {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
}

.pending-count {
    background: var(--warning);
    color: #000;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

.pending-requests-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.loading-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

/* ===== Blocked Users Tab ===== */
.blocked-user-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
}

.blocked-user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.blocked-user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.blocked-user-details {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===== User Profile View Page ===== */
.profile-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.user-profile-view .profile-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.user-profile-view .profile-header .profile-actions {
    margin-left: auto;
}

/* ===== User Profile Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-user-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.modal-user-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 1.25rem;
}

.modal-user-info h3 {
    margin: 0 0 0.25rem 0;
    color: var(--text-primary);
}

.modal-user-info p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.modal-user-rating {
    text-align: center;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.rating-display {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

#modalUserStars {
    font-size: 1.5rem;
    color: #f59e0b;
}

#modalUserRating {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.modal-rating-section {
    text-align: center;
}

.modal-rating-section h4 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
}

.star-rating {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.star-rating .star {
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.star-rating .star:hover,
.star-rating .star.active {
    color: #f59e0b;
}

.star-rating .star.hovered {
    color: #f59e0b;
}

/* Clickable chat username */
.message-sender.clickable {
    cursor: pointer;
    color: var(--primary);
}

.message-sender.clickable:hover {
    text-decoration: underline;
}

.modal-actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.modal-actions .btn {
    width: 100%;
}

/* ===== User Profile View Page ===== */
.user-profile-view {
    margin-top: 2rem;
}

.user-profile-view .profile-header {
    margin-bottom: 2rem;
}

.user-profile-view .profile-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.user-profile-view .profile-rating span:first-child {
    color: #f59e0b;
    font-size: 1.1rem;
}

.user-profile-view .profile-rating span:last-child {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.user-profile-view .sessions-grid {
    margin-top: 2rem;
}

.user-profile-view .sessions-grid h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}