/* ===================================
   CSS Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --brand-teal: #2B9B9E;
    --brand-teal-dark: #238285;
    --brand-teal-light: #3FB5B8;
    --brand-teal-pale: #E6F7F7;
    --brand-blue-dark: #1e293b;

    /* Theme Variables (Light Mode Default) */
    --bg-body: #ffffff;
    --bg-card: #ffffff;
    --bg-off-white: #f8f9fa;
    --bg-header: rgba(255, 255, 255, 0.95);
    --bg-footer: #343a40;
    --text-main: #343a40;
    --text-muted: #6c757d;
    --text-light: #e9ecef;
    --border-color: #e9ecef;
    --shadow-color: rgba(43, 155, 158, 0.12);

    /* Other Variables */
    --accent-coral: #E76F51;
    --accent-gold: #F4A261;

    /* Neutral Colors (Legacy support, prefer Theme Variables) */
    --white: #ffffff;
    --off-white: #f8f9fa;
    --light-gray: #e9ecef;
    --gray: #6c757d;
    --dark-gray: #343a40;
    --black: #1a1a1a;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #5b799c 0%, #7a9bc4 100%);
    --gradient-hero: linear-gradient(135deg, #4a6380 0%, #5b799c 50%, #7a9bc4 100%);
    --gradient-teal: linear-gradient(135deg, var(--brand-teal) 0%, var(--brand-teal-dark) 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(43, 155, 158, 0.05) 0%, rgba(43, 155, 158, 0.15) 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(43, 155, 158, 0.08);
    --shadow-md: 0 4px 16px rgba(43, 155, 158, 0.12);
    --shadow-lg: 0 8px 32px rgba(43, 155, 158, 0.16);
    --shadow-xl: 0 16px 48px rgba(43, 155, 158, 0.2);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    --bg-body: #121212;
    --bg-card: #1e1e1e;
    --bg-off-white: #18181b;
    --bg-header: rgba(18, 18, 18, 0.95);
    --bg-footer: #0f0f10;
    --text-main: #e2e8f0;
    --text-muted: #a0aec0;
    --text-light: #e2e8f0;
    /* Footer text in dark mode */
    --border-color: #2d3748;
    --shadow-color: rgba(0, 0, 0, 0.3);

    --brand-blue-dark: #e2e8f0;
    /* Make dark text headers light in dark mode */
}

/* Enhanced Logo Sharpness */
/* Enhanced Logo Sharpness */
.logo,
.auth-logo,
.dashboard-logo {
    image-rendering: -webkit-optimize-contrast;
    /* Chrome/Edge specific */
    filter: contrast(1.05);
    /* Slight contrast boost to define edges */
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-body);
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===================================
   Typography
   =================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    color: var(--text-main);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--brand-teal);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--brand-teal-dark);
}

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-3xl) 0;
    scroll-margin-top: 100px;
    /* Accounts for sticky header */
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    color: var(--brand-teal);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Header & Navigation
   =================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    z-index: 1000;
    background: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ===================================
   Notification Banner
   =================================== */

.notification-banner {
    padding: 10px 15px;
    color: var(--white);
    font-weight: 500;
    font-size: 0.95rem;
    z-index: 1001;
    position: relative;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.banner-blue {
    background-color: #2563eb;
}

.banner-red {
    background-color: #dc2626;
}

.banner-green {
    background-color: #16a34a;
}

.banner-yellow {
    background-color: #ca8a04;
    color: #fff;
}

.banner-gray {
    background-color: #4b5563;
}

.notification-banner a {
    color: white;
    text-decoration: underline;
    font-weight: 600;
}

.notification-banner a:hover {
    color: rgba(255, 255, 255, 0.8);
}


.logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    text-decoration: none;
}

.logo-icon {
    height: 50px;
    width: auto;
    object-fit: contain;
    display: block;
}

.logo {
    height: 40px;
    width: auto;
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.05);
}

.brand-name {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--brand-teal);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-left: var(--spacing-sm);
    border-left: 1px solid var(--border-color);
}

.nav-social-link {
    font-size: 1.25rem;
    color: var(--text-main);
    transition: color var(--transition-fast);
}

.nav-social-link:hover {
    color: var(--brand-teal);
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.25rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--brand-teal);
    transform: rotate(15deg);
}

.nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--text-main);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--brand-teal);
}

.nav-link:hover::after {
    width: 80%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background: var(--brand-teal);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-3xl) var(--spacing-md);
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(35, 130, 133, 0.85) 0%, rgba(43, 155, 158, 0.75) 50%, rgba(63, 181, 184, 0.85) 100%);
    z-index: -2;
}

.hero-background::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    /* Feint black overlay */
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.hero-title-main {
    display: block;
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: var(--font-weight-extrabold);
    color: var(--white);
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.hero-title-sub {
    display: block;
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: var(--font-weight-medium);
    color: rgba(255, 255, 255, 0.95);
    letter-spacing: 0.1em;
}

.hero-description {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

.scroll-text {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid rgba(255, 255, 255, 0.8);
    border-bottom: 2px solid rgba(255, 255, 255, 0.8);
    transform: rotate(45deg);
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--white);
    color: var(--brand-teal);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--brand-teal-pale);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--brand-teal);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--brand-teal);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-icon {
    font-size: 1.25rem;
}

/* ===================================
   About Section
   =================================== */

.about {
    background: var(--bg-body);
}

.about-image-container {
    max-width: 1000px;
    margin: 0 auto var(--spacing-2xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-slow);
}

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

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.about-card {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    text-align: center;
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.course-image-container {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.course-image {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-slow);
}

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

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.about-card h3 {
    color: var(--brand-teal);
    margin-bottom: var(--spacing-sm);
}

.about-card p {
    color: var(--text-muted);
    line-height: 1.8;
}

/* ===================================
   Courses Section
   =================================== */

.courses {
    background: var(--bg-body);
}

.courses-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.course-info-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    border-top: 6px solid var(--brand-teal);
}

.course-info-header {
    background: var(--bg-off-white);
    padding: var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.course-info-header h3 {
    color: var(--brand-teal);
    margin: 0;
}

.course-info-body {
    padding: var(--spacing-xl);
}

.course-info-text {
    color: var(--text-muted);
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.course-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.course-highlights {
    background: var(--brand-teal-pale);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.course-highlights h4 {
    color: var(--brand-teal);
    margin-bottom: var(--spacing-md);
}

.highlights-list {
    list-style: none;
}

.highlights-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-main);
}

/* ===================================
   Course Layout (Featured + Table)
   =================================== */

.featured-course-container {
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

.timetable-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.course-timetable {
    width: 100%;
    border-collapse: collapse;
}

.course-timetable th,
.course-timetable td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.course-timetable th {
    background: var(--bg-off-white);
    font-weight: var(--font-weight-semibold);
    color: var(--brand-teal);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.course-timetable tr:last-child td {
    border-bottom: none;
}

.course-timetable tr:hover {
    background: rgba(43, 155, 158, 0.1);
}

.course-date {
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
}

.course-title {
    font-weight: var(--font-weight-bold);
    color: var(--brand-blue-dark);
}

/* Mobile Timetable Styles */
@media (max-width: 768px) {
    .timetable-container {
        background: transparent;
        border: none;
        box-shadow: none;
        border-radius: 0;
        overflow: visible;
    }

    .course-timetable thead {
        display: none;
    }

    .course-timetable,
    .course-timetable tbody,
    .course-timetable tr,
    .course-timetable td {
        display: block;
        width: 100%;
    }

    .course-timetable tr {
        margin-bottom: var(--spacing-md);
        border: 1px solid var(--light-gray);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-sm);
        padding: var(--spacing-sm);
    }

    .course-timetable td {
        padding: var(--spacing-xs) var(--spacing-sm);
        border-bottom: none;
        text-align: right;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .course-timetable td::before {
        content: attr(data-label);
        float: left;
        font-weight: var(--font-weight-bold);
        color: var(--gray);
        font-size: 0.85rem;
    }

    .course-timetable td:last-child {
        margin-top: var(--spacing-sm);
        border-top: 1px solid var(--light-gray);
        padding-top: var(--spacing-sm);
        justify-content: center;
    }

    .course-timetable td:last-child::before {
        display: none;
    }

    .course-timetable .btn {
        width: 100%;
        justify-content: center;
    }
}

/* ===================================
   Schedule Pagination
   =================================== */

.schedule-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.schedule-pagination .pagination-info {
    font-size: 0.9rem;
    color: var(--text-muted);
    min-width: 80px;
    text-align: center;
}

.schedule-pagination .btn-page {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-family: var(--font-primary);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.schedule-pagination .btn-page:hover:not(:disabled) {
    background: var(--brand-teal);
    border-color: var(--brand-teal);
    color: var(--white);
}

.schedule-pagination .btn-page:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* ===================================
   FAQ Section
   =================================== */

.faq {
    background: var(--bg-off-white);
}

.faq-content {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-main);
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--brand-teal);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--brand-teal);
    transition: transform var(--transition-base);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--gray);
    line-height: 1.8;
}

.faq-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--gradient-overlay);
    border-radius: var(--radius-lg);
}

.faq-cta p {
    font-size: 1.25rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-main);
    margin-bottom: var(--spacing-md);
}

/* ===================================
   Contact Section
   =================================== */

.contact {
    background: var(--bg-body);
}

/* ===================================
   Contact Form
   =================================== */

.contact-form-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: var(--font-weight-medium);
    color: var(--text-main);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-body);
    color: var(--text-main);
    transition: border-color var(--transition-fast);
    font-family: var(--font-primary);
    font-size: 1rem;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--brand-teal);
    box-shadow: 0 0 0 3px rgba(43, 155, 158, 0.2);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.contact-submit-btn {
    width: 100%;
    justify-content: center;
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--dark-gray);
    color: var(--light-gray);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* CSS Rebuilt Logo */
.footer-logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    margin-bottom: var(--spacing-sm);
}

.footer-logo-icon {
    font-size: 2.5rem;
    color: var(--brand-teal);
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    line-height: 1;
}

.logo-saturn {
    font-size: 1.5rem;
    font-weight: var(--font-weight-extrabold);
    color: var(--brand-teal);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.logo-defence {
    font-size: 0.9rem;
    font-weight: var(--font-weight-bold);
    color: var(--white);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.footer-tagline {
    color: var(--light-gray);
    font-size: 0.875rem;
}

.footer-links h4,
.footer-social h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--light-gray);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--brand-teal-light);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    font-size: 1.5rem;
    color: var(--light-gray);
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--brand-teal-light);
    transform: scale(1.2);
}

.social-link:hover {
    transform: scale(1.2);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--gray);
    font-size: 0.875rem;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    .nav-menu {
        position: absolute;
        /* Changed from fixed to absolute to anchor to header */
        top: 100%;
        /* Align exactly to bottom of header */
        left: -100%;
        width: 100%;
        flex-direction: column;
        background: var(--bg-card);
        backdrop-filter: blur(12px);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--border-color);
    }

    .nav-actions {
        border-left: none;
        /* Fix: Remove divider in mobile */
        padding-left: 0;
        margin-top: var(--spacing-md);
        justify-content: center;
        width: 100%;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .brand-name {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .course-actions {
        flex-direction: column;
    }

    /* Hide theme toggle on auth pages */
    .auth-container #theme-toggle {
        display: none !important;
    }

    section {
        padding: var(--spacing-2xl) 0;
    }
}

@media (max-width: 480px) {
    .logo {
        height: 32px;
    }

    /* Fix gap: Header is smaller, but absolute positioning handles it automatically now */
    /* .nav-menu { top: 64px; } - Removed */

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Utility Classes
   =================================== */

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}


/* ===================================
   Auth Pages (Login/Register)
   =================================== */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
    /* Background handled by hero-background div */
}

.auth-card {
    background: var(--bg-card);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 450px;
    width: 100%;
    border: 1px solid var(--border-color);
}

.bg-card-glass {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.7);
}

[data-theme='dark'] .bg-card-glass {
    background: rgba(15, 35, 35, 0.85);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ===================================
   Form Grid Layout & Compact Card
   =================================== */

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Compact variation for registration */
.auth-card.compact {
    padding: var(--spacing-lg);
    max-width: 700px;
}

.auth-card.compact .auth-header {
    margin-bottom: var(--spacing-lg);
}

.auth-card.compact .form-group {
    margin-bottom: var(--spacing-sm);
}

.auth-card.compact .auth-footer {
    margin-top: var(--spacing-md);
}

/* ===================================
   Featured Instructor Section
   =================================== */

.instructor-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    align-items: center;
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.instructor-image-wrapper {
    width: 100%;
    max-width: 200px;
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    aspect-ratio: 3/4;
    /* Protrait aspect ratio */
}

.instructor-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.instructor-image-wrapper:hover .instructor-image {
    transform: scale(1.03);
}

.instructor-details {
    padding-right: 0;
    max-width: 700px;
}

.instructor-title {
    font-size: 0.9rem;
    color: var(--brand-teal);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.instructor-name {
    font-size: 2rem;
    color: var(--brand-blue-dark);
    margin-bottom: 0.25rem;
    line-height: 1.1;
}

.instructor-role {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.instructor-bio {
    color: var(--text-main);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    font-size: 1rem;
}

.instructor-bio p {
    margin-bottom: 1rem;
}

.instructor-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.skill-tag {
    background: var(--brand-teal-pale);
    color: var(--brand-teal-dark);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* ===================================
   Back to Top Button
   =================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background: var(--brand-teal);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
    font-size: 1.2rem;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--brand-teal-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    color: white;
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .instructor-container {
        padding: var(--spacing-xl);
    }

    .instructor-image-wrapper {
        max-width: 200px;
        margin: 0 auto;
    }
}

.instructor-skills {
    justify-content: center;
}