/* ==========================================================================
   DEOLITE EDUCATION SERVICE - STYLING DESIGN SYSTEM (VANILLA CSS)
   ========================================================================== */

/* --- CSS Variables & Design System Tokens --- */
:root {
    /* Fonts */
    --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Theme Colors (Light Theme Default) */
    --bg-dark: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-card-hover: rgba(255, 255, 255, 0.9);
    --border-color: rgba(15, 23, 42, 0.08);
    --border-hover: rgba(99, 102, 241, 0.4);

    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    /* Accent & Brand Colors (Light-adapted Vibrancy & High Contrast) */
    --primary: #4338ca;         /* Darker Indigo */
    --primary-glow: rgba(67, 56, 202, 0.2);
    --secondary: #0e7490;       /* Darker Cyan */
    --secondary-glow: rgba(14, 116, 144, 0.2);
    --accent-purple: #6d28d9;   /* Darker Violet */
    --accent-emerald: #047857;  /* Darker Emerald */
    --accent-emerald-glow: rgba(4, 120, 87, 0.15);
    --accent-rose: #be123c;     /* Darker Rose */
    --accent-rose-glow: rgba(190, 18, 60, 0.15);

    /* Difficulty colors */
    --color-diff-easy: #047857;
    --color-diff-medium: #b45309;
    --color-diff-hard: #b91c1c;

    /* Hero badge colors */
    --bg-hero-badge: rgba(67, 56, 202, 0.08);
    --border-hero-badge: rgba(67, 56, 202, 0.2);
    --color-hero-badge: #4338ca;

    /* Quiz badge colors */
    --bg-quiz-badge: rgba(14, 116, 144, 0.08);
    --border-quiz-badge: rgba(14, 116, 144, 0.2);
    --color-quiz-badge: #0e7490;

    /* Live indicator colors */
    --bg-live-indicator: rgba(190, 18, 60, 0.08);
    --border-live-indicator: rgba(190, 18, 60, 0.2);
    --color-live-indicator: #be123c;

    /* UI Sub-components */
    --bg-header: rgba(248, 250, 252, 0.8);
    --bg-header-scroll: rgba(248, 250, 252, 0.95);
    --header-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
    --bg-mobile-menu: #ffffff;
    --bg-db-box: rgba(15, 23, 42, 0.03);
    --bg-db-box-alt: rgba(15, 23, 42, 0.05);
    --bg-footer: #f1f5f9;
    --bg-form-input: rgba(255, 255, 255, 0.9);
    --bg-success-overlay: #ffffff;
    --bg-btn-secondary: rgba(15, 23, 42, 0.04);
    --bg-btn-secondary-hover: rgba(15, 23, 42, 0.08);
    --bg-btn-card: rgba(15, 23, 42, 0.02);

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #4338ca 0%, #6d28d9 50%, #0e7490 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0.3) 100%);
    --gradient-button: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);

    /* Constants */
    --container-max-width: 1240px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --glass-blur: blur(16px);
    --card-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.08);
    --blob-opacity: 0.07;
}

/* Theme Override (Dark Theme) */
[data-theme="dark"] {
    --bg-dark: #09090b;
    --bg-card: rgba(18, 18, 22, 0.65);
    --bg-card-hover: rgba(26, 26, 32, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(99, 102, 241, 0.4);

    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --primary: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.5);
    --secondary: #06b6d4;
    --secondary-glow: rgba(6, 182, 212, 0.4);
    --accent-purple: #8b5cf6;
    --accent-emerald: #10b981;
    --accent-emerald-glow: rgba(16, 185, 129, 0.3);
    --accent-rose: #f43f5e;
    --accent-rose-glow: rgba(244, 63, 94, 0.3);

    /* Difficulty colors */
    --color-diff-easy: #86efac;
    --color-diff-medium: #fde047;
    --color-diff-hard: #fca5a5;

    /* Hero badge colors */
    --bg-hero-badge: rgba(99, 102, 241, 0.12);
    --border-hero-badge: rgba(99, 102, 241, 0.25);
    --color-hero-badge: #a5b4fc;

    /* Quiz badge colors */
    --bg-quiz-badge: rgba(6, 182, 212, 0.12);
    --border-quiz-badge: rgba(6, 182, 212, 0.25);
    --color-quiz-badge: #22d3ee;

    /* Live indicator colors */
    --bg-live-indicator: rgba(244, 63, 94, 0.15);
    --border-live-indicator: rgba(244, 63, 94, 0.3);
    --color-live-indicator: #fda4af;

    --bg-header: rgba(9, 9, 11, 0.8);
    --bg-header-scroll: rgba(9, 9, 11, 0.95);
    --header-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    --bg-mobile-menu: #0d0d11;
    --bg-db-box: rgba(255, 255, 255, 0.02);
    --bg-db-box-alt: rgba(255, 255, 255, 0.03);
    --bg-footer: #050507;
    --bg-form-input: rgba(9, 9, 11, 0.6);
    --bg-success-overlay: #121214;
    --bg-btn-secondary: rgba(255, 255, 255, 0.05);
    --bg-btn-secondary-hover: rgba(255, 255, 255, 0.1);
    --bg-btn-card: rgba(255, 255, 255, 0.03);

    --gradient-hero: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
    --gradient-button: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.7);
    --blob-opacity: 0.15;
}

/* --- Global Resets & Base Styles --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

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

button, input, select, textarea {
    font-family: inherit;
    outline: none;
}

/* --- Background Ambient Glow Blobs --- */
.bg-blobs-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}
.blob {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: var(--blob-opacity);
    z-index: -1;
    pointer-events: none;
    transition: var(--transition-slow);
}
.blob-1 {
    top: -100px;
    right: -100px;
    background-color: var(--primary);
}
.blob-2 {
    top: 50%;
    left: -150px;
    background-color: var(--secondary);
}
.blob-3 {
    bottom: -100px;
    right: 10%;
    background-color: var(--accent-purple);
}

/* --- Layout & Utility Classes --- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.text-center { text-align: center; }
.hidden { display: none !important; }
.accent-text { color: var(--secondary); }
.gradient-text {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    margin-bottom: 60px;
    max-width: 700px;
}
.section-header.text-center {
    margin-left: auto;
    margin-right: auto;
}
.section-tagline {
    font-family: var(--font-heading);
    text-transform: uppercase;
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    color: var(--secondary);
    display: inline-block;
    margin-bottom: 12px;
}
.section-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 16px;
}
.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* --- Interactive Glassmorphism Card Style --- */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    transition: border-color var(--transition-normal), background-color var(--transition-normal), transform var(--transition-normal);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-normal);
    border: none;
}
.btn-primary {
    background: var(--gradient-button);
    color: #ffffff;
    box-shadow: 0 4px 20px var(--primary-glow);
}
.btn-primary:hover {
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.7);
    transform: translateY(-2px);
}
.btn-secondary {
    background: var(--bg-btn-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background: var(--bg-btn-secondary-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}
.btn-block {
    width: 100%;
}
.icon-play {
    margin-right: 8px;
    display: flex;
    align-items: center;
}

/* ==========================================================================
   COMPONENT STYLING
   ========================================================================== */

/* --- Header & Navbar --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--bg-header);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}
.header.scrolled {
    padding: 0;
    background: var(--bg-header-scroll);
    box-shadow: var(--header-shadow);
}
.header.scrolled .navbar {
    height: 60px;
}
.header.scrolled .logo-img {
    height: 44px;
}

/* --- Theme Toggle Button --- */
.theme-toggle {
    background: rgba(15, 23, 42, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}
[data-theme="dark"] .theme-toggle {
    background: rgba(255, 255, 255, 0.03);
}
.theme-toggle:hover {
    background: rgba(15, 23, 42, 0.08);
    border-color: var(--border-hover);
    transform: scale(1.05);
}
[data-theme="dark"] .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}
.theme-toggle svg {
    transition: transform var(--transition-normal);
}
.theme-toggle:active svg {
    transform: rotate(45deg);
}

/* Icon toggles based on theme state */
.theme-toggle .sun-icon { display: none; }
.theme-toggle .moon-icon { display: block; }

[data-theme="dark"] .theme-toggle .sun-icon { display: block; }
[data-theme="dark"] .theme-toggle .moon-icon { display: none; }
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 90px;
    transition: height var(--transition-normal);
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-img {
    height: 72px;
    width: auto;
    object-fit: contain;
    transition: filter 0.3s ease, transform 0.3s ease, height var(--transition-normal);
}
.logo-img:hover {
    transform: scale(1.02);
}
[data-theme="dark"] .logo-img {
    filter: invert(1) hue-rotate(180deg) brightness(1.1);
}
.contact-link {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}
.contact-link:hover {
    color: var(--primary);
    text-decoration: underline;
}
.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-button);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.4rem;
    color: #ffffff;
    box-shadow: 0 4px 15px var(--primary-glow);
}
.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.nav-menu {
    display: flex;
    gap: 32px;
    align-items: center;
}
.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}
.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary);
    transition: var(--transition-normal);
}
.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}
.cta-button {
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9rem;
    background: var(--gradient-button);
    color: #ffffff;
    box-shadow: 0 4px 10px var(--primary-glow);
    border: none;
    cursor: pointer;
}
.cta-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 15px rgba(99, 102, 241, 0.6);
}
.mobile-cta { display: none; }

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
}
.mobile-menu-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-normal);
}

/* --- Hero Section --- */
.hero-section {
    padding: 150px 0 100px 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}
.badge-container {
    margin-bottom: 24px;
}
.hero-badge {
    background: var(--bg-hero-badge);
    border: 1px solid var(--border-hero-badge);
    color: var(--color-hero-badge);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.hero-title {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: 24px;
}
.hero-description {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 40px;
    max-width: 580px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
}
.stat-item .stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}
.stat-item .stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.hero-stats .divider {
    width: 1px;
    height: 40px;
    background-color: var(--border-color);
}

/* --- Hero Interactive Dashboard Mockup --- */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
}
.visual-wrapper {
    position: relative;
    width: 100%;
    max-width: 480px;
    height: auto;
    aspect-ratio: 4 / 3;
}
.main-card {
    width: 100%;
    padding: 24px;
    position: relative;
    z-index: 2;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
    margin-bottom: 20px;
}
.student-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}
.student-profile .avatar {
    width: 42px;
    height: 42px;
    background: var(--bg-db-box);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}
.student-name {
    font-size: 0.95rem;
    font-weight: 600;
}
.student-target {
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.status-indicator {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
}
.status-indicator.live {
    background: var(--bg-live-indicator);
    color: var(--color-live-indicator);
    border: 1px solid var(--border-live-indicator);
    animation: pulse 1.5s infinite;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 16px;
    margin-bottom: 20px;
}
.db-box {
    background: var(--bg-db-box);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px;
}
.db-box-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.db-box-val {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.progress-bar-container {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 4px;
}
.progress-bar-fill {
    height: 100%;
    background: var(--gradient-button);
    border-radius: 3px;
    transition: width 1s ease-in-out;
}
.db-box-sub {
    font-size: 0.7rem;
    color: var(--accent-emerald);
}

.streak-dots {
    display: flex;
    gap: 4px;
    align-items: center;
}
.streak-dots .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border-color);
}
.streak-dots .dot.active {
    background: var(--secondary);
    box-shadow: 0 0 8px var(--secondary);
}

.live-class-topic {
    background: var(--bg-db-box-alt);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.topic-icon {
    font-size: 1.4rem;
}
.topic-details h5 {
    font-size: 0.85rem;
    font-weight: 600;
}
.topic-details p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.join-btn {
    margin-left: auto;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.75rem;
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
}
.join-btn:hover {
    background: var(--secondary);
    transform: scale(1.05);
}

/* Floating overlay cards */
.floating-card {
    position: absolute;
    padding: 12px 18px;
    z-index: 3;
    font-size: 0.8rem;
    font-weight: 600;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
}
.card-top {
    top: -15px;
    right: -20px;
    border-color: rgba(99, 102, 241, 0.2);
    animation: float 5s ease-in-out infinite;
}
.card-bottom {
    bottom: -15px;
    left: -20px;
    border-color: rgba(6, 182, 212, 0.2);
    animation: float 6s ease-in-out infinite 0.5s;
}

.flex-align {
    display: flex;
    align-items: center;
    gap: 8px;
}
.pulse-icon {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 10px var(--primary);
}
.check-icon {
    color: var(--accent-emerald);
    font-weight: bold;
}

/* --- Course Explorer Section --- */
.courses-section {
    background-color: transparent;
}
.tab-container {
    width: 100%;
}
.tabs {
    display: flex;
    justify-content: center;
    background: var(--bg-db-box);
    border: 1px solid var(--border-color);
    padding: 6px;
    border-radius: 100px;
    width: max-content;
    margin: 0 auto 50px auto;
}
.tab-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 12px 28px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-normal);
}
.tab-btn:hover {
    color: var(--text-primary);
}
.tab-btn.active {
    background: var(--gradient-button);
    color: #ffffff;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}
.tab-content.active {
    display: block;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.course-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    transition: var(--transition-normal);
}
.course-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-hover);
    box-shadow: var(--card-shadow);
}
.course-card.popular {
    border-color: rgba(6, 182, 212, 0.3);
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.05) 0%, var(--bg-card) 50%);
}
.course-card.popular:hover {
    border-color: var(--secondary);
    box-shadow: 0 15px 40px rgba(6, 182, 212, 0.15);
}

.card-badge {
    background: var(--bg-btn-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    width: max-content;
    margin-bottom: 20px;
}
.popular-badge {
    position: absolute;
    top: -12px;
    right: 32px;
    background: var(--secondary);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 10px var(--secondary-glow);
}

.course-title {
    font-size: 1.4rem;
    line-height: 1.3;
    margin-bottom: 16px;
    font-weight: 700;
}
.course-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
    flex-grow: 1;
}

.course-features {
    list-style: none;
    margin-bottom: 32px;
}
.course-features li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}
.course-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--secondary);
}

.btn-card {
    background: var(--bg-btn-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 10px;
    font-weight: 600;
    text-align: center;
    width: 100%;
    display: block;
    transition: var(--transition-normal);
}
.course-card:hover .btn-card {
    background: var(--gradient-button);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 12px var(--primary-glow);
}
.course-card.popular .btn-card {
    background: var(--secondary);
    color: #ffffff;
    border-color: transparent;
}
.course-card.popular:hover .btn-card {
    background: var(--text-primary);
    color: var(--bg-dark);
    box-shadow: 0 4px 15px var(--border-hover);
}

/* --- Features Section --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.feature-item-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 20px;
    transition: var(--transition-normal);
}
.feature-item-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}
.feature-icon-wrapper {
    width: 50px;
    height: 50px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--primary);
}
.feature-item-card:nth-child(2) .feature-icon-wrapper {
    background: rgba(6, 182, 212, 0.08);
    border-color: rgba(6, 182, 212, 0.2);
    color: var(--secondary);
}
.feature-item-card:nth-child(3) .feature-icon-wrapper {
    background: rgba(16, 185, 129, 0.08);
    border-color: rgba(16, 185, 129, 0.2);
    color: var(--accent-emerald);
}
.feature-item-card:nth-child(4) .feature-icon-wrapper {
    background: rgba(139, 92, 246, 0.08);
    border-color: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
}
.feature-svg {
    stroke-width: 2px;
}
.feature-card-title {
    font-size: 1.2rem;
    margin-bottom: 12px;
}
.feature-card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* --- Interactive Quiz Section --- */
.quiz-section {
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.03), transparent 60%);
}
.quiz-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 60px;
    border-radius: 30px;
    box-shadow: var(--card-shadow);
}
.quiz-grid {
    display: grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 60px;
    align-items: center;
}
.quiz-badge {
    background: var(--bg-quiz-badge);
    border: 1px solid var(--border-quiz-badge);
    color: var(--color-quiz-badge);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 20px;
}
.quiz-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}
.quiz-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 32px;
}
.quiz-stats-mini {
    display: flex;
    gap: 24px;
}
.q-stat {
    background: var(--bg-db-box);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: 12px;
    text-align: center;
    flex-grow: 1;
}
.q-stat span {
    font-family: var(--font-heading);
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}
.q-stat label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.quiz-box {
    padding: 32px;
    border-color: var(--border-color);
}
.quiz-nav {
    display: flex;
    background: var(--bg-db-box-alt);
    border: 1px solid var(--border-color);
    padding: 4px;
    border-radius: 100px;
    margin-bottom: 24px;
}
.qn-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 10px;
    flex-grow: 1;
    font-weight: 600;
    font-size: 0.85rem;
    border-radius: 100px;
    cursor: pointer;
    transition: var(--transition-fast);
}
.qn-btn:hover { color: var(--text-primary); }
.qn-btn.active {
    background: var(--bg-dark);
    color: var(--text-primary);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.quiz-question-block {
    display: none;
}
.quiz-question-block.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.q-subject-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--secondary);
}
.q-difficulty {
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--bg-db-box);
    border: 1px solid var(--border-color);
    padding: 3px 8px;
    border-radius: 4px;
    color: var(--color-diff-medium);
}
#q-chemistry .q-difficulty { color: var(--color-diff-easy); }
#q-physics .q-difficulty { color: var(--color-diff-medium); }
#q-maths .q-difficulty { color: var(--color-diff-hard); }

.question-text {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 24px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}
.quiz-option {
    background: var(--bg-btn-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 20px;
    text-align: left;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    width: 100%;
}
.quiz-option:hover {
    background: var(--bg-db-box-alt);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

/* Correct/Incorrect option styling applied dynamically */
.quiz-option.correct {
    background: var(--accent-emerald) !important;
    border-color: var(--accent-emerald) !important;
    color: #ffffff !important;
    box-shadow: 0 0 15px var(--accent-emerald-glow);
}
.quiz-option.incorrect {
    background: var(--accent-rose) !important;
    border-color: var(--accent-rose) !important;
    color: #ffffff !important;
    box-shadow: 0 0 15px var(--accent-rose-glow);
}
.quiz-option:disabled {
    cursor: not-allowed;
}

.quiz-feedback-box {
    background: var(--bg-db-box);
    border-left: 3px solid var(--secondary);
    padding: 16px;
    border-radius: 4px 12px 12px 4px;
    margin-top: 20px;
    animation: slideUp 0.3s ease;
}
.feedback-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 6px;
}
.feedback-title.correct-text { color: var(--accent-emerald); }
.feedback-title.incorrect-text { color: var(--accent-rose); }
.feedback-explain {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* --- JEE Main 2026 Results Section --- */
.results-section {
    background: radial-gradient(circle at bottom left, rgba(139, 92, 246, 0.03), transparent 60%);
}
.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}
.result-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2px; /* outer padding for custom border-image overlay */
    overflow: hidden;
    transition: var(--transition-normal);
}
.result-card.elite {
    background: linear-gradient(135deg, rgba(191, 149, 63, 0.05) 0%, var(--bg-card) 100%);
    border: none;
    position: relative;
}
.result-card.elite::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 20px;
    padding: 1.5px; /* Border thickness */
    background: linear-gradient(135deg, #bf953f 0%, #fcf6ba 25%, #b38728 50%, #fbf5b7 75%, #aa771c 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}
.card-inner {
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border-radius: 18px;
    height: 100%;
    background: transparent;
}
.result-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow);
}
.result-card.elite:hover {
    box-shadow: 0 15px 35px rgba(191, 149, 63, 0.15);
}
.result-avatar-wrapper {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 20px;
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: var(--transition-normal);
}
.result-card.elite .result-avatar-wrapper {
    border-color: #bf953f;
    box-shadow: 0 4px 15px rgba(170, 119, 28, 0.2);
}
.result-card:hover .result-avatar-wrapper {
    transform: scale(1.05);
}
.result-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.result-name {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.result-details {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 24px;
    background: var(--bg-db-box);
    padding: 12px 24px;
    border-radius: 12px;
    width: 100%;
    border: 1px solid var(--border-color);
}
.result-card.elite .result-details {
    border-color: rgba(191, 149, 63, 0.15);
}
.result-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}
.result-value {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--secondary);
    line-height: 1.1;
}
.result-card.elite .result-value {
    background: linear-gradient(135deg, #bf953f 0%, #aa771c 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.result-tag {
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--bg-btn-secondary);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.result-card.elite .result-tag {
    background: rgba(191, 149, 63, 0.1);
    color: #bf953f;
    border: 1px solid rgba(191, 149, 63, 0.2);
}

/* --- Success Stories / Testimonials --- */
.testimonials-section {
    background-color: transparent;
}
.testimonial-carousel-container {
    width: 100%;
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}
.testimonial-track-wrapper {
    overflow: hidden;
    border-radius: 24px;
    border: 1px solid var(--border-color);
}
.testimonial-track {
    display: flex;
    transition: transform var(--transition-slow);
}
.testimonial-card {
    min-width: 100%;
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    padding: 48px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.quote-mark {
    font-family: var(--font-heading);
    font-size: 5rem;
    line-height: 0.5;
    color: var(--primary);
    opacity: 0.25;
    margin-bottom: -10px;
}
.testimonial-text {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 32px;
    font-weight: 500;
}
.student-info-row {
    display: flex;
    align-items: center;
    gap: 16px;
}
.student-avatar-letter {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    color: #ffffff;
}
.indigo-glow {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}
.cyan-glow {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}
.violet-glow {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.4);
}
.student-card-name {
    font-size: 1.1rem;
    font-weight: 600;
}
.student-achievement {
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.student-achievement .highlight {
    color: var(--secondary);
    font-weight: 600;
}

.carousel-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-top: 32px;
}
.ctrl-btn {
    background: var(--bg-btn-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}
.ctrl-btn:hover {
    background: var(--bg-btn-secondary-hover);
    border-color: var(--border-hover);
    transform: scale(1.05);
}
.carousel-dots {
    display: flex;
    gap: 8px;
}
.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}
.carousel-dot.active {
    width: 24px;
    border-radius: 4px;
    background: var(--primary);
    box-shadow: 0 0 8px var(--primary);
}

/* --- Contact & Lead Form --- */
.contact-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 60px;
    border-radius: 30px;
    box-shadow: var(--card-shadow);
}
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 60px;
}
.contact-details-list {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.contact-detail-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}
.detail-icon {
    width: 44px;
    height: 44px;
    background: var(--bg-db-box);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.05);
    color: var(--secondary);
}
.contact-detail-item h5 {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2px;
}
.contact-detail-item p {
    font-size: 1.05rem;
    font-weight: 500;
}

/* Lead Form container */
.form-box {
    padding: 40px;
    position: relative;
    border-color: var(--border-color);
    overflow: hidden;
}
.form-title {
    font-size: 1.35rem;
    margin-bottom: 8px;
}
.form-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 24px;
}
.inquiry-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.form-double-group {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 16px;
}
.form-group label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.form-group input,
.form-group select,
.form-group textarea {
    background: var(--bg-form-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: var(--transition-fast);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
    background: var(--bg-dark);
}
.form-group select option {
    background-color: var(--bg-dark);
    color: var(--text-primary);
}

/* Form Success State styling */
.form-success-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-success-overlay);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    animation: fadeIn 0.4s ease;
}
.success-content {
    text-align: center;
}
.success-icon {
    width: 60px;
    height: 60px;
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--accent-emerald);
    color: var(--accent-emerald);
    font-size: 1.8rem;
    font-weight: 800;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px auto;
    box-shadow: 0 0 20px var(--accent-emerald-glow);
}
.success-content h4 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}
.success-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}
.planner-pdf-alert {
    background: rgba(6, 182, 212, 0.08);
    border: 1px dashed rgba(6, 182, 212, 0.3);
    padding: 10px;
    border-radius: 6px;
    color: #22d3ee !important;
    font-size: 0.85rem !important;
    margin-bottom: 24px !important;
}

/* --- Footer --- */
.footer {
    background-color: var(--bg-footer);
    border-top: 1px solid var(--border-color);
    padding: 80px 0 0 0;
    position: relative;
    z-index: 1;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.8fr 0.8fr 1.1fr;
    gap: 48px;
    margin-bottom: 60px;
}
.footer-brand .footer-logo {
    margin-bottom: 20px;
}
.footer-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 24px;
}
.footer-socials {
    display: flex;
    gap: 12px;
}
.social-link {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--bg-btn-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
}
.social-link:hover {
    background: var(--gradient-button);
    color: #ffffff;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px var(--primary-glow);
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 24px;
    color: var(--text-primary);
}
.footer-links {
    list-style: none;
}
.footer-links li {
    margin-bottom: 12px;
}
.footer-links li a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.footer-links li a:hover {
    color: var(--secondary);
    padding-left: 4px;
}

.footer-newsletter-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}
.newsletter-form {
    display: flex;
    border: 1px solid var(--border-color);
    background: var(--bg-form-input);
    border-radius: 8px;
    overflow: hidden;
    padding: 3px;
}
.newsletter-form input {
    background: none;
    border: none;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 0.85rem;
    flex-grow: 1;
}
.newsletter-btn {
    background: var(--gradient-button);
    border: none;
    color: #ffffff;
    width: 38px;
    height: 38px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}
.newsletter-btn:hover {
    transform: scale(1.02);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
}
.footer-bottom-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    flex-wrap: wrap;
    gap: 16px;
}
.footer-bottom-links {
    display: flex;
    gap: 24px;
}
.footer-bottom-links a:hover {
    color: var(--text-secondary);
}

/* ==========================================================================
   CSS ANIMATIONS
   ========================================================================== */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}


/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */

/* Large Tablets & Small Desktops (1024px) */
@media (max-width: 1024px) {
    html { font-size: 15px; }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }
    .hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-stats {
        justify-content: center;
    }
    .hero-visual {
        margin-top: 20px;
    }

    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .quiz-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

/* Tablets & Large Phones (768px) */
@media (max-width: 768px) {
    .header {
        height: 70px;
    }
    .navbar {
        height: 70px;
    }
    
    .mobile-menu-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-mobile-menu);
        border-left: 1px solid var(--border-color);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 32px 32px 32px;
        transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 1000;
        box-shadow: -10px 0 30px rgba(0,0,0,0.15);
    }
    
    .nav-menu.open {
        right: 0;
    }

    /* Cross animation for mobile menu toggle */
    .mobile-menu-toggle.open .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .mobile-menu-toggle.open .bar:nth-child(2) {
        opacity: 0;
    }
    .mobile-menu-toggle.open .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-link {
        width: 100%;
        padding: 10px 0;
        font-size: 1.1rem;
    }
    .nav-link::after {
        bottom: 5px;
    }

    .desktop-cta { display: none; }
    .mobile-cta {
        display: block;
        width: 100%;
        text-align: center;
        margin-top: 24px;
    }

    .hero-section {
        padding-top: 120px;
    }
    .hero-title {
        font-size: 2.8rem;
    }
    
    .tab-btn {
        padding: 10px 18px;
        font-size: 0.85rem;
    }

    .testimonial-card {
        padding: 32px;
    }
    .testimonial-text {
        font-size: 1.1rem;
    }

    .quiz-container, .contact-container {
        padding: 32px;
        border-radius: 20px;
    }
    
    .form-box {
        padding: 24px;
    }
    .floating-card {
        display: none; /* Hide floating cards on tablet & mobile screens to prevent overflow */
    }
}

/* Extra Small Phones (480px and down) */
@media (max-width: 480px) {
    html { font-size: 14px; }

    .hero-title {
        font-size: 2.3rem;
    }
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    .hero-actions .btn {
        width: 100%;
    }
    .hero-stats {
        flex-wrap: wrap;
        gap: 16px;
    }
    .hero-stats .divider {
        display: none;
    }
    .stat-item {
        min-width: 40%;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }
    .course-card {
        padding: 24px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }

    .main-card {
        padding: 16px;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .quiz-stats-mini {
        flex-wrap: wrap;
    }
    .quiz-box {
        padding: 16px;
    }
    .quiz-option {
        padding: 12px 16px;
        font-size: 0.9rem;
    }

    .form-double-group {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .footer-bottom-flex {
        text-align: center;
        justify-content: center;
    }
    .footer-bottom-links {
        justify-content: center;
        width: 100%;
    }
    .results-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}