/* =========================================
   Kiggle.ai - Design System & Styles
   ========================================= */

/* ---------- CSS Variables ---------- */
:root {
    --purple-50: #faf5ff;
    --purple-100: #f3e8ff;
    --purple-200: #e9d5ff;
    --purple-300: #d8b4fe;
    --purple-400: #c084fc;
    --purple-500: #a855f7;
    --purple-600: #9333ea;
    --purple-700: #7c3aed;
    --purple-800: #6d28d9;
    --purple-900: #581c87;

    --cyan-400: #22d3ee;
    --cyan-500: #06b6d4;
    --cyan-600: #0891b2;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --white: #ffffff;
    --black: #000000;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 50px rgba(0, 0, 0, 0.12);
    --shadow-purple: 0 8px 30px rgba(139, 92, 246, 0.25);

    --font-sans: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;

    --max-width: 1200px;
    --header-height: 68px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------- Animations ---------- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes float {

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

    50% {
        transform: translateY(-12px);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.5);
        opacity: 0;
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

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

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

@keyframes blobMove {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(30px, -40px) scale(1.1);
    }

    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }

    75% {
        transform: translate(20px, 30px) scale(1.05);
    }
}

.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.8s ease forwards;
}

.animate-fade-up:nth-child(2) {
    animation-delay: 0.15s;
}

.animate-fade-up:nth-child(3) {
    animation-delay: 0.3s;
}

.animate-fade-up:nth-child(4) {
    animation-delay: 0.45s;
}

[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Gradient Text ---------- */
.gradient-text {
    background: linear-gradient(135deg, var(--purple-600), var(--purple-400), var(--cyan-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text-cyan {
    background: linear-gradient(135deg, var(--cyan-500), var(--purple-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =========================================
   HEADER
   ========================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 10;
}

.logo-img {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    color: var(--purple-700);
    letter-spacing: -0.5px;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    transition: color 0.2s;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--purple-600);
    border-radius: 1px;
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--purple-700);
}

.nav-link:hover::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-search {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    border-radius: var(--radius-full);
    transition: all 0.2s;
}

.btn-search:hover {
    background: var(--gray-100);
    color: var(--purple-600);
}

/* Language Switcher */
.lang-switcher {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-600);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    transition: all 0.2s;
    cursor: pointer;
}

.lang-btn:hover {
    background: var(--purple-50);
    border-color: var(--purple-300);
    color: var(--purple-700);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
    z-index: 100;
    overflow: hidden;
}

.lang-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
    text-align: left;
    transition: all 0.15s;
    cursor: pointer;
    border: none;
    background: none;
    font-family: var(--font-sans);
}

.lang-option:hover {
    background: var(--purple-50);
    color: var(--purple-700);
}

.lang-option.active {
    background: var(--purple-50);
    color: var(--purple-700);
    font-weight: 600;
}

.btn-mobile-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 24px;
    padding: 4px 0;
    z-index: 10;
}

.btn-mobile-menu span {
    width: 100%;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s;
}

.btn-mobile-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.btn-mobile-menu.active span:nth-child(2) {
    opacity: 0;
}

.btn-mobile-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    padding: 24px 20px;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 999;
}

.mobile-menu.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-nav-link {
    display: block;
    padding: 14px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.mobile-nav-link:hover {
    background: var(--purple-50);
    color: var(--purple-700);
}

.mobile-lang {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 8px;
}

.mobile-lang-btn {
    flex: 1;
    text-align: center;
    padding: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-600);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-sans);
}

.mobile-lang-btn:hover,
.mobile-lang-btn.active {
    color: var(--purple-700);
    background: var(--purple-50);
    border-color: var(--purple-300);
}

/* =========================================
   HERO
   ========================================= */
.hero {
    position: relative;
    padding: calc(var(--header-height) + 60px) 0 80px;
    background: linear-gradient(180deg, var(--purple-50) 0%, var(--white) 100%);
    overflow: hidden;
    display: flex;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    gap: 60px;
    padding-left: 20px;
    padding-right: 20px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    animation: blobMove 15s infinite ease-in-out;
}

.hero-blob-1 {
    width: 400px;
    height: 400px;
    background: rgba(168, 85, 247, 0.12);
    top: -100px;
    right: -100px;
}

.hero-blob-2 {
    width: 300px;
    height: 300px;
    background: rgba(6, 182, 212, 0.1);
    bottom: -50px;
    left: -50px;
    animation-delay: -5s;
}

.hero-blob-3 {
    width: 200px;
    height: 200px;
    background: rgba(244, 114, 182, 0.1);
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

.hero-content {
    position: relative;
    z-index: 1;
    flex: 1;
    min-width: 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--white);
    border: 1px solid var(--purple-200);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--purple-700);
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.badge-icon {
    font-size: 14px;
}

.hero-title {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.3;
    color: var(--gray-900);
    letter-spacing: -1.5px;
    margin-bottom: 16px;
}

.hero-desc {
    font-size: 17px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 32px;
}

/* Search Box */
.hero-search {
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 6px 6px 6px 20px;
    box-shadow: var(--shadow-lg);
    transition: border-color 0.3s;
    max-width: 520px;
}

.search-box:focus-within {
    border-color: var(--purple-400);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(168, 85, 247, 0.1);
}

.search-icon {
    color: var(--gray-400);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 15px;
    padding: 12px;
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: transparent;
}

.search-input::placeholder {
    color: var(--gray-400);
}

.search-btn {
    background: linear-gradient(135deg, var(--purple-600), var(--purple-700));
    color: var(--white);
    font-size: 15px;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: var(--radius-lg);
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.3);
    flex-shrink: 0;
}

.search-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}

.search-tags {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.search-tag {
    font-size: 13px;
    color: var(--purple-600);
    background: var(--purple-50);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.search-tag:hover {
    background: var(--purple-100);
    border-color: var(--purple-300);
}

/* Stats */
.hero-stats {
    display: flex;
    align-items: center;
    gap: 24px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--purple-700);
    font-family: 'Inter', sans-serif;
}

.stat-suffix {
    font-size: 20px;
    font-weight: 700;
    color: var(--purple-500);
}

.stat-label {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 2px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--gray-200);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    flex: 0 0 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 0;
}

.hero-app-img {
    max-width: 100%;
    position: relative;
}

.hero-app-img img {
    width: 100%;
    height: auto;
    max-height: 580px;
    object-fit: contain;
    filter: drop-shadow(0 20px 50px rgba(124, 58, 237, 0.2));
    transition: transform 0.5s ease;
    animation: float 6s ease-in-out infinite;
}

.hero-app-img:hover img {
    transform: scale(1.03) translateY(-6px);
}

/* =========================================
   SECTION COMMON
   ========================================= */
.section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 32px;
}

.section-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 15px;
    color: var(--gray-500);
    margin-top: 6px;
}

.section-more {
    font-size: 14px;
    font-weight: 600;
    color: var(--purple-600);
    white-space: nowrap;
    transition: color 0.2s;
}

.section-more:hover {
    color: var(--purple-800);
}

/* =========================================
   CATEGORIES
   ========================================= */
.categories {
    padding: 80px 0;
    background: var(--white);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px 16px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    cursor: pointer;
}

.category-card:hover {
    border-color: var(--purple-300);
    background: var(--purple-50);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.category-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
}

.category-count {
    font-size: 12px;
    color: var(--gray-400);
}

/* =========================================
   PROGRAMS
   ========================================= */
.programs {
    padding: 80px 0;
    background: var(--gray-50);
}

.programs.recommended {
    background: var(--white);
}

.program-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.program-scroll {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.program-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    transition: all 0.3s ease;
}

.program-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.program-card-img {
    position: relative;
    width: 100%;
    height: 180px;
    overflow: hidden;
}

.program-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.program-card:hover .program-card-img img {
    transform: scale(1.08);
}

.program-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.program-badge.hot {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: var(--white);
}

.program-badge.new {
    background: linear-gradient(135deg, var(--purple-500), var(--purple-700));
    color: var(--white);
}

.program-badge.best {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: var(--white);
}

.program-badge.ai {
    background: linear-gradient(135deg, var(--cyan-500), var(--purple-600));
    color: var(--white);
}

.program-heart {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.program-heart:hover {
    color: #ef4444;
    transform: scale(1.1);
}

.program-heart.active {
    color: #ef4444;
}

.program-heart.active svg {
    fill: #ef4444;
}

.program-card-body {
    padding: 16px;
}

.program-info-top {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.program-category {
    font-size: 12px;
    font-weight: 600;
    color: var(--purple-600);
    background: var(--purple-50);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.program-age {
    font-size: 12px;
    color: var(--gray-400);
}

.program-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.program-location {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.program-info-bottom {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
}

.program-rating {
    display: flex;
    align-items: center;
    gap: 4px;
}

.stars {
    font-size: 12px;
    color: #fbbf24;
    letter-spacing: -1px;
}

.rating-score {
    font-size: 13px;
    font-weight: 700;
    color: var(--gray-800);
}

.review-count {
    font-size: 12px;
    color: var(--gray-400);
}

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

.price-original {
    font-size: 12px;
    color: var(--gray-400);
    text-decoration: line-through;
    display: block;
}

.price-current {
    font-size: 16px;
    font-weight: 800;
    color: var(--purple-700);
}

/* =========================================
   AI BANNER
   ========================================= */
.ai-banner {
    padding: 80px 0;
    background: linear-gradient(135deg, #1e1b4b, #312e81, #3b0764);
    position: relative;
    overflow: hidden;
}

.ai-banner::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.2), transparent);
    border-radius: 50%;
}

.ai-banner::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15), transparent);
    border-radius: 50%;
}

.ai-banner-content {
    display: flex;
    align-items: center;
    gap: 80px;
    position: relative;
    z-index: 1;
}

.ai-banner-text {
    flex: 1;
}

.ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--cyan-400);
    margin-bottom: 20px;
}

.ai-pulse {
    width: 8px;
    height: 8px;
    background: var(--cyan-400);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.ai-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--white);
    line-height: 1.3;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.ai-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: 32px;
}

.ai-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.ai-feature {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.ai-feature-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.ai-feature strong {
    display: block;
    font-size: 15px;
    color: var(--white);
    margin-bottom: 2px;
}

.ai-feature p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
}

.btn-ai-start {
    display: inline-block;
    background: linear-gradient(135deg, var(--cyan-500), var(--purple-500));
    color: var(--white);
    font-size: 15px;
    font-weight: 700;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.btn-ai-start:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.4);
}

/* AI Visual Card */
.ai-banner-visual {
    flex: 0 0 380px;
}

.ai-visual-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.ai-visual-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ai-visual-avatar {
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.ai-visual-header strong {
    display: block;
    color: var(--white);
    font-size: 15px;
}

.ai-visual-header span {
    font-size: 12px;
    color: var(--cyan-400);
}

.ai-visual-chart {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.chart-bar {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chart-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
    width: 32px;
    flex-shrink: 0;
}

.chart-fill {
    flex: 1;
    height: 24px;
    background: linear-gradient(135deg, var(--purple-500), var(--cyan-500));
    border-radius: var(--radius-full);
    width: var(--fill-width);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 10px;
    transition: width 1.5s ease;
}

.chart-fill span {
    font-size: 11px;
    font-weight: 700;
    color: var(--white);
}

.ai-visual-recommend {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 12px 16px;
}

.ai-visual-recommend span {
    font-size: 12px;
    font-weight: 600;
    color: var(--cyan-400);
    display: block;
    margin-bottom: 4px;
}

.ai-visual-recommend p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
}

/* =========================================
   PROMO BANNER
   ========================================= */
.promo-banner {
    padding: 40px 0;
    background: var(--gray-50);
}

.promo-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.promo-card {
    border-radius: var(--radius-xl);
    padding: 40px;
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    align-items: center;
    transition: transform 0.3s;
}

.promo-card:hover {
    transform: translateY(-4px);
}

.promo-card-1 {
    background: linear-gradient(135deg, var(--purple-600), #4f46e5, var(--purple-800));
}

.promo-card-2 {
    background: linear-gradient(135deg, #ec4899, #be185d, #9f1239);
}

.promo-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
}

.promo-content {
    position: relative;
    z-index: 1;
}

.promo-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 8px;
    display: block;
}

.promo-content h3 {
    font-size: 24px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 8px;
}

.promo-content h3 span {
    color: #fbbf24;
}

.promo-content p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
}

.promo-btn {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.2s;
}

.promo-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* =========================================
   REVIEWS
   ========================================= */
.reviews {
    padding: 80px 0;
    background: var(--white);
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.review-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.3s;
}

.review-card:hover {
    border-color: var(--purple-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.review-avatar {
    width: 44px;
    height: 44px;
    background: var(--purple-50);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.review-user {
    flex: 1;
}

.review-user strong {
    display: block;
    font-size: 14px;
    color: var(--gray-800);
}

.review-user span {
    font-size: 12px;
    color: var(--gray-400);
}

.review-stars {
    font-size: 14px;
    color: #fbbf24;
}

.review-text {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 14px;
}

.review-program {
    background: var(--gray-50);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.review-program span {
    font-size: 13px;
    color: var(--gray-500);
}

/* =========================================
   APP DOWNLOAD
   ========================================= */
.app-download {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--purple-50) 0%, var(--white) 100%);
}

.app-content {
    display: flex;
    align-items: center;
    gap: 60px;
    max-width: 1100px;
    margin: 0 auto;
}

.app-text {
    flex: 1;
    padding-right: 20px;
}

.app-text h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.3;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.app-text p {
    font-size: 16px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 32px;
}

.app-buttons {
    display: flex;
    gap: 12px;
}

.app-store-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--gray-900);
    color: var(--white);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.app-store-btn:hover {
    background: var(--gray-700);
    transform: translateY(-2px);
}

.app-store-btn small {
    font-size: 10px;
    display: block;
    color: rgba(255, 255, 255, 0.7);
}

.app-store-btn strong {
    font-size: 16px;
    display: block;
}

/* App Visual */
.app-visual {
    flex: 0 0 380px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
}

.app-mockup-img {
    max-width: 100%;
    position: relative;
}

.app-mockup-img img {
    width: 100%;
    height: auto;
    max-height: 560px;
    object-fit: contain;
    filter: drop-shadow(0 16px 48px rgba(124, 58, 237, 0.18));
    transition: transform 0.4s ease;
}

.app-mockup-img:hover img {
    transform: scale(1.02) translateY(-4px);
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
    background: var(--gray-900);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}

.footer-top {
    display: flex;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    flex: 1;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.footer-logo-img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
}

.footer-logo span {
    font-size: 22px;
    font-weight: 800;
    color: var(--white);
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.social-link {
    width: 38px;
    height: 38px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.2s;
}

.social-link:hover {
    border-color: var(--purple-500);
    color: var(--purple-400);
    background: rgba(139, 92, 246, 0.1);
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    padding: 4px 0;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: var(--purple-400);
}

.footer-bottom {
    padding-top: 24px;
    text-align: center;
}

.footer-info p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.35);
    line-height: 1.7;
}

.footer-legal {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 12px;
}

.footer-legal a {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal a:hover {
    color: var(--white);
}

.copyright {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.3);
    margin-top: 16px;
}

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        gap: 40px;
        padding-top: calc(var(--header-height) + 40px);
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-stats {
        justify-content: center;
    }

    .search-box {
        max-width: 100%;
    }

    .search-tags {
        justify-content: center;
    }

    .hero-visual {
        flex: 0 0 300px;
        width: 100%;
        padding: 10px 0;
    }

    .hero-app-img img {
        max-height: 480px;
    }

    .category-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .ai-banner-content {
        flex-direction: column;
        gap: 40px;
    }

    .ai-banner-visual {
        flex: none;
        width: 100%;
        max-width: 400px;
        margin: 0 auto;
    }

    .app-content {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .app-buttons {
        justify-content: center;
    }

    .app-visual {
        flex: none;
        max-width: 320px;
        margin: 0 auto;
    }

    .app-text {
        padding-right: 0;
    }

    .footer-top {
        flex-direction: column;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .btn-login,
    .btn-signup {
        display: none;
    }

    .btn-mobile-menu {
        display: flex;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-visual {
        flex: none;
        width: 100%;
        max-width: 280px;
        margin: 20px auto 0;
        padding: 0;
    }

    .hero-app-img img {
        max-height: 360px;
    }

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

    .section-title {
        font-size: 22px;
    }

    .program-grid,
    .program-scroll {
        grid-template-columns: 1fr;
    }

    .promo-cards {
        grid-template-columns: 1fr;
    }

    .review-grid {
        grid-template-columns: 1fr;
    }

    .ai-title {
        font-size: 28px;
    }

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

    .ai-features {
        align-items: center;
    }

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

    .footer-links {
        flex-wrap: wrap;
        gap: 30px;
    }

    .app-text h2 {
        font-size: 28px;
    }

    .app-buttons {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-top: calc(var(--header-height) + 24px);
        padding-bottom: 48px;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }

    .stat-divider {
        width: 60px;
        height: 1px;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .category-card {
        padding: 16px 12px;
    }

    .category-icon {
        width: 44px;
        height: 44px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .promo-card {
        padding: 28px;
    }

    .promo-content h3 {
        font-size: 20px;
    }
}

/* ---------- Core Features Section ---------- */
.core-features {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--purple-50), var(--white));
}

.core-features-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.core-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--gray-900);
    line-height: 1.2;
}

.core-desc {
    font-size: 18px;
    color: var(--gray-600);
    line-height: 1.6;
}

.core-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.core-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--gray-100);
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
    height: 100%;
}

.core-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--purple-200);
}

.core-card-content {
    padding: 20px 16px;
    text-align: center;
    flex: 1;
}

.core-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--gray-900);
    line-height: 1.4;
}

.core-card p {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}

/* Phone Frame */
.core-phone-wrap {
    padding: 20px 24px 8px;
    display: flex;
    justify-content: center;
}

.core-phone {
    width: 180px;
    height: 340px;
    background: #1a1a2e;
    border-radius: 28px;
    padding: 8px;
    position: relative;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18), inset 0 0 0 2px rgba(255, 255, 255, 0.08);
    transition: transform 0.4s;
}

.core-card:hover .core-phone {
    transform: scale(1.03);
}

.core-phone-notch {
    width: 60px;
    height: 6px;
    background: #2a2a3e;
    border-radius: 3px;
    margin: 4px auto 6px;
}

.core-phone-screen {
    width: 100%;
    height: calc(100% - 16px);
    background: #fff;
    border-radius: 18px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Mock App Header */
.mock-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 10px;
    background: var(--purple-600);
    color: white;
    font-size: 11px;
    font-weight: 600;
}

.mock-logo {
    width: 20px;
    height: 20px;
    background: white;
    color: var(--purple-600);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 10px;
}

.mock-title {
    flex: 1;
}

.mock-back {
    font-size: 18px;
    font-weight: 300;
    cursor: pointer;
    line-height: 1;
}

.mock-avatar-sm {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 10px;
    font-weight: 700;
}

/* Feature 1: Search UI */
.mock-search {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 8px 8px 6px;
    padding: 6px 8px;
    background: var(--gray-100);
    border-radius: 8px;
    font-size: 10px;
    color: #999;
}

.mock-list {
    flex: 1;
    padding: 0 8px 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    overflow: hidden;
}

.mock-list-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px;
    background: var(--gray-50);
    border-radius: 8px;
    transition: transform 0.3s;
}

.core-card:hover .mock-list-item:nth-child(1) {
    transform: translateX(3px);
}

.core-card:hover .mock-list-item:nth-child(2) {
    transform: translateX(5px);
    transition-delay: 0.05s;
}

.core-card:hover .mock-list-item:nth-child(3) {
    transform: translateX(3px);
    transition-delay: 0.1s;
}

.core-card:hover .mock-list-item:nth-child(4) {
    transform: translateX(5px);
    transition-delay: 0.15s;
}

.mock-thumb {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    flex-shrink: 0;
}

.mock-info {
    flex: 1;
}

.mock-name {
    font-size: 10px;
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.3;
}

.mock-meta {
    font-size: 8px;
    color: var(--gray-500);
}

/* Feature 2: Chat UI */
.mock-chat {
    flex: 1;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    overflow: hidden;
    background: #f8f9fa;
}

.mock-bubble {
    padding: 5px 8px;
    border-radius: 10px;
    font-size: 9px;
    line-height: 1.4;
    max-width: 80%;
    word-break: break-word;
}

.mock-bubble-in {
    background: var(--purple-100);
    color: var(--gray-800);
    align-self: flex-start;
    border-bottom-left-radius: 3px;
}

.mock-bubble-out {
    background: var(--purple-600);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 3px;
}

.mock-schedule-card {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.15);
    padding: 5px 7px;
    border-radius: 6px;
    margin-top: 2px;
}

.mock-schedule-icon {
    font-size: 14px;
}

.mock-schedule-title {
    font-size: 9px;
    font-weight: 600;
}

.mock-schedule-time {
    font-size: 8px;
    opacity: 0.85;
}

.mock-chat-input {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 8px;
    font-size: 9px;
    color: #aaa;
    border-top: 1px solid var(--gray-200);
    background: white;
}

.mock-send-btn {
    color: var(--purple-600);
    font-size: 14px;
}

/* Feature 3: Profile UI */
.mock-profile {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 10px 8px;
    gap: 4px;
}

.mock-profile-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 4px;
    transition: transform 0.4s;
}

.core-card:hover .mock-profile-avatar {
    transform: scale(1.1);
}

.mock-profile-name {
    font-size: 11px;
    font-weight: 700;
    color: var(--gray-900);
}

.mock-profile-role {
    font-size: 8px;
    color: var(--gray-500);
}

.mock-profile-stars {
    font-size: 10px;
    color: #f59e0b;
    margin: 2px 0;
}

.mock-profile-stars span {
    color: var(--gray-700);
    font-weight: 600;
    font-size: 9px;
}

.mock-profile-stats {
    display: flex;
    gap: 10px;
    margin: 6px 0;
    padding: 6px 0;
    border-top: 1px solid var(--gray-100);
    border-bottom: 1px solid var(--gray-100);
    width: 100%;
    justify-content: center;
}

.mock-stat {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.mock-stat strong {
    font-size: 11px;
    color: var(--purple-600);
}

.mock-stat span {
    font-size: 7px;
    color: var(--gray-500);
}

.mock-profile-btn {
    margin-top: 4px;
    padding: 5px 20px;
    background: var(--purple-600);
    color: white;
    border-radius: 12px;
    font-size: 9px;
    font-weight: 600;
    transition: transform 0.3s, background 0.3s;
}

.core-card:hover .mock-profile-btn {
    background: var(--purple-700);
    transform: scale(1.05);
}

/* Feature 4: Trust UI */
.mock-trust {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    gap: 6px;
}

.mock-trust-icon {
    font-size: 28px;
    transition: transform 0.4s;
}

.core-card:hover .mock-trust-icon {
    transform: scale(1.15) rotate(-5deg);
}

.mock-trust-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--gray-900);
}

.mock-trust-checks {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mock-check {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 9px;
    color: var(--gray-700);
    padding: 4px 6px;
    background: var(--gray-50);
    border-radius: 6px;
    transition: transform 0.3s, background 0.3s;
}

.core-card:hover .mock-check {
    background: #f0fdf4;
}

.core-card:hover .mock-check:nth-child(1) {
    transform: translateX(2px);
}

.core-card:hover .mock-check:nth-child(2) {
    transform: translateX(4px);
    transition-delay: 0.05s;
}

.core-card:hover .mock-check:nth-child(3) {
    transform: translateX(2px);
    transition-delay: 0.1s;
}

.core-card:hover .mock-check:nth-child(4) {
    transform: translateX(4px);
    transition-delay: 0.15s;
}

.mock-check-icon {
    width: 14px;
    height: 14px;
    background: #22c55e;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8px;
    font-weight: 700;
    flex-shrink: 0;
}

.mock-trust-badge {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 5px 12px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-radius: 12px;
    font-size: 9px;
    font-weight: 600;
    color: #92400e;
    margin-top: 2px;
}

/* Responsive */
@media (max-width: 1024px) {
    .core-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .core-grid {
        grid-template-columns: 1fr;
        max-width: 360px;
        margin: 0 auto;
    }

    .core-title {
        font-size: 28px;
    }

    .core-phone {
        width: 200px;
        height: 370px;
    }
}