/* ===== CSS VARIABLES ===== */
:root {
    --bg-main: #0F1117;
    --bg-card: #161A23;
    --accent-cyan: #00E5FF;
    --accent-orange: #FF6B00;
    --text-main: #FFFFFF;
    --text-sub: #A1A7B3;
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-orange));
    --gradient-primary-glow: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(255, 107, 0, 0.15));
    --border-glow: rgba(0, 229, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(22, 26, 35, 0.65);
    
    --radius: 12px;
    --radius-lg: 20px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --max-w: 1200px;
    --header-h: 76px;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; background: var(--bg-main); }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-main);
    background: var(--bg-main);
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button, input, textarea, select { font-family: inherit; color: inherit; }

/* ===== CONTAINER ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ===== TYPOGRAPHY ===== */
h1 { font-size: clamp(2.25rem, 6vw, 3.75rem); font-weight: 800; line-height: 1.15; letter-spacing: -1px; }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; line-height: 1.25; letter-spacing: -0.5px; }
h3 { font-size: 1.35rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 1.1rem; font-weight: 600; }
p { color: var(--text-sub); line-height: 1.75; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 24px; border-radius: var(--radius-sm);
    font-size: 15px; font-weight: 600; cursor: pointer; border: none;
    transition: var(--transition); white-space: nowrap; text-decoration: none;
    outline: none;
}
.btn-primary { 
    background: var(--gradient-primary); 
    color: #000000;
    box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}
.btn-primary:hover { 
    transform: translateY(-2px); 
    box-shadow: 0 0 30px rgba(0, 229, 255, 0.4); 
    color: #000000;
}
.btn-outline { 
    background: transparent; 
    color: var(--text-main); 
    border: 1px solid rgba(255, 255, 255, 0.15); 
}
.btn-outline:hover { 
    border-color: var(--accent-cyan); 
    background: rgba(0, 229, 255, 0.05); 
    color: var(--accent-cyan);
}
.btn-dark { 
    background: var(--bg-card); 
    color: var(--text-main); 
    border: 1px solid var(--glass-border);
}
.btn-dark:hover { 
    border-color: var(--accent-orange); 
    background: rgba(255, 107, 0, 0.05); 
    color: var(--accent-orange);
    transform: translateY(-2px); 
}
.btn-ghost { 
    background: rgba(255, 255, 255, 0.05); 
    color: var(--text-sub); 
    border: 1px solid transparent; 
}
.btn-ghost:hover { 
    background: rgba(255, 255, 255, 0.08); 
    color: var(--text-main); 
}

/* ===== BADGE ===== */
.badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: 100px; font-size: 13px; font-weight: 600;
    background: rgba(0, 229, 255, 0.08); color: var(--accent-cyan);
    border: 1px solid rgba(0, 229, 255, 0.15); margin-bottom: 20px;
}
.badge-orange {
    background: rgba(255, 107, 0, 0.08); color: var(--accent-orange);
    border: 1px solid rgba(255, 107, 0, 0.15);
}

/* ===== SECTION ===== */
.section { padding: 90px 0; position: relative; }
.section-dark { background: var(--bg-main); }
.section-gray { background: var(--bg-card); border-top: 1px solid var(--glass-border); border-bottom: 1px solid var(--glass-border); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { margin-bottom: 16px; color: var(--text-main); }
.section-header h2 span { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.section-header p { color: var(--text-sub); max-width: 560px; margin: 0 auto; font-size: 17px; }
.section-cta { text-align: center; margin-top: 48px; }

/* ===== HEADER ===== */
#site-header {
    position: sticky; top: 0; z-index: 1000; 
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border); 
    height: var(--header-h);
    transition: var(--transition);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; gap: 24px; }
.site-logo { display: flex; align-items: center; gap: 8px; color: var(--text-main); font-size: 20px; font-weight: 800; letter-spacing: -0.5px; }
.logo-icon { width: 34px; height: 34px; background: var(--gradient-primary); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: bold; color: #000000; }
#site-nav ul { display: flex; align-items: center; gap: 2px; }
#site-nav a { 
    color: var(--text-sub); font-size: 14px; font-weight: 500; 
    padding: 8px 16px; border-radius: var(--radius-sm); 
    transition: var(--transition); white-space: nowrap; 
    position: relative;
}
#site-nav a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}
#site-nav a:hover::after, #site-nav .current a::after {
    transform: scaleX(1);
    transform-origin: left;
}
#site-nav a:hover, #site-nav .current a { color: var(--text-main); background: rgba(255,255,255,0.03); }
.header-cta { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.header-cta .btn { padding: 8px 16px; font-size: 14px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; color: var(--text-main); font-size: 22px; line-height: 1; }

/* ===== ANIMATIONS ===== */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
    100% { transform: translateY(0px); }
}
@keyframes pulseGlow {
    0% { opacity: 0.3; }
    50% { opacity: 0.5; }
    100% { opacity: 0.3; }
}

/* ===== HERO ===== */
.hero {
    background: var(--bg-main);
    background-image: radial-gradient(ellipse at 20% 50%, rgba(0,229,255,0.12) 0%, transparent 60%), radial-gradient(ellipse at 80% 20%, rgba(255,107,0,0.08) 0%, transparent 50%);
    padding: 120px 0 100px; color: var(--text-main); overflow: hidden;
    position: relative;
}
.hero::before {
    content: '';
    position: absolute;
    top: 10%;
    left: 15%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0,229,255,0.08) 0%, transparent 70%);
    z-index: 1;
    pointer-events: none;
    animation: pulseGlow 10s ease-in-out infinite;
}
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 64px; align-items: center; position: relative; z-index: 2; }
.hero-tag { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 100px; background: rgba(0, 229, 255, 0.08); border: 1px solid rgba(0, 229, 255, 0.2); color: var(--accent-cyan); font-size: 13px; font-weight: 600; margin-bottom: 24px; }
.hero h1 { color: var(--text-main); margin-bottom: 20px; }
.hero h1 span { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: 18px; color: var(--text-sub); margin-bottom: 36px; max-width: 520px; }
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual { display: flex; justify-content: center; }
.hero-card { 
    background: var(--bg-card); 
    border: 1px solid var(--glass-border); 
    border-radius: var(--radius-lg); 
    padding: 32px; 
    max-width: 380px; 
    width: 100%;
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5), 0 0 25px rgba(0, 229, 255, 0.05);
}
.hero-card-header { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.hero-card-icon { width: 44px; height: 44px; background: var(--gradient-primary); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold; color: #000000; flex-shrink: 0; }
.hero-card-title { color: var(--text-main); font-size: 15px; font-weight: 600; }
.hero-card-sub { color: var(--text-sub); font-size: 12px; }
.hero-stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.hero-stat { background: rgba(255,255,255,0.02); border: 1px solid var(--glass-border); border-radius: 10px; padding: 14px; text-align: center; }
.hero-stat-num { font-size: 22px; font-weight: 800; color: var(--accent-cyan); }
.hero-stat-label { font-size: 11px; color: var(--text-sub); margin-top: 2px; }
.progress-row { margin-bottom: 10px; }
.progress-label { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-sub); margin-bottom: 5px; }
.progress-bar { height: 6px; background: rgba(255,255,255,0.05); border-radius: 100px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--gradient-primary); border-radius: 100px; }

/* ===== STATS BAR ===== */
.stats-bar {
    background: var(--bg-card);
    padding: 32px 0;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}
.about-stats { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; text-align: center; }
.about-stat { flex: 1; min-width: 200px; }
.stat-num { font-size: 36px; font-weight: 800; color: var(--text-main); margin-bottom: 6px; }
.about-stat-label { font-size: 14px; color: var(--text-sub); }

/* ===== SERVICES GRID ===== */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }
.service-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.service-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}
.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-glow);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 229, 255, 0.05);
}
.service-card:hover::before {
    transform: scaleX(1);
}
.service-card h3 { color: var(--text-main); margin-bottom: 14px; }
.service-card p { font-size: 15px; margin-bottom: 24px; }
.service-link {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 14px; font-weight: 600; color: var(--accent-cyan);
    transition: var(--transition);
}
.service-card:hover .service-link {
    color: var(--accent-orange);
    transform: translateX(4px);
}

/* ===== PLAYGROUND / INTERACTIVE TOOLS ===== */
.playground-wrap {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0,0,0,0.4);
}
.playground-tabs {
    background: rgba(0, 0, 0, 0.15);
    border-right: 1px solid var(--glass-border);
    padding: 24px;
}
.playground-tabs h4 {
    color: var(--text-main);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
    opacity: 0.6;
}
.play-tab-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid transparent;
    text-align: left;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-sub);
    transition: var(--transition);
    margin-bottom: 8px;
}
.play-tab-btn:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-main);
}
.play-tab-btn.active {
    background: rgba(0, 229, 255, 0.08);
    border-color: rgba(0, 229, 255, 0.2);
    color: var(--accent-cyan);
}
.playground-content {
    padding: 32px;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}
.play-pane {
    display: none;
    flex-direction: column;
    height: 100%;
    gap: 20px;
}
.play-pane.active {
    display: flex;
}
.play-pane p {
    font-size: 14px;
    margin-bottom: 8px;
}
.tool-input-wrap, .tool-output-wrap {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.tool-textarea {
    width: 100%;
    min-height: 120px;
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 16px;
    color: var(--text-main);
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
    resize: vertical;
    transition: var(--transition);
    outline: none;
}
.tool-textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.1);
}
.tool-input {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text-main);
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}
.tool-input:focus {
    border-color: var(--accent-cyan);
}
.tool-select {
    background: var(--bg-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text-main);
    font-size: 14px;
    outline: none;
}
.tool-output {
    min-height: 120px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 16px;
    color: var(--text-sub);
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
    white-space: pre-wrap;
    word-break: break-all;
    position: relative;
    overflow-x: auto;
}
.tool-output.has-content {
    color: var(--accent-cyan);
    border-color: rgba(0, 229, 255, 0.2);
}
.tool-row-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* ===== WHY CHOOSE US / GRID ===== */
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 32px; }
.why-item {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px;
    position: relative;
    transition: var(--transition);
}
.why-item:hover {
    border-color: var(--border-glow);
    transform: translateY(-2px);
}
.why-num {
    font-size: 40px; font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    line-height: 1;
}
.why-content h3 { color: var(--text-main); margin-bottom: 12px; font-size: 17px; }
.why-content p { font-size: 14px; }

/* ===== COURSE SUMMARY & SLIDER ===== */
.hscroll-wrap {
    overflow-x: auto;
    padding: 16px 0;
    margin: 0 -24px 36px;
    padding-left: 24px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.hscroll-track { display: flex; gap: 24px; padding-right: 24px; }
.module-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px;
    min-width: 280px;
    width: 280px;
    flex-shrink: 0;
    transition: var(--transition);
    position: relative;
}
.module-card:hover {
    border-color: rgba(255, 107, 0, 0.2);
    transform: translateY(-2px);
}
.module-card-num {
    position: absolute; top: 20px; right: 24px;
    font-size: 12px; font-weight: 700; color: var(--accent-orange);
    opacity: 0.8;
}
.module-card-icon { font-size: 28px; margin-bottom: 20px; }
.module-card h3 { color: var(--text-main); font-size: 16px; margin-bottom: 12px; }
.module-card p { font-size: 13px; }

.course-price-summary {
    display: flex; justify-content: space-between; align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px 48px;
    gap: 32px;
}
.course-price-left { display: flex; flex-direction: column; gap: 4px; }
.course-price-old { font-size: 15px; color: var(--text-sub); text-decoration: line-through; }
.course-price-new { font-size: 28px; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: 12px; }
.course-price-sale { font-size: 13px; font-weight: 700; color: #000; background: var(--accent-orange); padding: 2px 8px; border-radius: 4px; }
.course-price-note { font-size: 13px; color: var(--text-sub); margin-top: 4px; }
.course-price-cta { font-size: 15px; padding: 14px 32px; }

/* ===== SERVICES DETAIL CARDS ===== */
.svc-hcard {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 32px;
    min-width: 300px;
    width: 300px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
}
.svc-hcard-featured {
    border-color: var(--accent-orange);
    box-shadow: 0 10px 25px rgba(255, 107, 0, 0.05);
}
.svc-hcard-icon { font-size: 32px; margin-bottom: 20px; }
.svc-hcard h3 { color: var(--text-main); margin-bottom: 12px; font-size: 18px; }
.svc-hcard p { font-size: 14px; margin-bottom: 24px; }
.svc-hcard-foot { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }
.svc-hcard-price { font-size: 20px; font-weight: 800; color: var(--text-main); }
.svc-hcard-unit { font-size: 12px; color: var(--text-sub); }

/* ===== TESTIMONIAL ===== */
.testimonial {
    background: var(--bg-main);
    background-image: radial-gradient(circle at center, rgba(255, 107, 0, 0.06) 0%, transparent 60%);
    padding: 100px 0; text-align: center;
    border-top: 1px solid var(--glass-border);
}
.testimonial-quote {
    font-size: clamp(1.25rem, 3vw, 1.85rem); font-weight: 600;
    color: var(--text-main); max-width: 800px; margin: 0 auto 28px;
    line-height: 1.5; letter-spacing: -0.5px;
}
.testimonial-quote strong { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.testimonial-author { font-size: 14px; color: var(--text-sub); font-weight: 500; }

/* ===== BLOG GRID ===== */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}
.post-card:hover {
    border-color: var(--border-glow);
    transform: translateY(-2px);
}
.post-thumb {
    height: 160px; background: rgba(255,255,255,0.02);
    display: flex; align-items: center; justify-content: center;
    font-size: 48px; border-bottom: 1px solid var(--glass-border);
}
.post-body { padding: 28px; }
.post-cat { font-size: 11px; font-weight: 700; color: var(--accent-cyan); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }
.post-body h3 { font-size: 17px; margin-bottom: 12px; line-height: 1.4; color: var(--text-main); }
.post-body h3 a:hover { color: var(--accent-cyan); }
.post-body p { font-size: 14px; margin-bottom: 20px; }
.post-meta { font-size: 12px; color: var(--text-sub); }

/* ===== NEWSLETTER ===== */
.newsletter {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 56px 48px; text-align: center;
    box-shadow: 0 20px 45px rgba(0,0,0,0.4);
    max-width: 800px; margin: 0 auto;
}
.newsletter h2 { margin-bottom: 12px; }
.newsletter p { max-width: 480px; margin: 0 auto 32px; }
.newsletter-form { display: flex; max-width: 500px; margin: 0 auto; gap: 8px; }
.newsletter-form input {
    flex: 1; padding: 14px 20px; border-radius: var(--radius-sm);
    background: var(--bg-main); border: 1px solid var(--glass-border);
    color: var(--text-main); font-size: 14px; outline: none;
    transition: var(--transition);
}
.newsletter-form input:focus { border-color: var(--accent-cyan); }

/* ===== FOOTER ===== */
#site-footer {
    background: var(--bg-main);
    border-top: 1px solid var(--glass-border);
    padding: 80px 0 32px;
    color: var(--text-sub);
    font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 48px; margin-bottom: 64px; }
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand p { font-size: 14px; margin-bottom: 24px; line-height: 1.6; }
.social-links { display: flex; gap: 10px; }
.social-link {
    width: 36px; height: 36px; border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-main); font-weight: bold;
    transition: var(--transition);
}
.social-link:hover {
    background: var(--gradient-primary);
    color: #000000;
    border-color: transparent;
    transform: translateY(-2px);
}
.footer-col h4 { color: var(--text-main); margin-bottom: 20px; text-transform: uppercase; font-size: 12px; letter-spacing: 1px; }
.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col a:hover { color: var(--accent-cyan); }
.footer-contact p { margin-bottom: 12px; }
.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding-top: 32px; display: flex; justify-content: space-between;
    flex-wrap: wrap; gap: 16px; font-size: 13px;
}

/* ===== DIALOG / MODAL ===== */
.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 17, 23, 0.85);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s ease;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal-container {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    width: 90%; max-width: 500px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.6), 0 0 40px rgba(0, 229, 255, 0.1);
    transform: translateY(20px);
    transition: transform 0.3s ease;
    overflow: hidden;
}
.modal-overlay.open .modal-container { transform: translateY(0); }
.modal-header {
    padding: 24px; border-bottom: 1px solid var(--glass-border);
    display: flex; align-items: center; justify-content: space-between;
}
.modal-header h3 { color: var(--text-main); }
.modal-close {
    background: none; border: none; font-size: 24px; color: var(--text-sub);
    cursor: pointer; transition: var(--transition);
}
.modal-close:hover { color: var(--accent-cyan); }
.modal-body { padding: 24px; max-height: 70vh; overflow-y: auto; }

/* Checkout details inside modal */
.checkout-product-info {
    display: flex; gap: 16px; align-items: center;
    background: rgba(0,0,0,0.2); border-radius: var(--radius);
    padding: 16px; margin-bottom: 24px; border: 1px solid var(--glass-border);
}
.checkout-img-wrap { width: 64px; height: 64px; background: rgba(255,255,255,0.03); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 28px; }
.checkout-details h4 { color: var(--text-main); margin-bottom: 4px; }
.checkout-price { font-size: 18px; font-weight: 700; color: var(--accent-cyan); }
.checkout-instructions p { font-size: 14px; margin-bottom: 20px; }
.bank-transfer-details {
    background: rgba(0,0,0,0.15); border-radius: var(--radius-sm);
    padding: 18px; margin-bottom: 24px; border: 1px solid var(--glass-border);
    display: flex; flex-direction: column; gap: 12px;
}
.bank-row { display: flex; justify-content: space-between; font-size: 14px; }
.bank-label { color: var(--text-sub); }
.bank-value { color: var(--text-main); font-weight: 600; display: flex; align-items: center; gap: 8px; }
.copy-btn {
    background: rgba(0, 229, 255, 0.08); border: 1px solid rgba(0, 229, 255, 0.2);
    color: var(--accent-cyan); font-size: 11px; padding: 2px 8px;
    border-radius: 4px; cursor: pointer; transition: var(--transition);
}
.copy-btn:hover { background: var(--accent-cyan); color: #000; }
.qr-code-wrap { text-align: center; margin-bottom: 8px; }
.qr-code-img { border-radius: var(--radius-sm); border: 1px solid var(--glass-border); background: white; padding: 10px; }
.modal-footer {
    padding: 16px 24px; border-top: 1px solid var(--glass-border);
    display: flex; justify-content: flex-end; gap: 12px;
    background: rgba(0,0,0,0.1);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 48px; }
    .hero-subtitle { margin-left: auto; margin-right: auto; }
    .hero-buttons { justify-content: center; }
    .hero-visual { order: -1; }
    .playground-wrap { grid-template-columns: 1fr; }
    .playground-tabs { border-right: none; border-bottom: 1px solid var(--glass-border); }
    .play-tab-btn { margin-bottom: 0; }
    .playground-tabs-row { display: flex; overflow-x: auto; gap: 8px; padding-bottom: 8px; }
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    #site-nav {
        position: absolute; top: var(--header-h); left: 0; right: 0;
        background: var(--bg-main); border-bottom: 1px solid var(--glass-border);
        padding: 24px; display: none;
        box-shadow: 0 15px 30px rgba(0,0,0,0.5);
    }
    #site-nav.open { display: block; }
    #site-nav ul { flex-direction: column; align-items: stretch; gap: 8px; }
    #site-nav a { display: block; padding: 12px 16px; }
    #site-nav a::after { display: none; }
    .header-cta { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .course-price-summary { flex-direction: column; text-align: center; padding: 32px 24px; }
    .tool-row-split { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
}