/* ─── TOKENS ──────────────────────────────── */
    :root {
      --c0: #F6F4F1;   /* off-white */
      --c1: #E9E5DD;   /* pale grey-beige */
      --c2: #D6C9B6;   /* light sand */
      --c3: #CBB79E;   /* warm beige */
      --c4: #B69A7A;   /* tan */
      --c5: #9F7F63;   /* brown — primary accent */
      --c6: #7a5c42;   /* dark brown */
      --rose: #CFAFA1;
      --ink: #3a2a1c;
      --mid: #6b4f38;
      --soft: #9a7c64;
      --r-sm: 14px;
      --r-md: 20px;
      --r-lg: 28px;
    }

    /* ─── RESET ───────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body { font-family: 'Source Sans 3', sans-serif; background: var(--c0); color: var(--ink); line-height: 1.7; overflow-x: hidden; }
    [hidden] { display: none !important; }
    img { display: block; max-width: 100%; }
    a { color: inherit; text-decoration: none; }

    /* ─── TYPOGRAPHY ──────────────────────────── */
    .serif { font-family: 'Lora', serif; }
    h1 { font-family: 'Lora', serif; font-size: clamp(2.8rem, 5.5vw, 4.2rem); font-weight: 300; line-height: 1.1; }
    h2 { font-family: 'Lora', serif; font-size: clamp(2.2rem, 4vw, 3.2rem); font-weight: 300; line-height: 1.15; }
    h3 { font-family: 'Lora', serif; font-size: clamp(1.3rem, 2.4vw, 1.8rem); font-weight: 400; line-height: 1.3; }
    p  { font-size: 1.2rem; color: var(--mid); line-height: 1.8; }
    .label {
      display: inline-block;
      font-size: 0.9rem; letter-spacing: 0.22em; text-transform: uppercase;
      color: var(--c5); font-weight: 600; margin-bottom: 14px;
    }

    /* ─── LAYOUT ──────────────────────────────── */
    .wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
    section { padding: 96px 0; }

    /* ─── BUTTONS ─────────────────────────────── */
    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 13px 28px; border-radius: 100px;
      font-family: 'Source Sans 3', sans-serif; font-size: 1.2rem; font-weight: 600;
      letter-spacing: 0.02em; transition: all 0.22s; cursor: pointer; border: none;
    }
    .btn-dark { background: var(--ink); color: var(--c0); }
    .btn-dark:hover { background: var(--c6); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(58,42,28,0.2); }
    .btn-outline { background: transparent; color: var(--ink); border: 1.5px solid var(--c3); }
    .btn-outline:hover { background: var(--c1); }
    .btn-white { background: #fff; color: var(--c5); }
    .btn-white:hover { background: var(--c0); transform: translateY(-1px); }
    .btn-yt { background: #FF0000; color: #fff; }
    .btn-yt:hover { background: #cc0000; transform: translateY(-1px); }

    /* ─── NAVBAR ──────────────────────────────── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: rgba(246,244,241,0.94); backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--c1);
      padding: 0 36px; height: 80px;
    }
    .nav-inner {
      max-width: 1180px; margin: 0 auto;
      display: flex; align-items: center; justify-content: space-between;
      height: 100%;
    }
    .nav-brand { display: flex; align-items: center; gap: 14px; }
    .nav-brand img { height: 60px; width: 60px; object-fit: contain; border-radius: 50%; }
    .nav-brand-name {
      font-family: 'Lora', serif;
      font-size: 1.25rem; color: var(--ink); letter-spacing: 0.04em; line-height: 1.2;
    }
    .nav-brand-name span { display: block; font-size: 0.68rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--soft); font-family: 'Source Sans 3', sans-serif; }
    .nav-brand-slogan { display: block; font-size: 1rem; color: var(--soft); font-style: italic; font-family: 'Lora', serif; letter-spacing: 0.02em; margin-top: 1px; }
    .nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
    .nav-links a { font-size: 1.2rem; font-weight: 500; color: var(--mid); transition: color 0.2s; }
    .nav-links a:hover { color: var(--c5); }
    .nav-link-button { border: 0; background: transparent; padding: 0; font: inherit; font-size: 1.2rem; font-weight: 500; color: var(--mid); cursor: pointer; transition: color 0.2s; }
    .nav-link-button:hover { color: var(--c5); }
    .nav-cta { background: var(--c5) !important; color: #fff !important; padding: 9px 22px; border-radius: 100px; }
    .nav-cta:hover { background: var(--c6) !important; }
    .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
    .hamburger span { display: block; width: 22px; height: 1.5px; background: var(--ink); }

    /* ─── HERO ────────────────────────────────── */
    #hero {
      padding-top: 80px;
      position: relative;
      min-height: 92vh;
      display: flex; align-items: center; justify-content: center;
      overflow: hidden;
    }
    .hero-banner {
      position: absolute; inset: 0;
    }
    .hero-banner img {
      width: 100%; height: 100%; object-fit: cover; object-position: center top;
    }
    .hero-banner::after {
      content: ''; position: absolute; inset: 0;
      background: linear-gradient(to top, rgba(20,12,6,0.75) 0%, rgba(20,12,6,0.1) 50%, transparent 100%);
    }
    .hero-content {
      position: relative; z-index: 2;
      max-width: 1180px; width: 100%; margin: 0 auto;
      padding: 0 72px 60px;
      display: flex; flex-direction: column; align-items: flex-start;
      justify-content: flex-end;
      min-height: inherit;
    }
    .hero-content .eyebrow {
      display: flex; align-items: center; gap: 12px; margin-bottom: 28px;
    }
    .hero-content .eyebrow::before { content: ''; display: block; width: 36px; height: 1px; background: rgba(246,244,241,0.5); }
    .hero-content h1 { color: #fff; margin-bottom: 6px; text-shadow: 0 2px 20px rgba(0,0,0,0.3); }
    .hero-content h1 em { font-style: italic; color: var(--c3); display: block; }
    .hero-sub {
      font-family: 'Lora', serif;
      font-size: clamp(1rem, 1.6vw, 1.3rem); font-style: italic; font-weight: 300;
      color: rgba(246,244,241,0.82); margin-bottom: 20px;
    }
    .hero-desc { font-size: 1rem; max-width: 480px; margin-bottom: 36px; color: rgba(246,244,241,0.78); line-height: 1.8; }
    .hero-btns { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 52px; }
    .hero-stats {
      display: flex; gap: 48px; padding-top: 28px;
      border-top: 1px solid rgba(246,244,241,0.2);
    }
    .stat-num { font-family: 'Lora', serif; font-size: 2.4rem; font-weight: 600; color: #fff; display: block; line-height: 1; margin-bottom: 4px; }
    .stat-lbl { font-size: 0.67rem; letter-spacing: 0.15em; text-transform: uppercase; color: rgba(246,244,241,0.6); }
    @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

    /* ─── MARQUEE ─────────────────────────────── */
    .marquee { background: var(--c5); overflow: hidden; padding: 13px 0; }
    .marquee-track { display: flex; width: max-content; animation: marquee 28s linear infinite; }
    .marquee-item {
      font-family: 'Lora', serif; font-size: 1rem; font-style: italic; font-weight: 300;
      color: rgba(246,244,241,0.88); white-space: nowrap; padding: 0 28px;
      border-right: 1px solid rgba(255,255,255,0.18);
    }
    @keyframes marquee { to { transform: translateX(-50%); } }

    /* ─── PAIN POINTS ─────────────────────────── */
    #pain { background: var(--c0); }
    .pain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
    .pain-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; }
    .pain-card {
      background: var(--c1); border-radius: var(--r-md); padding: 22px 20px;
      border: 1px solid var(--c2);
    }
    .pain-icon { font-size: 1.5rem; margin-bottom: 10px; }
    .pain-card h4 { font-family: 'Lora', serif; font-size: 1.15rem; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
    .pain-card p { font-size: 1.1rem; }
    .pain-photo { position: relative; border-radius: var(--r-lg); overflow: hidden; }
    .pain-photo img { width: 100%; height: 520px; object-fit: cover; object-position: top; }
    .pain-cert {
      position: absolute; bottom: 28px; right: 28px;
      background: rgba(246,244,241,0.97); border-radius: var(--r-sm);
      padding: 14px 18px; border: 1px solid var(--c2);
      box-shadow: 0 4px 20px rgba(58,42,28,0.1);
    }
    .pain-cert p { font-size: 0.7rem; color: var(--soft); }
    .pain-cert strong { font-size: 1rem; color: var(--c5); }

    /* ─── METHOD ──────────────────────────────── */
    #method { background: var(--c1); }
    .method-hd { text-align: center; max-width: 800px; margin: 0 auto 52px; }
    .method-hd h2 { color: var(--ink); margin-bottom: 12px; }
    .method-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
    .method-card {
      background: var(--c0); border-radius: var(--r-md); padding: 28px 22px;
      border: 1px solid var(--c2); transition: transform 0.22s, box-shadow 0.22s;
    }
    .method-card:hover { transform: translateY(-5px); box-shadow: 0 16px 40px rgba(0,0,0,0.06); }
    .method-num { font-family: 'Lora', serif; font-size: 2.8rem; font-weight: 600; color: var(--c3); line-height: 1; margin-bottom: 14px; }
    .method-card h3 { font-size: 1.15rem; color: var(--ink); margin-bottom: 8px; }
    .method-card p { font-size: 1.2rem; }

    /* ─── CLASSES ─────────────────────────────── */
    #classes { background: var(--c0); }
    .classes-hd { text-align: center; max-width: 700px; margin: 0 auto 52px; }
    .classes-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 20px; }
    .class-card {
      border-radius: var(--r-lg); padding: 40px 36px;
      display: flex; flex-direction: column;
      border: 1px solid var(--c2);
      transition: transform 0.28s, box-shadow 0.28s;
      position: relative; overflow: hidden;
    }
    .class-card::before {
      content: ''; position: absolute; top: -60px; right: -60px;
      width: 200px; height: 200px; border-radius: 50%;
      background: rgba(255,255,255,0.06);
      pointer-events: none;
    }
    .class-card:hover { transform: translateY(-6px); box-shadow: 0 24px 56px rgba(58,42,28,0.14); }
    .class-card-1 { background: linear-gradient(135deg, #7a5c42 0%, #9F7F63 100%); }
    .class-card-2 { background: linear-gradient(135deg, #5a3c28 0%, #7a5c42 100%); }
    .class-card-3 { background: linear-gradient(135deg, #CBB79E 0%, #B69A7A 100%); }
    .class-card-4 { background: linear-gradient(135deg, #D6C9B6 0%, #CBB79E 100%); }
    .class-icon {
      font-size: 2.8rem; margin-bottom: 24px; display: block;
      filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
    }
    .class-tag {
      font-size: 0.62rem; letter-spacing: 0.22em; text-transform: uppercase;
      font-weight: 700; margin-bottom: 10px; display: block; opacity: 0.75;
    }
    .class-card-1 .class-tag, .class-card-2 .class-tag { color: rgba(246,244,241,0.8); }
    .class-card-3 .class-tag, .class-card-4 .class-tag { color: var(--mid); }
    .class-body { flex: 1; display: flex; flex-direction: column; }
    .class-body h3 { margin-bottom: 12px; font-size: 1.5rem; line-height: 1.25; }
    .class-card-1 .class-body h3, .class-card-2 .class-body h3 { color: #fff; }
    .class-card-3 .class-body h3, .class-card-4 .class-body h3 { color: var(--ink); }
    .class-body p { font-size: 1.1rem; line-height: 1.7; margin-bottom: 20px; flex: 1; }
    .class-card-1 .class-body p, .class-card-2 .class-body p { color: rgba(246,244,241,0.82); }
    .class-card-3 .class-body p, .class-card-4 .class-body p { color: var(--mid); }
    .class-meta { display: flex; gap: 12px; flex-wrap: wrap; font-size: 0.82rem; margin-top: auto; }
    .class-meta span {
      padding: 5px 12px; border-radius: 100px;
      background: rgba(255,255,255,0.15); font-size: 0.78rem;
    }
    .class-card-3 .class-meta span, .class-card-4 .class-meta span {
      background: rgba(58,42,28,0.1); color: var(--mid);
    }
    .class-card-1 .class-meta span, .class-card-2 .class-meta span { color: rgba(246,244,241,0.85); }

    /* ─── FREE COURSE ─────────────────────────── */
    #free-course {
      background: linear-gradient(140deg, var(--ink) 0%, #5a3c28 100%);
      position: relative; overflow: hidden;
    }
    #free-course::before {
      content: ''; position: absolute; top: -200px; right: -200px;
      width: 600px; height: 600px; border-radius: 50%;
      background: rgba(255,255,255,0.03); pointer-events: none; z-index: 0;
    }
    #free-course .wrap { position: relative; z-index: 1; }
    .fc-hd { text-align: center; max-width: 680px; margin: 0 auto 52px; }
    .fc-hd h2 { color: #fff; margin-bottom: 16px; }
    .fc-hd p { color: rgba(246,244,241,0.75); margin-bottom: 28px; }
    .fc-pills { list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
    .fc-pills li {
      background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15);
      color: rgba(246,244,241,0.9); padding: 7px 18px; border-radius: 100px;
      font-size: 0.9rem; font-weight: 500;
    }
    .days-grid { display: grid; grid-template-columns: repeat(7,1fr); gap: 12px; margin-bottom: 44px; }
    .day-tile { cursor: pointer;
      background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
      border-radius: 20px; padding: 24px 10px 20px;
      display: flex; flex-direction: column; align-items: center; gap: 8px;
      text-decoration: none; transition: all 0.25s;
    }
    .day-tile:hover {
      background: rgba(255,255,255,0.18); border-color: rgba(255,255,255,0.3);
      transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0,0,0,0.2);
    }
    .day-tile-final { border-color: var(--c3); background: rgba(203,183,158,0.15); }
    .day-num { font-family: 'Lora', serif; font-size: 0.7rem; font-weight: 600; color: var(--c3); letter-spacing: 0.12em; text-transform: uppercase; }
    .day-icon { font-size: 2rem; line-height: 1; }
    .day-lbl { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: #fff; text-align: center; line-height: 1.3; }
    .day-dur { font-size: 0.68rem; color: rgba(246,244,241,0.45); }
    .fc-cta { text-align: center; }
    .fc-cta p { color: rgba(246,244,241,0.45); font-size: 0.9rem; margin-top: 16px; }

    /* ─── TESTIMONIALS ────────────────────────── */
    #testimonials { background: var(--c1); }
    .test-hd { text-align: center; max-width: 800px; margin: 0 auto 52px; }
    .test-hd h2 { color: var(--ink); margin-bottom: 12px; }

    .video-box {
      border-radius: var(--r-lg); overflow: hidden; margin-bottom: 48px;
      position: relative; aspect-ratio: 16/7;
      background: var(--ink); cursor: pointer; display: block;
    }
    .video-box img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; opacity: 0.65; transition: opacity 0.3s; }
    .video-box:hover img { opacity: 0.5; }
    .video-box-overlay {
      position: absolute; inset: 0;
      display: flex; align-items: center; justify-content: center;
      background: linear-gradient(to top, rgba(20,10,4,0.72) 0%, transparent 55%);
    }
    .play-circle {
      width: 80px; height: 80px; border-radius: 50%;
      background: rgba(255,255,255,0.92);
      display: flex; align-items: center; justify-content: center;
      font-size: 1.6rem; color: var(--ink);
      box-shadow: 0 8px 32px rgba(0,0,0,0.3);
      transition: all 0.22s;
    }
    .video-box:hover .play-circle { transform: scale(1.1); background: #fff; }
    .video-box-caption {
      position: absolute; bottom: 0; left: 0; right: 0;
      padding: 14px 20px;
      font-family: 'Lora', serif; font-size: 1.1rem; font-style: italic;
      color: #fff; text-shadow: 0 1px 6px rgba(0,0,0,0.5);
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    }

    .test-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
    .test-card {
      background: var(--c0); border-radius: var(--r-md); padding: 28px 24px;
      border: 1px solid var(--c2);
    }
    .stars { color: var(--c5); font-size: 0.82rem; letter-spacing: 2px; margin-bottom: 14px; }
    .test-card blockquote {
      font-family: 'Lora', serif; font-size: 1.2rem;
      font-style: italic; color: var(--ink); line-height: 1.7; margin-bottom: 16px;
    }
    .test-ba {
      background: var(--c1); border-radius: 10px; padding: 10px 14px;
      font-size: 1rem; color: var(--soft); margin-bottom: 16px;
    }
    .author-name { font-size: 1rem; font-weight: 600; color: var(--ink); }
    .author-role { font-size: 0.8rem; color: var(--soft); }
    .author-av {
      width: 38px; height: 38px; border-radius: 50%; background: var(--c2);
      display: flex; align-items: center; justify-content: center;
      font-family: 'Lora', serif; font-size: 1rem; font-weight: 600; color: var(--c5);
    }
    .author-name { font-size: 0.84rem; font-weight: 600; color: var(--ink); }
    .author-role { font-size: 0.9rem; color: var(--soft); }

    /* ─── YOUTUBE ─────────────────────────────── */
    #youtube { background: var(--c0); }
    .yt-hd { text-align: center; max-width: 800px; margin: 0 auto 48px; }
    .yt-hd h2 { color: var(--ink); margin-bottom: 12px; }
    .yt-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; margin-bottom: 40px; }
    .yt-card { border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--c2); background: var(--c1); }
    .yt-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; background: var(--ink); display: block; }
    .yt-thumb img { width: 100%; height: 100%; object-fit: cover; transition: opacity 0.2s; }
    .yt-thumb:hover img { opacity: 0.85; }
    .yt-play {
      position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
    }
    .yt-play-btn {
      width: 56px; height: 56px; border-radius: 50%;
      background: rgba(255,0,0,0.88); display: flex; align-items: center; justify-content: center;
      color: #fff; font-size: 1.2rem; transition: transform 0.2s;
    }
    .yt-thumb:hover .yt-play-btn { transform: scale(1.12); }
    .yt-info { padding: 14px 16px; }
    .yt-info h4 { font-size: 1.1rem; font-weight: 500; color: var(--ink); line-height: 1.45; margin-bottom: 4px; }
    .yt-info p { font-size: 1rem; color: var(--soft); }
    .yt-cta { text-align: center; }

    /* ─── ABOUT ───────────────────────────────── */
    #about { background: var(--c1); }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
    .about-photos { position: relative; }
    .about-photo-main { border-radius: var(--r-lg); overflow: hidden; }
    .about-photo-main img { width: 100%; height: 560px; object-fit: cover; object-position: top; }
    .about-photo-thumb {
      position: absolute; bottom: -28px; right: -24px;
      width: 160px; height: 160px; border-radius: var(--r-md);
      overflow: hidden; border: 4px solid var(--c0);
      box-shadow: 0 8px 28px rgba(58,42,28,0.14);
    }
    .about-photo-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
    .about-cert-badge {
      position: absolute; top: 28px; right: -20px;
      background: rgba(246,244,241,0.97); backdrop-filter: blur(8px);
      border: 1px solid var(--c2); border-radius: var(--r-sm);
      padding: 14px 18px; box-shadow: 0 4px 20px rgba(58,42,28,0.1);
      text-align: center;
    }
    .about-cert-badge .cert-ico { font-size: 1.5rem; margin-bottom: 4px; }
    .about-cert-badge p { font-size: 0.68rem; color: var(--soft); line-height: 1.4; }
    .about-cert-badge strong { display: block; font-size: 0.82rem; color: var(--ink); margin-bottom: 2px; }
    .about-text { padding-bottom: 28px; }
    .about-text h2 { color: var(--ink); margin-bottom: 8px; }
    .about-text h2 em { color: var(--c5); }
    .namaste { font-family: 'Lora', serif; font-size: 1rem; font-style: italic; color: var(--c5); margin-bottom: 22px; }
    .about-text p { margin-bottom: 14px; }
    .creds { display: flex; flex-direction: column; gap: 10px; margin-top: 26px; }
    .cred { display: flex; align-items: center; gap: 12px; }
    .cred-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c5); flex-shrink: 0; }
    .cred p { font-size: 1.2rem; margin: 0; }

    /* ─── CONTACT ─────────────────────────────── */
    #contact { background: var(--ink); }
    .contact-hd { text-align: center; max-width: 560px; margin: 0 auto 52px; }
    .contact-hd .label { color: var(--c3); }
    .contact-hd h2 { color: #fff; }
    .contact-hd p { color: rgba(246,244,241,0.65); font-size: 1rem; }
    .contact-cta-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
    .contact-cta-card {
      border-radius: var(--r-lg); padding: 44px 32px;
      display: flex; flex-direction: column; align-items: center; text-align: center; gap: 14px;
      transition: transform 0.25s, box-shadow 0.25s;
      text-decoration: none;
    }
    .contact-cta-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(0,0,0,0.3); }
    .contact-cta-zalo { background: linear-gradient(135deg, #7a5c42 0%, #9F7F63 100%); }
    .contact-cta-fb   { background: linear-gradient(135deg, #5a3c28 0%, #7a5c42 100%); }
    .contact-cta-yt   { background: linear-gradient(135deg, #CBB79E 0%, #B69A7A 100%); }
    .cta-icon { font-size: 2.4rem; line-height: 1; }
    .cta-label { font-size: 1.15rem; font-weight: 600; color: #fff; }
    .cta-sub { font-size: 1.1rem; color: rgba(255,255,255,0.72); }
    .contact-cta-yt .cta-label { color: var(--ink); }
    .contact-cta-yt .cta-sub { color: rgba(58,42,28,0.65); }

    /* ─── VIDEO MODAL ─────────────────────────── */
    .modal-backdrop {
      display: none; position: fixed; inset: 0; z-index: 500;
      background: rgba(10,5,2,0.88); backdrop-filter: blur(6px);
      align-items: center; justify-content: center;
    }
    .modal-backdrop.open { display: flex; }
    .modal-box {
      position: relative; width: 90%; max-width: 860px;
      border-radius: var(--r-lg); overflow: hidden;
      box-shadow: 0 32px 80px rgba(0,0,0,0.5);
    }
    .modal-video { position: relative; padding-top: 56.25%; background: #000; }
    .modal-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: none; }
    .modal-close {
      position: absolute; top: -42px; right: 0;
      width: 32px; height: 32px; border-radius: 50%;
      background: rgba(255,255,255,0.15); border: none; cursor: pointer;
      color: #fff; font-size: 1.1rem; display: flex; align-items: center; justify-content: center;
      transition: background 0.2s;
    }
    .modal-close:hover { background: rgba(255,255,255,0.3); }

    /* ─── FOOTER ──────────────────────────────── */
    footer { background: var(--ink); color: rgba(246,244,241,0.7); padding: 64px 0 32px; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
    .footer-brand img { height: 52px; margin-bottom: 16px; border-radius: 50%; }
    .footer-brand p { font-size: 1.2rem; line-height: 1.8; max-width: 270px; margin-bottom: 22px; color: rgba(246,244,241,0.92); }
    .socials { display: flex; gap: 10px; }
    .soc {
      width: 34px; height: 34px; border-radius: 50%;
      background: rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: center;
      font-size: 0.8rem; color: rgba(246,244,241,0.8); transition: background 0.2s;
    }
    .soc:hover { background: rgba(255,255,255,0.22); }
    .footer-col h4 { font-size: 1.2rem; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(246,244,241,0.4); margin-bottom: 18px; }
    .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
    .footer-col ul a { font-size: 1.2rem; color: rgba(246,244,241,0.7); transition: color 0.2s; }
    .footer-col ul a:hover { color: #fff; }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; text-align: center; font-size: 1.2rem; color: rgba(246,244,241,0.35); }

    /* ─── ZALO FLOAT ──────────────────────────── */
    .zalo-float {
      position: fixed; bottom: 28px; right: 28px; z-index: 200;
      display: flex; flex-direction: column; align-items: center; gap: 6px;
    }
    .zalo-btn {
      width: 52px; height: 52px; border-radius: 50%; background: #0068ff;
      display: flex; align-items: center; justify-content: center;
      box-shadow: 0 4px 16px rgba(0,104,255,0.4);
      color: #fff; font-weight: 700; font-size: 1rem; font-family: 'Source Sans 3', sans-serif;
      animation: zpulse 2.5s ease-in-out infinite;
    }
    @keyframes zpulse { 0%,100%{box-shadow:0 4px 16px rgba(0,104,255,.4)} 50%{box-shadow:0 4px 28px rgba(0,104,255,.7)} }
    .zalo-tip { background: rgba(58,42,28,0.88); color: #fff; font-size: 0.7rem; padding: 3px 10px; border-radius: 100px; white-space: nowrap; }

    /* ─── RESPONSIVE ──────────────────────────── */
    @media (max-width: 1100px) {
      .method-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    }
    @media (max-width: 960px) {
      .hero-content { padding: 48px 28px; }
      .pain-grid, .about-grid { grid-template-columns: 1fr; gap: 40px; }
      .contact-cta-row { grid-template-columns: 1fr; }
      .method-grid { grid-template-columns: 1fr 1fr; }
      .classes-grid, .yt-grid, .test-grid { grid-template-columns: 1fr; }
      .video-box { aspect-ratio: 16/9; }
      .test-hd { margin-bottom: 32px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .days-grid { grid-template-columns: repeat(4,1fr); }
      .nav-links { display: none; }
      .nav-links.open {
        display: flex; flex-direction: column; align-items: flex-start;
        position: absolute; top: 80px; left: 0; right: 0;
        background: rgba(246,244,241,0.97); backdrop-filter: blur(14px);
        padding: 20px 28px 28px; gap: 18px;
        border-bottom: 1px solid var(--c2);
        box-shadow: 0 8px 24px rgba(58,42,28,0.08);
      }
      .nav-links.open .nav-cta { align-self: flex-start; }
      .hamburger { display: flex; }
    }
    @media (max-width: 640px) {
      section { padding: 64px 0; }
      .method-grid { grid-template-columns: 1fr; }
      .pain-cards { grid-template-columns: 1fr; }
      .days-grid { grid-template-columns: 1fr 1fr; }
      .day-tile-final { grid-column: 1 / -1; }
      .hero-stats { gap: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .about-photo-thumb { display: none; }
    }


/* ─── STUDENT COURSE ACCESS MVP ───────────────── */
.app-page { padding-top: 80px; min-height: 70vh; }
.app-hero { padding: 92px 0 48px; background: linear-gradient(135deg, var(--c0) 0%, var(--c1) 100%); border-bottom: 1px solid var(--c2); }
.app-hero .narrow { max-width: 820px; }
.app-hero h1 { margin-bottom: 14px; }
.course-hero h1 { font-size: clamp(2.6rem, 5vw, 4.6rem); line-height: 1.05; }
.app-section { padding: 64px 0 88px; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; align-items: start; }
.app-grid.two { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.login-grid { max-width: 520px; margin: 0 auto; }
.app-card { background: #fff; border: 1px solid var(--c2); border-radius: var(--r-md); padding: 28px; box-shadow: 0 10px 34px rgba(58,42,28,0.06); }
.app-card h2, .app-card h3 { margin-bottom: 12px; }
.app-page h2 { font-size: clamp(1.55rem, 2.4vw, 2.35rem); line-height: 1.16; }
.app-card p { font-size: 1rem; margin-bottom: 18px; }
.form-card { display: grid; gap: 16px; }
.form-card label { display: grid; gap: 7px; color: var(--mid); font-weight: 600; }
.form-card input, .form-card select, .form-card textarea { width: 100%; border: 1px solid var(--c2); border-radius: 14px; padding: 12px 14px; background: var(--c0); color: var(--ink); font: inherit; }
.form-card input:focus, .form-card select:focus, .form-card textarea:focus { outline: 2px solid rgba(159,127,99,0.22); border-color: var(--c5); }
.app-message { grid-column: 1 / -1; margin: 12px 0; padding: 12px 16px; border-radius: 14px; font-weight: 600; display: none; }
.app-message:not(:empty) { display: block; }
.app-message.info { background: var(--c1); color: var(--mid); }
.app-message.success { background: #e7f6e7; color: #256331; }
.app-message.error { background: #fde8e4; color: #8d2d1f; }
.lesson-list { display: grid; gap: 18px; }
.lesson-layout { display: grid; grid-template-columns: minmax(240px, 360px) 1fr; gap: 24px; align-items: start; }
.lesson-nav, .lesson-player { background: #fff; border: 1px solid var(--c2); border-radius: var(--r-md); padding: 20px; box-shadow: 0 10px 34px rgba(58,42,28,0.06); }
.lesson-nav { position: sticky; top: 100px; display: grid; gap: 10px; }
.lesson-nav h2 { margin-bottom: 8px; font-size: clamp(1.35rem, 1.9vw, 1.85rem); white-space: nowrap; }
.lesson-nav-item { display: grid; grid-template-columns: 34px 1fr; gap: 10px; align-items: center; width: 100%; border: 1px solid var(--c2); border-radius: 14px; padding: 12px; background: var(--c0); color: var(--mid); text-align: left; cursor: pointer; font: inherit; }
.lesson-nav-item span { width: 34px; height: 34px; border-radius: 999px; display: flex; align-items: center; justify-content: center; background: var(--c1); color: var(--ink); font-weight: 700; }
.lesson-nav-item strong { font-size: 0.96rem; line-height: 1.35; }
.lesson-nav-item.active { border-color: var(--c5); background: #fff; box-shadow: 0 8px 22px rgba(58,42,28,0.08); }
.lesson-nav-item.completed span { background: #e7f6e7; color: #256331; }
.lesson-nav-item:disabled { cursor: not-allowed; opacity: 0.55; }
.lesson-player { display: block; }
.lesson-player-title { font-size: clamp(1.45rem, 2vw, 2.05rem); line-height: 1.16; margin-bottom: 18px; }
.lesson-player .lesson-image { max-width: 520px; margin-bottom: 20px; }
.lesson-controls { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; margin: 20px 0; }
.lesson-controls [data-prev-lesson] { justify-self: start; }
.lesson-controls [data-next-lesson] { justify-self: end; }
.lesson-complete-action { justify-self: center; }
.lesson-complete-badge { display: inline-flex; align-items: center; min-height: 48px; padding: 0 18px; border-radius: 999px; background: #e7f6e7; color: #256331; font-weight: 700; }
.lesson-card { display: grid; grid-template-columns: minmax(160px, 280px) 1fr; gap: 20px; align-items: center; background: #fff; border: 1px solid var(--c2); border-radius: var(--r-md); padding: 18px; }
.lesson-image { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 16px; background: var(--c1); }
.lesson-video { margin: 18px 0 10px; aspect-ratio: 16 / 9; overflow: hidden; border-radius: 16px; background: var(--ink); }
.lesson-video iframe { width: 100%; height: 100%; border: 0; display: block; }
.lesson-tags { color: var(--soft); font-size: 0.92rem; line-height: 1.55; word-break: break-word; }
.lesson-video-placeholder { aspect-ratio: 16 / 9; border-radius: 16px; background: linear-gradient(135deg, var(--ink), var(--c6)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.simple-list { list-style: none; display: grid; gap: 12px; }
.simple-list li { padding: 12px 0; border-bottom: 1px solid var(--c1); color: var(--mid); }
.admin-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 24px; align-items: start; }
.admin-sidebar { position: sticky; top: 100px; display: grid; gap: 10px; background: #fff; border: 1px solid var(--c2); border-radius: var(--r-md); padding: 12px; box-shadow: 0 10px 34px rgba(58,42,28,0.06); }
.admin-nav-item { width: 100%; border: 1px solid transparent; border-radius: 14px; padding: 13px 14px; background: transparent; color: var(--mid); cursor: pointer; font: inherit; font-weight: 700; text-align: left; }
.admin-nav-item:hover, .admin-nav-item.active { background: var(--c0); border-color: var(--c2); color: var(--ink); }
.admin-main { min-width: 0; }
.admin-view { display: grid; gap: 20px; }
.admin-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 4px; }
.admin-toolbar h2 { margin: 0; }
.admin-toolbar .label { margin-bottom: 6px; }
.table-card { overflow-x: auto; padding: 0; }
.admin-table { width: 100%; min-width: 620px; border-collapse: collapse; }
.admin-table th, .admin-table td { padding: 15px 18px; border-bottom: 1px solid var(--c1); text-align: left; color: var(--mid); }
.admin-table th { color: var(--ink); font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase; }
.admin-table tr:last-child td { border-bottom: 0; }
.admin-course-card { display: grid; gap: 8px; width: 100%; min-height: 210px; border: 1px solid var(--c2); border-radius: var(--r-md); padding: 24px; background: #fff; color: inherit; cursor: pointer; text-align: left; box-shadow: 0 10px 34px rgba(58,42,28,0.06); transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s; }
.admin-course-card:hover, .admin-course-card.active { border-color: var(--c5); transform: translateY(-2px); box-shadow: 0 14px 34px rgba(58,42,28,0.1); }
.admin-course-card h3 { margin: 0; }
.admin-course-card p { margin: 0; font-size: 1rem; }
.admin-wide { grid-column: 1 / -1; }
.lesson-admin-grid { display: grid; grid-template-columns: minmax(280px, 420px) 1fr; gap: 28px; align-items: start; }
.lesson-admin-list li { display: grid; gap: 8px; }
.lesson-admin-actions { display: flex; flex-wrap: wrap; gap: 10px; }
button.btn:disabled { opacity: 0.6; cursor: not-allowed; }
@media (max-width: 900px) { .lesson-layout { grid-template-columns: 1fr; } .lesson-nav { position: static; } }
@media (max-width: 760px) { .lesson-controls { grid-template-columns: 1fr; } .lesson-controls [data-prev-lesson], .lesson-controls [data-next-lesson], .lesson-complete-action { justify-self: stretch; } }
@media (max-width: 700px) { .lesson-card, .lesson-admin-grid, .admin-layout { grid-template-columns: 1fr; } .app-grid.two { grid-template-columns: 1fr; } .admin-sidebar { position: static; } .admin-toolbar { align-items: flex-start; flex-direction: column; } }