:root {
    --gold: #c9a84c;
    --gold-light: #e8c97a;
    --gold-pale: #f5e9c8;
    --dark: #0f0e0b;
    --dark2: #1a1914;
    --dark3: #242318;
    --text: #e8e4d8;
    --text-muted: #9a9280;
    --red: #c0392b;
    --green: #27ae60;
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--dark);
    color: var(--text);
    font-family: 'Be Vietnam Pro', sans-serif;
    font-weight: 400;
    line-height: 1.7;
    overflow-x: hidden;
  }

  /* ── NOISE TEXTURE OVERLAY ── */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
  }

  /* ── HERO ── */
  .hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px 60px;
    overflow: hidden;
  }

  .hero-bg {
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse 80% 60% at 50% 0%, rgba(201,168,76,0.18) 0%, transparent 70%),
      radial-gradient(ellipse 50% 40% at 20% 80%, rgba(201,168,76,0.08) 0%, transparent 60%),
      linear-gradient(180deg, #0f0e0b 0%, #1a1710 100%);
    z-index: 0;
  }

  .hero-deco {
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 120px;
    background: linear-gradient(180deg, transparent, var(--gold));
    opacity: 0.5;
  }

  .badge {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(201,168,76,0.12);
    border: 1px solid rgba(201,168,76,0.3);
    border-radius: 100px;
    padding: 6px 18px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gold-light);
    margin-bottom: 28px;
    animation: fadeUp 0.8s ease both;
  }

  .badge::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--gold);
    border-radius: 50%;
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0%,100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(1.4); }
  }

  .hero h1 {
    position: relative;
    z-index: 1;
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: #fff;
    max-width: 780px;
    animation: fadeUp 0.8s 0.15s ease both;
  }

  .hero h1 span {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 50%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .hero-sub {
    position: relative;
    z-index: 1;
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 520px;
    margin: 20px auto 0;
    animation: fadeUp 0.8s 0.3s ease both;
  }

  .hero-stats {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 40px;
    margin-top: 48px;
    animation: fadeUp 0.8s 0.45s ease both;
  }

  .stat { text-align: center; }
  .stat-num {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--gold-light);
    line-height: 1;
  }
  .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-top: 4px;
  }

  .stat-divider {
    width: 1px;
    background: rgba(201,168,76,0.2);
    align-self: stretch;
  }

  .scroll-hint {
    position: absolute;
    z-index: 1;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    animation: fadeUp 1s 0.9s ease both;
  }

  .scroll-arrow {
    width: 20px; height: 20px;
    border-right: 1px solid var(--gold);
    border-bottom: 1px solid var(--gold);
    transform: rotate(45deg);
    animation: bounce 1.5s infinite;
  }

  @keyframes bounce {
    0%,100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(5px); }
  }

  /* ── SECTION BASE ── */
  section { position: relative; z-index: 1; }

  .container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
  }

  .section-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 12px;
  }

  .section-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 700;
    line-height: 1.2;
    color: #fff;
    margin-bottom: 16px;
  }

  .section-desc {
    color: var(--text-muted);
    max-width: 540px;
    font-size: 0.95rem;
  }

  /* ── WHY ── */
  .why {
    padding: 100px 0 80px;
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark2) 100%);
  }

  .why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2px;
    margin-top: 56px;
    border: 1px solid rgba(201,168,76,0.15);
  }

  .why-card {
    background: var(--dark2);
    padding: 36px 32px;
    transition: background 0.3s;
    position: relative;
    overflow: hidden;
  }

  .why-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    transform: scaleX(0);
    transition: transform 0.4s;
  }

  .why-card:hover { background: var(--dark3); }
  .why-card:hover::after { transform: scaleX(1); }

  .why-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    display: block;
  }

  .why-card h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 10px;
  }

  .why-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.7;
  }

  /* ── PRICING ── */
  .pricing {
    padding: 80px 0 100px;
  }

  .pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 56px;
  }

  .price-card {
    background: var(--dark2);
    border: 1px solid rgba(201,168,76,0.12);
    border-radius: 4px;
    padding: 40px 32px;
    position: relative;
    transition: transform 0.3s, border-color 0.3s;
  }

  .price-card:hover {
    transform: translateY(-6px);
    border-color: rgba(201,168,76,0.4);
  }

  .price-card.featured {
    border-color: var(--gold);
    background: linear-gradient(135deg, var(--dark2) 0%, rgba(201,168,76,0.08) 100%);
  }

  .featured-tag {
    position: absolute;
    top: -1px; right: 24px;
    background: var(--gold);
    color: var(--dark);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 12px;
    border-radius: 0 0 6px 6px;
  }

  .price-subject {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 8px;
  }

  .price-name {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: 24px;
  }

  .price-amount {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 28px;
  }

  .price-num {
    font-family: 'Playfair Display', serif;
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--gold-light);
    line-height: 1;
  }

  .price-unit {
    font-size: 0.85rem;
    color: var(--text-muted);
  }

  .price-features {
    list-style: none;
    margin-bottom: 32px;
  }

  .price-features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.88rem;
    color: var(--text-muted);
    padding: 7px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
  }

  .price-features li::before {
    content: '✓';
    color: var(--gold);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 1px;
  }

  /* ── FORM SECTION ── */
  .form-section {
    padding: 80px 0 120px;
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark2) 100%);
  }

  .form-wrap {
    max-width: 680px;
    margin: 56px auto 0;
    background: var(--dark2);
    border: 1px solid rgba(201,168,76,0.18);
    border-radius: 4px;
    padding: 52px 48px;
    position: relative;
  }

  .form-wrap::before {
    content: '';
    position: absolute;
    top: 0; left: 48px; right: 48px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
  }

  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .form-group {
    margin-bottom: 24px;
  }

  .form-group.full { grid-column: 1 / -1; }

  label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--gold-light);
    margin-bottom: 8px;
  }

  label span {
    color: var(--red);
    margin-left: 2px;
  }

  input, select, textarea {
    width: 100%;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(201,168,76,0.2);
    border-radius: 3px;
    padding: 12px 16px;
    color: var(--text);
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.92rem;
    transition: border-color 0.25s, background 0.25s;
    outline: none;
    -webkit-appearance: none;
  }

  input:focus, select:focus, textarea:focus {
    border-color: var(--gold);
    background: rgba(201,168,76,0.05);
  }

  input::placeholder, textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
  }

  select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23c9a84c' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
  }

  select option {
    background: var(--dark2);
    color: var(--text);
  }

  /* Upload area */
  .upload-area {
    border: 1px dashed rgba(201,168,76,0.3);
    border-radius: 3px;
    padding: 28px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.25s, background 0.25s;
    position: relative;
  }

  .upload-area:hover {
    border-color: var(--gold);
    background: rgba(201,168,76,0.04);
  }

  .upload-area input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
    border: none;
    padding: 0;
    background: none;
  }

  .upload-icon { font-size: 1.8rem; margin-bottom: 8px; }

  .upload-text {
    font-size: 0.88rem;
    color: var(--text-muted);
  }

  .upload-text strong { color: var(--gold-light); }

  #upload-preview {
    margin-top: 10px;
    font-size: 0.82rem;
    color: var(--green);
    display: none;
  }

  /* CK Info box */
  .ck-box {
    background: rgba(201,168,76,0.07);
    border: 1px solid rgba(201,168,76,0.2);
    border-radius: 3px;
    padding: 20px 24px;
    margin-bottom: 28px;
  }

  .ck-box-title {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 12px;
  }

  .ck-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    font-size: 0.88rem;
  }

  .ck-row:last-child { border-bottom: none; }
  .ck-key { color: var(--text-muted); }
  .ck-val { color: #fff; font-weight: 500; }
  .ck-val.highlight { color: var(--gold-light); font-family: 'Playfair Display', serif; font-size: 1rem; }

  /* Submit button */
  .btn-submit {
    width: 100%;
    background: linear-gradient(135deg, #b8942a 0%, var(--gold) 50%, #b8942a 100%);
    background-size: 200% auto;
    border: none;
    border-radius: 3px;
    padding: 16px 24px;
    color: var(--dark);
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background-position 0.4s, transform 0.2s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
  }

  .btn-submit:hover {
    background-position: right center;
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(201,168,76,0.35);
  }

  .btn-submit:active { transform: translateY(0); }

  .btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
  }

  /* Success state */
  .success-msg {
    display: none;
    text-align: center;
    padding: 40px 20px;
    animation: fadeUp 0.5s ease both;
  }

  .success-icon {
    font-size: 3rem;
    margin-bottom: 16px;
  }

  .success-msg h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.6rem;
    color: var(--gold-light);
    margin-bottom: 10px;
  }

  .success-msg p {
    color: var(--text-muted);
    font-size: 0.92rem;
  }

  /* Form note */
  .form-note {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 16px;
  }

  .form-note a { color: var(--gold); text-decoration: none; }

  /* Error */
  .field-error {
    font-size: 0.78rem;
    color: #e74c3c;
    margin-top: 5px;
    display: none;
  }

  /* ── FOOTER ── */
  footer {
    border-top: 1px solid rgba(201,168,76,0.1);
    padding: 40px 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.82rem;
  }

  footer a { color: var(--gold); text-decoration: none; }

  /* ── ANIMATIONS ── */
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }

  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* ── RESPONSIVE ── */
  @media (max-width: 600px) {
    .form-wrap { padding: 36px 24px; }
    .form-row { grid-template-columns: 1fr; }
    .hero-stats { gap: 24px; }
    .stat-num { font-size: 1.5rem; }
  }

  /* ── DEMO SECTION ── */
  .demo-section {
    padding: 80px 0 60px;
    background: linear-gradient(180deg, var(--dark2) 0%, var(--dark) 100%);
    position: relative; z-index: 1;
  }
  .demo-filter {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 28px;
    flex-wrap: wrap;
  }
  .filter-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(201,168,76,0.2);
    color: var(--text-muted);
    padding: 7px 20px;
    border-radius: 100px;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s;
  }
  .filter-btn:hover, .filter-btn.active {
    background: rgba(201,168,76,0.12);
    border-color: var(--gold);
    color: var(--gold-light);
  }
  .demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
    gap: 20px;
    margin-top: 40px;
  }
  .demo-card {
    background: var(--dark2);
    border: 1px solid rgba(201,168,76,0.12);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
    text-decoration: none;
    display: flex;
    flex-direction: column;
  }
  .demo-card:hover {
    transform: translateY(-6px);
    border-color: rgba(201,168,76,0.5);
    box-shadow: 0 12px 36px rgba(0,0,0,0.45);
  }
  .demo-card.hidden { display: none; }
  .demo-thumb {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
    object-position: top;
    display: block;
    border-bottom: 1px solid rgba(201,168,76,0.1);
  }
  .demo-thumb-placeholder {
    width: 100%;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--dark3), #2a2920);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 10px;
    border-bottom: 1px solid rgba(201,168,76,0.1);
  }
  .demo-info {
    padding: 12px 14px 16px;
    flex: 1; display: flex; flex-direction: column; gap: 5px;
  }
  .demo-subject {
    font-size: 0.68rem; font-weight: 600;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--gold);
  }
  .demo-name {
    font-family: 'Playfair Display', serif;
    font-size: 0.88rem; color: #fff; line-height: 1.4;
  }
  .demo-meta {
    font-size: 0.74rem; color: var(--text-muted);
    margin-top: auto; padding-top: 6px;
  }
  .demo-btn {
    display: inline-flex; align-items: center; gap: 5px;
    font-size: 0.75rem; font-weight: 600;
    color: var(--gold-light); margin-top: 6px;
    transition: gap 0.2s;
  }
  .demo-btn::after { content: '→'; transition: transform 0.2s; }
  .demo-card:hover .demo-btn::after { transform: translateX(4px); }
  .btn-order-now {
    display: inline-block;
    margin-top: 20px;
    background: linear-gradient(135deg, #b8942a, var(--gold), #b8942a);
    background-size: 200% auto;
    color: var(--dark);
    font-weight: 700; font-size: 0.92rem;
    padding: 13px 32px; border-radius: 100px;
    text-decoration: none;
    transition: background-position 0.3s, transform 0.2s, box-shadow 0.3s;
    box-shadow: 0 4px 20px rgba(201,168,76,0.3);
  }
  .btn-order-now:hover {
    background-position: right center;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(201,168,76,0.5);
  }
  /* Modal */
  .demo-modal {
    display: none; position: fixed; inset: 0; z-index: 10000;
    background: rgba(0,0,0,0.88);
    backdrop-filter: blur(6px);
    align-items: center; justify-content: center; padding: 16px;
  }
  .demo-modal.open { display: flex; animation: fadeIn 0.2s ease; }
  .demo-modal-inner {
    background: var(--dark2);
    border: 1px solid rgba(201,168,76,0.25);
    border-radius: 10px;
    width: 100%; max-width: 920px; height: 88vh;
    display: flex; flex-direction: column; overflow: hidden;
    animation: slideUp 0.28s ease;
  }
  .demo-modal-header {
    display: flex; align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    border-bottom: 1px solid rgba(201,168,76,0.12);
    flex-shrink: 0;
  }
  .demo-modal-title {
    font-family: 'Playfair Display', serif;
    font-size: 0.95rem; color: var(--gold-light);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    max-width: 70%;
  }
  .demo-modal-actions { display: flex; align-items: center; gap: 10px; }
  .demo-modal-link {
    font-size: 0.75rem; color: var(--gold); text-decoration: none;
    border: 1px solid rgba(201,168,76,0.3); padding: 4px 12px;
    border-radius: 4px; transition: background 0.2s; white-space: nowrap;
  }
  .demo-modal-link:hover { background: rgba(201,168,76,0.1); }
  .demo-modal-close {
    width: 30px; height: 30px; background: rgba(255,255,255,0.06);
    border: none; border-radius: 50%; color: var(--text);
    font-size: 1rem; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s; flex-shrink: 0;
  }
  .demo-modal-close:hover { background: rgba(255,255,255,0.14); }
  .demo-modal-frame { flex: 1; width: 100%; border: none; background: #fff; }
  @media (max-width: 600px) {
    .demo-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .demo-modal-inner { height: 92vh; }
    .demo-modal-title { font-size: 0.8rem; }
  }

  /* ── ZALO FLOAT ── */
  .zalo-float {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
  }

  .zalo-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #0068ff;
    color: #fff;
    text-decoration: none;
    border-radius: 100px;
    padding: 12px 20px 12px 14px;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.88rem;
    font-weight: 600;
    box-shadow: 0 6px 24px rgba(0,104,255,0.45);
    transition: transform 0.25s, box-shadow 0.25s;
    animation: zaloEntrance 0.6s 1s ease both;
  }

  .zalo-btn:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 10px 32px rgba(0,104,255,0.6);
  }

  .zalo-icon {
    width: 32px;
    height: 32px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
    font-weight: 900;
    color: #0068ff;
    font-family: Arial, sans-serif;
    letter-spacing: -0.5px;
  }

  .zalo-pulse {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 14px;
    height: 14px;
    background: #ff3b30;
    border-radius: 50%;
    border: 2px solid #fff;
    animation: pingDot 1.8s infinite;
  }

  .zalo-tooltip {
    background: rgba(15,14,11,0.92);
    border: 1px solid rgba(0,104,255,0.3);
    color: var(--text);
    font-size: 0.78rem;
    padding: 7px 14px;
    border-radius: 6px;
    white-space: nowrap;
    backdrop-filter: blur(6px);
    animation: fadeUp 0.4s ease both;
    pointer-events: none;
  }

  @keyframes zaloEntrance {
    from { opacity: 0; transform: translateY(20px) scale(0.85); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
  }

  @keyframes pingDot {
    0%,100% { transform: scale(1); opacity: 1; }
    50%     { transform: scale(1.5); opacity: 0.5; }
  }

  @media (max-width: 600px) {
    .zalo-float { bottom: 18px; right: 16px; }
    .zalo-btn { padding: 11px 16px 11px 12px; font-size: 0.82rem; }
  }