/* ============================================================
   CEO AI OS — AI Native Lab · Design System (v2 overhaul)
   Concept "Đất nung & ống nghiệm": gốm Việt ấm + sắc ngọc phòng lab.
   Quy tắc màu: Cream + Ink + 1–2 màu nhấn / ấn phẩm. Không xanh dương công nghệ.
   Type: Be Vietnam Pro (mọi tiếng Việt + body) · Bricolage Grotesque (CHỈ display/số tiếng Anh).
   Signature: pill button, ink linework, "stamp" card (viền mực + bóng đặc lệch, không blur).
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=Bricolage+Grotesque:opsz,wght@12..96,500;12..96,600;12..96,700;12..96,800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* ---- Brand palette ---- */
  --cream:       #f5efd9;
  --cream-50:    #fbf8ee;
  --cream-card:  #fffdf7;
  --cream-200:   #ece3c5;
  --cream-300:   #ded2ae;
  --ink:         #090909;
  --ink-700:     #111111;
  --ink-soft:    #171717;
  --ink-500:     #1b1b1b;
  --muted:       #1f1f1f;
  --orange:      #f47c30;
  --orange-600:  #d9651c;
  --orange-100:  #fbe0cd;
  --green:       #9bc990;
  --green-600:   #6fa463;
  --green-700:   #5f8f57;
  --green-100:   #e2efdd;
  --yellow:      #f4b82e;
  --yellow-600:  #d89a14;
  --yellow-100:  #fbebc4;
  --dark:        #141a22;
  --dark-card:   #1b232e;
  --line:        #e2d8bd;
  --line-soft:   #efe7d0;
  --on-dark:     #fcfcfc;
  --on-dark-strong: #f5f5f5;

  /* ---- Type ---- */
  --font-body: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-en:   'Bricolage Grotesque', 'Be Vietnam Pro', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;

  /* ---- Radii ---- */
  --r-xs: 6px;
  --r: 14px;
  --r-lg: 20px;
  --r-xl: 26px;
  --r-pill: 999px;

  /* ---- Shadows: warm, low, tinted with ink — never bluish ---- */
  --shadow:    0 2px 6px rgba(31, 41, 55, .07), 0 14px 34px -18px rgba(31, 41, 55, .2);
  --shadow-lg: 0 24px 60px -26px rgba(31, 41, 55, .34);
  --stamp:     5px 5px 0 var(--ink);          /* signature stamped offset */
  --stamp-sm:  3px 3px 0 var(--ink);
  --stamp-soft: 4px 4px 0 rgba(31, 41, 55, .14);

  /* ---- Layout / motion ---- */
  --wrap: 1140px;
  --section-y: clamp(40px, 5vw, 76px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink-700);
  background: var(--cream);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(244, 184, 46, .4); }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; border-radius: 4px; }

/* ============================================================ Layout */
.wrap { width: min(100% - 40px, var(--wrap)); margin-inline: auto; }
.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(40px, 6vw, 76px); }
.section--alt { background: var(--cream-50); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.section--dark {
  color: var(--on-dark);
  background-color: var(--dark);
  background-image: radial-gradient(rgba(245, 239, 217, .045) 1.1px, transparent 1.2px);
  background-size: 26px 26px;
}
.section--dark .lead, .section--dark .muted { color: var(--on-dark); }
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--on-dark-strong); }
.center { text-align: center; }
.maxw-680 { max-width: 680px; }
.maxw-760 { max-width: 760px; }
.mx-auto { margin-inline: auto; }
.stack > * + * { margin-top: 1rem; }
.divider { height: 1px; background: var(--line); border: 0; margin: 0; }
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }

/* ============================================================ Typography */
h1, h2, h3, h4 {
  font-family: var(--font-body);     /* Vietnamese → Be Vietnam Pro */
  font-weight: 800; line-height: 1.12; letter-spacing: -.02em;
  color: var(--ink); margin: 0 0 .5em; text-wrap: balance;
}
h1 { font-size: clamp(2.15rem, 5.4vw, 3.7rem); line-height: 1.05; }
h2 { font-size: clamp(1.7rem, 3.7vw, 2.65rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.42rem); letter-spacing: -.01em; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1rem; }
.font-en { font-family: var(--font-en); letter-spacing: -.02em; font-weight: 800; }
.lead { font-size: clamp(1.08rem, 1.7vw, 1.3rem); color: var(--ink-soft); line-height: 1.6; font-weight: 400; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.accent { color: var(--orange-600); font-weight: 600; }
.hot { color: var(--yellow); }
mark, .hl {
  background: linear-gradient(180deg, transparent 56%, rgba(244, 184, 46, .55) 56%);
  padding: 0 .08em; color: inherit; border-radius: 2px;
}

/* Eyebrow — pill overline with a small flask-jade mark */
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .76rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--orange-600);
  padding: 7px 15px 7px 13px; border: 1.5px solid var(--line);
  border-radius: var(--r-pill); background: var(--cream-50);
}
.eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--green); box-shadow: 0 0 0 3px rgba(155, 201, 144, .28);
}
.section--dark .eyebrow {
  color: var(--yellow); background: rgba(255, 255, 255, .05); border-color: rgba(255, 255, 255, .14);
}
.section--dark .eyebrow::before { background: var(--yellow); box-shadow: 0 0 0 3px rgba(244, 184, 46, .22); }

/* ============================================================ Buttons (stamped pills) */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-family: var(--font-body); font-weight: 700; font-size: 1rem; line-height: 1.2;
  padding: 13px 24px; border-radius: var(--r-pill); border: 1.5px solid transparent;
  cursor: pointer; text-align: center; white-space: nowrap;
  transition: transform .16s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease), color .2s var(--ease);
}
.btn-lg { padding: 16px 32px; font-size: 1.06rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

.btn-primary { background: var(--orange); color: #fff; border-color: var(--ink); box-shadow: var(--stamp-sm); }
.btn-primary:hover { background: var(--orange-600); transform: translate(-1px, -1px); box-shadow: var(--stamp); }
.btn-primary:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }

.btn-ghost { background: transparent; border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--cream); transform: translateY(-2px); }
.btn-ghost:active { transform: translateY(0); }

.btn-ink { background: var(--ink); color: var(--cream); border-color: var(--ink); }
.btn-ink:hover { background: #0f1620; transform: translateY(-2px); }

/* Buttons on dark surfaces */
.section--dark .btn-primary, .buy-panel .btn-primary { border-color: transparent; box-shadow: 0 12px 26px -12px rgba(244, 124, 48, .9); }
.section--dark .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -12px rgba(244, 124, 48, 1); }
.section--dark .btn-ghost { border-color: rgba(245, 239, 217, .55); color: var(--cream); }
.section--dark .btn-ghost:hover { background: var(--cream); color: var(--ink); }

/* ============================================================ Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(245, 239, 217, .8); backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; gap: 18px; height: 70px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-en); font-weight: 800; font-size: 1.12rem; letter-spacing: -.01em; color: var(--ink); }
.brand img, .brand svg { width: 30px; height: auto; }
.nav__links { display: flex; gap: 26px; margin-left: auto; align-items: center; }
.nav__links a { font-size: .96rem; font-weight: 600; color: var(--ink-soft); transition: color .15s var(--ease); }
.nav__links a:hover { color: var(--ink); }
.nav__links a.btn:hover { color: #fff; }
.nav__cta { margin-left: 4px; }
.nav__burger { display: none; margin-left: auto; background: none; border: 0; font-size: 1.5rem; cursor: pointer; color: var(--ink); line-height: 1; }

/* ============================================================ Hero */
.hero {
  padding-block: clamp(40px, 5vw, 72px);
  position: relative; overflow: hidden;
  background-image: radial-gradient(rgba(31, 41, 55, .05) 1.1px, transparent 1.2px);
  background-size: 24px 24px;
}
.hero__grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero h1 { margin-bottom: .3em; }
.hero .lead { margin-bottom: 0; max-width: 40ch; }
.hero .btn-row { margin-top: 30px; }
.hero__badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; font-size: .85rem; font-weight: 600;
  padding: 8px 15px; border-radius: var(--r-pill); background: var(--cream-50);
  border: 1.5px solid var(--line); color: var(--ink-soft);
}
.badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--green); flex: none; }

/* Hero art — dark "stamp" card holding the flask, with a floating jade pill */
.hero__art { display: flex; justify-content: center; }
.hero-card {
  position: relative; width: min(380px, 100%);
  background: var(--dark);
  background-image: radial-gradient(rgba(245, 239, 217, .06) 1.1px, transparent 1.2px);
  background-size: 22px 22px;
  border: 1.5px solid var(--ink); border-radius: var(--r-xl);
  box-shadow: var(--stamp); padding: 34px 30px 30px;
  display: flex; flex-direction: column; align-items: center; gap: 18px; text-align: center;
}
.hero-card__tag {
  font-family: var(--font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .18em;
  text-transform: uppercase; color: var(--yellow);
}
.hero-card__mark { width: 56%; max-width: 168px; height: auto; filter: drop-shadow(0 14px 26px rgba(244, 124, 48, .22)); }
.hero-card__cap { font-size: .95rem; line-height: 1.5; color: var(--on-dark); max-width: 26ch; }
.hero-card__pin {
  position: absolute; bottom: -18px; left: -16px;
  background: var(--green); color: var(--ink); font-weight: 700; font-size: .85rem;
  padding: 10px 16px; border-radius: var(--r-pill);
  border: 1.5px solid var(--ink); box-shadow: var(--stamp-sm);
}
/* Hero video — YouTube trailer thay cho hero-card ở cột phải; khung 16:9 bo góc
   như thẻ dark, đổ bóng stamp cho đồng bộ, tự co trên mobile. */
.hero-video {
  width: 100%; max-width: 520px; aspect-ratio: 16 / 9;
  border-radius: var(--r-xl); overflow: hidden;
  border: 1.5px solid var(--ink); box-shadow: var(--stamp);
  background: var(--dark);
}
.hero-video iframe { width: 100%; height: 100%; border: 0; display: block; }
/* Hero media card — video đóng khung như hero-card (tag + caption + pin) để cột
   phải có chiều cao và sức nặng thị giác cân với cột text. */
.hero-media {
  position: relative; width: min(520px, 100%);
  background: var(--dark);
  background-image: radial-gradient(rgba(245, 239, 217, .06) 1.1px, transparent 1.2px);
  background-size: 22px 22px;
  border: 1.5px solid var(--ink); border-radius: var(--r-xl);
  box-shadow: var(--stamp); padding: 20px 20px 38px;
  display: flex; flex-direction: column; gap: 14px;
}
.hero-media__tag {
  font-family: var(--font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase; color: var(--yellow); text-align: center;
}
.hero-media .hero-video {
  max-width: none; border-radius: var(--r); box-shadow: none;
  border: 1px solid rgba(245, 239, 217, .16);
}
.hero-media__cap {
  font-family: var(--font-mono); font-size: .78rem; font-weight: 500; letter-spacing: .02em;
  color: var(--on-dark); text-align: center;
}
.hero__badges--row { margin-top: 38px; }
/* legacy hero art fallback (kept so older markup still renders) */
.flask-wrap {
  width: min(340px, 84%); aspect-ratio: 1; border-radius: var(--r-xl);
  background: var(--dark); border: 1.5px solid var(--ink); box-shadow: var(--stamp);
  display: grid; place-items: center; padding: 30px;
}
.flask-wrap img, .flask-wrap svg, .hero-mark { width: 62%; height: auto; }

/* ============================================================ Grids + section head */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.section-head { max-width: 800px; margin-bottom: clamp(32px, 5vw, 56px); }
.section-head.center { margin-inline: auto; }
.section-head h2, .section-head h3 { margin-top: 16px; }
.section-head .lead { margin-top: .5em; }

/* Consistent breathing room below every eyebrow → heading (works in section-head,
   hero, cta-strip, and cards alike, regardless of which heading level follows). */
.eyebrow + h1, .eyebrow + h2, .eyebrow + h3, .eyebrow + h4 { margin-top: 20px; }

/* ============================================================ Cards */
.card {
  background: var(--cream-card); border: 1.5px solid var(--line); border-radius: var(--r-lg);
  padding: 28px; box-shadow: var(--shadow);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.card h3 { margin-bottom: .35em; }
.card p { color: var(--ink-soft); margin-bottom: 0; }
.card p + p { margin-top: .9em; }
.grid .card:hover { transform: translateY(-4px); border-color: var(--ink); box-shadow: var(--stamp-sm); }
.card--stamp { border-color: var(--ink); box-shadow: var(--stamp-sm); background: #fff; }
.upsell .btn { margin-top: 18px; }
.upsell p { margin-bottom: 0; }
.card--num { position: relative; }
.card__num {
  font-family: var(--font-en); font-size: 2.5rem; font-weight: 800; line-height: 1;
  color: var(--orange); margin-bottom: 12px;
}
.card__tag {
  display: inline-block; font-family: var(--font-mono); font-size: .72rem; font-weight: 600;
  letter-spacing: .04em; color: var(--orange-600); text-transform: uppercase; margin-bottom: 10px;
}
.icon-dot {
  width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center;
  background: var(--green-100); color: var(--green-700); margin-bottom: 16px;
}
.icon-dot svg { width: 24px; height: 24px; }
.icon-dot--orange { background: var(--orange-100); color: var(--orange-600); }
.icon-dot--yellow { background: var(--yellow-100); color: var(--yellow-600); }

/* solution note line inside the "nút thắt" cards */
.card .fix {
  display: block; margin-top: 14px; padding: 12px 14px;
  background: var(--green-100); border-left: 3px solid var(--green-600); border-radius: 0 var(--r-xs) var(--r-xs) 0;
  color: var(--ink-700); font-size: .94rem;
}
.card .fix strong { color: var(--green-700); }

/* ============================================================ Checklist */
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 13px; }
.checklist li { position: relative; padding-left: 32px; color: var(--ink-soft); line-height: 1.55; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 3px; width: 21px; height: 21px;
  border-radius: 50%; background: var(--green-600);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='21' height='21' viewBox='0 0 24 24' fill='none' stroke='%23fbf8ee' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: center;
}
.crosslist li::before {
  background-color: #e7d3bf;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='21' height='21' viewBox='0 0 24 24' fill='none' stroke='%239a5a32' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 6 6 18M6 6l12 12'/%3E%3C/svg%3E");
}


/* Package availability markers: lower tiers show upgrade-only capabilities without changing the base card design. */
.capability-note {
  margin-top: 12px;
  color: var(--muted);
  max-width: 760px;
}
.card--locked {
  position: relative;
  overflow: visible;
}
.card__status {
  position: absolute;
  top: -14px;
  right: 18px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  margin: 0;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1.5px solid var(--ink);
  background: var(--orange);
  color: #fff;
  box-shadow: var(--stamp-sm);
  font-size: .72rem;
  line-height: 1;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ============================================================ Steps (stepper) */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 0; }
.step { position: relative; padding: 0 18px; text-align: center; }
.step__num {
  position: relative; z-index: 1; width: 56px; height: 56px; border-radius: 50%;
  display: grid; place-items: center; margin: 0 auto 18px;
  background: var(--orange); color: #fff; border: 1.5px solid var(--ink); box-shadow: var(--stamp-sm);
  font-family: var(--font-en); font-weight: 800; font-size: 1.4rem; line-height: 1;
}
.step:not(:last-child)::after {
  content: ""; position: absolute; z-index: 0; top: 28px; left: 50%;
  width: 100%; height: 2px; background: repeating-linear-gradient(90deg, rgba(31,41,55,.22) 0 7px, transparent 7px 14px);
}
.step h3 { margin-bottom: .4em; }
.step p { color: var(--ink-soft); margin-bottom: 0; }
.section--dark .step p { color: var(--on-dark); }
.section--dark .step:not(:last-child)::after { background: repeating-linear-gradient(90deg, rgba(245,239,217,.28) 0 7px, transparent 7px 14px); }

@media (max-width: 980px) {
  .steps { grid-auto-flow: row; grid-template-columns: 1fr; max-width: 560px; margin-inline: auto; }
  .step { display: grid; grid-template-columns: 56px 1fr; column-gap: 20px; text-align: left; padding: 0 0 36px 0; }
  .step:last-child { padding-bottom: 0; }
  .step__num { margin: 0; }
  .step__body { padding-top: 6px; }
  .step:not(:last-child)::after { top: 56px; left: 28px; transform: translateX(-50%); width: 2px; height: 100%; background: repeating-linear-gradient(180deg, rgba(31,41,55,.22) 0 7px, transparent 7px 14px); }
  .section--dark .step:not(:last-child)::after { background: repeating-linear-gradient(180deg, rgba(245,239,217,.28) 0 7px, transparent 7px 14px); }
}

/* ============================================================ Compare */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.compare__col { border-radius: var(--r-lg); padding: 30px; border: 1.5px solid var(--line); }
.compare__col h3 { font-size: 1.2rem; }
.compare__col ul { margin-top: 18px; }
.compare__col--bad { background: var(--cream-200); border-color: var(--cream-300); }
.compare__col--bad ul { list-style: none; padding: 0; display: grid; gap: 12px; }
.compare__col--bad li { position: relative; padding-left: 28px; color: var(--muted); line-height: 1.55; }
.compare__col--bad li::before { content: "–"; position: absolute; left: 6px; top: -1px; font-weight: 800; color: #b08968; font-size: 1.1rem; }
.compare__col--good { background: var(--dark); color: var(--cream); border-color: var(--ink); box-shadow: var(--stamp); }
.compare__col--good h3 { color: var(--on-dark-strong); }
.compare__col--good .checklist li { color: #fcfcfc; }

/* ============================================================ Chat demo (Telegram-style; classes wired in checkout.js) */
.chat {
  position: relative; max-width: 470px; padding: 14px; border-radius: var(--r-lg);
  border: 1.5px solid var(--ink); box-shadow: var(--stamp); overflow: hidden; color: var(--ink);
  background-color: #e9ddc7;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='46' height='46'%3E%3Cg fill='none' stroke='%23b59a6c' stroke-width='1.3' stroke-linecap='round' opacity='0.4'%3E%3Ccircle cx='11' cy='12' r='4'/%3E%3Cpath d='M32 6v9M27.5 10.5h9'/%3E%3Ccircle cx='35' cy='34' r='2.3'/%3E%3Cpath d='M6 33l3.5-3.5M9.5 33L6 29.5'/%3E%3C/g%3E%3C/svg%3E");
}
.chat__head {
  display: flex; align-items: center; gap: 11px;
  margin: -14px -14px 14px; padding: 12px 15px;
  background: #fff; border-bottom: 1px solid rgba(31, 41, 55, .08);
}
.chat__head img { width: 38px !important; height: 38px !important; border-radius: 50%; padding: 5px; background: var(--cream-50); box-shadow: inset 0 0 0 1px rgba(31, 41, 55, .1); }
.chat__head::after { content: "⋮"; margin-left: auto; color: #8a93a0; font-size: 1.3rem; line-height: 1; align-self: center; }
.chat__title { font-weight: 700; font-size: .95rem; color: var(--ink); line-height: 1.25; }
.chat__topics { font-size: .76rem; color: var(--green-700); font-weight: 600; margin-top: 1px; }
.bubble {
  position: relative; width: fit-content; max-width: 84%;
  padding: 8px 12px 9px; border-radius: 14px; font-size: .9rem; line-height: 1.48; margin-bottom: 8px;
  box-shadow: 0 1px 2px rgba(31, 41, 55, .12);
}
.bubble--me { margin-left: auto; background: #eaffd6; color: var(--ink); border-bottom-right-radius: 5px; padding-right: 32px; }
.bubble--me::after { content: "✓✓"; position: absolute; right: 9px; bottom: 6px; font-size: .62rem; letter-spacing: -1px; color: #3f8a45; }
.bubble--bot { background: #fff; color: var(--ink); border-bottom-left-radius: 5px; }
.bubble__who { display: block; font-size: .72rem; font-weight: 700; color: var(--orange-600); margin-bottom: 2px; }
.bubble--typing { background: #fff; color: var(--muted); font-style: italic; font-size: .82rem; }

.chat--tabbed .chat__head { border-bottom: none; margin-bottom: 0; }
.chat__tabs { display: flex; gap: 7px; flex-wrap: wrap; margin: 0 -14px 12px; padding: 9px 14px 11px; background: #fff; border-bottom: 1px solid rgba(31, 41, 55, .08); }
.chat__tab {
  font-family: var(--font-body); font-size: .78rem; font-weight: 600; color: var(--ink-soft);
  background: var(--cream-200); border: 0; border-radius: var(--r-pill); padding: 6px 13px; cursor: pointer;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.chat__tab:hover { background: var(--cream-300); }
.chat__tab.is-active { background: var(--orange); color: #fff; }
.chat__thread[hidden] { display: none; }
.chat__thread { animation: chatfade .28s var(--ease); }
@keyframes chatfade { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

/* ============================================================ Cycle (compounding) */
.cycle { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.cycle__item { text-align: center; padding: 24px 18px; border-radius: var(--r-lg); background: var(--cream-50); border: 1.5px solid var(--line); }
.cycle__n { width: 40px; height: 40px; border-radius: 50%; background: var(--orange); color: #fff; font-family: var(--font-en); font-weight: 800; display: grid; place-items: center; margin: 0 auto 12px; border: 1.5px solid var(--ink); }
.cycle__item h4 { margin: 0 0 6px; font-size: 1.02rem; }
.cycle__item p { font-size: .9rem; color: var(--muted); margin: 0; }

/* ============================================================ Audience cards */
.who { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.who__card { background: #fff; border: 1.5px solid var(--ink); border-radius: var(--r-lg); padding: 30px; box-shadow: var(--stamp-sm); }
.who__card .quote { font-style: italic; color: var(--ink-soft); border-left: 3px solid var(--orange); padding-left: 16px; margin: 16px 0; }
.who__pin { font-family: var(--font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--green-700); }

/* ============================================================ Pricing */
.price-card {
  background: #fff; border: 1.5px solid var(--ink); border-radius: var(--r-lg);
  padding: clamp(28px, 4vw, 44px); max-width: 640px; margin-inline: auto; box-shadow: var(--stamp);
}
.price-card__eyebrow { font-family: var(--font-mono); font-size: .78rem; font-weight: 600; color: var(--orange-600); letter-spacing: .04em; text-transform: uppercase; }
.price-card__name { font-family: var(--font-en); font-weight: 800; font-size: 1.15rem; letter-spacing: .02em; margin: 8px 0; color: var(--ink); }
.price-card__amount { font-family: var(--font-en); font-size: clamp(3rem, 8vw, 4.4rem); font-weight: 800; line-height: 1; margin: 10px 0; color: var(--ink); }

.price-card__badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 10px 0 6px;
  padding: 7px 13px;
  border-radius: var(--r-pill);
  border: 1.5px solid var(--ink);
  background: var(--orange);
  color: #fff;
  box-shadow: var(--stamp-sm);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.price-card__old {
  display: inline-block;
  margin-right: 10px;
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-thickness: 3px;
  text-decoration-color: var(--orange);
  opacity: .78;
}
.price-card__sale {
  color: var(--ink);
}
.price-card__amount small { display: inline-block; margin-left: 8px; font-family: var(--font-body); font-size: .92rem; font-weight: 600; color: var(--muted); letter-spacing: 0; }
.price-card .checklist { margin: 24px 0 26px; }
.price-note { font-size: .86rem; color: var(--muted); margin-top: 16px; }
.price-feats { margin: 20px 0 8px; }
.price-feats__group { font-size: 1rem; font-weight: 800; color: var(--ink); margin: 22px 0 13px; padding-top: 18px; border-top: 1px solid var(--line); }
.price-feats__group:first-child { margin-top: 4px; padding-top: 0; border-top: none; }
.price-feats .checklist { margin: 0; gap: 12px; }
.price-feats .checklist li { font-size: .95rem; }


/* High-attention commerce cards: upsell / alternative prompts below pricing tables. */
.card--orange {
  background: var(--orange);
  border-color: var(--ink);
  color: var(--ink);
  box-shadow: var(--stamp);
}
.card--orange .eyebrow {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 7px 12px;
  border-radius: var(--r-pill);
  border: 1.5px solid var(--ink);
  background: #fff;
  color: var(--orange-600);
  box-shadow: var(--stamp-sm);
}
.card--orange .eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  background: var(--green-600);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .45);
}
.card--orange h3 {
  color: var(--ink);
}
.card--orange p {
  color: var(--ink);
}
.card--orange a:not(.btn) {
  color: var(--ink);
  text-decoration-color: rgba(9, 9, 9, .72);
}
.card--orange .btn-ghost {
  background: #fff;
  color: var(--ink);
  border-color: var(--ink);
}
.card--orange .btn-ghost:hover {
  background: var(--cream-50);
}
.upsell__note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: var(--r);
  background: rgba(255, 255, 255, .5);
  border: 1.5px solid var(--ink);
  font-size: .92rem;
  line-height: 1.5;
}

/* Tiers grid (home) */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
.tier {
  background: var(--cream-card); border: 1.5px solid var(--line); border-radius: var(--r-lg);
  padding: 28px; display: flex; flex-direction: column; box-shadow: var(--shadow);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.tier:hover { transform: translateY(-5px); border-color: var(--ink); box-shadow: var(--stamp-sm); }
.tier__ribbon { font-family: var(--font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--orange-600); margin-bottom: 10px; min-height: 1em; }
.tier__name { font-weight: 800; font-size: 1.32rem; color: var(--ink); letter-spacing: -.01em; }
.tier__name.font-en { font-family: var(--font-en); }
.tier__price { font-family: var(--font-en); font-size: 1.85rem; font-weight: 800; margin: 8px 0 4px; color: var(--ink); }
.tier__price small { font-family: var(--font-body); font-size: .85rem; font-weight: 600; color: var(--muted); }
.tier p { font-size: .95rem; color: var(--ink-soft); flex: 1; }
.tier p a { color: var(--ink); font-weight: 800; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.tier .btn { margin-top: 18px; width: 100%; }
.tier--feature { border-color: var(--ink); background: var(--cream-card); color: var(--ink); box-shadow: var(--stamp); }
.tier--feature .tier__name, .tier--feature .tier__price { color: var(--ink); }
.tier--feature .tier__price small { color: var(--ink); }
.tier--feature .tier__ribbon { color: var(--orange-600); }
.tier--feature p { color: var(--ink); }
.tier--feature .btn-ghost { background: var(--cream-50); color: var(--ink); border-color: var(--ink); }
.tier--soon { opacity: .9; border-style: dashed; }
.tier--soon:hover { transform: none; border-color: var(--line); box-shadow: var(--shadow); }
.tag-soon { display: inline-block; font-family: var(--font-mono); font-size: .68rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--green-700); background: var(--green-100); padding: 4px 10px; border-radius: var(--r-pill); }

/* ============================================================ FAQ */
.faq { max-width: 820px; margin-inline: auto; display: grid; gap: 12px; }
.faq details { background: var(--cream-50); border: 1.5px solid var(--line); border-radius: var(--r); padding: 2px 22px; transition: border-color .18s var(--ease); }
.faq details[open] { border-color: var(--ink); }
.faq summary { font-weight: 700; cursor: pointer; padding: 18px 0; list-style: none; display: flex; justify-content: space-between; gap: 16px; align-items: center; color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.6rem; color: var(--orange-600); font-weight: 400; transition: transform .2s var(--ease); flex: none; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--ink-soft); padding-bottom: 20px; margin: 0; }

/* ============================================================ Checkout: buy layout + buyform (classes wired in checkout.js) */
.buy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 3vw, 36px); align-items: start; max-width: 1000px; margin-inline: auto; }
/* Desktop: form thanh toán bên TRÁI, deliverables (price-card) bên PHẢI.
   Mobile giữ nguyên source order: đọc "trong gói có gì" trước, form sau. */
@media (min-width: 881px) {
  .buy-grid .buy-panel { grid-column: 1; grid-row: 1; }
  .buy-grid .buy-left-stack { grid-column: 2; grid-row: 1; }
}
.buy-grid .price-card { max-width: none; margin: 0; }
.buy-left-stack { display: grid; gap: clamp(22px, 3vw, 30px); }
.starter-plus-inline { margin: 0; }
.starter-plus-inline h3 { margin: 0 0 10px; }
.starter-plus-inline p { margin: 0; color: var(--ink-soft); }

.buy-panel { background: var(--dark); color: var(--cream); border-radius: var(--r-lg); padding: clamp(24px, 3vw, 38px); box-shadow: var(--stamp); border: 1.5px solid var(--ink); }
.buyform__badge {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: .72rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase; color: var(--yellow);
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12);
  padding: 7px 14px; border-radius: var(--r-pill); margin-bottom: 18px;
}
.buyform__badge svg, .buyform__title svg { width: 15px; height: 15px; }
.buyform__title { font-size: clamp(1.3rem, 2.4vw, 1.7rem); color: var(--on-dark-strong); margin: 0 0 8px; }
.buyform__sub { font-size: .95rem; color: var(--on-dark); margin: 0 0 22px; line-height: 1.55; }
.buyform__sub strong { color: var(--on-dark-strong); }

.field { margin-bottom: 16px; }
.field > label { display: block; font-size: .9rem; font-weight: 600; color: rgba(245, 239, 217, .9); margin-bottom: 8px; }
.field .req { color: var(--orange); }
.field .opt { color: rgba(245, 239, 217, .5); font-weight: 500; }
.buyform input[type="text"], .buyform input[type="email"], .buyform input[type="tel"], .buyform input[type="url"], .buyform select, .buyform textarea {
  width: 100%; padding: 13px 15px; font-size: 1rem; font-family: var(--font-body);
  color: var(--cream); background: rgba(255, 255, 255, .05);
  border: 1.5px solid rgba(255, 255, 255, .14); border-radius: var(--r);
  transition: border-color .15s var(--ease), background .15s var(--ease);
}
.buyform textarea { min-height: 110px; resize: vertical; line-height: 1.55; }
.buyform input::placeholder, .buyform textarea::placeholder { color: rgba(245, 239, 217, .45); }
.buyform input:focus, .buyform select:focus, .buyform textarea:focus { outline: none; border-color: var(--orange); background: rgba(255, 255, 255, .08); }
/* select: custom chevron + dark options (native option list follows OS, but set colors for browsers that honor it) */
.buyform select { -webkit-appearance: none; appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23F5EFD9' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; padding-right: 40px; }
.buyform select:invalid { color: rgba(245, 239, 217, .45); }
.buyform select option { color: #1F2937; background: #F5EFD9; }
.buyform select option[disabled] { color: #9ca3af; }
.field__hint { font-size: .8rem; color: rgba(245, 239, 217, .55); margin: 8px 0 0; line-height: 1.5; }
/* Nhóm câu hỏi trong form dài (tư vấn B2B): divider nhỏ kiểu eyebrow. */
.buyform__group { font-family: var(--font-mono); font-size: .72rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: rgba(245, 239, 217, .55); margin: 26px 0 14px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .1); }
.buyform__group:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
/* Note soft-qualify (ngân sách dưới chuẩn → gợi ý Studio) — KHÔNG set display để attr hidden vẫn ăn. */
.field__hint--studio { padding: 12px 14px; background: rgba(244, 124, 48, .08); border: 1px solid rgba(244, 124, 48, .45); border-radius: var(--r); color: rgba(245, 239, 217, .8); font-size: .84rem; }
.field__hint--studio a { color: var(--yellow); font-weight: 700; }

.checkbox { display: flex; gap: 11px; align-items: flex-start; padding: 14px; margin: 4px 0 20px; background: rgba(255, 255, 255, .03); border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--r); cursor: pointer; }
.checkbox input { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--orange); flex: none; }
.checkbox span { font-size: .82rem; color: rgba(245, 239, 217, .62); line-height: 1.5; }
.checkbox strong { color: rgba(245, 239, 217, .92); font-weight: 600; }
.buyform__note { display: block; padding: 14px; margin: 4px 0 20px; background: rgba(255, 255, 255, .03); border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--r); font-size: .82rem; color: rgba(245, 239, 217, .62); line-height: 1.55; }
.buyform__note svg { width: 14px; height: 14px; vertical-align: -2px; }
.buyform__note strong { color: rgba(245, 239, 217, .92); font-weight: 600; }
.buyform__note a { color: var(--yellow); font-weight: 600; }

.buyform__submit { width: 100%; padding: 16px; background: var(--orange); color: #fff; border: 0; border-radius: var(--r-pill); font-family: var(--font-body); font-weight: 700; font-size: 1.05rem; cursor: pointer; transition: background .2s var(--ease), transform .15s var(--ease); box-shadow: 0 12px 26px -12px rgba(244, 124, 48, .8); }
.buyform__submit:hover { background: var(--orange-600); transform: translateY(-2px); }
.buyform__submit:disabled { opacity: .6; cursor: progress; transform: none; }
.buyform__error { color: #ffb4a2; font-size: .88rem; margin: 12px 0 0; }
.buyform__contact { font-size: .9rem; line-height: 1.55; color: rgba(245, 239, 217, .88); text-align: left; margin: 14px 0 0; padding: 12px 14px; border: 1px solid rgba(245, 239, 217, .18); border-radius: var(--r); background: rgba(255, 255, 255, .055); }
.buyform__contact a { color: var(--cream); font-weight: 800; }
.buyform__secure { font-size: .8rem; color: rgba(245, 239, 217, .5); text-align: center; margin: 10px 0 0; }

/* legacy buybox + sds-checkout reference UI */
.buybox { background: var(--cream-50); border: 1.5px solid var(--line); border-radius: var(--r-lg); padding: 24px; box-shadow: var(--shadow); }
.buybox__price { font-family: var(--font-en); font-size: 2rem; font-weight: 800; }
.buybox__price small { font-size: .95rem; font-weight: 600; color: var(--muted); }
.buybox__note { font-size: .82rem; color: var(--muted); margin-top: 14px; }
sds-checkout { display: block; margin-top: 16px; }
sds-checkout .sds-form { display: flex; flex-direction: column; gap: 10px; }
sds-checkout input { width: 100%; padding: 13px 15px; border: 1.5px solid var(--line); border-radius: var(--r); font-size: 1rem; font-family: var(--font-body); background: #fff; color: var(--ink); }
sds-checkout input:focus { outline: none; border-color: var(--orange); }
sds-checkout .sds-buy { width: 100%; padding: 14px; background: var(--orange); color: #fff; border: 0; border-radius: var(--r-pill); font-family: var(--font-body); font-weight: 700; font-size: 1.02rem; cursor: pointer; transition: background .2s var(--ease); }
sds-checkout .sds-buy:hover { background: var(--orange-600); }
sds-checkout .sds-qr { display: block; margin: 14px auto; border: 1px solid var(--line); border-radius: var(--r); background: #fff; }
sds-checkout .sds-status { font-weight: 700; color: var(--orange-600); margin-top: 12px; }

/* payment (QR) view after submit */
.buy-pay { text-align: center; }
.buy-pay__amount { font-size: 1.08rem; color: rgba(245, 239, 217, .85); margin: 0 0 14px; }
.buy-pay__amount strong { color: var(--cream); }
.buy-pay__qr { width: 240px; height: 240px; margin: 0 auto 16px; background: #fff; border-radius: var(--r); padding: 8px; }
.buy-pay__manual { text-align: left; font-size: .88rem; color: rgba(245, 239, 217, .75); background: rgba(255, 255, 255, .04); border: 1px dashed rgba(255, 255, 255, .18); border-radius: var(--r); padding: 14px; margin: 0 0 14px; }
.buy-pay__manual summary { cursor: pointer; font-weight: 600; color: var(--cream); }
.buy-pay__manual ul { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 7px; }
.buy-pay__manual strong { color: var(--cream); }
.buy-pay__status { font-weight: 700; color: var(--yellow); margin: 8px 0 0; }
.buy-pay__status--ok { color: var(--green); }
.buy-pay__status--bad { color: #ffb4a2; }
.buy-acct { background: rgba(244, 124, 48, .1); border: 1px solid rgba(244, 124, 48, .45); border-radius: var(--r); padding: 16px; margin-bottom: 18px; text-align: left; }
.buy-acct h3 { color: var(--cream); font-size: 1.02rem; margin: 0 0 8px; }
.buy-acct p { color: rgba(245, 239, 217, .72); font-size: .85rem; margin: 0 0 10px; line-height: 1.5; }
.buy-acct__link { display: block; word-break: break-all; color: var(--yellow); font-size: .82rem; margin-bottom: 10px; }
.buy-acct__msg { width: 100%; height: 104px; resize: vertical; background: rgba(0, 0, 0, .25); color: rgba(245, 239, 217, .88); border: 1px solid rgba(255, 255, 255, .14); border-radius: 10px; padding: 10px; font-size: .8rem; font-family: var(--font-body); margin-bottom: 10px; }
.buy-acct__copy { width: 100%; padding: 11px; background: #fff; color: var(--ink); border: 0; border-radius: var(--r-pill); font-weight: 700; cursor: pointer; font-family: var(--font-body); }
.buy-acct__copy:hover { background: var(--cream); }

@media (max-width: 880px) { .buy-grid { grid-template-columns: 1fr; max-width: 560px; } }

/* ============================================================ Resonance (dark) */
.resonance .section-head { max-width: 880px; }
.rflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; position: relative; margin-top: 10px; }
.rflow__step { background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--r-lg); padding: 24px 18px; position: relative; }
.rflow__icon { width: 48px; height: 48px; border-radius: 14px; background: var(--orange); display: grid; place-items: center; margin-bottom: 14px; border: 1.5px solid var(--ink); box-shadow: 0 8px 18px -10px rgba(244, 124, 48, .9); }
.rflow__icon svg { width: 24px; height: 24px; }
.rflow__step h4 { color: var(--on-dark-strong); margin: 0 0 7px; font-size: 1.06rem; }
.rflow__n { color: var(--yellow); font-family: var(--font-en); margin-right: 4px; }
.rflow__step p { color: var(--on-dark); font-size: .92rem; margin: 0; line-height: 1.5; }
.rflow__step:not(:last-child)::after { content: "→"; position: absolute; right: -13px; top: 50%; transform: translateY(-50%); color: rgba(245, 239, 217, .4); font-size: 1.3rem; z-index: 2; }
.rgrid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 24px; align-items: center; margin-top: 30px; }
.rchart { background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--r-lg); padding: 18px 20px; }
.rchart svg { width: 100%; height: auto; display: block; }
.rcompare { display: grid; gap: 16px; }
.rcompare__item { display: flex; gap: 14px; align-items: flex-start; background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .1); border-radius: var(--r-lg); padding: 20px; }
.rcompare__icon { width: 44px; height: 44px; border-radius: 13px; flex: none; display: grid; place-items: center; }
.rcompare__icon svg { width: 22px; height: 22px; }
.rcompare__icon--up { background: rgba(155, 201, 144, .22); }
.rcompare__icon--down { background: rgba(255, 255, 255, .07); }
.rcompare__item h4 { color: var(--on-dark-strong); margin: 0 0 5px; font-size: 1.06rem; }
.rcompare__item p { color: var(--on-dark); font-size: .9rem; margin: 0; line-height: 1.5; }
.rcta { margin-top: 36px; text-align: center; background: rgba(244, 124, 48, .1); border: 1.5px solid rgba(244, 124, 48, .5); border-radius: var(--r-lg); padding: 32px clamp(20px, 4vw, 44px); }
.rcta p { color: var(--on-dark-strong); font-size: 1.2rem; font-weight: 600; max-width: 60ch; margin: 0 auto 22px; line-height: 1.5; }

@media (max-width: 860px) { .rflow { grid-template-columns: repeat(2, 1fr); } .rflow__step:not(:last-child)::after { display: none; } .rgrid { grid-template-columns: 1fr; } }
@media (max-width: 460px) { .rflow { grid-template-columns: 1fr; } }

/* ============================================================ CTA strip */
.cta-strip { text-align: center; }
.cta-strip h2 { max-width: 30ch; margin-inline: auto; }
.cta-strip .lead { max-width: 60ch; margin: 0 auto 1.8em; }
.cta-strip .btn-row { justify-content: center; }

/* ============================================================ Footer */
.footer {
  color: var(--on-dark); padding-block: 60px 36px;
  background-color: var(--dark);
  background-image: radial-gradient(rgba(245, 239, 217, .04) 1.1px, transparent 1.2px);
  background-size: 26px 26px;
}
.footer__top { display: flex; flex-wrap: wrap; gap: 36px; justify-content: space-between; }
.footer .brand { color: var(--on-dark-strong); margin-bottom: 14px; }
.footer .brand img { width: 26px; }
.footer__links { display: flex; flex-wrap: wrap; gap: 40px; }
.footer__col h4 { font-family: var(--font-mono); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--yellow); margin-bottom: 14px; }
.footer__col a { display: block; font-size: .92rem; padding: 5px 0; color: var(--on-dark); transition: color .15s var(--ease); }
.footer__col a:hover { color: var(--on-dark-strong); }
.footer__bottom { border-top: 1px solid rgba(255, 255, 255, .1); margin-top: 36px; padding-top: 22px; font-family: var(--font-mono); font-size: .8rem; color: rgba(245, 239, 217, .5); display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }

/* ============================================================ Contrast hardening
   Light cards nested in a .section--dark must keep dark text (headings carry no
   explicit color and would otherwise inherit the section's cream). */
.card, .tier:not(.tier--feature), .cycle__item, .who__card, .price-card, .buybox,
.compare__col--bad, .faq details { color: var(--ink-700); }
.card h3, .card h4, .cycle__item h4, .who__card h3, .price-card__name,
.tier:not(.tier--feature) .tier__name, .tier:not(.tier--feature) .tier__price { color: var(--ink); }
.section--dark .tier:not(.tier--feature) .btn-ghost,
.section--dark .card .btn-ghost { color: var(--ink); border-color: var(--ink); }
.section--dark .tier:not(.tier--feature) .btn-ghost:hover,
.section--dark .card .btn-ghost:hover { background: var(--ink); color: var(--cream); }

/* ============================================================ Responsive */
@media (max-width: 920px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__art { order: -1; }
  .hero-card { width: min(320px, 80%); }
  .grid-3, .tiers, .cycle { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav__links { display: none; }
  .nav__links.open { display: flex; flex-direction: column; align-items: stretch; position: absolute; top: 70px; left: 0; right: 0; background: var(--cream); border-bottom: 1px solid var(--line); padding: 16px 20px; gap: 14px; box-shadow: var(--shadow); }
  .nav__links.open a { padding: 4px 0; }
  .nav__links.open .nav__cta { width: 100%; }
  .nav__burger { display: block; }
  .grid-2, .grid-3, .tiers, .compare, .who, .cycle { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto; animation: none !important; transition: none !important; } }

/* ---------- 21) Rebrand notice strip (transition period) ----------
   Removal: grep the REBRAND-NOTICE comment blocks in public/ and delete. */
.rebrand-strip { background: var(--green-100); color: var(--green-700); font-size: .88rem; line-height: 1.5; text-align: center; padding: 10px 16px; border-bottom: 1px solid var(--line); }
.rebrand-strip strong { color: inherit; }
.rebrand-strip a { color: inherit; font-weight: 700; text-decoration: underline; }

/* ---------- 22) Home: rename map + social links ---------- */
.rename-map { list-style: none; margin: 0; padding: 0; }
.rename-map li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; padding: 13px 2px; border-bottom: 1px dashed var(--line); font-size: .95rem; }
.rename-map li:last-child { border-bottom: none; padding-bottom: 2px; }
.rename-map .old { color: var(--muted); text-decoration: line-through; text-decoration-thickness: 1px; }
.rename-map .arrow { color: var(--orange-600); font-weight: 800; }
.rename-map .new { font-weight: 800; color: var(--ink); }
.rename-map .price { font-family: var(--font-mono); font-size: .82rem; color: var(--green-700); margin-left: auto; }
/* Home hero: một cột — text trên, video hàng riêng bên dưới, có max-width để không quá to */
.hero__stack h1 { max-width: 26ch; }
.hero__stack .lead { max-width: 58ch; }
.hero-video--row { margin: 48px auto 0; max-width: 680px; }
/* Social: lưới 2 cột, mỗi kênh một dòng bấm được */
.social-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.social-item {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px; border: 1.5px solid var(--line); border-radius: var(--r-lg);
  background: var(--cream-card); color: var(--ink); font-weight: 700;
  transition: transform .15s var(--ease), border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.social-item:hover { transform: translateY(-2px); border-color: var(--ink); box-shadow: var(--stamp-sm); }
.social-item__meta { margin-left: auto; font-family: var(--font-mono); font-size: .8rem; font-weight: 500; color: var(--muted); text-align: right; }
.social-item__arrow { color: var(--orange-600); font-weight: 800; flex: none; }
@media (max-width: 680px) { .social-grid { grid-template-columns: 1fr; } }