/* ============================================================
   SmartNail — Sales site (Surface 1) | src/site/css/site.css
   Brand: Blush & Rose Gold (docs/BRAND.md + css/brand.css tokens)
   Adapt teal/mint deliberately excluded (DESIGN v18).
   Static CSS — no build step. Literal hex mirrors brand tokens.
   ============================================================ */

:root {
  --color-primary: #c2456c;
  --color-primary-strong: #a83a5e;
  --color-accent: #b76e79;
  --color-accent-soft: #f3d9de;
  --color-neutral: #fff8f5;
  --color-neutral-alt: #fbeff2;
  --color-ink: #3d1220;
  --color-ink-muted: #7a4a5c;
  --color-success: #2f6b4f;
  --color-success-bg: #e4f1ea;
  --color-error: #8a2a3e;
  --color-error-bg: #fbe3e8;
  --color-border: #e8d3da;
  --color-dark-bg: #2a1019;
  --color-dark-surface: #3a1b26;
  --color-dark-text: #f9e3ea;
  --color-dark-muted: #c9a7b4;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --shadow-soft: 0 2px 12px rgba(61, 18, 32, 0.08);
  --shadow-raised: 0 8px 28px rgba(61, 18, 32, 0.14);

  --font-sans: "Be Vietnam Pro", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-neutral);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary-strong); }
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; border-radius: 4px; }

.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 300;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 12px; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--color-neutral);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  text-decoration: none;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 28%, #ecd3b2, #c9a37a 52%, #a98052);
  position: relative;
  flex: none;
  box-shadow: inset 0 0 0 3px rgba(255, 248, 245, 0.85), 0 1px 4px rgba(61, 18, 32, 0.25);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  border: 1.5px solid rgba(61, 18, 32, 0.35);
}
.main-nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
}
.main-nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 500;
  font-size: 0.95rem;
}
.main-nav a:hover { background: var(--color-neutral-alt); color: var(--color-primary-strong); }
.main-nav a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-primary-strong);
  font-weight: 600;
}

/* Language switch — VI default / EN (matches salon app pill toggle) */
.lang-switch {
  display: inline-flex;
  background: var(--color-neutral-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 3px;
  gap: 2px;
}
.lang-btn {
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-muted);
  cursor: pointer;
}
.lang-btn.is-active {
  background: var(--color-primary);
  color: #fff;
}
.lang-btn:not(.is-active):hover { color: var(--color-primary-strong); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-soft); }
.btn-primary:hover { background: var(--color-primary-strong); color: #fff; box-shadow: var(--shadow-raised); }
.btn-secondary { background: var(--color-neutral); color: var(--color-ink); border-color: var(--color-border); }
.btn-secondary:hover { background: var(--color-neutral-alt); color: var(--color-primary-strong); }
.btn-lg { padding: 15px 30px; font-size: 1.06rem; }
.btn-sm { padding: 8px 16px; font-size: 0.9rem; }

/* ---------- Sections ---------- */

.section { padding: var(--spacing-xxl, 64px) 0; }
.section-alt { background: var(--color-neutral-alt); }
.section-head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-strong);
}
.section-head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.section-head p { margin: 0; color: var(--color-ink-muted); font-size: 1.05rem; }

/* ---------- Hero ---------- */

.hero {
  background:
    radial-gradient(1100px 420px at 85% -10%, rgba(243, 217, 222, 0.9), transparent 60%),
    radial-gradient(700px 380px at -10% 110%, rgba(183, 110, 121, 0.14), transparent 55%),
    var(--color-neutral);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding-top: 56px;
  padding-bottom: 56px;
}
.hero-copy .eyebrow { margin-bottom: 14px; }
.hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
}
.hero-copy .hero-sub {
  margin: 0 0 14px;
  font-size: 1.12rem;
  color: var(--color-ink-muted);
  max-width: 34em;
}
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero figure {
  margin: 0;
  position: relative;
}
.hero figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-raised);
  aspect-ratio: 4 / 4.4;
  object-fit: cover;
}
.hero-chip-float {
  position: absolute;
  bottom: 18px;
  left: 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 248, 245, 0.94);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 8px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
}

/* ---------- Chip visual (CSS composition, no image needed) ---------- */

.chip-disc {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  flex: none;
  background: radial-gradient(circle at 34% 28%, #ecd3b2, #c9a37a 52%, #a98052);
  position: relative;
  box-shadow: inset 0 0 0 4px rgba(255, 248, 245, 0.7), inset -2px -2px 6px rgba(61, 18, 32, 0.22), 0 2px 6px rgba(61, 18, 32, 0.2);
}
.chip-disc::before {
  content: "";
  position: absolute;
  inset: 13%;
  border-radius: 50%;
  border: 2px dashed rgba(61, 18, 32, 0.4);
}
.chip-disc::after {
  content: "NFC";
  position: absolute;
  inset: 30% 0 auto;
  text-align: center;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(61, 18, 32, 0.72);
}
.chip-disc--sm { width: 44px; height: 44px; }
.chip-disc--sm::after { display: none; }

.app-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  background: var(--color-accent-soft);
  color: var(--color-primary-strong);
  border: 1px solid var(--color-border);
}

/* ---------- Cards & step grid ---------- */

.card {
  background: var(--color-neutral);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-soft);
}
.step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 1.12rem; }
.card p { margin: 0; color: var(--color-ink-muted); }

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.benefit-card { display: flex; gap: 14px; align-items: flex-start; }
.benefit-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  font-size: 1.15rem;
}

/* ---------- Pricing ---------- */

.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: stretch;
}
.price-card {
  display: flex;
  flex-direction: column;
  background: var(--color-neutral);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-soft);
}
.price-card--featured {
  border: 2px solid var(--color-primary);
  position: relative;
  box-shadow: var(--shadow-raised);
}
.price-card--featured::before {
  content: "Phổ biến · Popular";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 14px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.price-card h3 { margin: 0 0 4px; font-size: 1.2rem; }
.price-amount {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary-strong);
  margin: 0 0 4px;
}
.price-period { font-size: 0.85rem; color: var(--color-ink-muted); margin: 0 0 18px; }
.price-feats { list-style: none; margin: 0 0 24px; padding: 0; flex: 1; }
.price-feats li {
  padding: 7px 0 7px 26px;
  position: relative;
  color: var(--color-ink);
  font-size: 0.95rem;
}
.price-feats li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}
.chip-tier {
  background: var(--color-neutral-alt);
  border: 1px dashed var(--color-accent);
}
.chip-tier .price-amount { color: var(--color-accent); }
.price-note {
  margin: 24px auto 0;
  max-width: 720px;
  text-align: center;
  color: var(--color-ink-muted);
  font-size: 0.92rem;
}

/* ---------- CTA band ---------- */

.cta-band {
  background: linear-gradient(120deg, #a83a5e 0%, #c2456c 55%, #b76e79 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  text-align: center;
  padding: 56px 32px;
  box-shadow: var(--shadow-raised);
}
.cta-band h2 { margin: 0 0 10px; font-size: clamp(1.5rem, 3vw, 2rem); color: #fff; }
.cta-band p { margin: 0 auto 26px; max-width: 40em; color: #f9e3ea; }
.cta-band .btn-primary {
  background: #fff;
  color: var(--color-primary-strong);
  box-shadow: var(--shadow-raised);
}
.cta-band .btn-primary:hover { background: var(--color-neutral-alt); }
.cta-band .btn-secondary {
  background: rgba(255, 248, 245, 0.12);
  color: #fff;
  border-color: rgba(255, 248, 245, 0.5);
}
.cta-band .btn-secondary:hover { background: rgba(255, 248, 245, 0.22); color: #fff; }

/* ---------- Forms (sign-up) ---------- */

.form-card {
  max-width: 640px;
  margin: 0 auto;
  background: var(--color-neutral);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-soft);
}
.form-field { margin-bottom: 18px; }
.form-field label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.92rem;
}
.form-field .hint { font-size: 0.8rem; color: var(--color-ink-muted); margin-top: 4px; }
.form-field .hint.is-error { color: var(--color-error); font-weight: 500; }
.form-field input.is-invalid,
.form-field textarea.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(138, 42, 62, 0.12);
}
.form-field input,
.form-field textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-ink);
  background: #fff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(194, 69, 108, 0.18);
}
.form-field textarea { min-height: 96px; resize: vertical; }
.form-actions { margin-top: 24px; }
.form-privacy {
  margin: 14px 0 0;
  font-size: 0.8rem;
  color: var(--color-ink-muted);
}
.status-alert {
  display: none;
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
}
.status-alert.is-visible { display: block; }
.status-alert--success { background: var(--color-success-bg); color: var(--color-success); border: 1px solid rgba(47, 107, 79, 0.3); }
.status-alert--error { background: var(--color-error-bg); color: var(--color-error); border: 1px solid rgba(138, 42, 62, 0.3); }
.contact-fallback { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 10px; }
.contact-fallback[hidden] { display: none; }

/* ---------- How-it-works page extras ---------- */

.step-detail {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 24px;
  align-items: start;
  padding: 28px 0;
}
.step-detail + .step-detail { border-top: 1px solid var(--color-border); }
.step-detail .chip-disc { margin-top: 4px; }
.step-detail h3 { margin: 0 0 6px; font-size: 1.2rem; }
.step-detail p { margin: 0; color: var(--color-ink-muted); }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-dark-bg);
  color: var(--color-dark-muted);
  margin-top: 72px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 40px;
  padding-bottom: 40px;
}
.site-footer .brand { color: var(--color-dark-text); }
.footer-tagline { margin: 6px 0 0; font-size: 0.85rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 6px 20px; list-style: none; margin: 0; padding: 0; }
.footer-nav a { color: var(--color-dark-muted); text-decoration: none; font-size: 0.9rem; }
.footer-nav a:hover { color: var(--color-dark-text); }

.agency-branding-bar {
  text-align: center;
  padding: 12px 20px;
  font-size: 11px;
  color: #888;
  border-top: 1px solid #3a1b26;
  background: #fafafa;
}
.agency-branding-bar a { color: #c45c42; text-decoration: none; }
.agency-branding-bar p { margin: 0; }

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 28px; padding-top: 40px; }
  .step-grid { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
  .price-card--featured { order: -1; }
  .main-nav { order: 3; width: 100%; overflow-x: auto; }
  .main-nav ul { flex-wrap: wrap; }
  .header-inner { row-gap: 8px; }
}

@media (max-width: 640px) {
  .benefit-grid { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: 2rem; }
  .section { padding: 48px 0; }
  .form-card { padding: 24px; }
  .step-detail { grid-template-columns: 1fr; gap: 12px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}