/* MEMBER - landing page stylesheet (GET /).
 *
 * Loaded after app.css, so it may refine shared selectors - but only under the
 * `body.landing` scope, which the landing template sets via {% block body_class %}.
 *
 * Mobile first. No CDN, no @import, no web font: a system serif stack for headings and
 * the system sans stack (app.css) for body copy.
 *
 * Colour system: the primary colour is NEVER written here - `--brand` is injected by
 * base.html from BRAND_PRIMARY_COLOR (the brand's Pine Teal in production, #2563eb when
 * unconfigured). The cream canvas, ink, muted and rule tokens below are the brand's
 * supporting palette; every accent is derived from `--brand` with color-mix() inside
 * @supports, so a browser without color-mix keeps the neutral fallback instead of
 * losing the rule.
 *
 * Layout switches only through classes (never a style attribute, which the nonce based
 * CSP would block).
 */

/* ============================================================== colour system */

body.landing {
  /* supporting palette (light theme = default) */
  --cream: #fef7ef;        /* page canvas */
  --cream-card: #fff8f0;   /* cards, header, footer */
  --wash: #f7efe4;         /* soft section band */
  --ink: #13322c;          /* headings */
  --ink-body: #141414;     /* body copy */
  --muted: #4b5f58;        /* secondary copy (6.4:1 on the cream canvas) */
  --on-brand: #fef7ef;     /* text on a primary surface (>= 9:1 on the brand colour) */
  --accent: var(--brand);  /* links, eyebrow, ticks */
  --border: #e7dfd3;
  --rule: #ddd1c1;
  --shadow: 0 1px 2px rgba(19, 50, 44, .04), 0 16px 34px rgba(19, 50, 44, .06);

  /* app.css tokens, re-pointed at the brand canvas */
  --bg: var(--cream);
  --surface: var(--cream-card);
  --text: var(--ink-body);
  --radius: 10px;
  --radius-sm: 6px;

  color: var(--text);
}

body.landing a:not(.btn) { color: var(--accent); }

body.landing .btn-primary { color: var(--on-brand); }
body.landing .btn-primary:hover { filter: brightness(1.08); }

body.landing .btn-ghost {
  background: transparent;
  border-color: var(--rule);
  color: var(--ink);
}

/* Headings: light serif, ink teal-brown. */
body.landing .hero-title,
body.landing .section-heading,
body.landing .benefit-title,
body.landing .step-title,
body.landing .register-title,
body.landing .faq-question,
body.landing .brand-name {
  font-family: Georgia, "Times New Roman", "Noto Serif", "Songti SC", serif;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: .004em;
}

/* ------------------------------------------------------------------ shell */

body.landing .site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom-color: var(--rule);
  box-shadow: 0 1px 0 var(--rule);
}

body.landing .header-inner { flex-wrap: wrap; gap: .5rem 1rem; }
body.landing .brand { gap: .75rem; }
body.landing .brand-name { font-size: 1.12rem; }

/* The hero carries the tagline, so the header keeps only the brand name. */
body.landing .brand-tagline { display: none; }

body.landing .main {
  max-width: 1120px;
  padding-top: 1.5rem;
  padding-bottom: 3rem;
}

/* A long LANDING_CTA_TEXT may wrap inside the button on a narrow screen. */
.landing-nav-cta { white-space: normal; text-align: center; }

/* Anchors must clear the sticky header when a CTA scrolls to them. */
#loi-ich, #dang-ky, #quy-trinh, #cau-hoi, #lien-he { scroll-margin-top: 96px; }

.section { margin: 0 0 2.5rem; }

.section-heading {
  font-size: 1.32rem;
  margin: 0 0 1.25rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--rule);
}

/* ------------------------------------------------------------------- hero */

.hero {
  margin-bottom: 2.75rem;
  padding: 1.5rem 1.15rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--wash) 0%, var(--surface) 72%);
  box-shadow: var(--shadow);
}

.hero-eyebrow {
  margin: 0 0 .6rem;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-title {
  font-size: clamp(1.45rem, 6.2vw, 1.9rem);
  line-height: 1.16;
  margin: 0 0 .75rem;
  max-width: 24ch;
}

.hero-subtitle {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: clamp(.98rem, 2.6vw, 1.04rem);
  line-height: 1.65;
  max-width: 58ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin: 0 0 1.5rem;
}

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.25rem;
  margin: 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--rule);
  list-style: none;
  color: var(--muted);
  font-size: .875rem;
}

.hero-trust li { display: flex; align-items: center; gap: .4rem; }

.hero-trust li::before {
  content: "\2713"; /* ✓ */
  color: var(--accent);
  font-weight: 700;
}

.hero-media { margin-top: 1.75rem; }

.hero-image {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

/* --------------------------------------------------------------- buttons */

.btn-lg {
  padding: .8rem 1.4rem;
  font-size: 1.01rem;
  letter-spacing: .01em;
}

/* -------------------------------------------------------------- benefits */

.benefit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.benefit-card {
  padding: 1.5rem 1.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.benefit-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.6rem;
  min-height: 2.6rem;
  padding: 0 .45rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--wash);
  font-size: 1.3rem;
  line-height: 1;
}

.benefit-title { font-size: 1.1rem; margin: .9rem 0 .4rem; }
.benefit-text { margin: 0; color: var(--muted); line-height: 1.6; }

/* ----------------------------------------------------------------- form */

.register-card {
  max-width: 620px;
  margin: 0 auto;
  border-color: var(--border);
  border-radius: var(--radius);
}

.register-title { font-size: 1.4rem; margin: 0 0 .3rem; }
.register-subtitle { color: var(--muted); margin: 0 0 1.25rem; }

/* --------------------------------------------------------- how it works */

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.step-card {
  padding: 1.35rem 1.35rem 1.5rem;
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--wash);
  color: var(--accent);
  font-weight: 700;
  font-size: .95rem;
}

.step-title { font-size: 1.08rem; margin: .85rem 0 .35rem; }
.step-text { margin: 0; color: var(--muted); line-height: 1.6; }

/* ------------------------------------------------------------------ faq */

.faq-list { display: grid; gap: .7rem; }

.faq-item {
  padding: .4rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.faq-question {
  padding: .6rem 0;
  font-size: 1.02rem;
  cursor: pointer;
}

.faq-answer { margin: 0 0 .85rem; color: var(--muted); line-height: 1.65; }

/* -------------------------------------------------------------- contact */

.landing-contact {
  padding: 1.75rem 1.35rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--wash);
}

.landing-contact .section-heading { border-bottom: 0; padding-bottom: 0; }

.contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem 1.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-item { min-width: 0; overflow-wrap: anywhere; }

.contact-label {
  display: block;
  margin-bottom: .15rem;
  color: var(--muted);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* ------------------------------------------------------------- a11y/misc */

body.landing summary:focus-visible,
body.landing a:focus-visible,
body.landing button:focus-visible,
body.landing input:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

body.landing input:focus,
body.landing select:focus { border-color: var(--brand); }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  body.landing .btn { transition: filter .18s ease, background-color .18s ease, border-color .18s ease; }
}

@media (hover: hover) and (prefers-reduced-motion: no-preference) {
  .benefit-card { transition: transform .18s ease, box-shadow .18s ease; }
  .benefit-card:hover { transform: translateY(-2px); }
  .faq-item { transition: border-color .18s ease; }
  .faq-item:hover { border-color: var(--rule); }
}

@media (prefers-reduced-motion: reduce) {
  body.landing *,
  body.landing *::before,
  body.landing *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------- >= 640px */

/* ---------- phones ---------- */
@media (max-width: 640px) {
  .hero { padding: 1.35rem 1.05rem; margin-bottom: 1.9rem; }
  .hero-title { max-width: none; }
  /* stacked, full-width buttons are far easier to tap than two side-by-side pills */
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; text-align: center; }
  .hero-trust { gap: .35rem .9rem; font-size: .82rem; }
  .hero-media { margin-top: 1.25rem; }
  .hero-image { max-height: 46vh; object-fit: cover; }
}

@media (min-width: 640px) {
  body.landing .main { padding-top: 2.25rem; }
  body.landing .header-inner { flex-wrap: nowrap; }
  .landing-nav-cta { white-space: nowrap; }
  .hero { padding: 2.75rem 2.25rem; }
  .hero-title { font-size: 2.35rem; }
  .section { margin-bottom: 3.25rem; }
  .section-heading { font-size: 1.55rem; }
  .benefit-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .contact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .landing-contact { padding: 2.25rem 2rem; }
}

/* --------------------------------------------------------- >= 900px */

@media (min-width: 900px) {
  .hero { padding: 3.5rem 3rem; }
  .hero-title { font-size: 2.85rem; }
  .hero.hero-with-media {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: 3rem;
  }
  .hero.hero-with-media .hero-media { margin-top: 0; }
  .hero.hero-with-media .hero-image { max-height: 440px; }
  .benefit-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .contact-list { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
}

/* -------------------------------------------------------------- dark mode */

@media (prefers-color-scheme: dark) {
  body.landing {
    --cream: #0e1a17;
    --cream-card: #132320;
    --wash: #12211d;
    --ink: #eaf3ef;
    --ink-body: #e6ebe8;
    --muted: #a8bdb6;
    --on-brand: #f4faf7;
    --accent: #9ecbbd; /* Pine Teal lightened for AA on the dark canvas */
    --border: #26372f;
    --rule: #2f463c;
    --shadow: none;
  }
  body.landing .site-header { box-shadow: 0 1px 0 var(--rule); }
}

/* Derived accents from the configured brand colour (kept last so the mix follows the
   active light/dark tokens above). */
@supports (background: color-mix(in srgb, red 10%, white)) {
  body.landing {
    --border: color-mix(in srgb, var(--brand) 14%, var(--cream-card));
    --rule: color-mix(in srgb, var(--brand) 26%, transparent);
    --wash: color-mix(in srgb, var(--brand) 6%, var(--cream));
  }
}

/* ---------------------------------------------------------------- print */

@media print {
  .hero-actions,
  .register,
  .faq,
  .landing-nav { display: none; }
  .hero,
  .benefit-card,
  .step-card,
  .landing-contact { border-color: #ccc; box-shadow: none; background: none; }
}