/* ============================================================
   GUE (Guide Us) — Design System
   Palette sampled directly from Brand Identity/The Final Logo.png
   ============================================================ */

:root {
  --color-mint: #D6E8D4;
  --color-mint-deep: #B7D9B2;
  --color-mint-accent: #2F6B2A; /* darker green for links/hover — passes WCAG AA (6.2:1 on cream, 5.0:1 on mint) */
  --color-amber: #F5D9A8;
  --color-ink: #16180F;
  --color-white: #FFFFFF;
  --color-cream: #FBFAF6;
  --color-gray: #5B5F56;
  --color-cta-text-soft: rgba(255, 255, 255, 0.75);

  --radius-lg: 28px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --shadow-soft: 0 8px 30px rgba(22, 24, 15, 0.08);

  --font-display: 'Anton', 'Archivo Black', sans-serif;
  --font-body: 'Be Vietnam Pro', 'Segoe UI', sans-serif;

  --container-w: 1120px;
}

:root[data-theme="dark"] {
  --color-mint: #2A4830;
  --color-mint-deep: #203823;
  --color-mint-accent: #7FD671;
  --color-amber: #5C4526;
  --color-ink: #EDEEE6;
  --color-white: #2A2E24;
  --color-cream: #1E211A;
  --color-gray: #ABB0A2;
  --color-cta-text-soft: rgba(28, 31, 23, 0.7);
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-mint: #2A4830;
    --color-mint-deep: #203823;
    --color-mint-accent: #7FD671;
    --color-amber: #5C4526;
    --color-ink: #EDEEE6;
    --color-white: #2A2E24;
    --color-cream: #1E211A;
    --color-gray: #ABB0A2;
    --color-cta-text-soft: rgba(28, 31, 23, 0.7);
    --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-cream);
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

h1, h2, h3 {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  line-height: 1.5;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); }
h3 { font-size: 1.3rem; letter-spacing: 0.3px; }

p { margin: 0 0 0.9em; color: var(--color-gray); }

a { color: var(--color-mint-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: clamp(48px, 8vw, 96px) 0;
}

/* Standardized, tighter gap wherever two sections sit back-to-back
   (avoids the two sections' default padding stacking into a huge gap) */
.section:has(+ .section) {
  padding-bottom: 48px;
}

.section + .section {
  padding-top: 48px;
}

.section--mint {
  background: var(--color-mint);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-mint-accent);
  margin-bottom: 12px;
}

.text-center { text-align: center; }
.text-lead { font-size: 1.15rem; max-width: 760px; }
.mx-auto { margin-left: auto; margin-right: auto; }

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid var(--color-ink);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  text-decoration: none;
}

.btn:hover { transform: translateY(-2px); text-decoration: none; }

.btn--primary {
  background: var(--color-mint);
  color: var(--color-ink);
}

.btn--primary:hover { box-shadow: var(--shadow-soft); }

.btn--amber {
  background: var(--color-amber);
  color: var(--color-ink);
}

.btn--amber:hover { box-shadow: var(--shadow-soft); }

.btn--outline {
  background: transparent;
  color: var(--color-ink);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-cream);
  border-bottom: 2px solid var(--color-ink);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--container-w);
  margin: 0 auto;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  text-transform: uppercase;
  color: var(--color-ink);
}

.nav__brand img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--color-ink);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
}

.nav__links > li { flex-shrink: 0; }

.nav__links a {
  color: var(--color-ink);
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
}

.nav__links a:hover { color: var(--color-mint-accent); }

.nav__toggle {
  display: none;
  background: none;
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  margin: 4px 0;
}

@media (max-width: 820px) {
  .nav__toggle { display: block; }

  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-cream);
    border-bottom: 2px solid var(--color-ink);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    display: none;
  }

  .nav__links.is-open { display: flex; }

  .nav__links li { width: 100%; padding: 12px 0; border-bottom: 1px solid rgba(22,24,15,0.08); }
  .nav__links li:last-child { border-bottom: none; }
}

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

.hero {
  padding: clamp(56px, 10vw, 110px) 0 clamp(40px, 6vw, 70px);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero__tagline {
  display: inline-block;
  border-bottom: 3px solid var(--color-ink);
  padding-bottom: 4px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.hero__art {
  display: flex;
  justify-content: center;
}

.hero__art img {
  width: min(360px, 100%);
  border-radius: 50%;
  border: 4px solid var(--color-ink);
  box-shadow: var(--shadow-soft);
}

@media (max-width: 820px) {
  .hero__grid { grid-template-columns: 1fr; text-align: center; }
  .hero__actions { justify-content: center; }
  .hero__tagline { border-bottom: none; }
}

/* ---------- Feature / 3-up cards ---------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
}

.card {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.card__head h3 { margin: 0; }

.card__icon {
  width: 54px;
  height: 54px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-mint);
  border: 2px solid var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

/* ---------- Page hero (inner pages) ---------- */

.page-hero {
  padding: 56px 0 24px;
  text-align: center;
}

.page-hero + .section {
  padding-top: clamp(16px, 3vw, 32px);
}

.page-hero .eyebrow { margin-bottom: 8px; }

/* ---------- Content blocks ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 820px) {
  .split { grid-template-columns: 1fr; }
}

.pill-list { list-style: none; margin: 0; padding: 0; }

.pill-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 10px 0;
  border-bottom: 1px solid rgba(22,24,15,0.1);
}

.pill-list--center {
  margin-left: auto;
  margin-right: auto;
}

.pill-list li:last-child { border-bottom: none; }

.pill-list .dot {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-mint-accent);
  margin-top: 8px;
}

.note-box {
  background: var(--color-white);
  border: 2px dashed var(--color-mint-accent);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  font-size: 0.95rem;
}

.note-box strong { color: var(--color-ink); }

/* ---------- Bio cards (About page) ---------- */

.bio-card {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.bio-card__avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-mint);
  border: 2px solid var(--color-ink);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.5rem;
  overflow: hidden;
}

.bio-card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 560px) {
  .bio-card { flex-direction: column; text-align: center; align-items: center; }
}

/* ---------- CTA banner ---------- */

.cta-banner {
  background: var(--color-white);
  color: var(--color-ink);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: clamp(32px, 6vw, 56px);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 14px;
}

.cta-banner > * { margin: 0; }

/* Workshop registration page: this banner sits beside a taller form (equal-height
   pair), so its own content should center vertically rather than hug the top. */
#dang-ky .cta-banner { justify-content: center; }

.cta-banner h2 { color: var(--color-ink); }
.cta-banner p { color: var(--color-gray); }

.cta-banner__icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-mint);
  border: 2px solid var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.cta-banner .cta-topic {
  display: inline-block;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  font-size: clamp(1rem, 1.8vw, 1.3rem);
  color: var(--color-ink);
  background: var(--color-mint);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  padding: 8px 18px;
}

.btn--cta-outline {
  border-color: var(--color-ink);
  color: var(--color-ink);
  background: transparent;
}

/* ---------- Form ---------- */

.form {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 5vw, 44px);
  max-width: 620px;
  margin: 0 auto;
}

.form-row { margin-bottom: 20px; }

.form-row label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--color-cream);
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: 3px solid var(--color-mint-deep);
  outline-offset: 1px;
}

.form-note {
  font-size: 0.85rem;
  color: var(--color-gray);
  margin-top: 16px;
}

.form-success {
  display: none;
  text-align: center;
  padding: 40px 20px;
}

.form-success.is-visible { display: block; }
.form.is-hidden { display: none; }

/* ---------- QR / upcoming-cohort block ---------- */

.qr-block {
  display: none;
  background: var(--color-mint);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 20px;
  text-align: center;
}

.qr-block.is-visible { display: block; }

.qr-block img {
  margin: 12px auto;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-ink);
  background: #fff;
}

/* ---------- Schedule box ---------- */

.schedule-box {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.schedule-box dl {
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 16px;
  font-size: 0.92rem;
}

.schedule-box dt { font-weight: 700; color: var(--color-ink); }
.schedule-box dd { margin: 0; color: var(--color-gray); }

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

.site-footer {
  border-top: 2px solid var(--color-ink);
  padding: 40px 0;
  margin-top: 40px;
}

.footer__grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  text-transform: uppercase;
}

.footer__brand img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-ink);
}

.footer__meta {
  font-size: 0.85rem;
  color: var(--color-gray);
}

/* ---------- Language switcher ---------- */

.lang-switch {
  display: flex;
  align-items: center;
  border: 2px solid var(--color-ink);
  border-radius: 999px;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 700;
}

.lang-switch a {
  padding: 6px 12px;
  color: var(--color-ink);
  text-decoration: none;
}

.lang-switch a.is-active {
  background: var(--color-ink);
  color: var(--color-white);
}

.lang-switch a:hover { text-decoration: none; }

/* ---------- Theme toggle ---------- */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid var(--color-ink);
  background: var(--color-white);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 0;
}

.theme-toggle:hover { box-shadow: var(--shadow-soft); }

.theme-toggle .icon-dark { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-light { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-dark { display: inline; }

/* ---------- Social footer ---------- */

.footer__social {
  display: flex;
  gap: 12px;
  align-items: center;
}

.footer__social a,
.footer__social button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--color-ink);
  color: var(--color-ink);
  background: transparent;
  cursor: pointer;
  padding: 0;
  font-family: inherit;
}

.footer__social a:hover,
.footer__social button:hover {
  background: var(--color-mint);
  text-decoration: none;
}

.footer__social svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- Zalo QR modal ---------- */

.zalo-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
}

.zalo-modal.is-open { display: flex; }

.zalo-modal__card {
  position: relative;
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 320px;
  width: 100%;
  text-align: center;
}

.zalo-modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--color-ink);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
}

.zalo-modal__avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 12px;
  border: 2px solid var(--color-ink);
}

.zalo-modal__avatar img { width: 100%; height: 100%; object-fit: cover; }

.zalo-modal__qr {
  width: 100%;
  max-width: 220px;
  height: auto;
  border-radius: var(--radius-sm);
  margin: 0 auto;
  display: block;
}

/* ---------- Track badge ---------- */

.track-badge {
  display: inline-block;
  align-self: flex-start;
  width: fit-content;
  white-space: nowrap;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 999px;
  border: 2px solid var(--color-ink);
  background: var(--color-white);
  margin-bottom: 14px;
}

.track-badge--comm { background: var(--color-mint); }
.track-badge--ielts { background: var(--color-mint); }

/* ---------- Course cards (hub page) ---------- */

.course-card {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.course-card h3 { margin-bottom: 8px; }

.course-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 16px;
}

.course-card__meta span {
  background: var(--color-white);
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-ink);
}

.course-card__price {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 6px 0 16px;
}

.course-card .btn { margin-top: auto; align-self: flex-start; justify-self: start; }

/* Align each row (heading, description, meta, price, button) across sibling
   course cards, regardless of description line count — via CSS Grid subgrid,
   scoped to only the "full" course-card grids (the ones with a price). */
.grid-2:has(.course-card__price) { grid-template-rows: repeat(6, auto); row-gap: 0; }
.grid-2:has(.course-card__price) > .course-card {
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 6;
  margin-bottom: 24px;
}

.grid-3:has(.course-card__price) { grid-template-rows: repeat(5, auto); row-gap: 0; }
.grid-3:has(.course-card__price) > .course-card {
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 5;
  margin-bottom: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 32px;
}

@media (max-width: 820px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* ---------- Course detail page ---------- */

.price-box {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.price-box__tag {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin-bottom: 4px;
}

.price-box dl {
  margin: 18px 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 16px;
  font-size: 0.92rem;
}

.price-box dt { font-weight: 700; color: var(--color-ink); }
.price-box dd { margin: 0; color: var(--color-gray); }

.curriculum-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: module;
}

.curriculum-list li {
  counter-increment: module;
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(22,24,15,0.1);
}

.curriculum-list li:last-child { border-bottom: none; }

.curriculum-list li::before {
  content: counter(module, decimal-leading-zero);
  flex-shrink: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-mint-accent);
}

/* ---------- Testimonials ---------- */

.quote-card {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 24px;
  height: 100%;
}

.quote-card__text {
  font-size: 0.95rem;
  color: var(--color-ink);
  font-style: italic;
}

.quote-card__author {
  margin-top: 14px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-mint-accent);
}

/* ---------- Life Areas grid (Workshops) ---------- */

.life-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.life-card {
  background: var(--color-white);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
}

.life-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  border: 2px solid var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.life-card__icon { background: var(--color-mint); }

.life-card h3 { margin-bottom: 10px; font-size: 1.05rem; letter-spacing: 1px; }
.life-card p { font-size: 0.9rem; margin-bottom: 0; }

/* ---------- FAQ accordion ---------- */

.faq-item {
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  padding: 4px 24px;
  margin-bottom: 16px;
  background: var(--color-white);
}

.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  padding: 18px 36px 18px 0;
  list-style: none;
  position: relative;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 18px;
  font-family: var(--font-display);
  font-size: 1.3rem;
}

.faq-item[open] summary::after { content: '\2212'; }

.faq-item p, .faq-item ul { font-size: 0.95rem; }
.faq-item div { padding-bottom: 20px; }