/* Palette matches idiomvn.com. Theme: follows the system unless
   <html data-theme="light|dark"> is set by the toggle. */
:root {
  color-scheme: light;
  --bg: #fdfcfa;
  --surface: #ffffff;
  --text: #16130f;
  --muted: #6b655d;
  --line: #e6e2da;
  --accent: #2d5a4a;
  --accent-soft: #e5eeea;
  --shadow: 0 1px 2px rgba(22, 19, 15, .04), 0 8px 24px rgba(22, 19, 15, .06);
  --radius: 18px;
  --sans: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Newsreader", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #0f1211;
    --surface: #161a18;
    --text: #efede7;
    --muted: #98928a;
    --line: #262c28;
    --accent: #79b49b;
    --accent-soft: #1b2621;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1211;
  --surface: #161a18;
  --text: #efede7;
  --muted: #98928a;
  --line: #262c28;
  --accent: #79b49b;
  --accent-soft: #1b2621;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
em { font-family: var(--serif); font-style: italic; font-size: 1.08em; color: var(--accent); }

.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }

/* Nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 24px 0;
}
.mark {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 11px;
  background: var(--accent); color: var(--bg);
  font: 700 18px/1 var(--serif); text-decoration: none;
}
.nav nav { display: flex; gap: 24px; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; transition: color .2s; }
.nav nav a:hover { color: var(--text); }
.nav-right { display: flex; align-items: center; gap: 24px; }

/* Theme toggle (same pattern as idiomvn.com) */
.theme-toggle {
  display: inline-flex; gap: 2px; padding: 2px;
  border: 1px solid var(--line); border-radius: 999px;
}
.theme-toggle button {
  display: grid; place-items: center;
  width: 32px; height: 32px; padding: 0;
  border: 0; border-radius: 999px; background: transparent;
  color: var(--muted); cursor: pointer; transition: color .2s, background .2s;
}
.theme-toggle button:hover { color: var(--text); }
.theme-toggle button[aria-pressed="true"] { background: var(--line); color: var(--text); }
.theme-toggle button:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.theme-toggle svg { width: 18px; height: 18px; }

/* Language switcher (links to the other language's page) */
.lang-switch {
  display: inline-flex; align-items: center; gap: 6px; min-height: 36px;
  color: var(--muted); text-decoration: none;
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
  transition: color .2s;
}
.lang-switch:hover { color: var(--text); }
.lang-switch:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.lang-switch svg { flex-shrink: 0; border-radius: 2px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* Hero */
.hero { padding: 96px 0 72px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  margin: 0 0 20px; color: var(--muted); font-size: 14px; font-weight: 500;
  letter-spacing: .02em;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
h1 {
  margin: 0; font-weight: 700; letter-spacing: -.035em;
  font-size: clamp(44px, 8vw, 88px); line-height: 1.02;
}
.lede { max-width: 620px; margin: 24px 0 36px; color: var(--muted); font-size: clamp(18px, 2.2vw, 21px); }
.hero-links, .contact-links { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 22px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface);
  font-weight: 600; font-size: 15px; text-decoration: none;
  transition: transform .2s, border-color .2s, background .2s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }

/* Sections */
.section { padding: 64px 0; border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 8px 24px; margin-bottom: 32px; }
h2 { margin: 0; font-size: clamp(28px, 4vw, 36px); letter-spacing: -.025em; }
.section-head p { margin: 0; color: var(--muted); }

/* Project cards */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .3s, box-shadow .3s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 2px 4px rgba(26,24,20,.05), 0 18px 40px rgba(26,24,20,.10); }
.shot { display: block; overflow: hidden; border-bottom: 1px solid var(--line); background: #fbfaf6; }
:root[data-theme="dark"] .shot img { filter: brightness(.85); }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) .shot img { filter: brightness(.85); } }
.shot img { aspect-ratio: 1200 / 630; object-fit: cover; transition: transform .5s ease; }
.card:hover .shot img { transform: scale(1.03); }
.card-body { display: flex; flex-direction: column; gap: 14px; padding: 24px 26px 26px; flex: 1; }
.card-title { display: flex; align-items: center; justify-content: space-between; }
h3 { margin: 0; font-size: 22px; letter-spacing: -.02em; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.status {
  font-size: 12px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); padding: 4px 10px; border-radius: 999px;
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tags li { font-size: 13px; padding: 4px 11px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.tags.big li { font-size: 14px; padding: 6px 14px; background: var(--surface); }
.visit { margin-top: auto; color: var(--accent); font-weight: 600; text-decoration: none; }
.visit:hover { text-decoration: underline; text-underline-offset: 4px; }

.card.placeholder {
  grid-column: 1 / -1; box-shadow: none; background: transparent;
  border-style: dashed; text-align: center;
}
.card.placeholder:hover { transform: none; box-shadow: none; }
.card.placeholder .card-body { align-items: center; padding: 36px; }

/* About */
.about-body { max-width: 720px; display: grid; gap: 24px; }
.about-body p { margin: 0; font-size: 19px; }

/* Contact */
.contact { text-align: center; padding: 96px 0; }
.contact h2 { font-size: clamp(36px, 6vw, 56px); }
.contact p { color: var(--muted); margin: 12px 0 32px; }
.contact-links { justify-content: center; }

/* Footer */
.footer {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  padding: 28px 0 40px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 14px;
}
.footer a { text-decoration: none; }
.footer a:hover { color: var(--text); }

@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 48px; }
  .nav nav { gap: 16px; }
  .nav { gap: 16px; }
  .nav-right { gap: 14px; }
  .nav nav a { font-size: 14px; }
}

/* Single page: on small phones the section links go, the controls stay */
@media (max-width: 480px) {
  .nav nav { display: none; }
}

@media (max-width: 400px) {
  .nav-right { gap: 10px; }
  .theme-toggle button { width: 28px; height: 28px; }
  .section { padding: 48px 0; }
}

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