/* Palette lấy từ logo: tím #6d3fe8 làm nhấn, thân thẻ Markdown #22242e làm nền tối. */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f7f8fc;
  --surface-2: #eef0f8;
  --border: #e3e6f0;
  --text: #1c1e27;
  --muted: #5d6478;
  --accent: #6d3fe8;
  --accent-2: #9b5cf6;
  --accent-soft: rgba(109, 63, 232, 0.09);
  --shadow: 0 24px 60px rgba(40, 32, 90, 0.13);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161d;
    --surface: #1b1e27;
    --surface-2: #222633;
    --border: #2f3442;
    --text: #eceef5;
    --muted: #a0a7bd;
    --accent: #8b6bf0;
    --accent-2: #b78af8;
    --accent-soft: rgba(139, 107, 240, 0.13);
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font:
    17px/1.65 -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    system-ui,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  background: var(--surface-2);
  border-radius: 5px;
  padding: 2px 6px;
}

.wrap {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 15px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--text);
}

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

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 11px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(40, 32, 90, 0.12);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #fff;
}

/* Nút cài có icon: đặt icon và chữ trên cùng một hàng, canh giữa theo trục dọc. */
.btn-store {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.btn-store img {
  border-radius: 4px;
}

.btn-sm {
  padding: 7px 15px;
  font-size: 14px;
  border-radius: 9px;
}

.nav-links .btn-sm {
  color: var(--text);
}

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

.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 76px 32px 72px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0 0 auto;
  height: 620px;
  background: radial-gradient(70% 55% at 50% 0%, var(--accent-soft), transparent 72%);
  pointer-events: none;
  z-index: -1;
}

.eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(38px, 4.6vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 800;
}

.grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  font-size: 19px;
  color: var(--muted);
  margin-top: 20px;
  max-width: 30em;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- cửa sổ demo gõ chữ ---------- */

.window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 15px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot.red {
  background: #f2685f;
}
.dot.amber {
  background: #f5bd4f;
}
.dot.green {
  background: #61c454;
}

.window-name {
  margin-left: 8px;
  font:
    12px ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  color: var(--muted);
}

.window-body {
  margin: 0;
  padding: 20px 22px;
  min-height: 320px;
  font:
    13.5px/1.72 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}

/* Quy tắc `code` toàn cục vẽ nền cho từng dòng trong khung demo — gỡ ở đây. */
.window-body code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

.window-body .fm {
  color: var(--muted);
}
.window-body .h1 {
  color: var(--accent);
  font-weight: 700;
}
.window-body .b {
  font-weight: 700;
}

.caret {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  margin-left: 1px;
  vertical-align: text-bottom;
  background: var(--accent);
  animation: blink 1.05s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* ---------- sections ---------- */

.band {
  padding: 84px 0;
}

.band.alt {
  background: var(--surface);
  border-block: 1px solid var(--border);
}

h2 {
  font-size: clamp(27px, 3vw, 35px);
  letter-spacing: -0.022em;
  line-height: 1.15;
}

.section-lede {
  color: var(--muted);
  margin-top: 14px;
  max-width: 46em;
  font-size: 17.5px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(272px, 1fr));
  gap: 20px;
  margin-top: 42px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: 0 14px 34px rgba(40, 32, 90, 0.1);
}

.icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 19px;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 18px;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--muted);
  font-size: 15.5px;
  margin-top: 7px;
}

/* ---------- steps ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 30px;
  margin-top: 42px;
}

.num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 14px;
}

.step h3 {
  font-size: 19px;
}

.step p {
  color: var(--muted);
  font-size: 15.5px;
  margin-top: 7px;
}

kbd {
  font:
    12.5px ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  background: var(--bg);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 1px 6px;
  margin-right: 2px;
  color: var(--text);
}

.shot {
  width: 100%;
  /* Thiếu height:auto thì grid item bị kéo giãn theo ô và ảnh méo tỉ lệ. */
  height: auto;
  display: block;
  margin-top: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- split ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 52px;
  align-items: center;
}

.split .shot {
  margin-top: 0;
  /* Ảnh trang cài đặt là ảnh dọc; để nguyên tỉ lệ thì cột phải cao gấp đôi cột
     chữ bên cạnh. Cắt bớt phần dưới, giữ phần đầu là phần đáng nhìn. */
  max-height: 520px;
  object-fit: cover;
  object-position: top;
}

.ticks {
  list-style: none;
  padding: 0;
  margin-top: 24px;
  color: var(--muted);
}

.ticks li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 11px;
  font-size: 16px;
}

.ticks li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ---------- closing ---------- */

.closing {
  background: linear-gradient(180deg, transparent, var(--accent-soft));
}

.center {
  text-align: center;
}

.center-text {
  margin-inline: auto;
}

.center-cta {
  justify-content: center;
  margin-top: 32px;
}

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

footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  font-size: 15px;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
}

footer a {
  color: var(--muted);
}

/* ---------- responsive ---------- */

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

  .hero {
    padding: 56px 24px 68px;
  }

  .nav-links a:not(.btn) {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .caret {
    animation: none;
  }

  .btn:hover,
  .card:hover {
    transform: none;
  }
}