/* =====================================================================
   PinaKey — landing page · phong cách "Mực & Son"
   Giấy dó · mực nho · son mài đỏ · nhũ vàng · lục terminal
   ===================================================================== */

:root {
  /* màu — giao diện sáng (giấy dó) */
  --paper: #f2ebdd;
  --paper-2: #e9dfc9;
  --paper-3: #e1d4b8;
  --ink: #211c2b;
  --ink-soft: #4c4456;
  --ink-faint: #6f6678;
  --son: #c53a24; /* son mài đỏ */
  --son-deep: #a32d1a;
  --gold: #ab7d24; /* nhũ vàng */
  --term: #2e7d5b; /* lục terminal */
  --line: rgba(33, 28, 43, 0.14);
  --card: #f7f1e6;
  --card-edge: rgba(33, 28, 43, 0.1);
  --shadow: 28px 28px 60px rgba(33, 28, 43, 0.12);

  --serif: "Playfair Display", Georgia, serif;
  --sans: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --wrap: 1160px;
  --r: 18px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

[data-theme="dark"] {
  --paper: #14121c;
  --paper-2: #1c1927;
  --paper-3: #242031;
  --ink: #ece3d2;
  --ink-soft: #c2b8a8;
  --ink-faint: #8d8496;
  --son: #e5613f;
  --son-deep: #c5482a;
  --gold: #d7a94b;
  --term: #5fb98c;
  --line: rgba(236, 227, 210, 0.14);
  --card: #1d1a28;
  --card-edge: rgba(236, 227, 210, 0.08);
  --shadow: 28px 28px 70px rgba(0, 0, 0, 0.45);
}

/* ── nền tảng ───────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  /* vân giấy nhẹ */
  background-image: radial-gradient(
      circle at 1px 1px,
      rgba(33, 28, 43, 0.035) 1px,
      transparent 0
    ),
    radial-gradient(120% 80% at 50% -10%, var(--paper-2), var(--paper) 60%);
  background-size: 22px 22px, 100% 100%;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

.wrap {
  width: min(var(--wrap), calc(100% - 48px));
  margin-inline: auto;
}

.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;
}

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

::selection {
  background: var(--son);
  color: var(--paper);
}

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── dấu thanh trôi nền ─────────────────────────────────────────── */
.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.ambient span {
  position: absolute;
  left: var(--x);
  top: var(--y);
  font-family: var(--serif);
  font-size: clamp(3rem, 9vw, 7rem);
  color: var(--son);
  opacity: 0.05;
  animation: drift 14s var(--d) ease-in-out infinite;
}
[data-theme="dark"] .ambient span {
  opacity: 0.08;
}
@keyframes drift {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-26px) rotate(6deg);
  }
}

/* ── nút chung ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  padding: 0.85em 1.5em;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease),
    background-color 0.18s var(--ease);
}
.btn:active {
  transform: translateY(1px) scale(0.99);
}
.btn-primary {
  background: var(--son);
  color: #fdf7ec;
  box-shadow: 0 10px 24px -10px var(--son);
}
.btn-primary:hover {
  background: var(--son-deep);
  transform: translateY(-2px);
  box-shadow: 0 16px 30px -12px var(--son);
}
.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--ink);
  transform: translateY(-2px);
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1.5px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 1.05rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color 0.2s, transform 0.2s;
}
.icon-btn:hover {
  border-color: var(--son);
  transform: rotate(-12deg);
}

.eyebrow {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  color: var(--son);
  margin: 0 0 1rem;
  font-weight: 500;
}

/* ── header ─────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  transition: background-color 0.3s, border-color 0.3s, padding 0.3s;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.9rem 0;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 700;
}
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--son);
  color: #fdf7ec;
  font-family: var(--serif);
  font-weight: 800;
  border-radius: 10px;
  font-size: 1.15rem;
  box-shadow: 0 6px 16px -8px var(--son);
}
.brand-name {
  font-family: var(--serif);
  font-size: 1.3rem;
  letter-spacing: 0.01em;
}
.brand-key {
  color: var(--son);
}
.nav {
  display: flex;
  gap: 1.7rem;
  font-weight: 500;
  font-size: 0.95rem;
}
.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  position: relative;
  transition: color 0.2s;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--son);
  transition: width 0.22s var(--ease);
}
.nav a:hover {
  color: var(--ink);
}
.nav a:hover::after {
  width: 100%;
}
.header-tools {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.lang-switch {
  display: inline-flex;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 0.78rem;
}
.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--ink-faint);
  padding: 0.4em 0.7em;
  cursor: pointer;
  font-family: inherit;
  transition: background-color 0.2s, color 0.2s;
}
.lang-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}
.gh-link {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.5em 1em;
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  transition: background-color 0.2s, color 0.2s;
}
.gh-link:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ── hero ───────────────────────────────────────────────────────── */
.hero {
  position: relative;
  z-index: 1;
  padding: clamp(3rem, 7vw, 6rem) 0 clamp(3rem, 6vw, 5rem);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero-title {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin: 0 0 1.3rem;
}
.hero-title span {
  display: block;
}
.hero-title .accent {
  color: var(--son);
  font-style: italic;
  font-weight: 500;
}
.lead {
  font-size: clamp(1.05rem, 1.5vw, 1.22rem);
  color: var(--ink-soft);
  max-width: 34ch;
  margin: 0 0 2rem;
}
.hero-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.hero-badges {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-faint);
}
.hero-badges li {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--term);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--term) 22%, transparent);
}

/* demo card */
.hero-demo {
  display: grid;
  gap: 1.1rem;
}
.demo-card {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: var(--r);
  padding: 1.6rem 1.6rem 1.9rem;
  box-shadow: var(--shadow);
  position: relative;
}
.demo-chrome {
  display: flex;
  gap: 7px;
  margin-bottom: 1.3rem;
}
.demo-chrome span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--line);
}
.demo-chrome span:first-child {
  background: var(--son);
}
.demo-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.demo-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
}
.demo-telex {
  font-family: var(--mono);
  font-size: 1.25rem;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  min-height: 1.5em;
}
.demo-arrow {
  text-align: center;
  color: var(--gold);
  font-size: 1.4rem;
  margin: 0.4rem 0;
  animation: nudge 1.8s ease-in-out infinite;
}
@keyframes nudge {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.6;
  }
  50% {
    transform: translateY(4px);
    opacity: 1;
  }
}
.demo-result .demo-viet {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.2rem, 4vw, 3rem);
  color: var(--ink);
  min-height: 1.2em;
  display: flex;
  align-items: baseline;
}
.caret {
  display: inline-block;
  width: 3px;
  height: 1.1em;
  background: var(--son);
  margin-left: 4px;
  animation: blink 1s steps(1) infinite;
  transform: translateY(0.12em);
}
@keyframes blink {
  50% {
    opacity: 0;
  }
}
.drop {
  display: inline-block;
  animation: dropIn 0.32s var(--ease) both;
}
@keyframes dropIn {
  from {
    transform: translateY(-0.5em);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.install-peek {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: 12px;
  padding: 0.7rem 0.7rem 0.7rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  overflow: hidden;
}
.install-peek code {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cmd-dim {
  color: var(--term);
  margin-right: 0.4em;
}
.copy-btn {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  border: 1px solid color-mix(in srgb, var(--paper) 30%, transparent);
  background: transparent;
  color: var(--paper);
  padding: 0.4em 0.8em;
  border-radius: 7px;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
}
.copy-btn:hover {
  background: color-mix(in srgb, var(--paper) 14%, transparent);
}
.copy-btn.is-copied {
  border-color: var(--term);
  color: var(--term);
}

/* ── khối section chung ─────────────────────────────────────────── */
.section {
  position: relative;
  z-index: 1;
  padding: clamp(3.5rem, 8vw, 7rem) 0;
}
.section-head {
  max-width: 42rem;
  margin-bottom: 3rem;
}
.section-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}
.section-lead {
  font-size: 1.1rem;
  color: var(--ink-soft);
  margin: 0;
}

/* ── sân chơi gõ thử ────────────────────────────────────────────── */
.section-try {
  background: linear-gradient(180deg, transparent, var(--paper-2) 50%, transparent);
}
.play {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: var(--r);
  padding: clamp(1.4rem, 3vw, 2.2rem);
  box-shadow: var(--shadow);
}
.play-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: 1rem;
}
.control-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--ink-faint);
}
.method-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.method-switch button {
  border: 1.5px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.35em 0.9em;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}
.method-switch button[aria-pressed="true"] {
  background: var(--term);
  border-color: var(--term);
  color: #fff;
}
.link-btn {
  border: 0;
  background: transparent;
  color: var(--ink-faint);
  font-family: var(--sans);
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link-btn:hover {
  color: var(--son);
}
.play-input {
  width: 100%;
  resize: vertical;
  font-family: var(--mono);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  line-height: 1.5;
  transition: border-color 0.2s;
}
.play-input:focus {
  outline: none;
  border-color: var(--son);
}
.play-output {
  margin-top: 1rem;
  min-height: 3.4em;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.35;
  color: var(--ink);
  padding: 0.8rem 0.2rem;
  border-top: 1px dashed var(--line);
  word-break: break-word;
}
.play-output.is-empty {
  color: var(--ink-faint);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 1.05rem;
  font-style: italic;
}
.examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.2rem;
}
.chip {
  font-family: var(--mono);
  font-size: 0.82rem;
  border: 1.5px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  padding: 0.4em 0.9em;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.18s var(--ease);
}
.chip:hover {
  border-color: var(--son);
  color: var(--son);
  transform: translateY(-2px);
}

/* ── lưới tính năng ─────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: var(--r);
  padding: 1.8rem;
  transition: transform 0.25s var(--ease), border-color 0.25s, box-shadow 0.25s;
}
.feature-card:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--son) 40%, var(--card-edge));
  box-shadow: 0 22px 40px -28px var(--son);
}
.feature-glyph {
  font-family: var(--serif);
  font-size: 1.7rem;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: color-mix(in srgb, var(--gold) 16%, transparent);
  color: var(--gold);
  margin-bottom: 1.1rem;
}
.feature-card h3 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
}
.feature-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* ── cài đặt ────────────────────────────────────────────────────── */
.section-install {
  background: linear-gradient(180deg, transparent, var(--paper-3) 60%, transparent);
}
.install-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.after-steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 1.6rem 0;
  display: grid;
  gap: 0.9rem;
}
.after-steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.4rem;
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.55;
}
.after-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 1.65rem;
  height: 1.65rem;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--son);
  background: color-mix(in srgb, var(--son) 12%, transparent);
  border-radius: 50%;
}
.after-steps b {
  color: var(--ink);
  font-weight: 600;
}
.after-steps code,
.install-req code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--paper-3);
  color: var(--ink);
  padding: 0.1em 0.4em;
  border-radius: 5px;
}

.install-req {
  font-size: 0.92rem;
  color: var(--ink-faint);
  border-left: 2px solid var(--gold);
  padding-left: 1rem;
  margin: 1.5rem 0;
}
.arch-badges {
  display: flex;
  gap: 0.6rem;
}
.arch {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.35em 0.9em;
  border: 1.5px solid var(--line);
  border-radius: 8px;
  color: var(--ink-soft);
}
.tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}
.tabs button {
  font-family: var(--mono);
  font-size: 0.82rem;
  border: 1.5px solid var(--line);
  background: transparent;
  color: var(--ink-faint);
  padding: 0.5em 1em;
  border-radius: 9px;
  cursor: pointer;
  transition: all 0.2s;
}
.tabs button[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
.term {
  position: relative;
  background: #181520;
  border: 1px solid rgba(236, 227, 210, 0.1);
  border-radius: 14px;
  padding: 1.1rem 1.2rem 1.2rem;
  box-shadow: var(--shadow);
}
.term-chrome {
  display: flex;
  gap: 7px;
  margin-bottom: 0.9rem;
}
.term-chrome span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(236, 227, 210, 0.18);
}
.term-chrome span:first-child {
  background: var(--son);
}
.term-body {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.7;
  color: #ece3d2;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.term-body code {
  color: #ece3d2;
}
.term-copy {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
}
.term-note {
  margin: 0.9rem 0 0;
  font-size: 0.82rem;
  color: rgba(236, 227, 210, 0.6);
  font-family: var(--sans);
}

/* ── câu chuyện ─────────────────────────────────────────────────── */
.story-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.story-portrait {
  margin: 0;
  position: relative;
}
.story-portrait img {
  width: 100%;
  border-radius: var(--r);
  filter: sepia(0.22) contrast(1.02);
  border: 1px solid var(--card-edge);
  box-shadow: var(--shadow);
}
.story-portrait::before {
  content: "";
  position: absolute;
  inset: 14px -14px -14px 14px;
  border: 1.5px solid var(--gold);
  border-radius: var(--r);
  z-index: -1;
  opacity: 0.5;
}
.story-portrait figcaption {
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-top: 0.9rem;
  font-style: italic;
}
.story-p {
  font-size: 1.08rem;
  color: var(--ink-soft);
  margin: 0 0 1.1rem;
}
.timeline {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: grid;
  gap: 0;
  border-left: 2px solid var(--line);
}
.timeline li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  padding: 0.7rem 0 0.7rem 1.3rem;
  position: relative;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 1.15rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2.5px solid var(--son);
}
.t-year {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--son);
  font-size: 0.95rem;
}
.t-now {
  font-size: 1.3rem;
  line-height: 1;
}
.t-text {
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* ── CTA ────────────────────────────────────────────────────────── */
.section-cta {
  text-align: center;
}
.cta-inner {
  background: var(--ink);
  color: var(--paper);
  border-radius: 28px;
  padding: clamp(2.6rem, 6vw, 4.5rem) clamp(1.5rem, 4vw, 3rem);
  position: relative;
  overflow: hidden;
}
.cta-inner::before {
  content: "ế ữ ợ ậ";
  position: absolute;
  inset: 0;
  font-family: var(--serif);
  font-size: 9rem;
  color: var(--son);
  opacity: 0.08;
  display: grid;
  place-items: center;
  letter-spacing: 0.3em;
  pointer-events: none;
}
.cta-inner h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin: 0 0 0.8rem;
  position: relative;
}
.cta-inner p {
  color: color-mix(in srgb, var(--paper) 75%, transparent);
  margin: 0 0 2rem;
  position: relative;
}
.cta-actions {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}
.section-cta .btn-ghost {
  color: var(--paper);
  border-color: color-mix(in srgb, var(--paper) 35%, transparent);
}
.section-cta .btn-ghost:hover {
  background: color-mix(in srgb, var(--paper) 12%, transparent);
  border-color: var(--paper);
}

/* ── footer ─────────────────────────────────────────────────────── */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 3rem 0;
  margin-top: 2rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.footer-brand .brand-name {
  font-size: 1.4rem;
}
.footer-brand p {
  margin: 0.5rem 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  max-width: 32ch;
}
.footer-made {
  color: var(--ink-faint) !important;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  font-size: 0.95rem;
}
.footer-links a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--son);
}

/* ── lộ dần khi cuộn ────────────────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ── responsive ─────────────────────────────────────────────────── */
@media (max-width: 940px) {
  .hero-grid,
  .install-grid,
  .story-grid {
    grid-template-columns: 1fr;
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav {
    display: none;
  }
  .story-portrait {
    max-width: 360px;
  }
}
@media (max-width: 560px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .header-tools .gh-link {
    display: none;
  }
  .hero-actions .btn {
    flex: 1;
    justify-content: center;
  }
  .play-controls {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-inner {
    flex-direction: column;
  }
}

/* ── tôn trọng giảm chuyển động ─────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}