:root {
  --bg: #edeeef;
  --surface: #ffffff;
  --ink: #1b2430;
  --ink-muted: #5b6472;
  --ink-faint: #889099;
  --accent: #3e6259;
  --accent-strong: #2c4841;
  --accent-soft: #e3ece9;
  --rule: #d7d9dc;
  --brass: #a9824f;
  --brass-soft: #f2e8d9;
  --focus: #2c4841;
  --font-heading: "Source Serif 4", "Noto Serif TC", serif;
  --font-body: "Source Sans 3", "Noto Sans TC", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181b;
    --surface: #1c2226;
    --ink: #e7e9ea;
    --ink-muted: #9aa3aa;
    --ink-faint: #6b737a;
    --accent: #7fb0a2;
    --accent-strong: #a8cec1;
    --accent-soft: #22322f;
    --rule: #2c3438;
    --brass: #c9a56e;
    --brass-soft: #2f2a1f;
    --focus: #a8cec1;
  }
}

:root[data-theme="dark"] {
  --bg: #14181b;
  --surface: #1c2226;
  --ink: #e7e9ea;
  --ink-muted: #9aa3aa;
  --ink-faint: #6b737a;
  --accent: #7fb0a2;
  --accent-strong: #a8cec1;
  --accent-soft: #22322f;
  --rule: #2c3438;
  --brass: #c9a56e;
  --brass-soft: #2f2a1f;
  --focus: #a8cec1;
}

* { box-sizing: border-box; }

html[data-lang="zh"] { --font-heading-active: "Noto Serif TC", serif; --font-body-active: "Noto Sans TC", sans-serif; }
html[data-lang="en"] { --font-heading-active: "Source Serif 4", serif; --font-body-active: "Source Sans 3", sans-serif; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body-active, var(--font-body));
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Doubled attribute selector, not a typo: bumps specificity above any
   single-class component rule (e.g. .status-pill's own `display`), so the
   default hidden state always wins regardless of what else styles the
   element, without needing !important. */
[data-lang-content][data-lang-content] { display: none; }
html[data-lang="zh"] [data-lang-content="zh"] { display: revert; }
html[data-lang="en"] [data-lang-content="en"] { display: revert; }
html[data-lang="zh"] span[data-lang-content="zh"],
html[data-lang="zh"] a[data-lang-content="zh"] { display: inline; }
html[data-lang="en"] span[data-lang-content="en"],
html[data-lang="en"] a[data-lang-content="en"] { display: inline; }

a { color: var(--accent-strong); text-underline-offset: 0.15em; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 3px; }

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* ---------- Header ---------- */
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 22px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  background: var(--accent-soft);
  border-radius: 10px;
  font-size: 20px;
  overflow: hidden;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-family: var(--font-heading-active, var(--font-heading)); font-size: 1.15rem; font-weight: 700; color: var(--ink); }
.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.site-nav { display: flex; align-items: center; gap: 18px; font-size: 0.92rem; }
.site-nav a { color: var(--ink-muted); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 3px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.lang-toggle button {
  border: none;
  background: transparent;
  color: var(--ink-muted);
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.03em;
}
.lang-toggle button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--surface);
}

/* ---------- Layout: rail + column ---------- */
.layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 56px;
  padding-top: 36px;
  max-width: 1120px;
  margin: 0 auto;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .rail { display: none; }
}

.rail { position: sticky; top: 32px; align-self: start; }
.rail-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 12px;
}
.rail nav { display: flex; flex-direction: column; gap: 2px; }
.rail a {
  display: flex;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 0.92rem;
}
.rail a:hover { background: var(--accent-soft); color: var(--ink); }
.rail a .tag { font-family: var(--font-mono); color: var(--brass); font-size: 0.85em; }

.doc-meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-faint);
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin: 0 0 8px;
}

.lede {
  font-family: var(--font-heading-active, var(--font-heading));
  font-size: clamp(1.7rem, 3vw, 2.15rem);
  font-weight: 700;
  text-wrap: balance;
  margin: 4px 0 14px;
}

.standfirst {
  color: var(--ink-muted);
  font-size: 1.05rem;
  max-width: 62ch;
  margin: 0 0 8px;
}

section.doc-section {
  margin-top: 52px;
  padding-top: 8px;
}
section.doc-section:first-of-type { margin-top: 40px; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 10px;
  margin-bottom: 18px;
}
.section-mark {
  font-family: var(--font-mono);
  color: var(--brass);
  font-size: 0.95rem;
  flex-shrink: 0;
}
.section-head h2 {
  font-family: var(--font-heading-active, var(--font-heading));
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  text-wrap: balance;
}

h3 {
  font-family: var(--font-heading-active, var(--font-heading));
  font-size: 1.12rem;
  font-weight: 700;
  margin: 26px 0 8px;
}
.doc-section > h3:first-of-type { margin-top: 4px; }

p { margin: 0 0 14px; max-width: 66ch; }
ul, ol { margin: 0 0 14px; padding-left: 1.3em; max-width: 64ch; }
li { margin-bottom: 6px; }
strong { color: var(--ink); }

.callout {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: 0.95rem;
  color: var(--ink-muted);
}
.callout strong { color: var(--ink); }

.fact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
  margin: 20px 0 26px;
}
.fact {
  background: var(--surface);
  padding: 16px 18px;
}
.fact-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 6px;
}
.fact-value { font-size: 0.94rem; color: var(--ink); }

table.policy-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 26px;
  font-size: 0.93rem;
}
.table-scroll { overflow-x: auto; }
table.policy-table th, table.policy-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
table.policy-table th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}

.disclaimer-box {
  background: var(--brass-soft);
  border: 1px solid var(--brass);
  border-radius: 10px;
  padding: 20px 22px;
  margin: 20px 0;
}
.disclaimer-box p:last-child { margin-bottom: 0; }

@media (prefers-reduced-motion: no-preference) {
  section.doc-section { animation: rise 0.4s ease both; }
  @keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
}

/* ---------- Marketing/support page extras ---------- */
.simple-page { max-width: 1120px; margin: 0 auto; padding-top: 36px; }

.hero-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 48px;
  padding: 56px 0 64px;
}
@media (max-width: 860px) {
  .hero-row { gap: 32px; padding: 40px 0 48px; }
}

.hero { 
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 800px;
}
.hero .brand-mark { width: 80px; height: 80px; margin: 0 0 24px; border-radius: 20px; font-size: 34px; box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.hero h1 {
  font-family: var(--font-heading-active, var(--font-heading));
  font-size: clamp(2.4rem, 4.5vw, 3.4rem);
  font-weight: 700;
  margin: 0 0 16px;
  text-wrap: balance;
  line-height: 1.15;
}
.hero p { margin: 0; color: var(--ink-muted); font-size: 1.15rem; line-height: 1.6; max-width: 66ch; }

.scenario {
  width: 100%;
  max-width: 720px; /* Constrains the image size */
}

.scenario-split {
  display: flex;
  flex-direction: row;
  gap: 24px;
  width: 100%;
}
@media (max-width: 600px) {
  .scenario-split { flex-direction: column; }
}

.scenario-panel {
  flex: 1;
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--rule);
  background: var(--surface);
  transform: translateZ(0);
}

.scenario-panel-crop {
  width: 100%;
  padding-bottom: 108.17%;
  position: relative;
  overflow: hidden;
}

.scenario-panel-crop img {
  position: absolute;
  left: 0;
  width: 100%;
  height: 200%;
  object-fit: cover;
  display: block;
}

.scenario-panel.bad img { top: 0; }
.scenario-panel.good img { top: -100%; }

.panel-label {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 6px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
  color: #141413;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border: 1px solid rgba(0,0,0,0.05);
  z-index: 10;
}
html[data-theme="dark"] .panel-label, @media (prefers-color-scheme: dark) { .panel-label { background: rgba(0, 0, 0, 0.7); color: #fff; border: 1px solid rgba(255,255,255,0.1); } }

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin: 0 0 48px;
}
.screenshot {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 20px;
  padding: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.screenshot img { display: block; width: 100%; border-radius: 14px; }

.screenshot-media { position: relative; }
.demo-photo {
  position: absolute;
  left: 5%;
  top: 63%;
  width: 74%;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 5px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
  transform: rotate(-4deg);
}
.demo-photo img { display: block; width: 100%; border-radius: 5px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 12px 0 48px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 20px;
}
.feature-card .icon { font-size: 1.6rem; margin-bottom: 10px; }
.feature-card h3 { margin: 0 0 6px; font-size: 1.02rem; }
.feature-card p { margin: 0; font-size: 0.92rem; color: var(--ink-muted); max-width: none; }

.faq-item { margin-bottom: 28px; }
.faq-item h3 { margin-bottom: 6px; }

.status-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-strong);
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 16px;
  text-decoration: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.status-pill:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

html[data-lang="zh"] .status-pill[data-lang-content="zh"],
html[data-lang="en"] .status-pill[data-lang-content="en"] {
  display: inline-block;
}

.download-cta {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 24px;
}

.app-store-badge {
  display: inline-block;
  line-height: 0;
  text-decoration: none;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.app-store-badge:hover {
  transform: translateY(-2px);
  opacity: 0.88;
}

.app-store-badge img {
  height: 48px;
  width: auto;
  display: block;
}

html[data-lang="zh"] a.app-store-badge[data-lang-content="zh"],
html[data-lang="en"] a.app-store-badge[data-lang-content="en"] {
  display: inline-block;
}

.bottom-cta {
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 20px;
  padding: 48px 24px;
  margin: 20px 0 32px;
}

.bottom-cta h2 {
  font-family: var(--font-heading-active, var(--font-heading));
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin: 0 0 12px;
  line-height: 1.2;
}

.bottom-cta p {
  color: var(--ink-muted);
  font-size: 1.05rem;
  max-width: 50ch;
  margin: 0 auto;
}