:root {
  color-scheme: light;
  --navy: #070f2b;
  --navy-2: #0b173c;
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --line: #e6eaf2;
  --line-strong: #d7deea;
  --text: #0f172a;
  --muted: #56637a;
  --on-dark: #ffffff;
  --on-dark-muted: #aab9d9;
  --on-dark-dim: #8ea1c8;
  --accent: #2563eb;
  --accent-2: #4f46e5;
  --accent-soft: #7fb0ff;
  --radius: 18px;
  --pill: 999px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 10px 26px rgba(15, 23, 42, 0.07);
  --wrap: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Hiragino Sans", "Noto Sans CJK JP",
    "Yu Gothic UI", "Malgun Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

h1, h2, h3 { line-height: 1.28; margin: 0 0 0.5em; letter-spacing: -0.01em; }

h1 { font-size: clamp(2.2rem, 1.4rem + 3.2vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 1.25rem + 1.5vw, 2.25rem); font-weight: 800; }
h3 { font-size: 1.06rem; font-weight: 700; letter-spacing: 0; }

p { margin: 0 0 1rem; }

/* ---------- masthead ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.masthead-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 72px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  flex: 0 0 auto;
}

.brand-mark { border-radius: 8px; }
.brand-word { height: 28px; width: auto; }

.nav {
  display: flex;
  gap: 4px;
  flex: 1 1 auto;
  flex-wrap: wrap;
  margin-left: auto;
}

.nav a {
  color: #475569;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 550;
  padding: 7px 11px;
  border-radius: var(--pill);
}

.nav a:hover,
.nav a:focus-visible { color: var(--accent); background: var(--bg-soft); }

.lang-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--muted);
}

select {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  padding: 6px 12px;
}

.masthead-cta { flex: 0 0 auto; }

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

.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 650;
  font-size: 0.98rem;
  padding: 13px 26px;
  border-radius: var(--pill);
  border: 1px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover { background: #1d4ed8; }

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.36);
  color: var(--on-dark);
}

.btn-ghost:hover { background: rgba(255, 255, 255, 0.1); }

.btn-sm { padding: 9px 18px; font-size: 0.9rem; }

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

.hero {
  background:
    radial-gradient(900px 460px at 78% 6%, rgba(45, 92, 215, 0.42), transparent 60%),
    radial-gradient(700px 420px at 6% 90%, rgba(79, 70, 229, 0.28), transparent 62%),
    var(--navy);
  color: var(--on-dark);
  padding: 74px 0 62px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 44px;
  align-items: center;
}

.eyebrow {
  color: var(--accent-soft);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.hero h1 { margin-bottom: 0.3em; }

.lede {
  color: var(--on-dark-muted);
  font-size: 1.08rem;
  max-width: 46ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 16px;
}

.hero-note {
  color: var(--on-dark-dim);
  font-size: 0.9rem;
  max-width: 48ch;
  margin: 0;
}

.hero-art {
  display: flex;
  justify-content: center;
}

.hero-art svg {
  width: 100%;
  max-width: 430px;
  height: auto;
}

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

.steps-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.step-card {
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius);
  padding: 22px 22px 18px;
}

.step-no {
  display: block;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, var(--accent-2));
  color: #fff;
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 32px;
  text-align: center;
  margin-bottom: 12px;
}

.step-card h3 { margin-bottom: 5px; }

.step-card p {
  color: var(--on-dark-muted);
  font-size: 0.95rem;
  margin: 0;
}

.steps-foot {
  max-width: var(--wrap);
  margin: 22px auto 0;
  padding: 0 24px;
  color: var(--accent-soft);
  font-size: 0.92rem;
  text-align: center;
}

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

.section { padding: 78px 0; }

.section-title { text-align: center; }

.section-sub {
  color: var(--muted);
  max-width: 66ch;
  margin: -0.3rem auto 0;
  text-align: center;
}

.section-soft {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-dark {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);
  color: var(--on-dark);
}

.section-dark .section-sub,
.section-dark .gallery-foot { color: var(--on-dark-muted); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}

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

.card p { color: var(--muted); font-size: 0.97rem; margin: 0; }

.ico {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: linear-gradient(135deg, #3b82f6, var(--accent-2));
  color: #fff;
}

.ico svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- web edition ---------- */

.section-web .eyebrow {
  color: var(--accent);
  text-align: center;
  margin-bottom: 6px;
}

.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 10px;
  border: 1px solid #f0dcb3;
  border-radius: var(--pill);
  background: #fdf0d5;
  color: #7a4b00;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: none;
  vertical-align: 2px;
}

.web-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 34px;
}

.web-point {
  background: var(--bg);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.web-point h3 { margin-bottom: 6px; }

.web-point p { color: var(--muted); font-size: 0.95rem; margin: 0; }

.web-note {
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 68ch;
  margin: 24px auto 0;
  text-align: center;
}

.web-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.btn-outline {
  background: var(--bg);
  border-color: var(--line-strong);
  color: var(--text);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.dl-plain { color: var(--muted); font-size: 0.85rem; }

/* ---------- gallery ---------- */

.shot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 34px;
  /* 04 是竖屏截图，比另外三张高得多；不写 start 会让矮的那张被拉伸出空白。 */
  align-items: start;
}

.shot {
  margin: 0;
  background: var(--bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(3, 10, 28, 0.42);
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: contain;
  background: var(--bg-soft);
}

.shot figcaption {
  padding: 16px 20px 18px;
  border-top: 1px solid var(--line);
  color: var(--text);
}

.shot figcaption strong {
  display: block;
  font-size: 0.99rem;
  margin-bottom: 3px;
}

.shot figcaption span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.gallery-foot {
  font-size: 0.9rem;
  margin: 26px 0 0;
  text-align: center;
}

/* ---------- platforms ---------- */

.plat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 36px;
}

.plat {
  background: var(--bg);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.plat h3 { margin-bottom: 6px; }

.plat p { color: var(--muted); font-size: 0.96rem; margin: 0; }

/* ---------- download table ---------- */

.table-scroll {
  margin-top: 30px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.dl-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.dl-table th,
.dl-table td {
  text-align: left;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.dl-table th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.dl-table td strong { display: block; margin-bottom: 6px; }

.dl-table code {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.8rem;
  color: var(--muted);
  word-break: break-all;
  line-height: 1.5;
}

.dl-table code.sha { margin-top: 4px; font-size: 0.72rem; color: #5f7089; }

.dl-table td:nth-child(2) { white-space: nowrap; }

.dl-foot {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 20px 0 0;
}

/* ---------- faq ---------- */

.faq { margin: 34px 0 0; }

.faq-item {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 12px;
}

.faq dt { font-weight: 700; margin-bottom: 6px; }

.faq dd { margin: 0; color: var(--muted); font-size: 0.97rem; }

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

.foot {
  background: var(--navy);
  color: var(--on-dark-muted);
  padding: 40px 0 44px;
}

.foot-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 40px;
  align-items: center;
}

.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--on-dark);
  font-weight: 700;
}

.foot-meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  font-size: 0.9rem;
}

.foot-meta a { color: var(--on-dark-muted); }
.foot-meta a:hover { color: var(--on-dark); }

.foot-note {
  font-size: 0.88rem;
  color: var(--on-dark-dim);
  margin: 0;
  flex: 1 1 260px;
}

/* ---------- narrow ---------- */

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-art { display: none; }
  .steps-row { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 52px 0 46px; }
  .section { padding: 58px 0; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  /* 页眉在手机上只留两行：导航改横向滑动，重复的下载按钮让给 hero，字标让给图标。 */
  .brand-word { display: none; }
  .nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { flex: 0 0 auto; }
  .masthead-cta { display: none; }
  .lang-picker { margin-left: auto; }
  .card-grid,
  .plat-grid,
  .web-grid,
  .shot-grid { grid-template-columns: 1fr; }
  .cta-row .btn,
  .web-cta .btn { flex: 1 1 auto; }
  .dl-table { font-size: 0.9rem; }
  .dl-table th,
  .dl-table td { padding: 13px 8px; }
  /* 表头不许 nowrap，否则 390px 上下载按钮会被推到横向滚动区外面。 */
  .dl-table th,
  .dl-table td:nth-child(2) { white-space: normal; }
  .foot-grid { flex-direction: column; align-items: flex-start; }
}

/* 韩文不许在词中间断行；中日文按 CJK 常规断行，不改这条。 */
body[data-locale="ko"] { word-break: keep-all; }