:root {
  --layout-max: 1080px;
  --layout-pad: 28px;
  --header-h: 64px;
  --bg: #f4f6fb;
  --bg-elevated: #ffffff;
  --text: #1d1d1f;
  --muted: #5c5c66;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --border: rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --shadow: 0 20px 50px rgba(30, 45, 90, 0.12);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
  --hero-bg: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* One width for header, main, footer */
.layout {
  width: 100%;
  max-width: var(--layout-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--layout-pad);
  padding-right: var(--layout-pad);
}

/* Header — fixed lang switch slot on the right */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(244, 246, 251, 0.82);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px) saturate(1.25);
}

.site-header__bar {
  height: var(--header-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  font-size: 1.02rem;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.22);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 20px;
  font-size: 0.92rem;
}

.site-nav a {
  color: var(--muted);
}

.site-nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.lang-switch a {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
}

.lang-switch a:hover {
  text-decoration: none;
  color: var(--text);
}

.lang-switch a.is-active {
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Legacy floating hero icon — must not appear */
.icon-float,
.icon-orb {
  display: none !important;
}

.page-home .site-header {
  background: rgba(255, 255, 255, 0.88);
}

/* Hero — copy left, original design visual right (compact, no forced full-screen) */
.hero {
  width: 100%;
  padding: 40px 0 48px;
  background: var(--hero-bg);
  overflow: hidden;
}

.hero__split {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 12px 32px;
  align-items: center;
}

.hero__copy {
  padding: 8px 0;
}

.hero__headline {
  margin: 0;
  font-size: clamp(2rem, 4.8vw, 3.15rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: #000;
}

.hero__lead {
  margin: 28px 0 0;
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  line-height: 1.7;
  color: #1d1d1f;
  max-width: 22em;
}

/* Right art: user-provided hero visual (black bg removed → white) */
.hero__art {
  margin: 0;
  line-height: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: var(--hero-bg);
}

.hero__art img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  background: var(--hero-bg);
  border: 0;
}

/* Second screen — 5 view modes */
.views {
  padding: 56px 0 64px;
  background: #ffffff;
}

.views__split {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 28px 48px;
  align-items: center;
}

.views__gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 500px;
  justify-self: start;
}

.views__shot {
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  line-height: 0;
  background: #f5f5f7;
  box-shadow: 0 10px 28px rgba(30, 45, 90, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.views__shot img {
  display: block;
  width: 100%;
  height: auto;
}

.views__headline {
  margin: 0;
  font-size: clamp(1.85rem, 3.8vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
  color: #000;
}

.views__lead {
  margin: 22px 0 0;
  font-size: clamp(0.98rem, 1.55vw, 1.1rem);
  line-height: 1.75;
  color: #6e6e73;
  max-width: 26em;
}

.views__rule {
  margin: 30px 0 22px;
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.5), rgba(99, 102, 241, 0.06));
}

.views__label {
  margin: 0 0 16px;
  font-size: 0.94rem;
  color: #86868b;
}

.views__modes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.views__modes li {
  position: relative;
  padding-left: 22px;
  font-size: 1.04rem;
  font-weight: 500;
  color: #1d1d1f;
}

.views__modes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.views__shortcut {
  margin-top: 32px;
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 20px;
  border-radius: 14px;
  background: #f5f5f7;
  border: 1px solid var(--border);
}

.views__shortcut-label {
  font-size: 0.8rem;
  color: #86868b;
}

.views__shortcut-keys {
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}

/* Third screen — tag management */
.tags {
  padding: 56px 0 64px;
  background: #ffffff;
}

.tags__split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 28px 48px;
  align-items: center;
}

.tags__headline {
  margin: 0;
  font-size: clamp(1.85rem, 3.8vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
  color: #000;
}

.tags__points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  max-width: 28em;
}

.tags__points li {
  position: relative;
  padding-left: 22px;
  font-size: clamp(0.98rem, 1.55vw, 1.1rem);
  line-height: 1.75;
  color: #1d1d1f;
}

.tags__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.tags__points strong {
  font-weight: 700;
  color: #000;
}

.tags__art {
  margin: 0;
  line-height: 0;
  justify-self: end;
  max-width: 540px;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: #f5f5f7;
  box-shadow: 0 10px 28px rgba(30, 45, 90, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.tags__art img {
  display: block;
  width: 100%;
  height: auto;
}

/* Fourth screen — app memos */
.memo {
  padding: 56px 0 64px;
  background: #ffffff;
}

.memo__split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 28px 48px;
  align-items: center;
}

.memo__art {
  margin: 0;
  line-height: 0;
  justify-self: start;
  max-width: 540px;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: #f5f5f7;
  box-shadow: 0 10px 28px rgba(30, 45, 90, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.memo__art img {
  display: block;
  width: 100%;
  height: auto;
}

.memo__headline {
  margin: 0;
  font-size: clamp(1.85rem, 3.8vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
  color: #000;
}

.memo__lead {
  margin: 22px 0 0;
  font-size: clamp(0.98rem, 1.55vw, 1.1rem);
  line-height: 1.75;
  color: #6e6e73;
  max-width: 22em;
}

/* Fifth screen — global Quick Search */
.search {
  padding: 56px 0 64px;
  background: #ffffff;
}

.search__split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 28px 48px;
  align-items: center;
}

.search__headline {
  margin: 0;
  font-size: clamp(1.85rem, 3.8vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
  color: #000;
}

.search__lead {
  margin: 22px 0 0;
  font-size: clamp(0.98rem, 1.55vw, 1.1rem);
  line-height: 1.75;
  color: #6e6e73;
  max-width: 24em;
}

.search__tagline {
  margin: 16px 0 0;
  font-size: clamp(0.98rem, 1.55vw, 1.1rem);
  line-height: 1.75;
  color: #1d1d1f;
  font-weight: 500;
  max-width: 24em;
}

.search__shortcut {
  margin-top: 32px;
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 20px;
  border-radius: 14px;
  background: #f5f5f7;
  border: 1px solid var(--border);
}

.search__shortcut-label {
  font-size: 0.8rem;
  color: #86868b;
}

.search__shortcut-keys {
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.search__art {
  margin: 0;
  line-height: 0;
  justify-self: end;
  max-width: 460px;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: #f5f5f7;
  box-shadow: 0 10px 28px rgba(30, 45, 90, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.search__art img {
  display: block;
  width: 100%;
  height: auto;
}

/* Sixth screen — backup & restore */
.backup {
  padding: 56px 0 64px;
  background: #ffffff;
}

.backup__split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 28px 48px;
  align-items: center;
}

.backup__art {
  margin: 0;
  line-height: 0;
  justify-self: start;
  max-width: 540px;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: #f5f5f7;
  box-shadow: 0 10px 28px rgba(30, 45, 90, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.backup__art img {
  display: block;
  width: 100%;
  height: auto;
}

.backup__headline {
  margin: 0;
  font-size: clamp(1.85rem, 3.8vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
  color: #000;
}

.backup__lead {
  margin: 22px 0 0;
  font-size: clamp(0.98rem, 1.55vw, 1.1rem);
  line-height: 1.75;
  color: #1d1d1f;
  max-width: 24em;
}

.backup__lead strong {
  font-weight: 700;
  color: #000;
}

/* Main content */
.page-main {
  padding: 56px 0 72px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 32px;
  margin-bottom: 22px;
}

.card h2 {
  margin: 0 0 14px;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.card-cta {
  text-align: center;
}

.card-cta p {
  margin: 0 0 16px;
  color: var(--muted);
}

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

.compare th,
.compare td {
  text-align: left;
  padding: 11px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.compare th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.compare tr:last-child td {
  border-bottom: none;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.feature {
  padding: 15px 17px;
  border-radius: 12px;
  background: #f8f9fd;
  border: 1px solid var(--border);
}

.feature strong {
  display: block;
  margin-bottom: 5px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.94rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 113, 227, 0.28);
}

.btn-primary:hover {
  background: var(--accent-hover);
  text-decoration: none;
  color: #fff;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  text-decoration: none;
}

.site-footer {
  padding: 28px 0 48px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.88rem;
  color: var(--muted);
}

.site-footer p {
  margin: 0 0 8px;
}

.prose h1 {
  margin-top: 0;
}

.prose h2 {
  margin-top: 1.5em;
}

.prose h3 {
  margin-top: 1.2em;
}

kbd {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 0.82em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #f0f2f8;
  border: 1px solid var(--border);
}

@media (max-width: 860px) {
  .site-header__bar {
    grid-template-columns: auto auto;
    grid-template-rows: auto auto;
  }

  .site-nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    order: 3;
  }

  .lang-switch {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .hero__split {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 32px;
  }

  .hero__art {
    justify-content: center;
  }

  .views__split {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .views__gallery {
    max-width: 100%;
    justify-self: center;
  }

  .views__copy {
    max-width: 36em;
  }

  .tags__split {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .tags__art {
    justify-self: center;
    max-width: 100%;
  }

  .memo__split {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .memo__art {
    justify-self: center;
    max-width: 100%;
  }

  .search__split {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .search__art {
    justify-self: center;
    max-width: 100%;
  }

  .backup__split {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .backup__art {
    justify-self: center;
    max-width: 100%;
  }
}

@media (max-width: 560px) {
  :root {
    --layout-pad: 18px;
  }

  .hero {
    padding: 32px 0 48px;
  }
}