/* Koushi website. Palette follows the brand mark: lattice navy, grid blue, photon cyan. */
:root {
  --navy: #13233f;
  --grid: #3e72b8;
  --photon: #8fe9ff;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #17202e;
  --muted: #546072;
  --line: #dde3ec;
  --accent: #2a5fa8;
  --accent-text: #ffffff;
  --shadow: 0 18px 48px rgba(19, 35, 63, 0.16);
  color-scheme: light dark;
  font-family: "Inter", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans CJK JP", "Noto Sans JP",
    "PingFang SC", "Microsoft YaHei", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
}

:lang(zh-Hans) { font-family: "Inter", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif; }
:lang(zh-Hant) { font-family: "Inter", "PingFang TC", "Noto Sans CJK TC", "Microsoft JhengHei", system-ui, sans-serif; }
:lang(ko) { font-family: "Inter", "Apple SD Gothic Neo", "Noto Sans CJK KR", "Malgun Gothic", system-ui, sans-serif; }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1626;
    --surface: #142036;
    --text: #e7edf6;
    --muted: #a3b0c2;
    --line: #26344d;
    --accent: #8fe9ff;
    --accent-text: #0d1626;
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; display: block; }

h1, h2 { line-height: 1.25; letter-spacing: -0.01em; text-wrap: balance; }
/* Break Japanese headings at phrase boundaries instead of mid-word (Chromium). */
:lang(ja) :is(h1, h2, .lede) { word-break: auto-phrase; }
h2 { font-size: clamp(1.4rem, 1.1rem + 1.2vw, 2rem); margin: 0 0 0.6em; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 14px clamp(16px, 4vw, 48px);
  background: var(--navy);
  color: #fff;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
}

.header-end { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 20px; }

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid rgba(207, 224, 247, 0.4);
  border-radius: 999px;
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}
.github-link:hover { border-color: var(--photon); color: var(--photon); }

.languages {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
}
.languages a { color: #cfe0f7; text-decoration: none; }
.languages a:hover { color: var(--photon); }
.languages [aria-current] { color: var(--photon); font-weight: 600; }

.translating-note {
  margin: 0;
  padding: 10px clamp(16px, 4vw, 48px);
  background: #fff4d6;
  color: #5a4300;
  font-size: 0.92rem;
}

main { overflow-x: clip; }

main > section {
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) clamp(16px, 4vw, 48px);
}

/* Hero: navy band with a faint lattice, the main screenshot overlapping below. */
.hero {
  position: relative;
  max-width: none !important;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  justify-items: center;
  text-align: center;
  color: #fff;
  background:
    radial-gradient(circle at 50% 18%, rgba(143, 233, 255, 0.22), transparent 42%),
    linear-gradient(rgba(62, 114, 184, 0.18) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(90deg, rgba(62, 114, 184, 0.18) 1px, transparent 1px) 0 0 / 44px 44px,
    var(--navy);
  padding-bottom: 0 !important;
}

.hero-text { max-width: 760px; }
.hero h1 { font-size: clamp(1.8rem, 1.2rem + 2.6vw, 3.1rem); margin: 0 0 0.5em; }
.hero .lede { color: #d6e2f3; font-size: clamp(1rem, 0.95rem + 0.3vw, 1.15rem); margin: 0 auto 1.6em; }

.cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 12px 18px; margin: 0 0 1em; }

.button {
  display: inline-block;
  padding: 0.8em 1.4em;
  border-radius: 999px;
  background: var(--photon);
  color: var(--navy);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 0 0 0 rgba(143, 233, 255, 0.5);
  transition: box-shadow 160ms ease;
}
.button:hover { box-shadow: 0 0 0 6px rgba(143, 233, 255, 0.25); }
.button svg { vertical-align: -3px; margin-right: 8px; }
.button.secondary {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(207, 224, 247, 0.55);
}
.button.secondary:hover { border-color: var(--photon); color: var(--photon); box-shadow: none; }

.version { color: #b9c9df; font-size: 0.9rem; }
.other-platforms { color: #b9c9df; font-size: 0.85rem; margin: 0; }
.other-platforms a { color: #cfe0f7; }

.shot { margin: 0; }
.shot a { display: block; }
.shot.narrow { max-width: 760px; margin: 0 auto; }
.shot img {
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--surface);
}

.hero-shot {
  width: min(1120px, 100%);
  margin-bottom: -96px;
  position: relative;
}
.hero-shot img { border-color: rgba(255, 255, 255, 0.12); }

.hero + section { padding-top: calc(96px + clamp(40px, 6vw, 80px)); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: clamp(20px, 3vw, 32px);
}

.matrix { max-width: 860px !important; }
.matrix.card { margin-top: calc(96px + 40px); }
.hero + .matrix { padding-top: clamp(20px, 3vw, 32px); }
.links { display: flex; flex-wrap: wrap; gap: 8px 24px; padding: 0; margin: 0; list-style: none; font-weight: 600; }

.section-lede { color: var(--muted); max-width: 720px; margin: 0 0 2em; }

.pains h2, .features h2, .settings h2 { text-align: left; }

.pain {
  display: grid;
  gap: 20px 40px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.pain.has-shot { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: center; }
.pain.flip .pain-text { order: 2; }

.pain-problem {
  margin: 0 0 0.5em;
  font-weight: 700;
  font-size: 1.08rem;
  padding-left: 1.1em;
  position: relative;
}
.pain-problem::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  background: var(--photon);
  box-shadow: 0 0 0 3px rgba(62, 114, 184, 0.35);
}
.pain-answer { margin: 0; color: var(--muted); padding-left: 1.1em; }

.ai h2 { text-align: left; }
.ai-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.ai h3 { font-size: 1.1rem; margin: 0 0 0.6em; }
.ai-columns ul { margin: 0; padding-left: 1.2em; }
.ai-columns li { margin: 0.35em 0; }
.ai-try { margin-top: 28px; }
.ai-command {
  margin: 0 0 20px;
  padding: 14px 18px;
  border-radius: 12px;
  background: var(--navy);
  border: 1px solid var(--line);
  color: var(--photon);
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
/* Outranks the per-locale :lang() font stacks, which also match <code>. */
.ai-command code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
.ai-try-heading { margin: 0 0 0.5em; font-weight: 700; }
.ai-prompts { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; padding: 0; margin: 0; list-style: none; }
.ai-prompts li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px 16px 16px 4px;
  padding: 8px 14px;
}
.ai-setup { margin-top: 1.5em; color: var(--muted); }
.ai-setup a { font-weight: 600; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  padding: 0;
  margin: 0 0 32px;
  list-style: none;
}
.feature-grid li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
}

.languages-section {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 24px 40px;
  align-items: center;
}

.settings-body {
  display: grid;
  grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  gap: 24px 40px;
  align-items: start;
}
.settings-list { margin: 0; padding-left: 1.2em; }
.settings-list li { margin: 0.25em 0; }
.ask { margin-top: 1.5em; font-weight: 600; }

.fineprint { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.fineprint h2 { font-size: 1.2rem; }
.fineprint p { margin: 0; color: var(--muted); }

.site-footer {
  padding: 32px clamp(16px, 4vw, 48px) 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}
.site-footer ul { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 24px; padding: 0; margin: 0 0 0.8em; list-style: none; }

@media (max-width: 760px) {
  .pain.has-shot,
  .languages-section,
  .settings-body,
  .ai-columns,
  .fineprint { grid-template-columns: 1fr; }
  .pain.flip .pain-text { order: 0; }
  .hero-shot { margin-bottom: -40px; }
  .matrix.card { margin-top: 64px; }
}

@media (prefers-reduced-motion: reduce) {
  .button { transition: none; }
}