/* =====================================================================
   ProjectBay — home page · devbay design family (slate + indigo, Inter)
   ===================================================================== */

/* Inter Variable (offline, latin subsets) */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/inter-latin-ext-wght-normal.woff2') format('woff2-variations');
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF,
    U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/fonts/inter-latin-wght-normal.woff2') format('woff2-variations');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --bg: #f8fafc;
  --bg-soft: #f1f5f9;
  --card: #ffffff;
  --card-strong: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-dim: #475569;
  --text-faint: #94a3b8;
  --accent-1: #6366f1;
  --accent-2: #4f46e5;
  --accent-3: #818cf8;
  --accent-soft: rgba(99, 102, 241, 0.08);
  --on-accent: #ffffff;
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --shadow: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 6px 16px -4px rgba(15, 23, 42, 0.12);
  --font: 'Inter Variable', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC',
    'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
}

[data-theme='dark'] {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --card: #1e293b;
  --card-strong: #0f172a;
  --border: #334155;
  --border-strong: #475569;
  --text: #f1f5f9;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --accent-1: #818cf8;
  --accent-2: #a5b4fc;
  --accent-3: #6366f1;
  --accent-soft: rgba(129, 140, 248, 0.14);
  --on-accent: #0f172a;
  --shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 6px 16px -4px rgba(0, 0, 0, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; color-scheme: light; }
html[data-theme='dark'] { color-scheme: dark; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.25s ease, color 0.25s ease;
}

::selection { background: rgba(99, 102, 241, 0.22); }

.container { width: min(1140px, 94vw); margin: 0 auto; }
#tools, #about { scroll-margin-top: 84px; }

a { color: var(--accent-1); }

button { font-family: inherit; }
kbd.keycap {
  font-family: inherit;
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text-faint);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 3px 6px;
  white-space: nowrap;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 9px;
  text-decoration: none; color: var(--text);
  flex-shrink: 0;
}
.brand-logo { display: flex; align-items: center; }
.brand-logo img { display: block; }
.brand-name { font-size: 1.2rem; font-weight: 800; letter-spacing: -0.02em; }
.brand-accent { color: var(--accent-1); }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  color: var(--text-dim); text-decoration: none;
  font-size: 0.92rem; font-weight: 500;
  padding: 7px 12px; border-radius: var(--radius-sm);
  transition: color 0.15s ease, background-color 0.15s ease;
}
.nav-links a:hover { color: var(--text); background: var(--bg-soft); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.search-trigger {
  display: inline-flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 8px 0 13px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim); font-size: 0.85rem; font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}
.search-trigger:hover { color: var(--text); border-color: var(--border-strong); background: var(--card-strong); }

.lang-wrap { position: relative; display: flex; align-items: center; }
.lang-icon {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  color: var(--text-faint); pointer-events: none;
}
.lang-select {
  appearance: none; -webkit-appearance: none;
  height: 36px; padding: 0 30px 0 32px;
  background: var(--card); color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 999px;
  font-family: inherit; font-size: 0.85rem; font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.lang-select:hover { color: var(--text); border-color: var(--border-strong); }
.lang-wrap::after {
  content: '';
  position: absolute; right: 12px; top: 50%;
  width: 8px; height: 8px;
  border-right: 1.6px solid var(--text-faint);
  border-bottom: 1.6px solid var(--text-faint);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}
.lang-select:focus-visible, .search-trigger:focus-visible { outline: none; }
.lang-select:focus-visible { border-color: var(--accent-1); }

.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; color: var(--text-dim); cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
.icon-moon { display: none; }
[data-theme='light'] .icon-sun { display: none; }
[data-theme='light'] .icon-moon { display: block; }

/* ---------- hero ---------- */
.hero { padding: 76px 0 30px; text-align: center; }
.hero-title {
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  font-weight: 800; letter-spacing: -0.03em;
  line-height: 1.15;
  max-width: 900px; margin: 0 auto;
}
.hero-title span { display: block; }
.hero-accent { color: var(--accent-1); }
.hero-sub {
  max-width: 620px; margin: 18px auto 0;
  color: var(--text-dim); font-size: 1.02rem;
}

.search-box {
  position: relative;
  width: min(560px, 100%);
  margin: 34px auto 0;
  display: flex; align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.search-box:focus-within {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.search-icon {
  flex-shrink: 0;
  margin-left: 18px;
  color: var(--text-faint);
  pointer-events: none;
}
.search-box input {
  flex: 1; min-width: 0;
  height: 52px;
  padding: 0 14px;
  background: none; border: none; outline: none;
  font-family: inherit; font-size: 0.95rem;
  color: var(--text);
}
.search-box input::placeholder { color: var(--text-faint); }
.search-box input::-webkit-search-cancel-button { -webkit-appearance: none; }
.keycap-search { margin-right: 14px; }

.hero-count {
  margin-top: 20px;
  color: var(--text-faint); font-size: 0.88rem; font-weight: 500;
}

.chips {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px; margin-top: 26px;
}
.chip {
  border: 1px solid var(--border);
  background: var(--card); color: var(--text-dim);
  font-family: inherit; font-size: 0.85rem; font-weight: 500;
  padding: 7px 15px; border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.chip:hover { color: var(--text); border-color: var(--border-strong); }
.chip.active {
  background: var(--accent-1); border-color: var(--accent-1);
  color: var(--on-accent);
}
.chip.active:hover { background: var(--accent-2); border-color: var(--accent-2); color: var(--on-accent); }

/* ---------- tools grid ---------- */
.tools-section { padding: 34px 0 78px; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; margin-bottom: 18px;
}
.tools-title {
  font-size: 1.05rem; font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-dim);
}
.grid-meta { color: var(--text-faint); font-size: 0.86rem; }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(244px, 1fr));
  gap: 14px;
}
.tool-card {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
  text-decoration: none; color: var(--text);
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}
.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-1);
  box-shadow: var(--shadow-hover);
}
.tool-card:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}
.tool-top { display: flex; align-items: center; gap: 10px; min-width: 0; }
.tool-emoji { font-size: 1.45rem; line-height: 1; flex-shrink: 0; }
.tool-name { font-size: 1rem; font-weight: 600; letter-spacing: -0.01em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tool-arrow {
  margin-left: auto; flex-shrink: 0;
  color: var(--text-faint);
  opacity: 0;
  transform: translate(-3px, 3px);
  transition: opacity 0.16s ease, transform 0.16s ease, color 0.16s ease;
}
.tool-card:hover .tool-arrow { opacity: 1; transform: translate(0, 0); color: var(--accent-1); }
.tool-card:focus-visible .tool-arrow { opacity: 1; transform: translate(0, 0); color: var(--accent-1); }
.tool-desc {
  color: var(--text-dim); font-size: 0.88rem; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}

.empty-state { padding: 56px 0; text-align: center; }
.empty-msg { color: var(--text-dim); margin-bottom: 18px; }
.empty-clear { margin: 0 auto; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 999px;
  font-family: inherit; font-size: 0.9rem; font-weight: 600;
  text-decoration: none; cursor: pointer;
  transition: all 0.15s ease; border: 1px solid transparent;
}
.btn-ghost {
  background: var(--card); color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--card-strong); border-color: var(--border); }

/* ---------- about ---------- */
.about-section { padding: 26px 0 84px; }
.section-title {
  font-size: clamp(1.55rem, 3.2vw, 2rem);
  font-weight: 800; letter-spacing: -0.02em;
  text-align: center; margin-bottom: 34px;
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}
.about-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 26px 24px;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}
.about-card:hover { transform: translateY(-2px); border-color: var(--border-strong); box-shadow: var(--shadow-hover); }
.about-icon {
  width: 42px; height: 42px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent-1);
  background: var(--accent-soft);
  margin-bottom: 16px;
}
.about-card h3 { font-size: 1.02rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 6px; }
.about-card p { color: var(--text-dim); font-size: 0.9rem; line-height: 1.55; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 34px 0 30px;
  text-align: center;
}
.footer-brand {
  justify-content: center;
  margin-bottom: 14px;
}
.footer-brand .brand-name { font-size: 1.1rem; }
.footer-links { display: flex; justify-content: center; gap: 22px; margin-bottom: 14px; flex-wrap: wrap; }
.footer-links a {
  color: var(--text-dim); text-decoration: none; font-size: 0.9rem;
  transition: color 0.15s ease;
}
.footer-links a:hover { color: var(--accent-1); }
.footer-note { color: var(--text-faint); font-size: 0.86rem; margin-bottom: 8px; }
.footer-copy { color: var(--text-faint); font-size: 0.8rem; opacity: 0.85; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .search-trigger { display: none; }
}
@media (max-width: 700px) {
  .nav-links { display: none; }
  .hero { padding: 56px 0 24px; }
  .hero-sub { font-size: 0.97rem; }
  .header-actions { gap: 8px; }
  .tools-grid { grid-template-columns: 1fr; }
  .tool-card { padding: 18px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- content pages (about, legal, guides) ---------- */
.page-head { padding: 56px 0 24px; }
.page-title {
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  font-weight: 800; letter-spacing: -0.02em; line-height: 1.15;
}
.page-sub { color: var(--text-dim); margin-top: 12px; font-size: 1rem; max-width: 64ch; line-height: 1.6; }
.page-meta { color: var(--text-faint); font-size: 0.84rem; margin-top: 14px; }

.prose { max-width: 76ch; padding-bottom: 72px; }
.prose h2 { font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; margin: 36px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.04rem; font-weight: 650; margin: 26px 0 8px; }
.prose p, .prose li { color: var(--text-dim); line-height: 1.72; font-size: 0.97rem; }
.prose p { margin-bottom: 14px; }
.prose ul, .prose ol { margin: 0 0 16px 22px; }
.prose li { margin-bottom: 8px; }
.prose a { color: var(--accent-1); }
.prose strong { color: var(--text); font-weight: 650; }
.prose code {
  font-size: 0.88em; background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: 4px; padding: 1px 5px;
}

.notice {
  background: var(--accent-soft); border: 1px solid var(--border);
  border-left: 3px solid var(--accent-1);
  border-radius: var(--radius-sm); padding: 14px 16px; margin: 0 0 26px;
}
.notice p { margin: 0; font-size: 0.9rem; color: var(--text-dim); }

.data-table { width: 100%; border-collapse: collapse; margin: 0 0 22px; font-size: 0.9rem; }
.data-table th, .data-table td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.data-table th { background: var(--bg-soft); font-weight: 650; color: var(--text); }
.data-table td { color: var(--text-dim); }

.guide-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(272px, 1fr));
  gap: 14px; padding-bottom: 76px;
}
.guide-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 24px 22px;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}
.guide-card:hover { transform: translateY(-2px); border-color: var(--border-strong); box-shadow: var(--shadow-hover); }
.guide-card h2 { font-size: 1.04rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 8px; color: var(--text); }
.guide-card p { color: var(--text-dim); font-size: 0.9rem; line-height: 1.55; }
.guide-card .guide-more { color: var(--accent-1); font-size: 0.86rem; font-weight: 600; margin-top: 12px; display: block; }

/* ---------- guides section on the home page ---------- */
.guides-section { padding: 6px 0 40px; }
.section-sub {
  color: var(--text-dim); font-size: 0.97rem; text-align: center;
  max-width: 64ch; margin: -20px auto 30px; line-height: 1.6;
}
.guide-card h2, .guide-card h3 {
  font-size: 1.04rem; font-weight: 700; letter-spacing: -0.01em;
  margin-bottom: 8px; color: var(--text);
}