/* ============================================================
   umicya · whims — 主题与布局
   ============================================================ */

/* ---- 主题变量：默认 light，手动/系统可切 dark ---- */
:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --fg-muted: #666666;
  --fg-faint: #a3a3a3;
  --line: #e4e4e4;
  --line-strong: #1a1a1a;
  --card-bg: #ffffff;
  --shadow: rgba(26, 26, 26, 0.12);
  --glow: rgba(26, 26, 26, 0.06);
}

:root[data-theme="dark"] {
  --bg: #0e0e10;
  --fg: #e8e8ea;
  --fg-muted: #9a9aa2;
  --fg-faint: #5c5c64;
  --line: #26262c;
  --line-strong: #e8e8ea;
  --card-bg: #17171b;
  --shadow: rgba(0, 0, 0, 0.5);
  --glow: rgba(255, 255, 255, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e0e10;
    --fg: #e8e8ea;
    --fg-muted: #9a9aa2;
    --fg-faint: #5c5c64;
    --line: #26262c;
    --line-strong: #e8e8ea;
    --card-bg: #17171b;
    --shadow: rgba(0, 0, 0, 0.5);
    --glow: rgba(255, 255, 255, 0.05);
  }
}

/* ---- reset ---- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Space Grotesk', 'Noto Sans SC', -apple-system, 'Segoe UI',
    'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.35s ease, color 0.35s ease;
}

.mono {
  font-family: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', Consolas,
    monospace;
}

/* ---- 外框 ---- */
.frame {
  position: fixed;
  inset: 14px;
  border: 1px solid var(--line);
  pointer-events: none;
  z-index: 100;
}

/* ---- header ---- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 56px 0;
  flex-wrap: wrap;
  gap: 16px;
}

.wordmark {
  text-decoration: none;
  color: var(--fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
}

.wm-main { font-weight: 500; }
.wm-dot { color: var(--fg-faint); }
.wm-sub { color: var(--fg-muted); }

.nav {
  display: flex;
  gap: 26px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
}

.nav a {
  color: var(--fg-muted);
  text-decoration: none;
  position: relative;
  padding-bottom: 3px;
  transition: color 0.2s;
}

.nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--fg);
  transition: width 0.25s ease;
}

.nav a:hover { color: var(--fg); }
.nav a:hover::after { width: 100%; }

.ext { font-size: 0.75em; color: var(--fg-faint); }

/* ---- 主题切换按钮 ---- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg-muted);
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  transition: border-color 0.2s, color 0.2s;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  color: var(--fg);
}

.theme-icon { font-size: 0.9rem; line-height: 1; }
.theme-label { letter-spacing: 0.04em; }

/* ---- main ---- */
main {
  flex: 1;
  padding: 0 56px;
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
}

/* ---- hero ---- */
.hero {
  padding: 92px 0 80px;
}

.overline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--fg-muted);
  margin-bottom: 26px;
}

.hero-title {
  font-size: clamp(2.4rem, 7vw, 5rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.08;
  margin-bottom: 30px;
}

.hero-title .line { display: block; }

.hero-sub {
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--fg-muted);
  max-width: 560px;
  margin-bottom: 28px;
}

.hero-note {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--fg-faint);
  line-height: 1.9;
}

/* ---- section head ---- */
.section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.section-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--fg-muted);
  white-space: nowrap;
}

.section-line {
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* ---- about ---- */
.about { padding: 72px 0; }

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text {
  font-size: 1.15rem;
  font-weight: 300;
  line-height: 1.9;
}

.about-text em { font-style: normal; color: var(--fg-muted); }

.about-list {
  list-style: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.about-list li { color: var(--fg); }
.about-list .mono { color: var(--fg-faint); }
.about-list .ans { color: var(--fg-muted); }

/* ---- projects ---- */
.projects { padding: 72px 0 96px; }

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

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--line);
  padding: 28px 26px;
  min-height: 200px;
  text-decoration: none;
  color: var(--fg);
  transition: transform 0.25s ease, border-color 0.25s ease,
    box-shadow 0.25s ease;
}

a.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 var(--fg);
}

.card--primary { border-color: var(--line-strong); }

.card-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--fg-faint);
  margin-bottom: 20px;
}

.card-title {
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.card-desc {
  font-size: 0.92rem;
  font-weight: 300;
  color: var(--fg-muted);
  flex: 1;
}

.card-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--fg-faint);
  margin-top: 20px;
}

.card-badge {
  position: absolute;
  top: 26px;
  right: 26px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  border: 1px solid var(--line);
  padding: 4px 8px;
  border-radius: 4px;
}

/* 四角线条 */
.card-corner {
  position: absolute;
  width: 9px;
  height: 9px;
  pointer-events: none;
}
.card-corner.tl { top: -1px; left: -1px; border-top: 2px solid var(--fg); border-left: 2px solid var(--fg); }
.card-corner.tr { top: -1px; right: -1px; border-top: 2px solid var(--fg); border-right: 2px solid var(--fg); }
.card-corner.bl { bottom: -1px; left: -1px; border-bottom: 2px solid var(--fg); border-left: 2px solid var(--fg); }
.card-corner.br { bottom: -1px; right: -1px; border-bottom: 2px solid var(--fg); border-right: 2px solid var(--fg); }

/* ---- footer ---- */
.site-footer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 26px 56px;
  border-top: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  color: var(--fg-muted);
}

.site-footer a { color: var(--fg-muted); text-decoration: none; }
.site-footer a:hover { color: var(--fg); text-decoration: underline; }
.foot-sep { color: var(--fg-faint); }

/* ---- 响应式 ---- */
@media (max-width: 860px) {
  .cards { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 640px) {
  .frame { inset: 8px; }
  .site-header, main, .site-footer { padding-left: 28px; padding-right: 28px; }
  .site-header { padding-top: 28px; }
  .hero { padding: 56px 0 56px; }
  .about, .projects { padding: 48px 0 56px; }
  .nav { gap: 16px; font-size: 0.76rem; }
  .theme-toggle { padding: 5px 10px; }
}

/* ---- 淡入动画 ---- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}