@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;600&family=Noto+Serif+SC:wght@600;700&display=swap');

:root {
  color-scheme: light dark;
  --bg: #f4f4f2;
  --fg: #101010;
  --muted: #5f5f5f;
  --panel: #ffffff;
  --border: #dddddd;
  --shadow: rgba(0, 0, 0, 0.08);
  --accent: #111111;
}

[data-theme="dark"] {
  --bg: #0c0c0c;
  --fg: #f1f1f1;
  --muted: #a2a2a2;
  --panel: #141414;
  --border: #2a2a2a;
  --shadow: rgba(0, 0, 0, 0.4);
  --accent: #f1f1f1;
}

html {
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  transition: background 0.4s ease, color 0.4s ease;
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

body::-webkit-scrollbar {
  width: 0;
  height: 0;
}

[data-theme="dark"] body {
  background: var(--bg);
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(48px + env(safe-area-inset-top)) 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

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

.calendar-badge {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  display: grid;
  grid-template-rows: 1fr 2fr;
  align-items: center;
  justify-items: center;
  overflow: hidden;
  box-shadow: 0 8px 16px var(--shadow);
  -webkit-tap-highlight-color: transparent;
}

.calendar-month {
  width: 100%;
  text-align: center;
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #ffffff;
  background: #111111;
  padding: 2px 0 1px;
}

[data-theme="dark"] .calendar-month {
  background: #f1f1f1;
  color: #101010;
}

.calendar-day {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fg);
  line-height: 1;
}

.title {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 24px;
}

h1 {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  margin: 0;
  letter-spacing: 0.04em;
}

.subtitle {
  font-size: 1rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.1;
}

.header-countdown {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.toggle {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: transform 0.2s ease, border 0.2s ease, background 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.toggle:hover {
  transform: translateY(-2px);
}

.toggle:active {
  transform: translateY(-3px) scale(1.01);
}

.toggle.is-pressed {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 10px 18px rgba(0, 0, 0, 0.18);
}

.toggle .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
}

.pager {
  display: none;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 0 4px;
  margin-top: -10px;
  position: relative;
  z-index: 3;
}

.pager button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: transform 0.2s ease, border 0.2s ease, background 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.pager button:hover {
  transform: translateY(-2px);
}

.pager button.is-pressed {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.18);
}


.panel {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 20px 40px var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  overflow: hidden;
}

.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 24px;
  border: 1px solid transparent;
  pointer-events: none;
}

.panel-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.panel-title h2 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: 0.08em;
  line-height: 1.1;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.panel-title .range {
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.lead {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-family: "Noto Serif SC", serif;
}

.lead-number {
  font-size: clamp(2.6rem, 5vw, 3.8rem);
  font-weight: 700;
}

.lead-label {
  font-size: 1rem;
  color: var(--muted);
}

.subjects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 16px;
}

.subject {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.03), transparent 70%);
  opacity: 0;
  transform: translateY(12px);
  animation: rise 0.6s ease forwards;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, opacity 0.25s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

[data-theme="dark"] .subject {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 70%);
}

.subject h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  min-height: 1.8em;
  text-align: left;
}

.subject:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 10px 18px rgba(0, 0, 0, 0.12);
}

.subject.is-pressed {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 16px 26px rgba(0, 0, 0, 0.2);
}

.subject h3 .label {
  display: inline-block;
  min-width: 6ch;
}

.subject .date {
  font-size: 0.85rem;
  color: var(--muted);
}

.subject .count {
  font-size: 1.4rem;
  font-weight: 600;
}

.subject .state {
  font-size: 0.75rem;
  color: var(--muted);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  header {
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .hero {
    position: relative;
    perspective: 1200px;
  }

  .panel {
    position: absolute;
    width: 100%;
    left: 0;
    top: 0;
    opacity: 0;
    transform: rotateY(0deg);
    transition: transform 0.38s ease, opacity 0.38s ease;
    transform-style: preserve-3d;
    backface-visibility: hidden;
  }

  .panel.is-visible {
    opacity: 1;
    transform: rotateY(0deg);
    pointer-events: auto;
    z-index: 2;
  }

  .panel.is-hidden {
    pointer-events: none;
    z-index: 1;
  }

  .panel.flip-in-right {
    transform-origin: right center;
    transform: rotateY(90deg);
    opacity: 0;
  }

  .panel.flip-in-left {
    transform-origin: left center;
    transform: rotateY(-90deg);
    opacity: 0;
  }

  .panel.flip-out-left {
    transform-origin: left center;
    transform: rotateY(-90deg);
    opacity: 0;
  }

  .panel.flip-out-right {
    transform-origin: right center;
    transform: rotateY(90deg);
    opacity: 0;
  }

  .page {
    padding: calc(32px + env(safe-area-inset-top)) 18px 48px;
    gap: 24px;
  }

  header {
    align-items: center;
    justify-content: space-between;
  }

  .subtitle {
    letter-spacing: 0.18em;
  }

  .panel {
    padding: 20px;
    border-radius: 20px;
  }

  .panel-title {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .lead {
    gap: 10px;
  }

  .lead-number {
    font-size: 2.2rem;
  }

  .subjects {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .subject {
    padding: 14px;
    gap: 6px;
  }

  .subject h3 {
    font-size: 0.95rem;
    letter-spacing: 0.06em;
  }

  .subject .count {
    font-size: 1.2rem;
  }

  .pager {
    display: flex;
  }

  .title {
    padding-left: 20px;
  }

  .header-countdown {
    font-size: 0.72rem;
  }
}

.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--muted);
  padding: 6px 0 0;
}

.footer .github,
.footer .vercel {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer .github:hover,
.footer .vercel:hover {
  color: var(--fg);
  transform: translateY(-1px);
}

.footer-sep {
  color: var(--muted);
}