/* ============================================
   AI Timeline - Minimal Signal Design
   ============================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600;700&family=Sora:wght@500;600;700;800&display=swap');

/* --- Theme --- */
:root {
  --bg-primary: #f6f7f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eef0ec;
  --bg-glass: rgba(255, 255, 255, 0.9);
  --bg-glass-border: rgba(20, 20, 18, 0.08);
  --text-primary: #1e221d;
  --text-secondary: #4f554d;
  --text-muted: #777d74;
  --text-faint: #b8beb4;
  --border-color: rgba(20, 20, 18, 0.1);
  --border-strong: rgba(20, 20, 18, 0.18);
  --card-shadow: 0 1px 2px rgba(15, 20, 15, 0.04), 0 10px 28px rgba(15, 20, 15, 0.06);
  --card-shadow-hover: 0 2px 8px rgba(15, 20, 15, 0.08), 0 18px 36px rgba(15, 20, 15, 0.1);
  --overlay-bg: rgba(12, 14, 12, 0.54);
  --code-bg: #edf0ea;

  --accent: #10a37f;
  --accent-soft: rgba(16, 163, 127, 0.12);
  --timeline-line: #6f7d74;
  --timeline-line-glow: rgba(16, 163, 127, 0.3);

  --cat-model-release: #10a37f;
  --cat-architecture: #2f8dd8;
  --cat-product-launch: #f39b2f;
  --cat-research: #1479c9;
  --cat-open-source: #7d65d8;
  --cat-regulation: #e05858;
  --cat-milestone: #cc6a2a;
  --cat-tool: #14838b;

  --card-radius: 14px;
  --transition: 0.24s ease;
  --font-display: 'Sora', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --timeline-height: 6px;
  --node-size: 12px;
  --card-width: 316px;
}

[data-theme="dark"] {
  --bg-primary: #111311;
  --bg-secondary: #161a16;
  --bg-tertiary: #1d221d;
  --bg-glass: rgba(22, 26, 22, 0.88);
  --bg-glass-border: rgba(236, 241, 235, 0.08);
  --text-primary: #edf1ea;
  --text-secondary: #b7bdb4;
  --text-muted: #90988d;
  --text-faint: #535d53;
  --border-color: rgba(236, 241, 235, 0.1);
  --border-strong: rgba(236, 241, 235, 0.2);
  --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 28px rgba(0, 0, 0, 0.35);
  --card-shadow-hover: 0 2px 10px rgba(0, 0, 0, 0.4), 0 16px 36px rgba(0, 0, 0, 0.5);
  --overlay-bg: rgba(2, 5, 3, 0.76);
  --code-bg: #20251f;
  --timeline-line: #8a978e;
  --timeline-line-glow: rgba(36, 185, 146, 0.36);
  --accent-soft: rgba(25, 199, 154, 0.2);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  flex: 1 0 auto;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #0b8e6f;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 1000;
  background: var(--accent);
  color: #fff;
  padding: 0.45rem 0.9rem;
  border-radius: 0 0 10px 0;
  font-size: 0.85rem;
}

.skip-link:focus {
  top: 0;
}

/* --- Top Controls --- */
.top-controls {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 120;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

/* --- Theme Toggle --- */
.theme-toggle {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--bg-glass-border);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(8, 10, 8, 0.08);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(8, 10, 8, 0.14);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: opacity 0.25s, transform 0.25s;
  font-size: 1rem;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-75deg) scale(0.8);
}

.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(75deg) scale(0.8);
}

.theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* --- Hero --- */
.hero {
  padding: 2.25rem 1.1rem 0.95rem;
  border-bottom: 1px solid var(--border-color);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.92rem, 4vw, 2.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.hero p {
  max-width: 680px;
  color: var(--text-secondary);
  font-size: clamp(0.92rem, 1.25vw, 1.01rem);
  margin-bottom: 0;
}

/* --- Filter Bar --- */
.filter-bar {
  position: fixed;
  top: 0.8rem;
  left: 0;
  right: 0;
  z-index: 115;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}

.filter-bar.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.filter-bar-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
}

.filter-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.filter-toggle-btn svg {
  width: 16px;
  height: 16px;
}

.filter-toggle-btn path,
.filter-toggle-btn circle,
.filter-toggle-btn line {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.github-link-icon path {
  fill: currentColor;
  stroke: none;
}

.filter-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-toggle-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.filter-toggle-top {
  width: 42px;
  height: 42px;
  border-color: rgba(245, 248, 244, 0.15);
  background: #121715;
  color: #f0f4ef;
  box-shadow: 0 8px 24px rgba(8, 10, 8, 0.18);
}

.filter-toggle-top:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: #0f1311;
}

.filter-panel {
  display: none;
  width: 100%;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  padding: 0.58rem 0.72rem;
  border: 1px solid var(--bg-glass-border);
  border-radius: 14px;
  background: var(--bg-glass);
  box-shadow: 0 18px 34px rgba(8, 10, 8, 0.18);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.filter-panel.open {
  display: flex;
}

.search-wrapper {
  width: 300px;
  max-width: 100%;
  position: relative;
  flex-shrink: 0;
}

.search-icon {
  position: absolute;
  left: 0.78rem;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.84rem;
  padding: 0.54rem 0.8rem 0.54rem 2.2rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.filter-chips {
  display: flex;
  gap: 0.4rem;
  flex: 1;
  flex-wrap: wrap;
}

.filter-chip {
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.34rem 0.7rem;
  font-family: var(--font-body);
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.filter-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.filter-chip.active {
  color: #ffffff;
  border-color: var(--text-primary);
  background: var(--text-primary);
}

.filter-chip.active[data-category="model-release"] { background: var(--cat-model-release); border-color: var(--cat-model-release); }
.filter-chip.active[data-category="architecture"] { background: var(--cat-architecture); border-color: var(--cat-architecture); }
.filter-chip.active[data-category="product-launch"] { background: var(--cat-product-launch); border-color: var(--cat-product-launch); }
.filter-chip.active[data-category="research"] { background: var(--cat-research); border-color: var(--cat-research); }
.filter-chip.active[data-category="open-source"] { background: var(--cat-open-source); border-color: var(--cat-open-source); }
.filter-chip.active[data-category="regulation"] { background: var(--cat-regulation); border-color: var(--cat-regulation); }
.filter-chip.active[data-category="milestone"] { background: var(--cat-milestone); border-color: var(--cat-milestone); }
.filter-chip.active[data-category="tool"] { background: var(--cat-tool); border-color: var(--cat-tool); }

/* --- Timeline Layout --- */
.timeline-section {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 1.35rem 0 1.25rem;
}

.timeline-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  padding: 0 1rem;
  margin-bottom: 0.75rem;
}

.timeline-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.3rem 0.62rem;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.timeline-nav-btn svg {
  width: 15px;
  height: 15px;
}

.timeline-nav-btn path {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.timeline-nav-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.timeline-nav-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.timeline-position {
  flex: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.timeline-scroll-container {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: none;
  scrollbar-width: none;
  min-height: 500px;
  padding-top: 0.8rem;
  padding-bottom: 2rem;
  cursor: grab;
}

.timeline-scroll-container.is-dragging,
.timeline-scroll-container.is-dragging * {
  user-select: none;
}

.timeline-scroll-container::-webkit-scrollbar {
  height: 0;
}

.timeline-scroll-container:active {
  cursor: grabbing;
}

.timeline-scroll-container:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 12px;
}

.timeline {
  --timeline-card-width: var(--card-width);
  --timeline-gap-current: 0.9rem;
  --timeline-month-min-width: 36px;
  width: max-content;
  min-width: 100%;
  min-height: 430px;
  display: flex;
  align-items: flex-start;
  gap: var(--timeline-gap-current);
  padding: 0 1.25rem 1.8rem;
  position: relative;
}

.timeline.timeline-density-roomy {
  --timeline-card-width: clamp(292px, 30vw, 332px);
  --timeline-gap-current: 0.96rem;
  --timeline-month-min-width: 40px;
}

.timeline.timeline-density-balanced {
  --timeline-card-width: clamp(276px, 28vw, 308px);
  --timeline-gap-current: 0.74rem;
  --timeline-month-min-width: 34px;
}

.timeline.timeline-density-compact {
  --timeline-card-width: clamp(244px, 24vw, 286px);
  --timeline-gap-current: 0.56rem;
  --timeline-month-min-width: 30px;
}

.timeline-beam {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(2.05rem - (var(--timeline-height) / 2));
  height: var(--timeline-height);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22) 0%, rgba(255, 255, 255, 0) 35%),
    var(--timeline-line);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.3),
    0 0 0 1px rgba(0, 0, 0, 0.08),
    0 0 20px var(--timeline-line-glow);
  border-radius: 999px;
  z-index: 2;
  pointer-events: none;
}

.timeline-year-marker {
  position: relative;
  min-width: 90px;
  padding-top: 1.05rem;
  flex-shrink: 0;
  text-align: center;
  z-index: 3;
}

.timeline-year-marker span {
  display: inline-flex;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.03em;
}

.timeline-month-marker {
  position: relative;
  min-width: var(--timeline-month-min-width);
  height: 3.05rem;
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  z-index: 5;
}

.timeline-month-marker span {
  position: absolute;
  top: calc(2.05rem - 0.42rem);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.28rem;
  height: 1rem;
  padding: 0 0.16rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.02em;
  line-height: 1;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.timeline-date-marker {
  display: none !important;
}

.timeline-event {
  width: var(--timeline-card-width);
  min-width: var(--timeline-card-width);
  flex-shrink: 0;
  padding-top: 3.05rem;
  position: relative;
  z-index: 3;
  opacity: 1;
  transform: none;
  transition: none;
}

.timeline-event.visible {
  opacity: 1;
  transform: none;
}

.timeline-event.above,
.timeline-event.below {
  padding-top: 3.05rem;
}

.timeline-event-stack {
  display: flex;
  flex-direction: column;
  gap: 0.62rem;
}

.timeline-event-item {
  width: 100%;
}

.timeline-node {
  position: absolute;
  top: calc(2.05rem - (var(--node-size) / 2));
  left: 50%;
  width: var(--node-size);
  height: var(--node-size);
  border-radius: 50%;
  transform: translateX(-50%);
  border: 2px solid var(--bg-primary);
  z-index: 6;
}

.timeline-node[data-category="model-release"] { background: var(--cat-model-release); }
.timeline-node[data-category="architecture"] { background: var(--cat-architecture); }
.timeline-node[data-category="product-launch"] { background: var(--cat-product-launch); }
.timeline-node[data-category="research"] { background: var(--cat-research); }
.timeline-node[data-category="open-source"] { background: var(--cat-open-source); }
.timeline-node[data-category="regulation"] { background: var(--cat-regulation); }
.timeline-node[data-category="milestone"] { background: var(--cat-milestone); }
.timeline-node[data-category="tool"] { background: var(--cat-tool); }

.timeline-connector {
  position: absolute;
  top: calc(2.05rem + (var(--timeline-height) / 2) - 1px);
  left: 50%;
  width: 2px;
  height: 24px;
  transform: translateX(-50%);
  background: var(--border-strong);
  z-index: 2;
}

.event-card {
  min-height: 220px;
  border-radius: var(--card-radius);
  border: 1px solid var(--bg-glass-border);
  background: var(--bg-secondary);
  box-shadow: var(--card-shadow);
  padding: 1.05rem 1.05rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  position: relative;
  cursor: pointer;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.timeline-event-group .event-card {
  border-style: dashed;
}

.event-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 12px 0 0 12px;
}

.event-card[data-category="model-release"]::before { background: var(--cat-model-release); }
.event-card[data-category="architecture"]::before { background: var(--cat-architecture); }
.event-card[data-category="product-launch"]::before { background: var(--cat-product-launch); }
.event-card[data-category="research"]::before { background: var(--cat-research); }
.event-card[data-category="open-source"]::before { background: var(--cat-open-source); }
.event-card[data-category="regulation"]::before { background: var(--cat-regulation); }
.event-card[data-category="milestone"]::before { background: var(--cat-milestone); }
.event-card[data-category="tool"]::before { background: var(--cat-tool); }

.event-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--border-strong);
}

.event-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.event-date {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.event-meta-row {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.55rem;
}

.event-category-badge {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  padding: 0.16rem 0.52rem;
  font-size: 0.61rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.event-category-badge[data-category="model-release"] { background: rgba(16, 163, 127, 0.14); color: var(--cat-model-release); }
.event-category-badge[data-category="architecture"] { background: rgba(47, 141, 216, 0.14); color: var(--cat-architecture); }
.event-category-badge[data-category="product-launch"] { background: rgba(243, 155, 47, 0.14); color: var(--cat-product-launch); }
.event-category-badge[data-category="research"] { background: rgba(20, 121, 201, 0.14); color: var(--cat-research); }
.event-category-badge[data-category="open-source"] { background: rgba(125, 101, 216, 0.14); color: var(--cat-open-source); }
.event-category-badge[data-category="regulation"] { background: rgba(224, 88, 88, 0.14); color: var(--cat-regulation); }
.event-category-badge[data-category="milestone"] { background: rgba(204, 106, 42, 0.14); color: var(--cat-milestone); }
.event-category-badge[data-category="tool"] { background: rgba(20, 131, 139, 0.14); color: var(--cat-tool); }

.event-title {
  font-family: var(--font-display);
  font-size: 0.96rem;
  line-height: 1.32;
  letter-spacing: -0.01em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.53em;
}

.event-short {
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 3.48em;
}

.event-tags {
  margin-top: auto;
  padding-top: 0.55rem;
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.event-tag {
  border-radius: 999px;
  background: var(--code-bg);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  padding: 0.16rem 0.42rem;
}

/* --- Detail Panel --- */
.detail-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.detail-overlay.open {
  opacity: 1;
  visibility: visible;
}

.detail-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 640px;
  height: 100%;
  z-index: 201;
  transform: translateX(100%);
  transition: transform 0.34s ease;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  box-shadow: -18px 0 40px rgba(8, 12, 8, 0.18);
  overflow-y: auto;
}

.detail-panel.open {
  transform: translateX(0);
}

.detail-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.1rem;
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.detail-header-meta {
  flex: 1;
  min-width: 0;
  margin-right: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.detail-header-meta .event-date {
  font-size: 0.71rem;
  white-space: nowrap;
}

.detail-header-meta .event-category-badge {
  white-space: nowrap;
  font-size: 0.57rem;
  padding: 0.14rem 0.48rem;
}

.detail-close {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.detail-close:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.detail-close:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.detail-body {
  padding: 1.35rem 1.2rem 2rem;
}

.detail-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.detail-title {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.6vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.detail-short {
  color: var(--text-secondary);
  border-left: 3px solid var(--border-color);
  padding-left: 0.82rem;
  margin-bottom: 1.15rem;
}

.detail-links {
  display: flex;
  gap: 0.44rem;
  flex-wrap: wrap;
  margin-bottom: 1.3rem;
}

.detail-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  padding: 0.34rem 0.72rem;
  color: var(--text-secondary);
  font-size: 0.74rem;
}

.detail-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.detail-copy-link {
  margin-left: auto;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.detail-header-meta .detail-copy-link {
  width: 28px;
  height: 28px;
}

.detail-copy-link svg {
  width: 14px;
  height: 14px;
}

.detail-copy-link path {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.detail-copy-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.detail-copy-link.copied {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.detail-copy-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.detail-content {
  line-height: 1.75;
}

.detail-content h2,
.detail-content h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.detail-content h2 {
  margin: 2rem 0 0.6rem;
  font-size: 1.22rem;
}

.detail-content h3 {
  margin: 1.2rem 0 0.45rem;
  font-size: 1rem;
}

.detail-content p,
.detail-content ul,
.detail-content ol {
  margin-bottom: 0.9rem;
}

.detail-content ul,
.detail-content ol {
  padding-left: 1.3rem;
}

.detail-content code {
  font-family: var(--font-mono);
  font-size: 0.83em;
  background: var(--code-bg);
  padding: 0.12rem 0.38rem;
  border-radius: 5px;
}

.detail-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 0.8rem;
  color: var(--text-secondary);
}

/* --- Loading / Empty --- */
.detail-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  color: var(--text-muted);
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin-right: 0.6rem;
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.no-results {
  min-height: 220px;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  padding: 2rem 1rem;
}

.no-results-icon {
  font-size: 2rem;
  margin-bottom: 0.65rem;
  opacity: 0.6;
}

.no-results h3 {
  font-family: var(--font-display);
  margin-bottom: 0.3rem;
}

/* --- Footer --- */
.site-footer {
  margin-top: 1rem;
  border-top: 1px solid var(--border-color);
  padding: 2.2rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.site-footer a {
  font-weight: 600;
}

.footer-seo-note {
  max-width: 760px;
  margin: 0.72rem auto 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  margin-top: 0.6rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --- Event Pages --- */
body.event-page {
  background: var(--bg-primary);
}

.event-hero .hero-content {
  max-width: 860px;
}

.event-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.65rem;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--text-muted);
}

.event-back-link:hover {
  color: var(--accent);
}

.event-page-meta {
  margin-top: 0.65rem;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.74rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.event-page-meta span {
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.14rem 0.45rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.event-main {
  width: min(860px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 2.6rem;
}

.event-article {
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  border-radius: 14px;
  padding: 1.1rem 1.2rem 1.35rem;
  box-shadow: var(--card-shadow);
}

.event-article h2,
.event-article h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.event-article h2 {
  margin: 1.25rem 0 0.52rem;
  font-size: 1.05rem;
}

.event-article h3 {
  margin: 1rem 0 0.46rem;
  font-size: 0.95rem;
}

.event-article p,
.event-article ul {
  margin-bottom: 0.88rem;
  color: var(--text-secondary);
}

.event-article ul {
  padding-left: 1.2rem;
}

.event-article code {
  font-family: var(--font-mono);
  background: var(--code-bg);
  padding: 0.08rem 0.36rem;
  border-radius: 5px;
  font-size: 0.83em;
}

.event-source-links {
  margin-top: 1.25rem;
  padding-top: 0.88rem;
  border-top: 1px solid var(--border-color);
}

.event-source-links h2 {
  margin-top: 0;
}

.event-source-links ul {
  margin: 0;
}

/* --- General Scrollbar --- */
::-webkit-scrollbar {
  width: 7px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-faint);
  border-radius: 4px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero {
    padding-top: 2rem;
  }

  :root {
    --card-width: 292px;
  }
}

@media (max-width: 820px) {
  .top-controls {
    top: 0.72rem;
    right: 0.72rem;
  }

  .hero {
    padding: 1.85rem 0.9rem 0.8rem;
  }

  .filter-bar {
    top: 0.62rem;
  }

  .filter-bar-inner { padding: 0 0.9rem; }
  .filter-panel { flex-direction: column; align-items: stretch; }
  .search-wrapper { width: 100%; }
  .filter-chips { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; }

  .timeline-toolbar {
    display: none;
  }

  .timeline-scroll-container {
    overflow-x: visible;
    scroll-snap-type: none;
    min-height: auto;
    padding-top: 0.35rem;
    padding-bottom: 0;
  }

  .timeline {
    width: 100%;
    min-width: 0;
    min-height: auto;
    display: block;
    padding: 0;
  }

  .timeline-beam {
    left: 18px;
    right: auto;
    top: 0;
    bottom: 0;
    width: 2px;
    height: auto;
  }

  .timeline-year-marker {
    min-width: 0;
    text-align: left;
    padding-top: 0;
    padding-left: 42px;
    margin: 1rem 0 0.35rem;
  }

  .timeline-month-marker {
    min-width: 0;
    height: auto;
    padding-left: 42px;
    margin: 0.16rem 0 0.12rem;
    display: block;
  }

  .timeline-month-marker span {
    position: static;
    width: auto;
    height: 1rem;
    min-width: 1.28rem;
    padding: 0 0.16rem;
    border-radius: 999px;
    border: 1px solid var(--border-strong);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.56rem;
    box-shadow: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .timeline-event,
  .timeline-event.above,
  .timeline-event.below {
    width: 100%;
    min-width: 0;
    padding-top: 0;
    padding-left: 42px;
    margin-bottom: 0.55rem;
    scroll-snap-align: none;
  }

  .timeline-event-stack {
    gap: 0.5rem;
  }

  .timeline-event-group .timeline-node {
    top: 16px;
  }

  .timeline-node {
    top: 50%;
    left: 18px;
    transform: translate(-50%, -50%);
  }

  .timeline-connector {
    display: none;
  }

  .event-card {
    min-height: 0;
  }

  .event-title,
  .event-short {
    min-height: 0;
  }

  .event-tags {
    margin-top: 0.45rem;
    padding-top: 0;
  }

  .detail-panel {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.58rem;
  }

  .hero p {
    font-size: 0.86rem;
  }

  .site-footer {
    font-size: 0.8rem;
  }
}

/* --- Print --- */
@media print {
  .top-controls,
  .filter-bar,
  .timeline-toolbar,
  .detail-overlay,
  .detail-panel {
    display: none !important;
  }

  .timeline-event {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* --- Noscript --- */
.noscript-events {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.noscript-events h2 {
  font-family: var(--font-display);
  margin-bottom: 0.8rem;
}

.noscript-events ul {
  list-style: none;
}

.noscript-events li {
  border-bottom: 1px solid var(--border-color);
  padding: 0.7rem 0;
}

.noscript-events .noscript-date {
  display: inline-block;
  width: 105px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}