/* ============================================================
 * CCAS · 工程进度 — 深/浅 + 4 主色主题
 * ============================================================
 * 主题双轴：
 *   data-mode   = "dark" | "light"          深浅模式
 *   data-accent = "amber" | "teal" | "violet" | "rose"   主色
 * ============================================================ */

/* ====== 共享：主色定义（与 mode 无关） ====== */
[data-accent="amber"]  { --accent: #ffb84d; --accent-2: #ffa726; --accent-rgb: 255,184,77; }
[data-accent="teal"]   { --accent: #34d4be; --accent-2: #14b8a6; --accent-rgb: 52,212,190; }
[data-accent="violet"] { --accent: #a78bfa; --accent-2: #8b5cf6; --accent-rgb: 167,139,250; }
[data-accent="rose"]   { --accent: #fb7185; --accent-2: #e11d48; --accent-rgb: 251,113,133; }

[data-mode] {
  --accent-soft: rgba(var(--accent-rgb), 0.14);
  --accent-line: rgba(var(--accent-rgb), 0.36);
  --accent-glow: rgba(var(--accent-rgb), 0.55);
}

/* ====== 深色模式 ====== */
[data-mode="dark"] {
  --bg-0: #07090d;
  --bg-1: #0c1018;
  --bg-2: #11161f;
  --bg-3: #161c27;

  --fg-1: #e8edf5;
  --fg-2: #a8b3c7;
  --fg-3: #6d7891;
  --fg-4: #3f485a;

  --border-1: rgba(168, 179, 199, 0.08);
  --border-2: rgba(168, 179, 199, 0.16);
  --border-3: rgba(168, 179, 199, 0.28);

  --topbar-bg: rgba(7, 9, 13, 0.78);
  --grid-line: rgba(168, 179, 199, 0.06);
  --hero-grid-line: rgba(168, 179, 199, 0.06);
  --hero-title-grad: linear-gradient(180deg, #ffffff 0%, #c5cdde 100%);

  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.30);
  --shadow-glow: 0 0 18px var(--accent-glow);

  /* 状态色 */
  --danger: #ff7b6b;
  --danger-soft: rgba(255, 123, 107, 0.10);
  --danger-line: rgba(255, 123, 107, 0.32);
  --teal-fixed: #5eead4;
  --teal-soft-fixed: rgba(94, 234, 212, 0.08);
  --teal-line-fixed: rgba(94, 234, 212, 0.30);
}

/* ====== 浅色模式 ====== */
[data-mode="light"] {
  --bg-0: #fafbfc;
  --bg-1: #ffffff;
  --bg-2: #f5f7fa;
  --bg-3: #eaeef4;

  --fg-1: #0a2540;
  --fg-2: #425466;
  --fg-3: #8898aa;
  --fg-4: #c7cdd6;

  --border-1: rgba(10, 37, 64, 0.06);
  --border-2: rgba(10, 37, 64, 0.12);
  --border-3: rgba(10, 37, 64, 0.20);

  --topbar-bg: rgba(255, 255, 255, 0.82);
  --grid-line: rgba(10, 37, 64, 0.05);
  --hero-grid-line: rgba(10, 37, 64, 0.05);
  --hero-title-grad: linear-gradient(180deg, #0a2540 0%, #425466 100%);

  --shadow-card: 0 4px 16px rgba(10, 37, 64, 0.08);
  --shadow-glow: 0 0 18px var(--accent-glow);

  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.06);
  --danger-line: rgba(220, 38, 38, 0.28);
  --teal-fixed: #0d9488;
  --teal-soft-fixed: rgba(13, 148, 136, 0.06);
  --teal-line-fixed: rgba(13, 148, 136, 0.30);
}

/* ============================================================
 * 公共变量
 * ============================================================ */
:root {
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  --topbar-h: 60px;
  --side-w: 280px;
  --content-max: 880px;

  --ease-out: cubic-bezier(.22,.61,.36,1);
  --ease-in-out: cubic-bezier(.65,.05,.36,1);

  /* 主题切换的颜色过渡时长 */
  --theme-transition: background-color .3s ease, color .3s ease, border-color .3s ease;
}

* , *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--fg-1);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .3s ease, color .3s ease;
}

/* 全局浅网格背景（绝对定位，不滚动 → 不卡顿） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  opacity: .9;
}

/* 顶部光晕（绝对定位，不卡顿） */
body::after {
  content: "";
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 1100px;
  height: 500px;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(ellipse at center, rgba(var(--accent-rgb), .07), transparent 60%);
}

a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }

::selection { background: var(--accent-soft); color: var(--accent); }

/* ============================================================
 * 滚动条（全局）
 * ============================================================ */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--bg-3);
  border-radius: 6px;
  border: 2px solid var(--bg-0);
}
::-webkit-scrollbar-thumb:hover { background: var(--border-3); }

/* ============================================================
 * Hero 首屏
 * ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  isolation: isolate;
}

.hero.is-leaving {
  opacity: 0;
  transform: translateY(-40px);
  transition: opacity .9s var(--ease-in-out), transform .9s var(--ease-in-out);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid-line) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 80%);
  z-index: -2;
}

.hero-glow {
  position: absolute;
  width: 1200px;
  height: 1200px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(var(--accent-rgb),.18) 0%, rgba(var(--accent-rgb),.05) 30%, transparent 60%);
  z-index: -1;
  will-change: opacity;
  animation: hero-glow-pulse 6s ease-in-out infinite;
}

@keyframes hero-glow-pulse {
  0%, 100% { opacity: .85; }
  50%      { opacity: 1; }
}

.hero-inner {
  position: relative;
  max-width: 760px;
  padding: 0 32px;
  text-align: left;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--accent);
  margin: 0 0 28px;
  opacity: 0;
  transform: translateY(12px);
  animation: hero-rise .9s var(--ease-out) .1s forwards;
}

.hero-title {
  font-size: clamp(48px, 8vw, 92px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 32px;
  color: var(--fg-1);
}

.hero-title-line {
  display: block;
  opacity: 0;
  transform: translateY(24px);
  animation: hero-rise 1s var(--ease-out) forwards;
  background: var(--hero-title-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-title-line:nth-child(1) { animation-delay: .25s; }
.hero-title-line:nth-child(2) { animation-delay: .42s; }

.hero-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--fg-2);
  max-width: 64ch;
  margin: 0 0 48px;
  opacity: 0;
  transform: translateY(16px);
  animation: hero-rise 1s var(--ease-out) .65s forwards;
}

.hero-cue {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-3);
  letter-spacing: .12em;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0;
  animation: hero-rise 1s var(--ease-out) .85s forwards;
}

.hero-cue-arrow {
  display: inline-block;
  color: var(--accent);
  animation: cue-bounce 1.6s ease-in-out infinite;
}

@keyframes cue-bounce {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(6px); }
}

@keyframes hero-rise {
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
 * 顶栏
 * ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--topbar-h);
  background: var(--topbar-bg);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border-1);

  opacity: 0;
  transform: translateY(-100%);
  transition: opacity .6s var(--ease-out), transform .6s var(--ease-out), background-color .3s ease;
}

.topbar.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.topbar-inner {
  max-width: 1380px;
  margin: 0 auto;
  height: 100%;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.topbar-left { display: flex; align-items: center; gap: 14px; }

.topbar-mark {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
  transition: var(--theme-transition);
}

.topbar-title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--fg-2);
  text-transform: uppercase;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.topbar-current-label { color: var(--fg-3); letter-spacing: .2em; }
.topbar-current-date {
  color: var(--accent);
  letter-spacing: .08em;
  font-weight: 500;
  min-width: 86px;
  text-align: right;
  transition: color .3s ease;
}

.topbar-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2));
  box-shadow: 0 0 8px var(--accent-glow);
  transition: width .12s linear;
}

/* ============================================================
 * 主题切换器
 * ============================================================ */
.theme-switcher {
  position: relative;
}

.theme-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-2);
  background: var(--bg-1);
  border-radius: 8px;
  cursor: pointer;
  color: var(--fg-2);
  transition: border-color .2s, color .2s, background .2s;
}

.theme-trigger:hover {
  border-color: var(--accent-line);
  color: var(--accent);
}

.theme-trigger svg { width: 16px; height: 16px; }

.theme-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 240px;
  padding: 14px;
  background: var(--bg-1);
  border: 1px solid var(--border-2);
  border-radius: 10px;
  box-shadow: var(--shadow-card);
  z-index: 50;

  opacity: 0;
  transform: translateY(-6px) scale(.97);
  pointer-events: none;
  transform-origin: top right;
  transition: opacity .18s var(--ease-out), transform .18s var(--ease-out);
}

.theme-panel.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.theme-section + .theme-section { margin-top: 14px; }

.theme-section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--fg-3);
  margin-bottom: 8px;
  text-transform: uppercase;
}

/* 模式 segmented control */
.theme-mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  border-radius: 6px;
  padding: 3px;
  gap: 3px;
}

.theme-mode-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 10px;
  background: transparent;
  border: 0;
  border-radius: 4px;
  color: var(--fg-3);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  transition: background .2s, color .2s;
}

.theme-mode-btn[aria-pressed="true"] {
  background: var(--bg-1);
  color: var(--fg-1);
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
}

.theme-mode-btn svg { width: 13px; height: 13px; }

/* 主色色板 */
.theme-accent-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.theme-accent-btn {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 6px;
  border: 1.5px solid var(--border-2);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .2s, transform .15s;
}

.theme-accent-btn:hover { transform: translateY(-1px); }
.theme-accent-btn[aria-pressed="true"] {
  border-color: var(--fg-1);
}

.theme-accent-btn::before {
  content: "";
  width: 60%;
  height: 60%;
  border-radius: 4px;
  background: var(--swatch);
  box-shadow: 0 0 8px rgba(var(--swatch-rgb), .5);
}

.theme-accent-btn[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fg-1);
  bottom: 4px;
  right: 4px;
}

/* 各色块定义 */
.theme-accent-btn[data-accent="amber"]  { --swatch: #ffb84d; --swatch-rgb: 255,184,77; }
.theme-accent-btn[data-accent="teal"]   { --swatch: #34d4be; --swatch-rgb: 52,212,190; }
.theme-accent-btn[data-accent="violet"] { --swatch: #a78bfa; --swatch-rgb: 167,139,250; }
.theme-accent-btn[data-accent="rose"]   { --swatch: #fb7185; --swatch-rgb: 251,113,133; }

/* ============================================================
 * 主布局
 * ============================================================ */
.layout {
  max-width: 1380px;
  margin: 0 auto;
  padding: 56px 28px 120px;
  display: grid;
  grid-template-columns: var(--side-w) 1fr;
  gap: 56px;

  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s var(--ease-out) .1s, transform .9s var(--ease-out) .1s;
}

.layout.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
 * 左侧时间轴
 * ============================================================ */
.timeline {
  position: sticky;
  top: calc(var(--topbar-h) + 32px);
  align-self: start;
  max-height: calc(100vh - var(--topbar-h) - 64px);
  overflow-y: auto;
  padding: 8px 4px 8px 16px;

  /* 隐藏滚动条但保留滚动能力 */
  scrollbar-width: none;          /* Firefox */
  -ms-overflow-style: none;       /* IE / Edge legacy */
}
.timeline::-webkit-scrollbar { width: 0; height: 0; display: none; }

.tl-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tl-list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--accent-line) 0%,
    var(--border-2) 18%,
    var(--border-2) 82%,
    transparent 100%
  );
}

.tl-node {
  position: relative;
  padding: 10px 0 10px 36px;
  cursor: pointer;
  transition: padding-left .2s var(--ease-out);
}

.tl-node:hover { padding-left: 40px; }

.tl-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 1.5px solid var(--border-3);
  box-sizing: border-box;
  transition: background .25s, border-color .25s, box-shadow .25s;
}

.tl-node-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-3);
  letter-spacing: .04em;
  margin-bottom: 2px;
  transition: color .25s;
}

.tl-node-headline {
  display: -webkit-box;
  font-size: 13px;
  color: var(--fg-3);
  line-height: 1.5;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .25s;
}

.tl-node:hover .tl-node-date { color: var(--fg-2); }
.tl-node:hover .tl-node-headline { color: var(--fg-2); }

.tl-node.is-passed::before {
  background: var(--fg-4);
  border-color: var(--fg-4);
}

.tl-node.is-active::before {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow:
    0 0 0 4px rgba(var(--accent-rgb), 0.18),
    0 0 14px var(--accent-glow);
  animation: node-pulse 2.4s ease-in-out infinite;
}

.tl-node.is-active .tl-node-date {
  color: var(--accent);
  font-weight: 500;
}
.tl-node.is-active .tl-node-headline { color: var(--fg-1); }

@keyframes node-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(var(--accent-rgb),.18), 0 0 14px rgba(var(--accent-rgb),.55); }
  50%      { box-shadow: 0 0 0 6px rgba(var(--accent-rgb),.10), 0 0 20px rgba(var(--accent-rgb),.75); }
}

/* ============================================================
 * 右侧周列表
 * ============================================================ */
.weeks {
  max-width: var(--content-max);
  min-width: 0;
}

.week {
  padding: 88px 0 24px;
  position: relative;
  opacity: .35;
  transform: translateY(20px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}

.week:first-child { padding-top: 32px; }

.week:not(:first-child)::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 0;
  width: 64px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-line), transparent);
}

.week.is-revealed { opacity: 1; transform: translateY(0); }

/* ─── 周头部 ─── */
.week-head { margin-bottom: 40px; }

.week-head-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.week-date {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  letter-spacing: .06em;
  padding: 4px 12px;
  border: 1px solid var(--accent-line);
  border-radius: 4px;
  background: var(--accent-soft);
  transition: var(--theme-transition);
}

.week-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  padding: 3px 10px;
  border-radius: 99px;
}

.week-tag-current {
  background: var(--accent);
  color: var(--bg-0);
  font-weight: 600;
}

.week-headline {
  font-size: clamp(28px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.018em;
  color: var(--fg-1);
  margin: 0;
}

/* ─── 周内段落 ─── */
.week-section { margin-bottom: 36px; }
.week-section:last-child { margin-bottom: 0; }

.week-section-title {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-3);
  margin: 0 0 18px;
}

.week-section-title .rule {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  border-radius: 1px;
  flex-shrink: 0;
}

/* ─── 进展列表 ─── */
.progress-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.progress-list li {
  position: relative;
  padding: 10px 16px 10px 28px;
  background: var(--bg-1);
  border: 1px solid var(--border-1);
  border-radius: 6px;
  color: var(--fg-2);
  line-height: 1.75;
  transition: border-color .2s, background .2s;
}

.progress-list li:hover {
  border-color: var(--border-2);
  background: var(--bg-2);
}

.progress-list li::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 18px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  opacity: .8;
}

.progress-list ul {
  margin-top: 8px;
  padding-left: 12px;
  border-left: 1px solid var(--border-1);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.progress-list ul li {
  background: transparent;
  border: 0;
  padding: 4px 0 4px 18px;
}
.progress-list ul li::before {
  width: 4px;
  height: 4px;
  top: 16px;
  left: 4px;
  background: var(--fg-4);
}
.progress-list ul li:hover { background: transparent; }

/* 关键词高亮 */
.hl {
  color: var(--fg-1);
  font-weight: 600;
  position: relative;
  padding: 0 2px;
}
.hl::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 6px;
  background: var(--accent-soft);
  z-index: -1;
  transition: background .3s ease;
}

.kbd {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-3);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-2);
}

.ext-link {
  color: var(--accent);
  border-bottom: 1px solid rgba(var(--accent-rgb), .35);
  transition: border-color .2s, color .2s;
}
.ext-link:hover {
  color: var(--accent-2);
  border-bottom-color: var(--accent);
}

/* ─── 参考文档 chip ─── */
.ref-list {
  margin-top: 18px;
  padding: 16px 18px;
  background: var(--bg-1);
  border: 1px dashed var(--border-2);
  border-radius: 8px;
}

.ref-list-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--fg-3);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.ref-list-items { display: flex; flex-wrap: wrap; gap: 8px; }

.ref-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  padding: 6px 12px;
  border: 1px solid var(--border-2);
  border-radius: 4px;
  color: var(--fg-2);
  background: var(--bg-2);
  transition: border-color .2s, color .2s, background .2s;
}

.ref-chip::before {
  content: "↗";
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  transition: color .2s, transform .2s;
}

.ref-chip:hover {
  border-color: var(--accent-line);
  color: var(--accent);
  background: var(--accent-soft);
}

.ref-chip:hover::before {
  color: var(--accent);
  transform: translate(2px, -2px);
}

/* ─── 问题 / 对策 双列 ─── */
.qa-pair {
  display: grid;
  grid-template-columns: 1fr 36px 1fr;
  align-items: stretch;
  margin-bottom: 18px;
}

.qa-pair:last-child { margin-bottom: 0; }

.qa-card {
  padding: 20px 22px;
  border-radius: 8px;
  position: relative;
  transition: border-color .25s, box-shadow .25s, background .3s;
}

.qa-problem {
  background: linear-gradient(180deg, var(--danger-soft), transparent);
  border: 1px solid var(--danger-line);
}

.qa-action {
  background: linear-gradient(180deg, var(--teal-soft-fixed), transparent);
  border: 1px solid var(--teal-line-fixed);
}

.qa-card:hover { box-shadow: var(--shadow-card); }
.qa-problem:hover { border-color: var(--danger); }
.qa-action:hover  { border-color: var(--teal-fixed); }

.qa-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.qa-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.qa-problem .qa-icon {
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid var(--danger-line);
}

.qa-action .qa-icon {
  background: var(--teal-soft-fixed);
  color: var(--teal-fixed);
  border: 1px solid var(--teal-line-fixed);
  font-size: 13px;
  font-family: var(--font-sans);
  line-height: 1;
}

.qa-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.qa-problem .qa-label { color: var(--danger); }
.qa-action  .qa-label { color: var(--teal-fixed); }

.qa-no {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-4);
  letter-spacing: .1em;
}

.qa-title {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--fg-1);
  line-height: 1.55;
  margin: 0 0 10px;
}

.qa-body {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fg-2);
  margin: 0;
}

.qa-body + .qa-list { margin-top: 10px; }

.qa-empty { color: var(--fg-3); font-style: italic; }

.qa-list { display: flex; flex-direction: column; gap: 6px; }

.qa-list li {
  position: relative;
  padding: 4px 0 4px 18px;
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.7;
}

.qa-problem .qa-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  top: 4px;
  color: var(--danger);
  font-family: var(--font-mono);
}

.qa-action .qa-list li::before {
  content: "›";
  position: absolute;
  left: 4px;
  top: 4px;
  color: var(--teal-fixed);
  font-family: var(--font-mono);
  font-weight: 700;
}

.qa-arrow {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qa-arrow::before {
  content: "";
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--danger-line), var(--teal-line-fixed));
}

.qa-arrow::after {
  content: "";
  position: absolute;
  right: 2px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--teal-fixed);
  border-top: 1.5px solid var(--teal-fixed);
}

.qa-empty-banner {
  padding: 28px 24px;
  background: var(--bg-1);
  border: 1px dashed var(--border-2);
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
  color: var(--fg-3);
  font-family: var(--font-mono);
  letter-spacing: .12em;
}

/* ─── 下周计划 ─── */
.plan-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.plan-list li {
  position: relative;
  padding: 8px 16px 8px 32px;
  font-size: 14.5px;
  color: var(--fg-2);
  line-height: 1.75;
  border-radius: 4px;
  transition: background .2s, color .2s;
}

.plan-list li::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 14px;
  width: 11px;
  height: 11px;
  border: 1.5px solid var(--border-3);
  border-radius: 2px;
  background: transparent;
  transition: border-color .2s, background .2s;
}

.plan-list li:hover {
  background: var(--bg-1);
  color: var(--fg-1);
}

.plan-list li:hover::before {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ─── 页脚 ─── */
.weeks-footer {
  margin-top: 80px;
  padding-top: 40px;
  text-align: center;
}

.weeks-footer-rule {
  width: 60px;
  height: 1px;
  background: var(--border-2);
  margin: 0 auto 16px;
}

.weeks-footer-text {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: .18em;
  margin: 0;
}

/* ============================================================
 * 响应式
 * ============================================================ */
@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .timeline { display: none; }
  .qa-pair { grid-template-columns: 1fr; gap: 12px; }
  .qa-arrow { display: none; }
  .theme-panel { width: 220px; }
}

@media (max-width: 640px) {
  .layout { padding: 32px 18px 80px; }
  .week { padding-top: 56px; }
  .hero-inner { padding: 0 24px; }
  .week-headline { font-size: 26px; }
  .topbar-current-label { display: none; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  .week { opacity: 1; transform: none; }
}