/* 同舟 · AI 协作 — 项目案例页 */
/* 暖纸 #f4f2e9 / 森林绿 #234a3c / 赭红 #b9603d */

@font-face {
  font-family: "Instrument Serif";
  src: url("../../assets/fonts/InstrumentSerif-Regular.woff2") format("woff2"), url("../../assets/fonts/InstrumentSerif-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("../../assets/fonts/InstrumentSans-Regular.woff2") format("woff2"), url("../../assets/fonts/InstrumentSans-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #f4f2e9;
  --forest: #234a3c;
  --ochre: #a8542f;
  --ink: #234a3c;
  --ink-soft: rgba(35, 74, 60, 0.78);
  --line: rgba(35, 74, 60, 0.28);
  --card: rgba(255, 255, 255, 0.42);
  --serif: "Instrument Serif", "Songti SC", "Noto Serif CJK SC", serif;
  --sans: "Instrument Sans", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
}

html[data-theme="dark"] {
  --paper: #1d2b25;
  --forest: #e8e4d6;
  --ochre: #d08a6b;
  --ink: #e8e4d6;
  --ink-soft: rgba(232, 228, 214, 0.78);
  --line: rgba(232, 228, 214, 0.3);
  --card: rgba(244, 242, 233, 0.06);
}

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

html {
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}

/* 跳过链接 */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--forest);
  color: var(--paper);
  text-decoration: none;
  border-radius: 2px;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 1rem;
}

/* 焦点可见 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 3px;
  border-radius: 2px;
}

/* 头部导航 */
.site-header {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 0;
}

.nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.92rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.nav a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.nav a:hover {
  border-bottom-color: var(--ochre);
  color: var(--ochre);
}

.nav-sep {
  color: var(--ink-soft);
}

.nav-current {
  color: var(--ink-soft);
}

.theme-toggle {
  margin-left: auto;
  font-family: var(--sans);
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--ochre);
  color: var(--ochre);
}

/* 主体布局 */
main {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 首屏 */
.hero {
  padding: 4.5rem 0 3.5rem;
  max-width: 46rem;
}

.kicker {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ochre);
  margin: 0 0 1.25rem;
}

h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  line-height: 1.12;
  margin: 0 0 1.25rem;
  letter-spacing: 0.01em;
}

.lede {
  font-family: var(--serif);
  font-size: clamp(1.35rem, 3.4vw, 1.8rem);
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 1rem;
}

.hero-note {
  color: var(--ink-soft);
  max-width: 38rem;
  margin: 0 0 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.btn {
  display: inline-block;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: 2px;
  text-decoration: none;
  border: 1px solid var(--forest);
  transition: background 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--forest);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--ochre);
  border-color: var(--ochre);
}

html[data-theme="dark"] .btn-primary {
  color: #1d2b25;
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
}

.btn-secondary:hover {
  border-color: var(--ochre);
  color: var(--ochre);
}

/* 分隔线 */
.rule {
  border: none;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* 章节 */
.section {
  padding: 3.5rem 0;
}

h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.25;
  margin: 0 0 1.5rem;
}

h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.25rem;
  margin: 0 0 0.6rem;
}

.section-note {
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 42rem;
  margin: 0 0 1.5rem;
}

.prose {
  max-width: 42rem;
}

.prose p {
  margin: 0 0 1.1rem;
}

.quote {
  margin: 1.75rem 0;
  padding: 0 0 0 1.25rem;
  border-left: 2px solid var(--ochre);
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.65;
}

.quote p {
  margin: 0;
}

/* 流程示意 */
.flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
}

.flow-step {
  flex: 1 1 0;
  min-width: 0;
}

.flow-card {
  height: 100%;
  padding: 1.5rem 1.35rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 3px;
}

.flow-num {
  display: block;
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--ochre);
  margin-bottom: 0.75rem;
  letter-spacing: 0.08em;
}

.flow-card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--ink-soft);
}

.flow-connector {
  display: flex;
  align-items: center;
  color: var(--ochre);
  flex: 0 0 auto;
}

/* 表格 */
.table-wrap {
  overflow-x: auto;
  margin-bottom: 1.25rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
  min-width: 34rem;
}

caption {
  text-align: left;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink-soft);
  padding-bottom: 0.9rem;
  caption-side: top;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 1rem 0.85rem 0;
  border-bottom: 1px solid var(--line);
  line-height: 1.6;
}

thead th {
  font-weight: 400;
  color: var(--ochre);
  border-bottom: 1px solid var(--ink);
  white-space: nowrap;
}

tbody th {
  font-weight: 400;
  white-space: nowrap;
}

td {
  color: var(--ink-soft);
}

/* 本地说明 */
.steps {
  margin: 0 0 1.5rem;
  padding-left: 1.4rem;
}

.steps li {
  margin-bottom: 0.7rem;
}

.limits {
  margin: 0;
  padding-left: 1.4rem;
}

.limits li {
  margin-bottom: 0.7rem;
  color: var(--ink-soft);
}

.prose h3 {
  margin-top: 2.25rem;
}

/* 末尾 CTA */
.cta {
  padding-bottom: 4rem;
}

.source-link {
  margin-top: 2rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  word-break: break-all;
}

.source-link a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.source-link a:hover {
  color: var(--ochre);
  border-bottom-color: var(--ochre);
}

/* 页脚 */
.site-footer {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  justify-content: space-between;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.site-footer a:hover {
  color: var(--ochre);
  border-bottom-color: var(--ochre);
}

/* 移动端：单列，不溢出 */
@media (max-width: 640px) {
  .hero {
    padding: 3rem 0 2.5rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .flow {
    flex-direction: column;
  }

  .flow-connector {
    justify-content: center;
    padding: 0.25rem 0;
  }

  .flow-connector svg {
    transform: rotate(90deg);
  }

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .theme-toggle {
    margin-left: 0;
    width: 100%;
    margin-top: 0.5rem;
  }

  .site-footer {
    flex-direction: column;
  }
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

:root{color-scheme:light}html[data-theme="dark"]{color-scheme:dark}