/* =========================================================
   个人展示网站 · 水墨科幻风格样式表
   结构：变量 → 基础 → 纸纹与画布层 → 布局 → 导航 → 组件
        → 区块 → 页脚 → 响应式 → 动效
   说明：配色取自墨黑 / 灰 / 宣纸白 / 暗青；不使用渐变紫蓝、
        不使用较新的颜色混合函数（一律提供静态 rgba 变量），
        显式置零所有圆角（border-radius: 0），无堆叠卡片。
   ========================================================= */

/* ---------------- 1. 主题变量 ---------------- */
:root {
  --paper: #0b0c0d;
  --paper-2: #0f1213;
  --ink: #e6e3dc;
  --ink-soft: #9ba1a1;
  --ink-faint: #62686a;
  --line: rgba(230, 227, 220, 0.13);
  --line-strong: rgba(230, 227, 220, 0.28);
  --qing: #7ba7a3;
  --qing-deep: #1c2a2a;
  --header-bg: rgba(11, 12, 13, 0.82);
  --grain-opacity: 0.06;
  --grain-blend: screen;
  --font-serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --container: 1100px;
  --header-h: 66px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.3s var(--ease);

  /* 主色别名：墨黑 / 灰 / 宣纸白 / 暗青（随主题自动解析，供脚本与文档统一引用） */
  --ink-black: var(--paper);
  --ink-gray: var(--ink-soft);
  --ink-white: var(--ink);
  --dark-cyan: var(--qing);
}

html[data-theme="light"] {
  --paper: #eeeae1;
  --paper-2: #e6e1d6;
  --ink: #14171a;
  --ink-soft: #4d5457;
  --ink-faint: #8b9092;
  --line: rgba(20, 23, 26, 0.16);
  --line-strong: rgba(20, 23, 26, 0.34);
  --qing: #2f4f4f;
  --qing-deep: #d5dbd7;
  --header-bg: rgba(238, 234, 225, 0.86);
  --grain-opacity: 0.09;
  --grain-blend: multiply;
}

/* ---------------- 2. 基础样式 ---------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background-color: var(--paper);
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

body.nav-open { overflow: hidden; }

img { max-width: 100%; display: block; }

a { color: var(--ink); text-decoration: none; transition: color var(--transition), opacity var(--transition); }
a:hover { color: var(--qing); }

h1, h2, h3, h4 {
  margin: 0 0 0.55em;
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0.06em;
}
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }

:focus-visible { outline: 1px solid var(--qing); outline-offset: 3px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  z-index: 300;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------------- 3. 纸纹层与画布层 ---------------- */
/* 宣纸颗粒：极淡噪点，fingerprint 由 SVG feTurbulence 生成，无外部请求 */
.paper-grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: var(--grain-blend);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23g)'/%3E%3C/svg%3E");
  background-size: 220px 220px;
}

/* 水墨波浪 + 浮动甲骨文画布（js/main.js 的 InkField 引擎绘制） */
.ink-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

/* 边角墨晕：极淡的墨与暗青堆积，制造深度 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 46% at 8% 4%, rgba(123, 167, 163, 0.1), rgba(123, 167, 163, 0) 68%),
    radial-gradient(52% 44% at 96% 92%, rgba(180, 186, 182, 0.07), rgba(180, 186, 182, 0) 70%);
}

html[data-theme="light"] body::before {
  background:
    radial-gradient(58% 46% at 8% 4%, rgba(47, 79, 79, 0.09), rgba(47, 79, 79, 0) 68%),
    radial-gradient(52% 44% at 96% 92%, rgba(20, 23, 26, 0.07), rgba(20, 23, 26, 0) 70%);
}

/* ---------------- 4. 布局 ---------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 2;
}

.site-header,
main,
.site-footer { position: relative; z-index: 2; }

.section { padding: 118px 0; }

.section--line {
  border-top: 1px solid var(--line);
}

.section__head { max-width: 640px; margin-bottom: 56px; }
.section__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--qing);
}
.section__title {
  font-size: clamp(26px, 3.6vw, 40px);
  margin-bottom: 14px;
}
.section__title::after {
  content: "";
  display: block;
  width: 46px;
  height: 1px;
  margin-top: 16px;
  background-color: var(--line-strong);
}
.section__lead { color: var(--ink-soft); margin: 0; font-size: 15px; }

/* ---------------- 5. 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition), border-color var(--transition);
}
.site-header.is-scrolled {
  background-color: var(--header-bg);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand__mark {
  width: 26px;
  height: 26px;
  stroke: var(--qing);
  stroke-width: 4;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.brand__name {
  font-family: var(--font-serif);
  font-size: 17px;
  letter-spacing: 0.22em;
  color: var(--ink);
}

.nav__list { display: flex; align-items: center; gap: 4px; }
.nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 13px;
  color: var(--ink-soft);
  font-size: 14px;
  letter-spacing: 0.1em;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.nav__link i {
  font-style: normal;
  font-size: 11px;
  color: var(--ink-faint);
  transition: color var(--transition);
}
.nav__link:hover { color: var(--ink); }
.nav__link.is-active { color: var(--ink); border-bottom-color: var(--qing); }
.nav__link.is-active i { color: var(--qing); }

.header__actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 0;
  background-color: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-strong); }
.icon-btn .icon {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

html[data-theme="dark"] .icon--sun { display: none; }
html[data-theme="light"] .icon--moon { display: none; }

.nav-toggle { display: none; }
.nav-toggle__bar {
  display: block;
  width: 16px;
  height: 1px;
  margin: 2.5px 0;
  background-color: currentColor;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(3.5px) rotate(28deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-3.5px) rotate(-28deg); }

/* ---------------- 6. 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background-color: transparent;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}
.btn:hover { background-color: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--solid { border-color: var(--ink); }
.btn--block { width: 100%; }

/* ---------------- 7. Hero ---------------- */
.hero {
  padding: calc(96px + var(--header-h)) 0 116px;
}
.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 200px;
  align-items: center;
  gap: 60px;
}
.hero__eyebrow {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--qing);
}
.hero__name {
  font-size: clamp(42px, 7.6vw, 82px);
  letter-spacing: 0.16em;
  margin: 0 0 22px;
}
.hero__rule {
  width: 72px;
  height: 1px;
  background-color: var(--line-strong);
  margin-bottom: 24px;
}
.hero__desc { max-width: 560px; color: var(--ink-soft); font-size: 15.5px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 30px 0 26px; }
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}
.hero__meta li { position: relative; padding-left: 14px; }
.hero__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background-color: var(--qing);
}

/* 头像位：细线方框 + 甲骨文「人」字形线条（非现代汉字） */
.hero__face {
  width: 200px;
  height: 200px;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  padding: 26px;
  background-color: transparent;
}
.hero__face svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: var(--ink-soft);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  object-fit: cover;
}
img.hero__face { padding: 0; object-fit: cover; }

/* ---------------- 8. 面板（细线分隔，非圆角卡片） ---------------- */
.panel {
  border-top: 1px solid var(--line-strong);
  padding-top: 22px;
  transition: border-color var(--transition);
}
.panel:hover { border-top-color: var(--qing); }
.panel p { color: var(--ink-soft); font-size: 15px; }
.panel p:last-child { margin-bottom: 0; }
.panel__title {
  font-size: 15px;
  letter-spacing: 0.2em;
  margin-bottom: 16px;
  color: var(--ink);
}

/* ---------------- 9. 关于 ---------------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 46px;
  align-items: start;
}

.info-list { display: grid; gap: 0; }
.info-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}
.info-list span { color: var(--ink-faint); letter-spacing: 0.1em; }
.info-list strong { font-weight: 400; text-align: right; color: var(--ink); word-break: break-all; }

.timeline { margin-top: 64px; }
.timeline__list { position: relative; padding-left: 20px; }
.timeline__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background-color: var(--line);
}
.timeline__item { position: relative; padding: 0 0 30px 22px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 11px;
  width: 7px;
  height: 7px;
  background-color: var(--paper);
  border: 1px solid var(--qing);
}
.timeline__time {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--qing);
}
.timeline__body h4 { margin: 6px 0 6px; font-size: 16px; letter-spacing: 0.08em; }
.timeline__body p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* ---------------- 10. 技能 ---------------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 46px;
}

.bars { display: grid; gap: 22px; }
.bar {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas: "label value" "track track";
  gap: 8px 12px;
  font-size: 14px;
}
.bar__label { grid-area: label; color: var(--ink); letter-spacing: 0.06em; }
.bar__value { grid-area: value; color: var(--ink-faint); font-style: normal; font-size: 12.5px; letter-spacing: 0.1em; }
.bar__track {
  grid-area: track;
  display: block;
  height: 1px;
  background-color: var(--line);
  position: relative;
}
.bar__fill {
  display: block;
  position: absolute;
  left: 0;
  top: -1px;
  height: 3px;
  width: var(--level, 0%);
  background-color: var(--ink-soft);
}
.bars.is-animated .bar__fill { transition: width 1.1s var(--ease), background-color var(--transition); }
.bars.is-animated .bar:hover .bar__fill { background-color: var(--qing); }

.tags { display: flex; flex-wrap: wrap; gap: 9px; }
.tag {
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink-soft);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  transition: border-color var(--transition), color var(--transition);
}
.tag:hover { border-color: var(--qing); color: var(--qing); }
.tags--sm .tag { padding: 3px 9px; font-size: 12px; }

/* ---------------- 11. 项目（列表式，去卡片堆叠感） ---------------- */
.projects { border-top: 1px solid var(--line-strong); }
.project {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 24px;
  align-items: start;
  padding: 26px 6px;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--transition), padding-left var(--transition);
}
.project:hover { background-color: rgba(123, 167, 163, 0.05); padding-left: 14px; }
.project__index {
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  padding-top: 3px;
}
.project:hover .project__index { color: var(--qing); }
.project__title { font-size: 18px; letter-spacing: 0.1em; margin-bottom: 8px; }
.project__desc { color: var(--ink-soft); font-size: 14.5px; margin-bottom: 12px; }
.project__links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.14em;
  white-space: nowrap;
  padding-top: 4px;
}
.project__links a { color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.project__links a:hover { color: var(--qing); border-bottom-color: var(--qing); }

/* ---------------- 12. 联系 ---------------- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 46px;
  align-items: start;
}
.contact__list { display: grid; gap: 0; }
.contact__list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}
.contact__label { color: var(--ink-faint); letter-spacing: 0.18em; font-size: 12.5px; padding-top: 3px; }
.contact__value { word-break: break-all; }

.contact__form { display: grid; gap: 22px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 12.5px; letter-spacing: 0.18em; color: var(--ink-faint); }
.field input,
.field textarea {
  width: 100%;
  padding: 9px 2px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background-color: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  transition: border-color var(--transition);
}
.field textarea { resize: vertical; min-height: 84px; }
.field input:focus,
.field textarea:focus { outline: none; border-bottom-color: var(--qing); }
.field input::placeholder,
.field textarea::placeholder { color: var(--ink-faint); opacity: 0.6; }

.form-hint { margin: 0; font-size: 13.5px; min-height: 20px; color: var(--ink-faint); }
.form-hint.is-error { color: #a4666b; }
.form-hint.is-ok { color: var(--qing); }

/* ---------------- 13. 页脚与返回顶部 ---------------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}
.footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }
.footer__inner p { margin: 0; }

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background-color: var(--paper);
  color: var(--ink-soft);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), color var(--transition), border-color var(--transition);
  z-index: 90;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { color: var(--qing); border-color: var(--qing); }
.back-to-top svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------------- 14. 入场动效 ---------------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .bar__fill { width: var(--level, 0%) !important; }
}

/* ---------------- 15. 响应式 ---------------- */
@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; justify-items: start; gap: 40px; }
  .hero__face { width: 150px; height: 150px; padding: 20px; }
  .about__grid,
  .contact__grid { grid-template-columns: 1fr; gap: 40px; }
  .skills__grid { gap: 40px; }
  .project { grid-template-columns: 44px 1fr; }
  .project__links { grid-column: 2; flex-direction: row; gap: 18px; padding-top: 0; }
}

@media (max-width: 760px) {
  :root { --header-h: 60px; }
  .container { padding: 0 20px; }
  .section { padding: 76px 0; }
  .hero { padding: calc(64px + var(--header-h)) 0 80px; }
  .section__head { margin-bottom: 40px; }

  .nav-toggle { display: grid; }
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background-color: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 14px 20px 24px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav__link { justify-content: flex-start; padding: 13px 2px; border-bottom: 1px solid var(--line); font-size: 16px; }
  .nav__link.is-active { border-bottom-color: var(--qing); }
  .brand__name { letter-spacing: 0.16em; }
  .hero__name { letter-spacing: 0.1em; }
  .back-to-top { right: 16px; bottom: 16px; }
}

@media (max-width: 420px) {
  .container { padding: 0 16px; }
  .btn { padding: 11px 20px; font-size: 14px; letter-spacing: 0.12em; }
  .hero__actions { width: 100%; }
  .hero__actions .btn { flex: 1 1 auto; }
  .project { grid-template-columns: 36px 1fr; gap: 14px; }
}