:root {
  --paper: #f7f2e6;
  --paper-line: rgba(43, 33, 24, 0.05);
  --ink: #2b2118;
  --ink-soft: #8a7b66;
  --gold: #d9a93c;
  --gold-deep: #b8892a;
  --card: #fffdf6;
  --card-border: rgba(43, 33, 24, 0.16);
  --shadow: rgba(43, 33, 24, 0.22);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #1c1712;
  --paper-line: rgba(241, 233, 216, 0.05);
  --ink: #f1e9d8;
  --ink-soft: #a8977c;
  --gold: #e6b94a;
  --gold-deep: #f0c869;
  --card: #2b2118;
  --card-border: rgba(241, 233, 216, 0.14);
  --shadow: rgba(0, 0, 0, 0.4);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --paper: #1c1712;
    --paper-line: rgba(241, 233, 216, 0.05);
    --ink: #f1e9d8;
    --ink-soft: #a8977c;
    --gold: #e6b94a;
    --gold-deep: #f0c869;
    --card: #2b2118;
    --card-border: rgba(241, 233, 216, 0.14);
    --shadow: rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "LXGW WenKai Screen R", Georgia, "Songti SC", serif;
  color: var(--ink);
  background-color: var(--paper);
  background-image: linear-gradient(var(--paper-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px);
  background-size: 28px 28px;
  min-height: 100svh;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.4s ease, color 0.4s ease;
}

.page {
  width: min(560px, 88vw);
  margin: 0 auto;
  padding: clamp(48px, 10vh, 96px) 0 64px;
  position: relative;
}

/* ---- 主题切换:胶片卷标式拨钮 ---- */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: 3px 3px 0 var(--shadow);
  cursor: pointer;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease,
    background-color 0.4s ease, border-color 0.4s ease;
  z-index: 20;
}

.theme-toggle:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--shadow);
}

.theme-toggle:active {
  transform: translate(3px, 3px) scale(0.98);
  box-shadow: 0 0 0 var(--shadow);
}

/* ---- 回到顶部:与主题按钮同语言,滚动到一定距离才出现 ---- */
.back-to-top {
  position: fixed;
  top: 66px;
  right: 20px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: 3px 3px 0 var(--shadow);
  color: var(--ink-soft);
  cursor: pointer;
  z-index: 20;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: transform 0.18s ease, box-shadow 0.15s ease,
    opacity 0.18s ease, visibility 0.18s, background-color 0.4s ease,
    border-color 0.4s ease;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--shadow);
}

.back-to-top:active {
  transform: translate(3px, 3px) scale(0.95);
  box-shadow: 0 0 0 var(--shadow);
}

.back-to-top .arrow {
  transition: transform 0.2s ease;
}

.back-to-top:hover .arrow {
  transform: translateY(-2px);
}

@media (max-width: 600px) {
  .back-to-top {
    top: 60px;
    right: 14px;
  }
}

.theme-toggle .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  transition: transform 0.15s ease;
}

.theme-toggle:active .dot {
  transform: scale(1.3);
}

/* 主题切换:柔和的单次明暗过渡,不遮挡内容、不闪烁 */
.theme-flicker {
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  background: var(--ink);
  opacity: 0;
}

.theme-flicker.flickering {
  animation: dim-pulse 0.7s ease;
}

@keyframes dim-pulse {
  0% {
    opacity: 0;
  }
  45% {
    opacity: 0.14;
  }
  100% {
    opacity: 0;
  }
}

/* ---- 头像:斜贴的相片 ---- */
.portrait {
  width: 128px;
  height: 128px;
  margin: 0 auto;
  padding: 6px;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: 5px 5px 0 var(--shadow);
  transform: rotate(-3deg);
  transition: transform 0.2s ease, background-color 0.4s ease,
    border-color 0.4s ease;
  cursor: pointer;
}

.portrait:hover {
  transform: rotate(0deg) scale(1.03);
}

.portrait img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---- 头像彩蛋气泡 ---- */
.burst {
  position: absolute;
  left: 50%;
  top: 40px;
  transform: translate(-50%, 0) scale(0.6) rotate(-6deg);
  padding: 6px 16px;
  background: var(--gold);
  color: var(--ink);
  border: 2px solid var(--ink);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.05em;
  opacity: 0;
  pointer-events: none;
  z-index: 15;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.burst::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 24px;
  width: 12px;
  height: 12px;
  background: var(--gold);
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(45deg);
}

.burst.show {
  opacity: 1;
  transform: translate(-50%, -14px) scale(1) rotate(-4deg);
  transition: opacity 0.22s cubic-bezier(0.34, 1.56, 0.64, 1),
    transform 0.32s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- 标题与手绘金线 ---- */
.name {
  margin: 36px 0 0;
  font-size: clamp(40px, 8vw, 52px);
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.name-underline {
  display: block;
  width: 180px;
  height: 10px;
  margin: 10px auto 0;
}

.name-underline path {
  fill: none;
  stroke: var(--gold-deep);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: draw 0.6s ease forwards;
  animation-delay: 0.5s;
}

@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

.bio {
  margin: 18px 0 0;
  font-size: 18px;
  font-weight: 400;
  text-align: center;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
}

/* ---- 链接:索引卡 ---- */
.links {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: 6px 6px 0 var(--shadow);
  color: var(--ink);
  text-decoration: none;
  font-size: 18px;
  transition: transform 0.18s ease, box-shadow 0.18s ease,
    background-color 0.4s ease, border-color 0.4s ease;
}

.card:hover {
  transform: translate(3px, 3px);
  box-shadow: 3px 3px 0 var(--shadow);
}

.card:active {
  transform: translate(6px, 6px);
  box-shadow: 0 0 0 var(--shadow);
}

.card:focus-visible {
  outline: 2px solid var(--gold-deep);
  outline-offset: 3px;
}

.card .icon-box {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  border: 1px solid var(--card-border);
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.card .icon-box svg {
  width: 24px;
  height: 24px;
  stroke: var(--ink);
  fill: none;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card .title {
  flex: 1;
  letter-spacing: 0.04em;
}

.card .arrow {
  color: var(--ink-soft);
  transition: transform 0.18s ease, color 0.18s ease;
}

.card:hover .arrow {
  transform: translateX(4px);
  color: var(--gold-deep);
}

.card .stamp {
  position: absolute;
  top: -10px;
  right: 14px;
  padding: 2px 8px;
  background: var(--gold);
  border: 1px dashed rgba(43, 33, 24, 0.45);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink);
  transform: rotate(3deg);
  transition: transform 0.15s ease;
}

.card:nth-child(even) .stamp {
  transform: rotate(-3deg);
}

.card:hover .stamp {
  transform: rotate(0deg);
}

/* ---- 页脚 ---- */
.footer {
  margin-top: 64px;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--ink-soft);
}

/* ---- 入场动画 ---- */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.rise {
  opacity: 0;
  animation: rise 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: calc(var(--i, 0) * 90ms);
}

.portrait.rise {
  animation-name: rise-portrait;
}

@keyframes rise-portrait {
  from {
    opacity: 0;
    transform: rotate(-3deg) translateY(16px);
  }
  to {
    opacity: 1;
    transform: rotate(-3deg);
  }
}

@media (max-width: 600px) {
  .theme-toggle {
    top: 14px;
    right: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
  .theme-veil.animating {
    transition: none;
  }
}