/* ============================================================================
   STARLESS 个人网站
   ----------------------------------------------------------------------------
   第一层:通用主题(令牌 + 组件),取自 design skill 的参考实现
   第二层:站点层(Hero 副题、足迹卡、留言板、页脚、动效)
   深色为默认:html.dark;去掉即浅色。
   ========================================================================== */

/* --- 1. 设计令牌 ---------------------------------------------------------- */
:root {
  --ds-brand-1: #b8863f;
  --ds-brand-2: #a8752f;
  --ds-brand-3: #8f5f1f;
  --ds-brand-soft: rgba(184, 134, 63, .14);

  --ds-bg: #ffffff;
  --ds-bg-alt: #f6f6f7;
  --ds-bg-soft: #f6f6f7;
  --ds-border: #c2c2c4;
  --ds-divider: #e2e2e3;

  --ds-text-1: #3c3c43;
  --ds-text-2: #67676c;
  --ds-text-3: #929295;

  --ds-font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --ds-font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  --ds-radius-card: 12px;
  --ds-radius-pill: 20px;
  --ds-radius-img: 4px;

  --ds-shadow-book: 0 6px 24px rgba(0, 0, 0, .14), 0 2px 6px rgba(0, 0, 0, .1);
  --ds-shadow-book-hover: 0 14px 40px rgba(0, 0, 0, .22), 0 4px 10px rgba(0, 0, 0, .12);

  --ds-nav-height: 64px;
  --ds-max-width: 1152px;
  --ds-reading-width: 760px;

  --ds-ease: .25s ease;

  --site-danger: #b8272c;

  color-scheme: light;
}

.dark {
  --ds-brand-1: #d8b878;
  --ds-brand-2: #cda96e;
  --ds-brand-3: #b8863f;
  --ds-brand-soft: rgba(205, 169, 110, .16);

  --ds-bg: #1b1b1f;
  --ds-bg-alt: #161618;
  --ds-bg-soft: #202127;
  --ds-border: #3c3f44;
  --ds-divider: #2e2e32;

  --ds-text-1: #dfdfd6;
  --ds-text-2: #98989f;
  --ds-text-3: #6a6a71;

  --site-danger: #f66f81;

  color-scheme: dark;
}

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

/* 锚点落点避开固定顶栏 */
html { scroll-padding-top: calc(var(--ds-nav-height) + 8px); }

/* 隐藏滚动条,但滚动照常(只藏滚动条本身,不动 overflow):
   页面位置由顶部 2px 金色进度条提示。Firefox/新版 Chrome 用 scrollbar-width,
   Safari 与旧 Blink 用 ::-webkit-scrollbar */
html { scrollbar-width: none; }
html::-webkit-scrollbar { display: none; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  font-family: var(--ds-font-serif);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ds-text-1);
  background-color: var(--ds-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizelegibility;
  -webkit-text-size-adjust: 100%;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, h5, h6 { margin: 0; }
p { margin: 0; }

::selection { background: var(--ds-brand-soft); }

/* 触摸端点击链接/按钮时,浏览器会盖一层默认高亮块(Chrome、Safari、微信内置浏览器呈蓝色)→ 去掉 */
html { -webkit-tap-highlight-color: transparent; }
/* 焦点圈只留给键盘操作:鼠标与触摸点击后不再留蓝框,Tab 导航照旧 */
:focus:not(:focus-visible) { outline: none; }

/* --- 3. 顶栏 -------------------------------------------------------------- */
.ds-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 30;
  height: var(--ds-nav-height);
  background-color: var(--ds-bg);
  border-bottom: 1px solid transparent;
  transition: background-color var(--ds-ease), border-color var(--ds-ease);
}
.ds-nav--top { background-color: transparent; border-bottom-color: transparent; }
.ds-nav--scrolled { border-bottom-color: var(--ds-divider); }
.ds-nav__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 100%;
  max-width: var(--ds-max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.ds-nav__title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .18em;
  transition: color var(--ds-ease);
}
.ds-nav__title:hover { color: var(--ds-brand-1); }
/* 站标:方形小圆角头像,悬停时描边点亮(与卡片动效同一套) */
.ds-nav__logo {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 5px;
  object-fit: cover;
  background-color: var(--ds-bg-soft);
  border: 1px solid var(--ds-divider);
  transition: border-color var(--ds-ease);
}
.ds-nav__title:hover .ds-nav__logo { border-color: var(--ds-brand-1); }
.ds-nav__links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
  font-size: 14px;
  font-weight: 500;
  color: var(--ds-text-2);
}
.ds-nav__links a { transition: color var(--ds-ease); }
.ds-nav__links a:hover { color: var(--ds-brand-1); }
/* 菜单按钮:仅小屏出现,三横线展开后变叉 */
.ds-nav__burger {
  display: none;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--ds-divider);
  background: transparent;
  color: var(--ds-text-2);
  cursor: pointer;
  transition: color var(--ds-ease), border-color var(--ds-ease);
}
.ds-nav__burger:hover { color: var(--ds-brand-1); border-color: var(--ds-brand-1); }
.ds-nav__burger-lines { position: relative; display: block; width: 16px; height: 12px; }
.ds-nav__burger-lines > span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  border-radius: 2px;
  background-color: currentColor;
  transition: top .3s ease, transform .3s ease, opacity .2s ease;
}
.ds-nav__burger-lines > span:nth-child(1) { top: 0; }
.ds-nav__burger-lines > span:nth-child(2) { top: 5.25px; }
.ds-nav__burger-lines > span:nth-child(3) { top: 10.5px; }
.ds-nav__burger.is-open .ds-nav__burger-lines > span:nth-child(1) { top: 5.25px; transform: rotate(45deg); }
.ds-nav__burger.is-open .ds-nav__burger-lines > span:nth-child(2) { opacity: 0; transform: scaleX(.3); }
.ds-nav__burger.is-open .ds-nav__burger-lines > span:nth-child(3) { top: 5.25px; transform: rotate(-45deg); }

/* 主题切换 */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--ds-divider);
  background: transparent;
  color: var(--ds-text-2);
  cursor: pointer;
  transition: color var(--ds-ease), border-color var(--ds-ease);
}
.theme-toggle:hover { color: var(--ds-brand-1); border-color: var(--ds-brand-1); }
.theme-toggle svg { width: 18px; height: 18px; }
html.dark .theme-toggle .icon-moon { display: none; }
html:not(.dark) .theme-toggle .icon-sun { display: none; }

/* 小屏:链接收进按钮展开的面板,顶栏只留站名 + 主题 + 菜单 */
@media (max-width: 640px) {
  :root { --ds-nav-height: 56px; }
  .ds-nav__inner { padding: 0 16px; gap: 12px; }
  .ds-nav__title { letter-spacing: .12em; }
  .theme-toggle { margin-left: auto; }
  .ds-nav__burger { display: inline-flex; }

  .ds-nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: grid;
    gap: 2px;
    margin-left: 0;
    padding: 8px 12px 14px;
    background-color: var(--ds-bg);
    border-bottom: 1px solid var(--ds-divider);
    box-shadow: 0 16px 28px rgba(0, 0, 0, .22);
    max-height: calc(100vh - var(--ds-nav-height));
    overflow-y: auto;
    font-size: 15px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s;
  }
  /* 面板展开时顶栏强制表面化,免得首屏透明底上"浮"着菜单 */
  .ds-nav.is-menu-open { background-color: var(--ds-bg); border-bottom-color: var(--ds-divider); }
  .ds-nav.is-menu-open .ds-nav__links { opacity: 1; visibility: visible; transform: none; }
  .ds-nav__links a { padding: 11px 12px; border-radius: 8px; }
  .ds-nav__links a:hover,
  .ds-nav__links a:active { color: var(--ds-brand-1); background-color: var(--ds-bg-soft); }
}

/* --- 4. Hero -------------------------------------------------------------- */
.ds-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  max-width: var(--ds-max-width);
  margin: 0 auto;
  padding: calc(var(--ds-nav-height) + 72px) 24px 48px;
}
@media (min-width: 960px) {
  .ds-hero { grid-template-columns: minmax(0, 592px) minmax(0, 1fr); padding-inline: 64px; }
}
.ds-hero__name {
  font-size: 56px;
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: .04em;
  background-image: linear-gradient(120deg, var(--ds-brand-1), var(--ds-brand-3));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--ds-brand-1);
}
.ds-hero__tagline {
  margin-top: 14px;
  font-size: 24px;
  line-height: 1.5;
  font-weight: 500;
  color: var(--ds-text-2);
  letter-spacing: .06em;
}
.ds-hero__actions { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 12px; }
@media (max-width: 959px) {
  .ds-hero { text-align: center; padding-top: calc(var(--ds-nav-height) + 40px); }
  .ds-hero__name { font-size: 40px; }
  .ds-hero__tagline { font-size: 18px; }
  .ds-hero__actions { justify-content: center; }
}

/* 胶囊按钮 */
.ds-btn {
  display: inline-block;
  padding: 0 20px;
  line-height: 38px;
  border-radius: var(--ds-radius-pill);
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background-color: var(--ds-brand-3);
  transition: background-color var(--ds-ease), border-color var(--ds-ease), color var(--ds-ease);
  cursor: pointer;
}
.ds-btn:hover { background-color: var(--ds-brand-2); }
.dark .ds-btn { background-color: var(--ds-brand-3); }
.ds-btn--large { line-height: 46px; padding: 0 28px; font-size: 15px; }
/* ghost 变体:双类名保证能压过 `.dark .ds-btn` 的实心底 */
.ds-btn.ds-btn--ghost { background-color: transparent; border-color: var(--ds-divider); color: var(--ds-text-1); }
.ds-btn.ds-btn--ghost:hover { background-color: transparent; border-color: var(--ds-brand-1); color: var(--ds-brand-1); }

/* --- 5. 特性卡 ------------------------------------------------------------ */
.ds-features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  max-width: var(--ds-max-width);
  margin: 0 auto;
  padding: 32px 24px 0;
}
@media (max-width: 959px) { .ds-features { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .ds-features { grid-template-columns: 1fr; } }
.ds-feature {
  padding: 24px;
  border-radius: var(--ds-radius-card);
  background-color: var(--ds-bg-soft);
  border: 1px solid var(--ds-bg-soft);
  transition: border-color var(--ds-ease), transform var(--ds-ease);
}
.ds-feature:hover { border-color: var(--ds-brand-1); transform: translateY(-4px); }
.ds-feature__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 6px;
  font-size: 24px;
  background-color: var(--ds-brand-soft);
}
.ds-feature__title { margin-top: 20px; font-size: 16px; font-weight: 600; }
.ds-feature__text { margin-top: 8px; font-size: 14px; line-height: 1.7; color: var(--ds-text-2); }

/* --- 6. 区块标题 ---------------------------------------------------------- */
.ds-section-title { text-align: center; max-width: var(--ds-max-width); margin: 72px auto 8px; padding: 0 24px; }
.ds-section-title h2 { font-size: 26px; font-weight: 700; color: var(--ds-text-1); }
.ds-section-title p { margin-top: 6px; font-size: 15px; color: var(--ds-text-2); }

/* --- 7. 卡片网格 ---------------------------------------------------------- */
.ds-shelf {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 32px;
  max-width: var(--ds-max-width);
  margin: 16px auto 8px;
  padding: 0 24px;
}
@media (max-width: 640px) {
  .ds-shelf { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 20px; padding: 0 16px; }
}
.ds-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--ds-radius-card);
  overflow: hidden;
  background-color: var(--ds-bg-soft);
  border: 1px solid var(--ds-divider);
  color: inherit;
  transition: transform var(--ds-ease), box-shadow var(--ds-ease), border-color var(--ds-ease);
}
.ds-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--ds-shadow-book-hover);
  border-color: var(--ds-brand-1);
}
.ds-card__body { display: flex; flex-direction: column; gap: 6px; flex: 1; padding: 16px 18px 20px; }
.ds-card__title { font-size: 20px; font-weight: 700; line-height: 1.3; }
.ds-card__year { margin-left: 8px; font-size: 12.5px; font-weight: 400; color: var(--ds-text-3); letter-spacing: .02em; }
.ds-card__subtitle { font-size: 13px; font-weight: 600; color: var(--ds-brand-1); }
.ds-card__intro { margin-top: 2px; font-size: 13.5px; line-height: 1.6; color: var(--ds-text-2); }
@media (max-width: 640px) {
  .ds-card__title { font-size: 17px; }
  .ds-card__intro { display: none; }
}

/* --- 8. 长文阅读排版 ------------------------------------------------------ */
.ds-reading {
  max-width: var(--ds-reading-width);
  margin: 0 auto;
  padding: 0 24px;
  font-family: var(--ds-font-serif);
  font-size: 17px;
  line-height: 1.85;
}
.ds-reading p { text-indent: 2em; margin: .85em 0; }
.ds-reading h1 + p, .ds-reading h2 + p, .ds-reading h3 + p { text-indent: 0; }

/* --- 9. 阅读进度条 -------------------------------------------------------- */
.ds-progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 51; pointer-events: none; }
.ds-progress__bar { height: 100%; width: 0; background-color: var(--ds-brand-1); transition: width .08s linear; }

/* --- 10. 页脚 ------------------------------------------------------------- */
.site-footer {
  margin-top: 96px;
  padding: 48px 24px 64px;
  border-top: 1px solid var(--ds-divider);
  text-align: center;
}
.site-footer__motto {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--ds-brand-1);
}
.site-footer__meta { margin-top: 10px; font-size: 13px; color: var(--ds-text-3); }

/* ============================================================================
   站点层
   ========================================================================== */

/* --- Hero 副题 ------------------------------------------------------------ */
.hero-sub {
  margin-top: 18px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ds-text-2);
}
@media (max-width: 959px) { .hero-sub { margin-inline: auto; } }

/* --- Hero 主视觉:山海插画 ------------------------------------------------ */
.hero-art { margin: 0; display: grid; gap: 12px; justify-items: center; }
.hero-art svg {
  width: 100%;
  max-width: 380px;
  border-radius: 8px;
  border: 1px solid var(--ds-divider);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .28);
}
.hero-art__cap { font-size: 12.5px; letter-spacing: .1em; color: var(--ds-text-3); }
@media (max-width: 959px) {
  .hero-art { order: -1; }
  .hero-art svg { max-width: 300px; }
}

/* 光晕呼吸 + 雁阵缓移:极轻,不抢注意力 */
.sun-glow { transform-box: fill-box; transform-origin: center; animation: sunBreath 7s ease-in-out infinite; }
@keyframes sunBreath {
  0%, 100% { transform: scale(1); opacity: .92; }
  50%      { transform: scale(1.055); opacity: 1; }
}
.birds { animation: birdsDrift 16s ease-in-out infinite alternate; }
@keyframes birdsDrift {
  from { transform: translateX(0); }
  to   { transform: translateX(20px); }
}

/* --- 关于:头像 ------------------------------------------------------------ */
.about-portrait {
  display: block;
  width: 112px;
  height: 112px;
  margin: 28px auto 4px;
  border-radius: 5px; /* 与顶栏站标一致的小圆角,完整显示原图 */
  object-fit: cover;
  border: 1px solid var(--ds-divider);
  box-shadow: 0 0 0 4px var(--ds-brand-soft); /* 金色柔光外框,和顶栏站标同一张图 */
}

/* --- 足迹卡:无封面版,改用图标座 ---------------------------------------- */
.journey-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.journey-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 24px 18px 0;
  border-radius: 6px;
  font-size: 24px;
  background-color: var(--ds-brand-soft);
}
@media (max-width: 640px) {
  .journey-grid { grid-template-columns: 1fr; }
  .journey-card__icon { margin: 20px 16px 0; width: 40px; height: 40px; font-size: 20px; }
}

/* --- 留言板 --------------------------------------------------------------- */
.guestbook {
  display: grid;
  gap: 40px;
  max-width: 720px;
  margin: 32px auto 0;
  padding: 0 24px;
}
.guestbook__form {
  display: grid;
  gap: 18px;
  padding: 24px;
  border-radius: var(--ds-radius-card);
  background-color: var(--ds-bg-soft);
  border: 1px solid var(--ds-divider);
}
.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ds-text-2);
}
.field input,
.field textarea {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--ds-divider);
  background-color: var(--ds-bg);
  color: var(--ds-text-1);
  font-family: inherit;
  font-size: 14.5px;
  line-height: 1.6;
  transition: border-color var(--ds-ease), box-shadow var(--ds-ease);
}
.field textarea { resize: vertical; min-height: 84px; }
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--ds-brand-1);
  box-shadow: 0 0 0 3px var(--ds-brand-soft);
}
.field input::placeholder,
.field textarea::placeholder { color: var(--ds-text-3); }
.field__meta { margin-top: 6px; text-align: right; font-size: 12px; color: var(--ds-text-3); }

.guestbook__actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.guestbook__actions .ds-btn { border: none; }
.guestbook__actions .ds-btn:disabled { opacity: .6; cursor: wait; }
.guestbook__status { font-size: 13px; color: var(--ds-text-2); }
.guestbook__status.is-error { color: var(--site-danger); }

.guestbook__list { display: grid; gap: 12px; }
.guestbook__empty { padding: 32px 0; text-align: center; font-size: 14px; color: var(--ds-text-3); }
.msg {
  padding: 16px 18px;
  border-radius: var(--ds-radius-card);
  background-color: var(--ds-bg-soft);
  border: 1px solid var(--ds-divider);
  animation: msgIn .45s ease both;
}
@keyframes msgIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}
.msg__head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.msg__name { min-width: 0; overflow-wrap: anywhere; font-size: 13.5px; font-weight: 600; color: var(--ds-brand-1); }
.msg__time { flex: none; font-size: 12.5px; color: var(--ds-text-3); }
.msg__text { margin-top: 8px; font-size: 14.5px; line-height: 1.75; white-space: pre-wrap; overflow-wrap: break-word; }

/* iOS 在字号小于 16px 的输入框上聚焦时会自动放大整页(触摸机宽度普遍 ≤640px) */
@media (max-width: 640px) {
  .field input, .field textarea { font-size: 16px; }
}

/* --- 360px 档:小屏做减法,不是等比压缩 ----------------------------------- */
@media (max-width: 400px) {
  .ds-hero { gap: 28px; padding-inline: 16px; padding-bottom: 40px; }
  .ds-hero__name { font-size: 34px; letter-spacing: .02em; }
  .ds-hero__tagline { font-size: 16px; letter-spacing: .04em; }
  .hero-sub { font-size: 14.5px; line-height: 1.8; }
  .hero-art svg { max-width: 232px; }
  .hero-art__cap { font-size: 12px; }
  .ds-hero__actions { margin-top: 26px; gap: 10px; }
  .ds-btn--large { line-height: 44px; padding: 0 20px; font-size: 14.5px; }

  .ds-features { padding: 26px 16px 0; }
  .ds-feature { padding: 20px; }

  .ds-section-title { margin-top: 56px; padding: 0 16px; }
  .ds-section-title h2 { font-size: 22px; }
  .ds-section-title p { font-size: 14px; }

  .journey-grid { gap: 16px; }
  .journey-card__icon { margin: 18px 16px 0; }
  .ds-card__body { padding: 14px 16px 18px; }

  .ds-reading { padding: 0 16px; font-size: 16px; line-height: 1.9; }

  .about-portrait { width: 96px; height: 96px; margin-top: 24px; }

  .guestbook { gap: 32px; padding: 0 16px; }
  .guestbook__form { padding: 18px 16px; }
  .msg { padding: 14px 16px; }

  .site-footer { margin-top: 72px; padding: 40px 16px 52px; }
  .site-footer__motto { font-size: 16px; letter-spacing: .12em; }
  .site-footer__meta { font-size: 12px; }
}

/* --- 进入视口的淡入 -------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* --- 降低动效偏好 ---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .sun-glow, .birds { animation: none; }
  .msg { animation: none; }
  .ds-nav__links { transition: none; }
  .ds-nav__burger-lines > span { transition: none; }
  .field input:focus, .field textarea:focus { box-shadow: none; }
}

/* --- 打印:只留文字 -------------------------------------------------------- */
@media print {
  .ds-nav, .ds-progress, .site-footer, .hero-art, .about-portrait, .guestbook__form { display: none !important; }
  .reveal { opacity: 1; transform: none; }
  body { background: #fff; color: #000; }
}