/* 主站首页 草案 B —— 城市插画首屏 + 纸色内容区
   用途：/enter/ 点猫进来之后落地的主站首页
   依赖：/new/assets/fonts/sub/fonts-subset.css（宋体子集）
         /new/assets/art/town-hero-{1600,900}.jpg（首屏插画，竖版裁切使用）
   修改：色值与首屏压暗程度集中在 :root；块顺序在 index.html 里 */

:root {
  --paper: #f6f1e7;
  --paper-2: #efe7d8;
  --ink: #241e1a;
  --ink-2: #4a4038;
  --muted: #8a7d6d;
  --line: rgba(36, 30, 26, 0.14);
  --line-strong: rgba(36, 30, 26, 0.26);
  --amber: #b0793a;
  --amber-lit: #f0cb92;
  --night: 10, 16, 26;      /* 首屏压暗用的底色（rgb 分量） */
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --ui: "Noto Serif SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }

body {
  background: radial-gradient(120% 90% at 50% -10%, #fbf7ef 0%, var(--paper) 46%, var(--paper-2) 100%);
  color: var(--ink);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 16px; top: 12px; z-index: 99;
  padding: 8px 14px;
  background: #fff; color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: 8px;
}

/* ---------- 一、首屏 ---------- */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  isolation: isolate;
  background: rgb(var(--night));
}
.hero__bg { position: absolute; inset: 0; z-index: -2; margin: 0; }
.hero__bg img {
  display: block;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 18%;
}
/* 压暗：左侧给字让位，上下各收一道 */
.hero::before {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(100deg,
      rgba(var(--night), 0.84) 0%,
      rgba(var(--night), 0.55) 24%,
      rgba(var(--night), 0.18) 46%,
      rgba(var(--night), 0) 64%),
    linear-gradient(180deg,
      rgba(var(--night), 0.42) 0%,
      rgba(var(--night), 0) 18%,
      rgba(var(--night), 0) 66%,
      rgba(var(--night), 0.34) 100%);
}

/* 顶栏压在图上 */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 26px clamp(24px, 5vw, 64px) 0;
}
.top__brand {
  display: flex; align-items: baseline; gap: 12px;
  color: #fff; text-decoration: none;
  font-size: 1.02rem; letter-spacing: 0.16em;
}
.top__brand span {
  font-family: var(--ui);
  font-size: 0.62rem; letter-spacing: 0.34em;
  color: rgba(255, 255, 255, 0.62);
}
.top__nav { display: flex; gap: clamp(16px, 2.4vw, 34px); }
.top__nav a {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  font-size: 0.9rem; letter-spacing: 0.14em;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: color 180ms, border-color 180ms;
}
.top__nav a:hover { color: var(--amber-lit); border-color: var(--amber-lit); }

.hero__text {
  max-width: 820px;
  padding: 0 clamp(24px, 5vw, 64px) clamp(64px, 12vh, 132px);
}
.hero__kicker {
  margin: 0 0 18px;
  font-family: var(--ui);
  font-size: 0.72rem; letter-spacing: 0.3em;
  color: var(--amber-lit);
  text-shadow: 0 1px 12px rgba(var(--night), 0.6);
}
.hero__title {
  margin: 0 0 22px;
  font-size: clamp(2.9rem, 7vw, 5.4rem);
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.1;
  color: #fff;
  text-shadow: 0 2px 30px rgba(var(--night), 0.55), 0 1px 2px rgba(var(--night), 0.5);
}
.hero__lede {
  margin: 0 0 clamp(28px, 4.5vh, 46px);
  text-wrap: pretty;
  font-size: clamp(0.98rem, 1.3vw, 1.1rem);
  line-height: 2;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 1px 14px rgba(var(--night), 0.7);
}

/* 玻璃片按钮：压在画上，不发光 */
.btn {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 26px 14px;
  text-decoration: none;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #fff;
  font-size: 1.02rem;
  letter-spacing: 0.14em;
  transition: background 180ms, border-color 180ms, transform 160ms;
}
.btn span {
  font-family: var(--ui);
  font-size: 0.68rem; letter-spacing: 0.16em;
  color: rgba(255, 255, 255, 0.72);
}
.btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: #fff;
  transform: translateY(-1px);
}
.btn:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }

/* 前言入口：压在图上的次级链接，不加按钮、不加底板 */
.hero__pre {
  display: block;
  width: fit-content;
  margin-top: 18px;
  font-family: var(--ui);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.86);
  text-decoration: none;
  text-shadow: 0 1px 12px rgba(var(--night), 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.34);
  padding-bottom: 3px;
  transition: color 200ms ease, border-color 200ms ease;
}
.hero__pre:hover { color: #fff; border-bottom-color: #fff; }
.hero__pre:focus-visible { outline: 2px solid #fff; outline-offset: 4px; }


/* ---------- 二、纸色内容区 ---------- */
.sheet {
  padding-top: clamp(44px, 7vh, 80px);
}

.doors {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 1.6vw, 22px);
  padding: 0 clamp(24px, 5vw, 64px) clamp(40px, 6vh, 72px);
  max-width: 1180px;
}
.door {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 26px 24px 24px;
  text-decoration: none;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(255, 253, 247, 0.92), rgba(246, 238, 224, 0.7));
  border: 1px solid var(--line);
  border-radius: 3px;
  transition: border-color 200ms, transform 200ms, background 200ms;
}
.door::after {
  content: "";
  position: absolute;
  right: 0; bottom: 0;
  width: 22px; height: 22px;
  background: linear-gradient(315deg, rgba(36, 30, 26, 0.09) 0 50%, transparent 50%);
}
.door:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
  background: linear-gradient(180deg, #fffdf8, rgba(248, 240, 226, 0.9));
}
.door:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
.door__no {
  font-family: var(--ui);
  font-size: 0.7rem; letter-spacing: 0.2em;
  color: #8a5a22;
}
.door:hover .door__no, .door:focus-visible .door__no { color: var(--amber-lit); }
.door__name { font-size: clamp(1.14rem, 1.7vw, 1.34rem); letter-spacing: 0.16em; }
.door__note {
  font-family: var(--ui);
  font-size: 0.74rem; letter-spacing: 0.1em;
  color: var(--muted);
}
.door--soon .door__name { color: var(--ink-2); }
.door--soon .door__note::before {
  content: "";
  display: inline-block;
  width: 5px; height: 5px;
  margin-right: 7px;
  border-radius: 50%;
  background: var(--amber);
  opacity: 0.7;
  vertical-align: 1.5px;
}

.updates {
  padding: 0 clamp(24px, 5vw, 64px) clamp(56px, 9vh, 104px);
  max-width: 1180px;
}
.updates__h {
  margin: 0 0 14px;
  font-family: var(--ui);
  font-size: 0.74rem; font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--muted);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.updates__empty {
  margin: 18px 0 0;
  font-size: 0.92rem; line-height: 1.9;
  color: var(--muted);
}

.updates__item {
  display: grid;
  grid-template-columns: 5.4rem minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  transition: color 180ms ease;
}
.updates__item:first-of-type { border-top: 0; }
.updates__item:hover { color: var(--amber); }
.updates__no {
  font-family: var(--ui);
  font-size: 0.72rem; letter-spacing: 0.14em;
  color: var(--muted);
}
.updates__t { font-size: 1rem; letter-spacing: 0.02em; }
.updates__d {
  font-family: var(--ui);
  font-size: 0.72rem; letter-spacing: 0.08em;
  color: var(--muted);
}

.foot {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 24px clamp(24px, 5vw, 64px) 34px;
  border-top: 1px solid var(--line);
  font-family: var(--ui);
  font-size: 0.7rem; letter-spacing: 0.24em;
  color: var(--muted);
}
.foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--amber); }
.foot__dot { opacity: 0.5; }

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .updates__item { grid-template-columns: minmax(0, 1fr) auto; gap: 10px; }
  .updates__no { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .hero { min-height: 84vh; }
  .hero__bg img { object-position: center 26%; }
  .hero::before {
    background:
      linear-gradient(180deg,
        rgba(var(--night), 0.62) 0%,
        rgba(var(--night), 0.12) 20%,
        rgba(var(--night), 0.10) 44%,
        rgba(var(--night), 0.72) 78%,
        rgba(var(--night), 0.88) 100%);
  }
  .hero__text { padding-bottom: clamp(52px, 9vh, 84px); }
  .doors { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  .doors { grid-template-columns: 1fr; }
  .top { flex-direction: column; align-items: flex-start; gap: 12px; }
  .top__nav { gap: 16px; padding-right: 10px; }
  .top__nav a { font-size: 0.82rem; letter-spacing: 0.06em; }
  .hero__title { letter-spacing: 0.06em; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 1ms !important; }
}

/* ---------- 九、系统深色（跟随 OS，不改 HTML） ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1a1512;
    --paper-2: #241c17;
    --ink: #efe7da;
    --ink-2: #cfc4b5;
    --muted: #9a8e80;
    --line: rgba(240, 231, 218, 0.13);
    --line-strong: rgba(240, 231, 218, 0.26);
    --amber: #e0a95a;
    --amber-lit: #ffd9a0;
    --night: 6, 9, 14;
  }
  body { background: radial-gradient(120% 90% at 50% -10%, #221a15 0%, var(--paper) 46%, var(--paper-2) 100%); }
  .door { background: linear-gradient(180deg, rgba(40, 32, 26, 0.92), rgba(28, 22, 18, 0.72)); }
  .door__no { color: var(--amber); }
}

/* ---------- 十、微动效（全部只动 transform / opacity / 描边） ---------- */
/* 导航：下划线从左生长 */
.top__nav a { position: relative; }
.top__nav a::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -7px;
  height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: left center;
  transition: transform 220ms var(--ease, cubic-bezier(.2,.7,.2,1));
}
.top__nav a:hover::after,
.top__nav a:focus-visible::after,
.top__nav a[aria-current="page"]::after { transform: scaleX(1); }

/* 入口卡：悬停时顶边透出一道光（呼应"门缝"），不发光、不加阴影 */
.door::before {
  content: "";
  position: absolute; left: 12%; right: 12%; top: -1px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  opacity: 0; transition: opacity 240ms;
}
.door:hover::before, .door:focus-visible::before { opacity: .85; }
.door:hover { transform: translateY(-2px); }

/* 页面进入：一层极短的淡入（不做位移，避免 CLS） */
@keyframes sheetIn { from { opacity: 0 } to { opacity: 1 } }
.sheet { animation: sheetIn 420ms ease-out both; }

/* 回到顶部（只在小屏出现，JS 控制显隐） */
.to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 30;
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: 15px; text-decoration: none;
  color: var(--ink); background: var(--paper-2);
  border: 1px solid var(--line-strong);
  opacity: 0; pointer-events: none; transform: translateY(6px);
  transition: opacity 200ms, transform 200ms;
}
.to-top.is-on { opacity: .92; pointer-events: auto; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .door, .door::before, .top__nav a::after, .to-top, .sheet { transition: none !important; animation: none !important; }
}

/* ---------- 首页「继续读」 ---------- */
.resume {
  display: flex;
  align-items: baseline;
  gap: 0.5rem 1rem;
  flex-wrap: wrap;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 1.1rem 1.4rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 200ms, background 200ms;
}
.resume[hidden] { display: none; }
.resume:hover { background: rgba(255, 255, 255, 0.55); border-color: var(--amber); }
.resume__k {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--amber);
}
.resume__t { color: var(--ink-2); }
.resume__go {
  margin-left: auto;
  font-family: var(--font-ui);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.resume:hover .resume__go { color: var(--amber); }

/* ---------- 首访门（猫那一屏，作为覆盖层） ---------- */
.gate {
  position: fixed;
  inset: 0;
  z-index: 200;
  cursor: pointer;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0) 74%, rgba(255, 255, 255, 0.42) 92%, rgba(255, 255, 255, 0.60) 100%),
    linear-gradient(102deg, rgba(10, 26, 42, 0.34) 0%, rgba(10, 26, 42, 0.20) 26%, rgba(10, 26, 42, 0) 56%),
    #cfe6f2 url("/new/assets/art/enter-1280.jpg") center 46% / cover no-repeat;
  opacity: 1;
  transition: opacity 500ms ease, transform 520ms ease;
}
.gate[hidden] { display: none; }
.gate.is-out { opacity: 0; transform: scale(1.06); pointer-events: none; }
html.is-gated, html.is-gated body { overflow: hidden; }
.gate__inner {
  position: absolute;
  left: clamp(20px, 6vw, 86px);
  top: clamp(52px, 16vh, 150px);
}
.gate__kicker {
  margin: 0 0 0.7rem;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  letter-spacing: 0.34em;
  color: #f2f6f8;
  text-shadow: 0 1px 6px rgba(20, 40, 56, 0.45);
}
.gate__kicker em { font-style: normal; color: #ffe9c6; }
.gate__en {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.5em;
  color: #ffe9c6;
  text-shadow: 0 1px 6px rgba(20, 40, 56, 0.45);
}
.gate__cn {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  letter-spacing: 0.1em;
  line-height: 1.1;
  color: #fffdf6;
  text-shadow: 0 3px 26px rgba(12, 32, 48, 0.5), 0 1px 8px rgba(12, 32, 48, 0.35);
}
.gate__cn em {
  font-style: normal;
  text-shadow: none;
  filter: drop-shadow(0 3px 18px rgba(12, 32, 48, 0.45));
  background: linear-gradient(180deg, #fffdf6, #fff8ea 52%, #ffefd2);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.gate__hint {
  position: absolute;
  left: 0; right: 0;
  bottom: clamp(22px, 5vh, 46px);
  margin: 0;
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.74rem;
  letter-spacing: 0.3em;
  color: #22333b;
  text-shadow: 0 0 2px rgba(255, 255, 255, 0.95), 0 0 8px rgba(255, 255, 255, 0.9);
}
.gate__hint em { font-style: normal; opacity: 0.8; }
@media (max-width: 640px) {
  .gate { background-position: 81% 46%; }
  .gate__inner { left: 22px; top: 12vh; }
}