/* ============================================================
   络新妇 · Jorōgumo — 纯前端静态页面样式
   ============================================================ */

:root {
  --bg: #0a0806;
  --bg-2: #120d0a;
  --ink: #e9e0cf;          /* 暖纸白 */
  --ink-dim: #a09382;
  --crimson: #b31e1e;
  --crimson-bright: #e0342a;
  --gold: #c9a15a;
  --paper: #efe6d4;
  --web: rgba(205, 185, 160, 0.07);
  --serif: "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --brush: "STKaiti", "Kaiti SC", "KaiTi", "DFKai-SB", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 背景层 ---------- */
.bg-web {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  color: var(--web);
}
.web { position: absolute; }
.web-tl { top: 0; left: 0; width: min(46vmin, 520px); height: auto; }
.web-br { bottom: 0; right: 0; width: min(44vmin, 480px); height: auto; }

#particles {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* ---------- 蜘蛛 ---------- */
.spider-wrap {
  position: fixed;
  top: 0;
  right: 16%;
  z-index: 2;
  color: #cbb;
  opacity: 0.85;
  transform-origin: top center;
  animation: sway 9s ease-in-out infinite;
  pointer-events: none;
}
.spider-thread {
  width: 1px;
  height: 9vh;
  min-height: 56px;
  margin: 0 auto;
  background: linear-gradient(to bottom, transparent, rgba(203, 187, 187, 0.55));
}
.spider-svg {
  width: 46px;
  height: auto;
  display: block;
  margin: 0 auto;
}
@keyframes sway {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(6deg); }
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(18px, 4vw, 48px);
  background: linear-gradient(to bottom, rgba(10, 8, 6, 0.85), transparent);
  backdrop-filter: blur(4px);
}
.nav-brand {
  font-family: var(--brush);
  font-size: 1.5rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.06em;
}
.nav-links { display: flex; gap: clamp(14px, 3vw, 30px); }
.nav-links a {
  color: var(--ink-dim);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  transition: color 0.3s;
}
.nav-links a:hover { color: var(--crimson-bright); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  z-index: 3;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 96px 24px 72px;
}
.hero-kana {
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.5em;
  color: var(--ink-dim);
  writing-mode: vertical-rl;
  position: absolute;
  right: clamp(10px, 5vw, 60px);
  top: 50%;
  transform: translateY(-50%);
}
.hero-title {
  font-family: var(--brush);
  font-size: clamp(4rem, 16vw, 11rem);
  font-weight: 400;
  line-height: 1;
  color: var(--ink);
  text-shadow: 0 0 60px rgba(179, 30, 30, 0.25);
  animation: heroIn 1.4s ease both;
}
.hero-sub {
  margin-top: 0.8em;
  font-size: clamp(1rem, 3vw, 1.4rem);
  letter-spacing: 0.35em;
  color: var(--crimson-bright);
  animation: heroIn 1.4s 0.25s ease both;
}
.hero-en {
  margin-top: 0.7em;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-dim);
  animation: heroIn 1.4s 0.4s ease both;
}
@keyframes heroIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.scroll-hint {
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--ink-dim);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  animation: bob 2.4s ease-in-out infinite;
}
.scroll-arrow { font-size: 0.9rem; }
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ---------- 通用 section ---------- */
.section {
  position: relative;
  z-index: 3;
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(72px, 12vh, 140px) clamp(22px, 6vw, 40px);
}
.section-head { margin-bottom: clamp(28px, 6vh, 56px); }
.section-index {
  font-family: var(--brush);
  font-size: 2.2rem;
  color: var(--crimson);
  margin-right: 0.4em;
}
.section-title {
  display: inline-block;
  font-family: var(--brush);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--ink);
}
.section-note {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 4px;
}

/* ---------- 传说 ---------- */
.lore { text-align: left; }
.lore-body { max-width: 34em; }
.lore-text { font-size: clamp(1rem, 2.4vw, 1.18rem); color: #d8cebc; text-indent: 2em; }
.lore-text-2 { margin-top: 1.4em; }
.lore-text em { color: var(--crimson-bright); font-style: normal; }
.lore-vertical {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--brush);
  font-size: clamp(5rem, 16vw, 11rem);
  color: rgba(179, 30, 30, 0.14);
  writing-mode: vertical-rl;
  pointer-events: none;
}

/* ---------- 阅后即焚 ---------- */
.burn { text-align: center; }
.burn-intro {
  max-width: 40em;
  margin: 0 auto 40px;
  color: var(--ink-dim);
  font-size: 0.98rem;
}
.burn-intro .dim { color: #6f6657; font-size: 0.8rem; }
.pc { display: none; }

.burn-composer {
  max-width: 520px;
  margin: 0 auto;
  transition: opacity 0.5s, transform 0.5s;
}
.burn-composer.hidden { opacity: 0; pointer-events: none; transform: translateY(10px); }

#secretInput {
  width: 100%;
  resize: vertical;
  min-height: 150px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(233, 224, 207, 0.16);
  border-radius: 6px;
  padding: 18px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.9;
  outline: none;
  transition: border-color 0.3s, background 0.3s;
}
#secretInput:focus { border-color: rgba(179, 30, 30, 0.6); background: rgba(255, 255, 255, 0.05); }
#secretInput::placeholder { color: #6f6657; }
#secretInput.shake { animation: shake 0.45s; border-color: var(--crimson-bright); }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-7px); }
  40%, 80% { transform: translateX(7px); }
}

.composer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}
.char-count { font-family: var(--sans); font-size: 0.78rem; color: #6f6657; }

.btn {
  cursor: pointer;
  font-family: var(--serif);
  letter-spacing: 0.2em;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: all 0.3s;
}
.btn-seal {
  padding: 10px 34px;
  background: var(--crimson);
  color: #f5ecd8;
  font-size: 0.95rem;
}
.btn-seal:hover { background: var(--crimson-bright); box-shadow: 0 0 24px rgba(224, 52, 42, 0.4); }
.btn-ghost {
  padding: 10px 30px;
  background: transparent;
  color: var(--ink-dim);
  border-color: rgba(233, 224, 207, 0.3);
  font-size: 0.9rem;
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink); }

/* 信纸 */
.paper {
  position: relative;
  width: min(400px, 88vw);
  aspect-ratio: 3 / 4;
  margin: 12px auto 0;
  background:
    radial-gradient(circle at 80% 12%, rgba(179,30,30,0.05), transparent 40%),
    linear-gradient(160deg, #f1e8d5, #e2d3ba);
  color: #2a1f16;
  border-radius: 5px;
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.55);
  transition: transform 0.8s, filter 1.4s, opacity 0.6s;
  overflow: hidden;
  cursor: pointer;
}
.paper.reading { cursor: default; }
.paper.burning { transform: translateY(14px) scale(0.9); filter: brightness(0.45); }

.paper-sealed, .paper-read {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px;
}
.paper-seal {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  background: var(--crimson);
  color: #f5ecd8;
  font-family: var(--brush);
  font-size: 2rem;
  border-radius: 6px;
  transform: rotate(-6deg);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}
.paper-hint {
  margin-top: 22px;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: #7a6a52;
}
.paper-web {
  position: absolute;
  width: 120px; height: 120px;
  top: 8px; left: 8px;
  background: repeating-conic-gradient(rgba(122,106,82,0.12) 0 8deg, transparent 8deg 18deg);
  border-radius: 50%;
  -webkit-mask: radial-gradient(circle, transparent 40%, #000 41%, #000 70%, transparent 71%);
  mask: radial-gradient(circle, transparent 40%, #000 41%, #000 70%, transparent 71%);
  opacity: 0.5;
}

.paper-read { text-align: left; justify-content: flex-start; padding-top: 44px; }
.paper-text {
  width: 100%;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 1.05rem;
  line-height: 2;
  color: #2a1f16;
}
.burn-countdown {
  margin-top: auto;
  align-self: flex-end;
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--crimson);
  letter-spacing: 0.1em;
}
.burn-countdown span { font-size: 1.6rem; font-weight: 600; animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

/* 燃烧效果 */
.paper-char {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.92), rgba(0,0,0,0.35) 45%, transparent);
  opacity: 0;
  transition: opacity 1.6s ease;
  pointer-events: none;
}
.paper.burning .paper-char { opacity: 1; }

.paper-fire {
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 150px;
  height: 90px;
  opacity: 0;
  pointer-events: none;
}
.paper.burning .paper-fire { opacity: 1; }
.flame {
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 34px; height: 66px;
  background: radial-gradient(ellipse at bottom, #ffd27a 0%, #ff8b3c 42%, #e0342a 72%, transparent 100%);
  border-radius: 50% 50% 22% 22%;
  filter: blur(2px);
  animation: flick 0.32s ease-in-out infinite alternate;
}
.flame-2 { left: 26%; height: 48px; animation-delay: 0.1s; }
.flame-3 { left: 74%; height: 54px; animation-delay: 0.2s; }
@keyframes flick {
  from { transform: translateX(-50%) translateY(0) scaleY(1) scaleX(1); opacity: 0.92; }
  to { transform: translateX(-50%) translateY(-9px) scaleY(1.22) scaleX(0.88); opacity: 0.65; }
}

/* 余烬粒子 */
.ember {
  position: fixed;
  width: var(--s, 3px);
  height: var(--s, 3px);
  border-radius: 50%;
  background: radial-gradient(circle, #ffe0a0, #ff7a3c 55%, transparent);
  pointer-events: none;
  z-index: 60;
  filter: blur(0.5px);
  animation: emberRise var(--d, 1.6s) ease-out forwards;
}
@keyframes emberRise {
  0% { transform: translate(0, 0) scale(1); opacity: 1; }
  100% { transform: translate(var(--dx, 0), var(--dy, -170px)) scale(0.08); opacity: 0; }
}

.burn-ash {
  margin-top: 34px;
  color: var(--ink-dim);
  font-size: 0.95rem;
  letter-spacing: 0.3em;
}
.burn-rewrite { margin-top: 26px; }

/* ---------- 撒由那拉 ---------- */
.sayonara { text-align: center; }
.sayonara-line {
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  letter-spacing: 0.16em;
  color: #d8cebc;
  margin-bottom: 0.5em;
}
.btn-sayonara {
  margin-top: 34px;
  padding: 13px 44px;
  background: transparent;
  color: var(--crimson-bright);
  border-color: rgba(224, 52, 42, 0.5);
  font-size: 1rem;
}
.btn-sayonara:hover {
  background: rgba(224, 52, 42, 0.12);
  box-shadow: 0 0 28px rgba(224, 52, 42, 0.3);
  color: #ff6b5e;
}

/* ---------- 页脚 ---------- */
.footer {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 60px 20px 48px;
  border-top: 1px solid rgba(233, 224, 207, 0.08);
  color: var(--ink-dim);
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
}
.footer-small { margin-top: 8px; font-size: 0.72rem; color: #6f6657; }

/* ---------- 告别幕 ---------- */
.farewell {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: radial-gradient(circle at 50% 40%, #1a0d0b, #070505 70%);
  opacity: 0;
  visibility: hidden;
  transition: opacity 1s, visibility 1s;
  overflow: hidden;
}
.farewell.open { opacity: 1; visibility: visible; }
.farewell-kana {
  font-family: var(--sans);
  font-size: 0.9rem;
  letter-spacing: 0.5em;
  color: var(--ink-dim);
  margin-bottom: 22px;
}
.farewell-word {
  font-family: var(--brush);
  font-size: clamp(3rem, 14vw, 9rem);
  color: var(--crimson-bright);
  line-height: 1.1;
  letter-spacing: 0.08em;
  cursor: pointer;
  text-shadow: 0 0 50px rgba(224, 52, 42, 0.4);
}
.farewell-line {
  margin-top: 26px;
  color: var(--ink-dim);
  letter-spacing: 0.2em;
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
}
.btn-return {
  margin-top: 46px;
  padding: 11px 40px;
  background: transparent;
  color: var(--ink);
  border-color: rgba(233, 224, 207, 0.35);
  opacity: 0;
  animation: fadeIn 0.8s 2.6s forwards;
}
.btn-return:hover { border-color: var(--ink); background: rgba(255,255,255,0.06); }
@keyframes fadeIn { to { opacity: 1; } }

/* 花瓣 */
.petal {
  position: absolute;
  top: -30px;
  width: var(--s, 10px);
  height: calc(var(--s, 10px) * 0.72);
  background: linear-gradient(135deg, #ffb6c1, var(--crimson-bright));
  border-radius: 82% 4% 82% 4%;
  opacity: 0.85;
  pointer-events: none;
  z-index: 4;
  animation: petalFall var(--d, 7s) linear forwards;
}
@keyframes petalFall {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(var(--dx, 40px), 108vh) rotate(var(--rot, 360deg)); }
}

/* ---------- 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* 无障碍隐藏文本 */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .pc { display: inline; }
  .hero-kana { right: clamp(24px, 8vw, 120px); }
}

@media (max-width: 480px) {
  .nav-links a { font-size: 0.78rem; letter-spacing: 0.06em; }
  .hero-kana { display: none; }
  .lore-vertical { font-size: 4rem; right: 6px; opacity: 0.5; }
  .spider-wrap { right: 8%; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}