/* ============================================================
   锈湖（Rusty Lake / Cube Escape）风格主题（移动端优先）
   设计动机：把界面基调从浪漫粉色改为锈湖系列的阴郁超现实风。
   - 配色：深湖蓝绿→近黑背景 + 做旧烛光琥珀高光 + 暗血红点缀 + 羊皮纸米色文字
   - 质感：颗粒噪点(film grain) + 暗角(vignette)，营造老旧胶片/仪式感
   - 符号：等距立方体（记忆魔方）作加载符号，水中上浮微尘作背景
   遵守可访问性：足够对比度、可见焦点、尊重 prefers-reduced-motion。
   ============================================================ */

:root {
  /* 背景：深湖到近黑 */
  --bg-void: #0c1513;   /* 近黑湖底 */
  --bg-deep: #122019;   /* 深湖绿 */
  --bg-teal: #1a2e28;   /* 湖水 */

  /* 文字：羊皮纸米色 */
  --parchment: #ded3bd;
  --parchment-dim: #9c9079; /* 次要文字（对深底满足 4.5:1） */

  /* 高光：做旧烛光琥珀 + 暗血红 */
  --amber: #c8862f;
  --amber-bright: #e3a64d;
  --blood: #9a3f37;

  /* 框线 */
  --frame: #3a4f47;
  --frame-soft: #2a3d36;

  --radius: 4px; /* 锈湖偏硬朗，圆角很小 */
  --shadow-card: 0 22px 60px rgba(0, 0, 0, 0.55);
  --glow-amber: 0 0 18px rgba(200, 134, 47, 0.35);

  --font-cn: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --font-display: "Cinzel", "Cormorant Garamond", serif;
  --font-serif: "Cormorant Garamond", var(--font-cn);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-cn);
  color: var(--parchment);
  background:
    radial-gradient(120% 90% at 50% 8%, var(--bg-teal) 0%, var(--bg-deep) 42%, var(--bg-void) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* ---------- 屏幕状态机：同一时刻只显示一个屏幕 ---------- */
#app {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  min-height: 100dvh;
}

.screen {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 28px;
  opacity: 0;
  transition: opacity 520ms ease;
}

.screen.is-active {
  display: flex;
  opacity: 1;
}

/* ---------- ① 加载屏 ---------- */
.loading-tap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  border: none;
  background: transparent;
  color: var(--amber);
  cursor: pointer;
  text-align: center;
  padding: 24px;
}

.cube-loader {
  color: var(--amber-bright);
  filter: drop-shadow(0 0 14px rgba(200, 134, 47, 0.45));
  animation: cube-breathe 4.2s ease-in-out infinite, candle 3.1s ease-in-out infinite;
}

.loading-title {
  font-family: var(--font-cn);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 8px;
  color: var(--parchment);
}

.loading-hint {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--parchment-dim);
  animation: breathe 2.6s ease-in-out infinite;
}

/* ---------- ② 开场屏 / 结局 / 主屏 容器 ---------- */
.intro-inner,
.ending-inner,
.main-inner {
  width: 100%;
  max-width: 420px;
  text-align: center;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 8px;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 14px;
  line-height: 1;
}

.display-title {
  font-family: var(--font-cn);
  font-size: 38px;
  font-weight: 600;
  letter-spacing: 12px;
  color: var(--parchment);
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.5);
  margin: 0 0 20px;
}

.intro-sub {
  font-size: 15px;
  line-height: 2;
  color: var(--parchment-dim);
  margin: 0 0 44px;
  letter-spacing: 2px;
}

/* ---------- ③ 主屏 ---------- */
.main-prompt {
  font-size: 18px;
  font-weight: 600;
  color: var(--parchment);
  letter-spacing: 4px;
  margin: 0 0 24px;
}

.clue-input {
  width: 100%;
  padding: 16px 20px;
  font-size: 17px;
  font-family: var(--font-cn);
  color: var(--parchment);
  background: rgba(8, 16, 14, 0.6);
  border: 1px solid var(--frame);
  border-radius: var(--radius);
  outline: none;
  letter-spacing: 2px;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
  transition: border-color 220ms ease, box-shadow 220ms ease;
}

.clue-input::placeholder {
  color: #6f6a5c;
  letter-spacing: 1px;
}

.clue-input:focus {
  border-color: var(--amber);
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5), 0 0 0 2px rgba(200, 134, 47, 0.25);
}

.main-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.btn-block {
  display: block;
  width: 100%;
}

/* 通用隐藏：用 :not(.overlay) 避免覆盖用 opacity 过渡的对话框遮罩 */
.hidden:not(.overlay) {
  display: none !important;
}

/* 主界面提示下方的小字 */
.main-subhint {
  font-size: 13px;
  line-height: 1.8;
  color: var(--parchment-dim);
  letter-spacing: 0.5px;
  margin: -10px 0 22px;
}

.main-subhint strong {
  color: var(--amber-bright);
  font-weight: 600;
}

.main-progress {
  margin-top: 28px;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--parchment-dim);
  min-height: 18px;
}

/* ---------- 按钮 ---------- */
.btn {
  font-family: var(--font-cn);
  font-size: 16px;
  letter-spacing: 4px;
  padding: 14px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--frame);
  cursor: pointer;
  background: var(--bg-deep);
  color: var(--parchment);
  transition: background 220ms ease, color 220ms ease, box-shadow 220ms ease, border-color 220ms ease, transform 80ms ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  color: #0c1513;
  background: linear-gradient(180deg, var(--amber-bright) 0%, var(--amber) 100%);
  border-color: var(--amber);
  box-shadow: var(--glow-amber);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #efb45e 0%, #d4922f 100%);
  box-shadow: 0 0 26px rgba(200, 134, 47, 0.5);
}

.btn-ghost {
  color: var(--parchment);
  background: rgba(8, 16, 14, 0.5);
  border-color: var(--frame);
}

.btn-ghost:hover {
  color: var(--amber-bright);
  border-color: var(--amber);
  box-shadow: var(--glow-amber);
}

.btn:focus-visible {
  outline: 2px solid var(--amber-bright);
  outline-offset: 3px;
}

/* ---------- 对话框浮层 ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(4, 9, 8, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: opacity 280ms ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.dialog-card {
  width: 100%;
  max-width: 380px;
  max-height: 82vh;
  overflow-y: auto;
  background:
    linear-gradient(180deg, var(--bg-teal) 0%, var(--bg-deep) 100%);
  border: 1px solid var(--frame);
  /* 双层描边，像锈湖里的旧框 */
  box-shadow: 0 0 0 1px rgba(222, 211, 189, 0.08), inset 0 0 0 1px rgba(222, 211, 189, 0.06), var(--shadow-card);
  border-radius: var(--radius);
  padding: 30px 26px;
  text-align: center;
  transform: translateY(0) scale(1);
  transition: transform 300ms cubic-bezier(0.22, 1, 0.36, 1);
}

.overlay.hidden .dialog-card {
  transform: translateY(14px) scale(0.97);
}

.dialog-title {
  font-size: 21px;
  font-weight: 600;
  color: var(--amber-bright);
  letter-spacing: 4px;
  margin: 0 0 18px;
}

.dialog-body {
  font-size: 16px;
  line-height: 2;
  color: var(--parchment);
  letter-spacing: 1px;
}

.dialog-body img {
  display: block;
  width: 80%;
  max-width: 240px;
  margin: 18px auto 6px;
  border-radius: var(--radius);
  border: 1px solid var(--frame);
  box-shadow: 0 0 0 6px rgba(222, 211, 189, 0.06), var(--shadow-card);
}

.dialog-qr-hint {
  margin-top: 10px;
  font-size: 13px;
  color: var(--parchment-dim);
  letter-spacing: 1px;
}

.dialog-actions {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dialog-actions .btn {
  width: 100%;
}

/* ---------- ④ 结局屏 ---------- */
#screen-ending {
  align-items: flex-start;
  overflow-y: auto;
}

.ending-inner {
  padding: 52px 0 64px;
}

.ending-final {
  font-size: 16px;
  line-height: 2.1;
  color: var(--parchment);
  letter-spacing: 1.5px;
  margin: 0 0 48px;
}

.ending-rules-heading {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--amber);
  margin: 0 0 20px;
}

.rules-list {
  text-align: left;
  display: grid;
  gap: 14px;
}

.rule-item {
  background: rgba(8, 16, 14, 0.55);
  border: 1px solid var(--frame-soft);
  border-left: 2px solid var(--amber);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.rule-keys {
  font-size: 14px;
  font-weight: 600;
  color: var(--amber-bright);
  margin: 0 0 6px;
  letter-spacing: 2px;
}

.rule-desc {
  font-size: 14px;
  line-height: 1.9;
  color: var(--parchment-dim);
  margin: 0;
  letter-spacing: 0.5px;
}

.rule-item img {
  display: block;
  width: 60%;
  max-width: 180px;
  margin: 12px auto 2px;
  border-radius: var(--radius);
  border: 1px solid var(--frame);
}

.rule-badge {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--blood);
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 1px 8px;
  margin-left: 6px;
  vertical-align: middle;
}

/* ---------- 氛围层：暗角 / 颗粒噪点 / 水中微尘 ---------- */
.vignette {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: radial-gradient(120% 100% at 50% 40%, transparent 52%, rgba(0, 0, 0, 0.55) 100%);
}

.grain {
  position: fixed;
  inset: -50%;
  z-index: 4;
  pointer-events: none;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 1.2s steps(3) infinite;
}

.motes {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.motes span {
  position: absolute;
  bottom: -20px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(227, 166, 77, 0.5), rgba(227, 166, 77, 0));
  animation: rise linear infinite;
}

.motes span:nth-child(1) { left: 10%; animation-duration: 16s; animation-delay: 0s; }
.motes span:nth-child(2) { left: 28%; animation-duration: 22s; animation-delay: 4s; transform: scale(0.7); }
.motes span:nth-child(3) { left: 46%; animation-duration: 19s; animation-delay: 8s; transform: scale(1.3); }
.motes span:nth-child(4) { left: 64%; animation-duration: 24s; animation-delay: 2s; }
.motes span:nth-child(5) { left: 80%; animation-duration: 18s; animation-delay: 6s; transform: scale(0.9); }
.motes span:nth-child(6) { left: 92%; animation-duration: 21s; animation-delay: 10s; }

/* ---------- 动画 ---------- */
@keyframes cube-breathe {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-6px) rotate(4deg); }
}

@keyframes candle {
  0%, 100% { opacity: 1; filter: drop-shadow(0 0 14px rgba(200, 134, 47, 0.45)); }
  45% { opacity: 0.82; filter: drop-shadow(0 0 8px rgba(200, 134, 47, 0.28)); }
  70% { opacity: 0.95; }
}

@keyframes breathe {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.95; }
}

@keyframes rise {
  0% { transform: translateY(0) scale(1); opacity: 0; }
  12% { opacity: 0.8; }
  100% { transform: translateY(-112vh) scale(1.1); opacity: 0; }
}

@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  33% { transform: translate(-6%, 4%); }
  66% { transform: translate(4%, -5%); }
  100% { transform: translate(0, 0); }
}

/* 输入框轻微抖动：空输入或未命中时的轻提示 */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.shake {
  animation: shake 360ms ease;
}

/* ---------- 尊重减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .motes,
  .grain { display: none; }
}

/* ---------- 新增页面：寻求帮助 / 提前解锁 / 张家瑜 / 已通关 ---------- */
.help-inner,
.early-inner {
  width: 100%;
  max-width: 420px;
  text-align: center;
}

/* 较小的标题（用于多字标题页） */
.display-sm {
  font-size: 26px;
  letter-spacing: 6px;
}

/* 帮助页：剩余讯号 */
.help-signals {
  font-size: 15px;
  letter-spacing: 2px;
  color: var(--parchment-dim);
  margin: 0 0 22px;
}

.signal-num {
  color: var(--amber-bright);
  font-weight: 600;
  font-size: 18px;
}

/* 提前解锁页 */
.early-prompt {
  font-size: 14px;
  line-height: 2;
  color: var(--parchment-dim);
  letter-spacing: 1px;
  margin: 0 0 24px;
  text-align: left;
}

.early-feedback {
  min-height: 22px;
  margin: 16px 0;
  font-size: 14px;
  line-height: 1.9;
  letter-spacing: 1px;
  color: var(--amber-bright);
}

#screen-early { align-items: flex-start; overflow-y: auto; }
.early-inner { padding: 48px 0 56px; }

/* 张家瑜页：仅三行字，居中、极简 */
.zjy-inner {
  width: 100%;
  max-width: 420px;
  text-align: center;
  display: grid;
  gap: 26px;
}

.zjy-line {
  margin: 0;
  color: var(--parchment);
  letter-spacing: 4px;
}

.zjy-line.zjy-en {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: 10px;
  text-transform: uppercase;
  color: var(--amber);
}

.zjy-line.zjy-blank {
  font-size: 22px;
}

.zjy-line.zjy-num {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 6px;
  color: var(--parchment-dim);
}

/* 九键键盘图标（点满 10 次后显示） */
.zjy-keypad {
  margin-top: 8px;
  display: flex;
  justify-content: center;
}

.zjy-keypad-svg {
  width: 88px;
  height: 88px;
  color: var(--amber-bright);
  filter: drop-shadow(0 0 12px rgba(200, 134, 47, 0.35));
}

/* 已通关页 */
#screen-cleared { align-items: flex-start; overflow-y: auto; }

.cleared-inner {
  width: 100%;
  max-width: 420px;
  text-align: center;
  padding: 52px 0 64px;
}

.cleared-sub {
  font-size: 15px;
  line-height: 1.9;
  color: var(--parchment-dim);
  letter-spacing: 1px;
  margin: 0 0 30px;
}

.gift-reveal {
  background: rgba(200, 134, 47, 0.1);
  border: 1px solid var(--amber);
  border-radius: var(--radius);
  padding: 20px 18px;
  margin: 0 0 30px;
  box-shadow: var(--glow-amber);
}

.gift-reveal .gift-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--amber-bright);
  margin: 0 0 10px;
}

.gift-reveal .gift-content {
  font-size: 14px;
  line-height: 1.9;
  color: var(--parchment);
  margin: 0;
}

.gift-reveal img {
  display: block;
  width: 70%;
  max-width: 220px;
  margin: 14px auto 0;
  border-radius: var(--radius);
  border: 1px solid var(--frame);
}

/* 对话框正文：两端对齐 + 首行缩进 2 字符（每个 [换行] 段落独立缩进） */
.dialog-body p {
  margin: 0 0 8px;
  text-align: justify;
  text-indent: 2em;
}

.dialog-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 大屏适当收窄 ---------- */
@media (min-width: 768px) {
  .display-title { font-size: 44px; }
  .display-sm { font-size: 30px; }
}