/* ============ 《时间的尽头》视觉系统 ============ */
:root {
  --bg: #05030c;
  --ink: #f2ead8;
  --ink-dim: rgba(242, 234, 216, 0.55);
  --success: #7dffb0;
  --warning: #ffc46b;
  --danger: #ff5a3c;
  --info: #4fd8ff;
  --surface: rgba(15, 9, 27, 0.66);
  --surface-2: rgba(24, 15, 42, 0.6);
  --font-serif: Georgia, "Times New Roman", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Cascadia Code", "SF Mono", Consolas, "Courier New", monospace;
}
body[data-theme="dusk"]    { --accent: #ffb347; --accent2: #4fd8ff; --accent3: #ff4fa3; }
body[data-theme="glacier"] { --accent: #6fc3ff; --accent2: #b39dff; --accent3: #7fffe0; }
body[data-theme="ember"]   { --accent: #ff7a4f; --accent2: #ff4f6d; --accent3: #ffc46b; }
body[data-theme="aurora"]  { --accent: #7dffb0; --accent2: #4fd8c8; --accent3: #b0ff6f; }

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; overflow: hidden; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  user-select: none;
}
::selection { background: color-mix(in srgb, var(--accent) 40%, transparent); }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

#app { position: fixed; inset: 0; }
#scene { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

/* ============ 顶栏 ============ */
#hud-top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 26px 32px; pointer-events: none;
}
.brand { pointer-events: none; }
.overline {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: 0.32em; color: var(--ink-dim);
  text-transform: uppercase; font-family: var(--font-mono);
}
.dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.brand h1 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: 0.3em; margin: 8px 0 6px; line-height: 1.1;
  background: linear-gradient(105deg, var(--accent) 10%, #fff6e0 52%, var(--accent2) 95%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 2px 14px rgba(0, 0, 0, 0.65)) drop-shadow(0 0 22px color-mix(in srgb, var(--accent) 35%, transparent));
}
.brand .sub {
  font-size: 10px; letter-spacing: 0.58em; color: var(--ink-dim);
  font-family: var(--font-mono);
}
.top-actions { display: flex; gap: 10px; pointer-events: auto; }
.icon-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 13px; border-radius: 10px;
  background: var(--surface); color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  font-size: 12px; letter-spacing: 0.08em;
  transition: border-color .2s, box-shadow .2s, transform .2s, background .2s;
}
.icon-btn:hover {
  border-color: color-mix(in srgb, var(--accent) 65%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--accent) 25%, transparent);
  transform: translateY(-1px);
}
#btn-sound .mute-x { display: none; }
#btn-sound.muted .waves { display: none; }
#btn-sound.muted .mute-x { display: initial; }
#btn-sound.muted { color: var(--ink-dim); }

/* ============ 观测面板 ============ */
#panel {
  position: fixed; z-index: 25; right: 22px; top: 96px; bottom: 118px;
  width: 272px; display: flex; flex-direction: column;
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: 14px;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5),
              inset 0 1px 0 color-mix(in srgb, var(--accent) 18%, transparent);
  overflow: hidden;
  transition: bottom .35s ease, box-shadow .3s;
}
#panel::before {
  content: ""; position: absolute; top: 0; left: 8%; right: 8%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  opacity: 0.7;
}
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 15px 16px 12px; flex: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
}
.panel-head h2 {
  font-family: var(--font-serif); font-size: 16px;
  letter-spacing: 0.3em; color: var(--accent); font-weight: 600;
}
.panel-sub { font-size: 8.5px; letter-spacing: 0.3em; color: var(--ink-dim); font-family: var(--font-mono); }
#panel-toggle {
  background: none; border: none; color: var(--ink-dim);
  padding: 6px; border-radius: 6px; transition: transform .3s, color .2s;
}
#panel-toggle:hover { color: var(--accent); }
#panel.collapsed { bottom: auto; }
#panel.collapsed .panel-body { display: none; }
#panel.collapsed #panel-toggle { transform: rotate(180deg); }

.panel-body {
  overflow-y: auto; padding: 14px 16px 16px; flex: 1;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--accent) 55%, transparent) rgba(255, 255, 255, 0.04);
}
.panel-body::-webkit-scrollbar { width: 6px; }
.panel-body::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.04); border-radius: 3px; }
.panel-body::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--accent) 55%, transparent); border-radius: 3px;
}
.panel-body::-webkit-scrollbar-thumb:hover { background: var(--accent); }

.ctl { margin-bottom: 15px; }
.ctl label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 12px; letter-spacing: 0.12em; color: var(--ink);
  margin-bottom: 7px;
}
.ctl output {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--accent2); letter-spacing: 0;
}
.hint-inline { font-size: 10px; color: var(--ink-dim); margin-left: 6px; letter-spacing: 0.05em; }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 18px; background: transparent; --p: 50%;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px; border-radius: 2px;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--accent) 90%, white 5%) var(--p),
    rgba(255, 255, 255, 0.13) var(--p));
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: 50%; margin-top: -5px;
  background: var(--accent); border: 2px solid #0a0614;
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 70%, transparent);
  transition: transform .15s, box-shadow .15s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.25); box-shadow: 0 0 16px var(--accent); }
input[type="range"]::-moz-range-track { height: 4px; border-radius: 2px; background: rgba(255, 255, 255, 0.13); }
input[type="range"]::-moz-range-progress { height: 4px; border-radius: 2px; background: var(--accent); }
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 2px solid #0a0614;
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 70%, transparent);
}

.time-buttons { display: flex; gap: 6px; margin-top: 8px; }
.time-buttons button {
  flex: 1; padding: 6px 0; font-size: 11px; letter-spacing: 0.05em;
  background: var(--surface-2); color: var(--ink-dim);
  border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 8px;
  transition: all .18s;
}
.time-buttons button:hover { color: var(--ink); border-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.time-buttons button.active {
  color: #0a0614; background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 45%, transparent);
  font-weight: 600;
}

.ctl-row { display: flex; justify-content: space-between; align-items: center; }
.ctl-row label { margin-bottom: 0; flex: 1; }
select {
  appearance: none; -webkit-appearance: none;
  background: var(--surface-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23ffb347' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 10px center;
  color: var(--ink); border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  border-radius: 8px; padding: 7px 28px 7px 10px; font-size: 12px;
  min-width: 128px; transition: border-color .2s;
}
select:hover, select:focus { border-color: var(--accent); }
select option { background: #140d24; color: var(--ink); }

.switch { position: relative; display: inline-block; width: 38px; height: 20px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider-track {
  position: absolute; inset: 0; border-radius: 20px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.14);
  transition: all .2s; cursor: pointer;
}
.slider-track::before {
  content: ""; position: absolute; width: 14px; height: 14px;
  left: 2px; top: 2px; border-radius: 50%;
  background: var(--ink-dim); transition: all .2s;
}
.switch input:checked + .slider-track {
  background: color-mix(in srgb, var(--accent) 40%, transparent);
  border-color: var(--accent);
}
.switch input:checked + .slider-track::before {
  transform: translateX(18px); background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.panel-actions {
  display: flex; gap: 7px; margin-top: 4px; padding-top: 13px;
  border-top: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
}
.panel-actions button {
  flex: 1; padding: 9px 0; font-size: 12px; letter-spacing: 0.1em;
  background: var(--surface-2); color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  border-radius: 9px; transition: all .18s;
}
.panel-actions button:hover {
  border-color: var(--accent); transform: translateY(-1px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 22%, transparent);
}
.panel-actions button.primary {
  background: linear-gradient(120deg, color-mix(in srgb, var(--accent) 85%, white 8%), var(--accent));
  color: #0a0614; font-weight: 600; border-color: transparent;
}
.panel-actions button.primary:hover { box-shadow: 0 4px 22px color-mix(in srgb, var(--accent) 50%, transparent); }

/* ============ 底部读数 ============ */
#hud-bottom {
  position: fixed; left: 32px; bottom: 26px; z-index: 20; pointer-events: none;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.85);
}
.countdown-block { display: flex; flex-direction: column; gap: 4px; }
.countdown-block .label {
  font-size: 9.5px; letter-spacing: 0.34em; color: var(--ink-dim);
  font-family: var(--font-mono);
}
#countdown {
  font-family: var(--font-mono); font-size: clamp(22px, 2.4vw, 30px);
  letter-spacing: 0.08em; color: var(--accent);
  text-shadow: 0 0 24px color-mix(in srgb, var(--accent) 55%, transparent);
  font-variant-numeric: tabular-nums;
}
#countdown.glitching { animation: glitchText .45s steps(2) both; }
@keyframes glitchText {
  0% { transform: translate(0); text-shadow: 2px 0 var(--danger), -2px 0 var(--info); }
  25% { transform: translate(-3px, 1px) skewX(-6deg); text-shadow: -3px 0 var(--danger), 3px 0 var(--info); }
  50% { transform: translate(2px, -1px); text-shadow: 3px 0 var(--accent3), -3px 0 var(--accent2); }
  75% { transform: translate(-1px, 1px) skewX(4deg); }
  100% { transform: translate(0); text-shadow: 0 0 24px color-mix(in srgb, var(--accent) 55%, transparent); }
}
#epoch {
  font-size: 11px; letter-spacing: 0.22em; color: var(--accent2);
  font-family: var(--font-mono);
}
.stats { display: flex; gap: 18px; margin-top: 12px; font-size: 11px; color: var(--ink-dim); letter-spacing: 0.1em; }
.stats b { color: var(--ink); font-family: var(--font-mono); font-weight: 500; margin-left: 4px; }

/* ============ 提示 / 通知 ============ */
#hint {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  z-index: 18; padding: 9px 20px; border-radius: 999px;
  background: var(--surface); font-size: 11.5px; letter-spacing: 0.12em;
  color: var(--ink-dim);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  opacity: 0; transition: opacity .8s; pointer-events: none; white-space: nowrap;
}
#hint.show { opacity: 1; }
#toast {
  position: fixed; bottom: 70px; left: 50%; transform: translateX(-50%) translateY(8px);
  z-index: 40; padding: 10px 22px; border-radius: 10px;
  background: var(--surface); color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  backdrop-filter: blur(12px); font-size: 12.5px; letter-spacing: 0.15em;
  opacity: 0; transition: opacity .3s, transform .3s; pointer-events: none;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============ 终末闪光 ============ */
#finale-flash {
  position: fixed; inset: 0; z-index: 30; pointer-events: none;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  background: radial-gradient(circle at 50% 50%,
    color-mix(in srgb, var(--accent) 30%, transparent), transparent 65%);
  opacity: 0;
}
#finale-flash span {
  font-family: var(--font-serif); font-size: clamp(34px, 6vw, 72px);
  letter-spacing: 0.5em; text-indent: 0.5em; color: #fff8ea;
  text-shadow: 0 0 40px var(--accent), 0 0 90px var(--accent);
}
#finale-flash em {
  font-style: normal; font-size: 13px; letter-spacing: 0.4em;
  color: var(--accent2); font-family: var(--font-mono);
}
#finale-flash.play { animation: finale 2.6s ease-out both; }
@keyframes finale {
  0% { opacity: 0; transform: scale(1.06); }
  12% { opacity: 1; transform: scale(1); }
  60% { opacity: 1; }
  100% { opacity: 0; transform: scale(0.985); }
}

/* ============ 帮助 ============ */
#help-overlay {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(3, 2, 8, 0.62);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
}
#help-overlay[hidden] { display: none; }
.help-card {
  width: min(430px, calc(100vw - 40px));
  background: var(--surface); border-radius: 16px; padding: 28px 30px;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}
.help-card h3 {
  font-family: var(--font-serif); letter-spacing: 0.35em;
  color: var(--accent); font-size: 19px; margin-bottom: 18px;
}
.help-card ul { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.help-card li { display: flex; gap: 14px; font-size: 13px; align-items: baseline; }
.help-card li b {
  flex: none; width: 92px; color: var(--accent2);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.05em;
}
.help-card li span { color: var(--ink-dim); }
.help-note {
  margin-top: 18px; padding-top: 14px; font-size: 11.5px; line-height: 1.8;
  color: var(--ink-dim);
  border-top: 1px solid color-mix(in srgb, var(--accent) 16%, transparent);
}
#btn-help-close {
  margin-top: 18px; width: 100%; padding: 11px 0;
  background: var(--accent); color: #0a0614; font-weight: 600;
  border: none; border-radius: 10px; font-size: 13px; letter-spacing: 0.25em;
  transition: box-shadow .2s, transform .2s;
}
#btn-help-close:hover { box-shadow: 0 6px 26px color-mix(in srgb, var(--accent) 50%, transparent); transform: translateY(-1px); }

/* ============ 加载 / 回退 ============ */
#loader {
  position: fixed; inset: 0; z-index: 100; background: var(--bg);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 22px;
  transition: opacity .9s ease;
}
#loader.done { opacity: 0; pointer-events: none; }
.loader-clock {
  width: 74px; height: 74px; border-radius: 50%; position: relative;
  border: 2px solid color-mix(in srgb, var(--accent) 70%, transparent);
  border-top-color: transparent; border-right-color: color-mix(in srgb, var(--accent2) 60%, transparent);
  animation: spin 2.4s linear infinite;
  box-shadow: 0 0 34px color-mix(in srgb, var(--accent) 25%, transparent),
              inset 0 0 20px color-mix(in srgb, var(--accent) 12%, transparent);
}
.loader-clock i {
  position: absolute; left: 50%; top: 50%; width: 2px; height: 26px;
  background: var(--accent); transform-origin: 50% 100%;
  transform: translate(-50%, -100%);
  animation: spin 1.1s steps(60) infinite;
  box-shadow: 0 0 8px var(--accent);
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader-clock i { animation-name: spinHand; }
@keyframes spinHand { to { transform: translate(-50%, -100%) rotate(360deg); } }
.loader-title {
  font-family: var(--font-serif); font-size: 24px; letter-spacing: 0.5em;
  text-indent: 0.5em; color: var(--ink);
}
.loader-bar {
  width: 220px; height: 2px; background: rgba(255, 255, 255, 0.1);
  border-radius: 1px; overflow: hidden;
}
#loader-fill {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  box-shadow: 0 0 12px var(--accent);
  transition: width .4s ease;
}
.loader-status { font-size: 11px; letter-spacing: 0.3em; color: var(--ink-dim); font-family: var(--font-mono); }

#fallback {
  position: fixed; inset: 0; z-index: 110; background: var(--bg);
  display: flex; align-items: center; justify-content: center;
}
#fallback[hidden] { display: none; }
.fallback-card {
  text-align: center; padding: 40px;
  border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent);
  border-radius: 16px; background: var(--surface);
}
.fallback-card h3 { color: var(--danger); letter-spacing: 0.3em; margin-bottom: 14px; font-family: var(--font-serif); }
.fallback-card p { color: var(--ink-dim); font-size: 13px; line-height: 2; }

/* ============ 入场编排 ============ */
.brand, .top-actions, #panel, #hud-bottom { opacity: 0; }
body.ready .brand { animation: rise .9s .15s cubic-bezier(.2, .7, .2, 1) both; }
body.ready .top-actions { animation: rise .9s .35s cubic-bezier(.2, .7, .2, 1) both; }
body.ready #panel { animation: slideIn .9s .55s cubic-bezier(.2, .7, .2, 1) both; }
body.ready #hud-bottom { animation: rise .9s .75s cubic-bezier(.2, .7, .2, 1) both; }
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: translateX(0); } }

/* ============ 响应式 ============ */
@media (max-width: 860px) {
  #hud-top { padding: 16px 16px; }
  .brand h1 { letter-spacing: 0.2em; margin: 5px 0 3px; }
  .brand .sub { letter-spacing: 0.34em; }
  .overline { font-size: 9px; letter-spacing: 0.22em; }
  #sound-label { display: none; }
  .icon-btn { padding: 9px 10px; }

  #panel {
    left: 12px; right: 12px; top: auto; bottom: 12px; width: auto;
    max-height: 44vh;
  }
  #panel.collapsed { max-height: none; }
  .panel-body { padding: 12px 14px 14px; }
  #hud-bottom { left: 16px; bottom: auto; top: 118px; }
  #countdown { font-size: 19px; }
  .stats { gap: 12px; font-size: 10px; margin-top: 8px; }
  #hint { display: none; }
  #toast { bottom: calc(44vh + 24px); }
}
@media (prefers-reduced-motion: reduce) {
  .brand, .top-actions, #panel, #hud-bottom { animation-duration: 0.01s !important; }
}