/* 《隙·门里门外》— 3D 门观察台 */

:root {
  --ink: oklch(0.18 0.02 280);
  --paper: oklch(0.94 0.015 80);
  --warm-core: oklch(0.72 0.15 55);
  --warm-deep: oklch(0.48 0.14 40);
  --cool-shell: oklch(0.32 0.08 290);
  --accent-gold: oklch(0.82 0.12 85);
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

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

html, body {
  width: 100%; height: 100%; overflow: hidden;
  background: #050508; color: var(--paper);
  font-family: var(--font-sans);
  user-select: none; -webkit-user-select: none;
}

#root { width: 100vw; height: 100vh; position: relative; overflow: hidden; }

/* === 观察台底色 === */
.observatory {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 70%, oklch(0.25 0.06 290) 0%, oklch(0.08 0.02 285) 60%, #000 100%),
    #000;
  overflow: hidden;
  cursor: grab;
  perspective: 2400px;
  perspective-origin: 50% 50%;
}
.observatory.dragging { cursor: grabbing; }

/* 网格地面 */
.floor {
  position: absolute;
  left: 50%;
  top: 58%;
  width: 3200px;
  height: 3200px;
  transform-origin: center center;
  transform: translate(-50%, -50%) rotateX(75deg);
  background-image:
    linear-gradient(oklch(0.7 0.08 60 / 0.12) 1px, transparent 1px),
    linear-gradient(90deg, oklch(0.7 0.08 60 / 0.12) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 10%, transparent 65%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 10%, transparent 65%);
  pointer-events: none;
  z-index: 1;
}

/* 暗角 */
.observatory::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, transparent 35%, rgba(0,0,0,0.6) 100%);
  pointer-events: none; z-index: 100;
}

/* === 3D 门 === */
.door-scene {
  position: absolute;
  left: 50%; top: 50%;
  width: 480px;
  height: 680px;
  transform-style: preserve-3d;
  transform: translate(-50%, -50%);
  will-change: transform;
  z-index: 20;
}

.door-face {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  backface-visibility: visible;
}

.door-face img {
  width: 100%; height: 100%;
  display: block;
  pointer-events: none;
  -webkit-user-drag: none;
}

/* 正面：原画 */
.face-front {
  transform: translateZ(30px);
  box-shadow:
    0 0 60px oklch(0.7 0.15 55 / 0.5),
    0 0 120px oklch(0.5 0.12 40 / 0.3);
}
.face-front img {
  border-radius: 2px;
  filter: brightness(1.15) saturate(1.1);
}

/* 背面：翻转的原画 + 暗化 */
.face-back {
  transform: translateZ(-30px) rotateY(180deg);
  filter: brightness(0.35) saturate(0.4) blur(0.5px);
}
.face-back::after {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 45%, oklch(0.55 0.12 50 / 0.4) 0%, transparent 60%),
    repeating-linear-gradient(90deg,
      oklch(0.15 0.02 280) 0 2px,
      oklch(0.18 0.03 280) 2px 4px);
  mix-blend-mode: overlay;
  opacity: 0.8;
}

/* 侧面：厚度（门的 6cm 厚度） */
.face-side {
  width: 60px;
  top: 0; bottom: 0;
  background: linear-gradient(180deg,
    oklch(0.28 0.05 40) 0%,
    oklch(0.18 0.04 30) 50%,
    oklch(0.12 0.03 30) 100%);
  border-top: 1px solid oklch(0.4 0.08 50);
  border-bottom: 1px solid oklch(0.08 0.02 30);
}
.face-side::before {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg,
    rgba(255,255,255,0.02) 0 1px,
    transparent 1px 14px);
}
.face-left {
  left: 0;
  transform: translateX(-30px) rotateY(-90deg);
  transform-origin: left center;
  width: 60px;
  left: auto;
  right: 100%;
  margin-right: -30px;
}
.face-right {
  right: 0;
  transform: translateX(30px) rotateY(90deg);
  transform-origin: right center;
  width: 60px;
  left: 100%;
  margin-left: -30px;
}

.face-top, .face-bottom {
  height: 60px;
  left: 0; right: 0;
  background: linear-gradient(90deg,
    oklch(0.2 0.04 30),
    oklch(0.28 0.06 40),
    oklch(0.2 0.04 30));
}
.face-top {
  top: 0;
  transform: translateY(-30px) rotateX(90deg);
  transform-origin: center top;
  top: auto;
  bottom: 100%;
  margin-bottom: -30px;
}
.face-bottom {
  bottom: 0;
  transform: translateY(30px) rotateX(-90deg);
  transform-origin: center bottom;
  top: 100%;
  margin-top: -30px;
}

/* 门的辉光基座 */
.door-glow-base {
  position: absolute;
  left: 50%; top: 100%;
  width: 120%;
  height: 200px;
  transform: translate(-50%, -50%) rotateX(90deg);
  background: radial-gradient(ellipse at center,
    oklch(0.75 0.18 55 / 0.55) 0%,
    oklch(0.55 0.15 40 / 0.25) 30%,
    transparent 65%);
  pointer-events: none;
  filter: blur(20px);
}

/* 门正面的浮雕光圈 */
.door-halo {
  position: absolute;
  inset: -40px;
  border-radius: 4px;
  background: radial-gradient(ellipse at 50% 45%,
    oklch(0.85 0.12 70 / 0.35) 0%,
    transparent 70%);
  filter: blur(30px);
  pointer-events: none;
  transform: translateZ(10px);
  animation: halo-pulse 5s ease-in-out infinite;
}
@keyframes halo-pulse {
  0%, 100% { opacity: 0.6; transform: translateZ(10px) scale(1); }
  50% { opacity: 1; transform: translateZ(10px) scale(1.08); }
}

/* === HUD === */
.hud {
  position: absolute; z-index: 200;
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.22em;
  color: oklch(0.85 0.02 80 / 0.85);
  text-transform: uppercase;
  pointer-events: none;
  mix-blend-mode: screen;
}
.hud-tl { top: 22px; left: 26px; }
.hud-tr { top: 22px; right: 26px; text-align: right; }
.hud-bl { bottom: 22px; left: 50%; transform: translateX(-50%); text-align: center; }
.hud-br { bottom: 22px; right: 26px; text-align: right; pointer-events: auto; }

.hud .big { font-size: 18px; color: var(--accent-gold); letter-spacing: 0.08em; }
.hud .sep { opacity: 0.4; margin: 0 6px; }
.hud .sub { opacity: 0.5; margin-top: 4px; font-size: 9px; }

.hud-br { display: flex; gap: 6px; }
.hud-br button {
  background: transparent;
  border: 1px solid oklch(0.85 0.02 80 / 0.3);
  color: oklch(0.85 0.02 80 / 0.8);
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s;
}
.hud-br button:hover {
  background: oklch(0.85 0.02 80 / 0.1);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}
.hud-br button.active {
  background: oklch(0.82 0.12 85 / 0.15);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

/* 视角指示器 */
.compass {
  position: absolute;
  left: 26px; top: 50%;
  transform: translateY(-50%);
  z-index: 200;
  pointer-events: none;
}
.compass svg { display: block; }
.compass .label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: oklch(0.85 0.02 80 / 0.5);
  margin-top: 8px;
  text-align: center;
  text-transform: uppercase;
}

/* === 漂浮标签线（指向门上细节） === */
.annotation {
  position: absolute;
  z-index: 60;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--accent-gold);
  text-transform: uppercase;
  pointer-events: none;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.8s;
}
.annotation.on { opacity: 1; }
.annotation .line {
  display: block;
  width: 80px;
  height: 1px;
  background: oklch(0.82 0.12 85 / 0.6);
  margin-bottom: 6px;
}
.annotation .num {
  font-size: 11px;
  margin-right: 8px;
  color: var(--paper);
}
.annotation .zh {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper);
  display: block;
  margin-top: 2px;
}

/* === 可拖动信息卡 === */
.card {
  position: absolute;
  background: oklch(0.94 0.015 80 / 0.94);
  color: var(--ink);
  border-radius: 2px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4), 0 30px 80px rgba(0,0,0,0.5);
  z-index: 150;
  pointer-events: auto;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid oklch(0.75 0.02 80 / 0.3);
  overflow: hidden;
}
.card.dragging { z-index: 300; }
.card.collapsed .card-body { display: none; }

.card-head {
  display: flex; align-items: center;
  padding: 9px 12px;
  background: var(--ink);
  color: var(--paper);
  cursor: grab;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  gap: 8px;
}
.card-head:active { cursor: grabbing; }
.card-head .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-gold); }
.card-head .tag { flex: 1; }
.card-head .ctrl { opacity: 0.55; cursor: pointer; padding: 0 5px; font-weight: 500; }
.card-head .ctrl:hover { opacity: 1; }

.card-body { padding: 16px 18px 18px; }

/* 主标题卡 */
.card.title-card { background: oklch(0.96 0.01 80); border-left: 3px solid var(--warm-core); width: 300px; }
.card.title-card .zh {
  font-family: var(--font-serif);
  font-size: 30px; font-weight: 700;
  line-height: 1.05; letter-spacing: 0.06em;
  color: var(--ink); margin-bottom: 4px;
}
.card.title-card .zh .gap { color: var(--warm-deep); font-style: italic; margin: 0 0.1em; }
.card.title-card .en {
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.45em;
  text-transform: uppercase;
  color: oklch(0.45 0.05 40);
  margin-bottom: 14px;
}
.card.title-card .sub {
  font-family: var(--font-serif);
  font-size: 12.5px; line-height: 1.75;
  color: oklch(0.3 0.03 285);
}

.card.desc-card { width: 300px; }
.card.desc-card p {
  font-family: var(--font-serif);
  font-size: 12.5px; line-height: 1.85;
  color: oklch(0.24 0.02 285);
  text-align: justify;
  text-wrap: pretty;
}
.card.desc-card p + p { margin-top: 10px; }
.card.desc-card .caption {
  font-family: var(--font-mono);
  font-size: 9px; letter-spacing: 0.22em;
  color: oklch(0.5 0.04 40);
  margin-top: 14px; padding-top: 10px;
  border-top: 1px solid oklch(0.85 0.02 80);
}

.card.glossary-card { width: 260px; }
.card.glossary-card .item {
  display: flex; gap: 10px;
  padding: 7px 0;
  border-bottom: 1px dotted oklch(0.8 0.02 80);
  align-items: flex-start;
}
.card.glossary-card .item:last-child { border: none; }
.card.glossary-card .num {
  font-family: var(--font-mono);
  font-size: 10px; color: var(--warm-deep);
  min-width: 22px; padding-top: 1px;
}
.card.glossary-card .label {
  font-family: var(--font-serif);
  font-size: 13px; font-weight: 600;
  color: var(--ink);
}
.card.glossary-card .def {
  font-family: var(--font-mono);
  font-size: 9px; line-height: 1.5;
  letter-spacing: 0.05em;
  color: oklch(0.45 0.03 285);
  margin-top: 2px;
}

.card.author-card { width: 240px; }
.card.author-card .line {
  font-family: var(--font-mono);
  font-size: 10px; line-height: 1.9;
  letter-spacing: 0.08em;
  display: flex; justify-content: space-between;
  padding: 3px 0;
  border-bottom: 1px dotted oklch(0.8 0.02 80);
}
.card.author-card .line:last-child { border: none; }
.card.author-card .k { color: oklch(0.5 0.04 40); text-transform: uppercase; }
.card.author-card .v { color: var(--ink); }

.card.spec-card { width: 220px; }
.card.spec-card .sw-row { display: flex; gap: 3px; margin-top: 8px; }
.card.spec-card .sw { flex: 1; height: 42px; }
.card.spec-card .meta {
  font-family: var(--font-mono);
  font-size: 8.5px; letter-spacing: 0.15em;
  color: oklch(0.4 0.02 285);
  margin-top: 6px;
  display: flex; justify-content: space-between;
}

/* 漂浮汉字 */
.float-kanji {
  position: absolute;
  font-family: var(--font-serif);
  z-index: 55;
  cursor: grab;
  pointer-events: auto;
  white-space: nowrap;
  padding: 6px 10px;
  opacity: 0.5;
  transition: opacity 0.3s;
  text-shadow: 0 0 20px oklch(0.7 0.15 55 / 0.5);
}
.float-kanji:active { cursor: grabbing; }
.float-kanji:hover { opacity: 1; }

/* 粒子 */
.particles { position: absolute; inset: 0; pointer-events: none; z-index: 25; overflow: hidden; }
.particle { position: absolute; will-change: transform, opacity; }

.firefly {
  width: 3px; height: 3px; border-radius: 50%;
  background: oklch(0.92 0.15 85);
  box-shadow: 0 0 4px oklch(0.92 0.15 85), 0 0 12px oklch(0.82 0.18 70 / 0.7);
}
.petal {
  width: 12px; height: 9px;
  border-radius: 100% 0 100% 0;
  opacity: 0.7;
  filter: blur(0.3px);
}

/* Intro */
.intro-overlay {
  position: absolute; inset: 0;
  z-index: 400; pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 30%, rgba(0,0,0,0.7) 100%);
  opacity: 1; transition: opacity 1.2s;
}
.intro-overlay.hidden { opacity: 0; }
.intro-title {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--paper);
  opacity: 0;
  animation: introFade 6.5s ease-in-out forwards;
}
@keyframes introFade {
  0% { opacity: 0; transform: translate(-50%, -48%); }
  15% { opacity: 1; transform: translate(-50%, -50%); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, -52%); }
}
.intro-title .zh {
  font-family: var(--font-serif);
  font-size: 72px; font-weight: 700;
  letter-spacing: 0.15em;
  text-shadow: 0 0 50px oklch(0.7 0.15 55 / 0.7);
}
.intro-title .zh .gap { color: var(--accent-gold); }
.intro-title .en {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.55em;
  margin-top: 14px; opacity: 0.7;
  text-transform: uppercase;
}
.intro-title .hint {
  font-family: var(--font-serif);
  font-size: 13px; letter-spacing: 0.2em;
  margin-top: 38px; opacity: 0.5;
  animation: hintBlink 2.4s ease-in-out 3s infinite;
}
@keyframes hintBlink {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.75; }
}

/* Tweaks */
.tweaks {
  position: fixed; right: 16px; top: 64px; width: 240px;
  background: oklch(0.1 0.02 285 / 0.95);
  color: var(--paper);
  border: 1px solid oklch(0.3 0.04 285);
  z-index: 500;
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.1em;
  display: none;
  backdrop-filter: blur(10px);
}
.tweaks.on { display: block; }
.tweaks h4 {
  padding: 10px 14px;
  background: var(--ink);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  font-size: 10px;
}
.tweaks .row {
  padding: 8px 14px;
  border-bottom: 1px solid oklch(0.2 0.02 285);
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.tweaks .row:last-child { border: none; }
.tweaks label { opacity: 0.7; text-transform: uppercase; }
.tweaks input[type="range"] { width: 100px; accent-color: var(--accent-gold); }
.tweaks select {
  background: var(--ink); color: var(--paper);
  border: 1px solid oklch(0.3 0.04 285);
  padding: 3px 6px;
  font-family: var(--font-mono); font-size: 10px;
}