/* =========================================================
   Galok · 海上浮岛  —  纯静态样式
   ========================================================= */

:root {
  --hud-fg: rgba(238, 246, 255, 0.92);
  --hud-fg-dim: rgba(238, 246, 255, 0.62);
  --glass: rgba(255, 255, 255, 0.14);
  --glass-strong: rgba(255, 255, 255, 0.22);
  --glass-border: rgba(255, 255, 255, 0.35);
  --ink: #0b1f33;
  --shadow: 0 18px 50px -18px rgba(6, 30, 60, 0.55);
}

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

html,
body {
  height: 100%;
  overflow: hidden;
  background: #0a1830;
  font-family:
    "Noto Sans SC",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

body {
  position: relative;
  color: var(--hud-fg);
  width: 100vw;
  height: 100dvh;
}

/* 背景画布 */
#ocean-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
  cursor: crosshair;
}

/* ================= 顶部 HUD ================= */
.hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(14px, 2.6vh, 26px) clamp(16px, 3.2vw, 38px);
  pointer-events: none;
}
.hud > * {
  pointer-events: auto;
}

.hud-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.hud-mark {
  font-size: 1.4em;
  opacity: 0.85;
  text-shadow: 0 0 18px rgba(120, 200, 255, 0.6);
  animation: bob 6s ease-in-out infinite;
}
.hud-name {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(1.1rem, 2.4vw, 1.55rem);
  font-weight: 600;
  letter-spacing: 0.12em;
}

.hud-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.hud-clock {
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  opacity: 0.8;
  font-weight: 400;
}
.hud-mode {
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  opacity: 0.92;
  min-width: 3.2em;
  text-align: center;
  transition:
    color 0.8s ease,
    border-color 0.8s ease,
    background 0.8s ease;
}
@media (max-width: 640px) {
  .hud-mode {
    display: none;
  }
}

/* 时间流速按钮：文字型，与 hud-mode 风格一致；加速时点亮 */
.time-scale-btn {
  font-family: inherit;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--hud-fg-dim);
  cursor: pointer;
  min-width: 3em;
  text-align: center;
  transition:
    color 0.3s ease,
    border-color 0.3s ease,
    background 0.3s ease,
    box-shadow 0.4s ease;
}
.time-scale-btn:hover {
  color: var(--hud-fg);
  border-color: rgba(255, 255, 255, 0.55);
}
.time-scale-btn:active {
  transform: scale(0.94);
}
.time-scale-btn.is-fast {
  color: #fff;
  border-color: rgba(255, 220, 150, 0.7);
  background: rgba(190, 150, 70, 0.45);
  box-shadow:
    0 0 14px rgba(255, 200, 110, 0.55),
    inset 0 0 8px rgba(255, 230, 160, 0.3);
}
.time-scale-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}
@media (max-width: 640px) {
  .time-scale-btn {
    padding: 3px 8px;
    min-width: 2.6em;
  }
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--hud-fg);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition:
    transform 0.3s ease,
    background 0.3s ease,
    box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}
.theme-toggle:hover {
  transform: translateY(-2px) rotate(8deg);
  background: var(--glass-strong);
  box-shadow: 0 8px 22px -8px rgba(120, 200, 255, 0.5);
}
.theme-toggle:active {
  transform: translateY(0) scale(0.94);
}
/* 主题图标三态：白天=太阳，黄昏=半日落，夜晚=月亮。
   三个 SVG 绝对定位堆叠于按钮中心，按 data-period 切换显隐；
   data-period 由 app.js 写入真实时段（day/dusk/night），auto 模式下也写实际值。 */
.theme-toggle svg {
  position: absolute;
  top: 50%;
  left: 50%;
  transition:
    transform 0.5s cubic-bezier(0.4, 1.6, 0.5, 1),
    opacity 0.4s ease;
  transform: translate(-50%, -50%) scale(0);
  opacity: 0;
}
body[data-period="day"] .ico-sun {
  transform: translate(-50%, -50%) scale(1) rotate(0);
  opacity: 1;
}
body[data-period="dusk"] .ico-dusk {
  transform: translate(-50%, -50%) scale(1) rotate(0);
  opacity: 1;
}
body[data-period="night"] .ico-moon {
  transform: translate(-50%, -50%) scale(1) rotate(0);
  opacity: 1;
}

/* 自动模式徽标（小圆环） */
.auto-badge {
  position: absolute;
  inset: auto auto -3px -3px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid #bfe6ff;
  background: #4a9fd6;
  box-shadow: 0 0 8px rgba(74, 159, 214, 0.9);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
body[data-mode="auto"] .auto-badge {
  opacity: 1;
}

/* ================= 天气开关（雨 / 闪电） ================= */
.weather-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--hud-fg-dim);
  display: grid;
  place-items: center;
  cursor: pointer;
  position: relative;
  transition:
    transform 0.3s ease,
    background 0.3s ease,
    box-shadow 0.4s ease,
    color 0.3s ease,
    border-color 0.3s ease;
}
.weather-btn svg {
  display: block;
  transition: transform 0.4s cubic-bezier(0.4, 1.6, 0.5, 1);
}
.weather-btn:hover {
  transform: translateY(-2px);
  background: var(--glass-strong);
  color: var(--hud-fg);
}
.weather-btn:hover svg {
  transform: scale(1.08);
}
.weather-btn:active {
  transform: translateY(0) scale(0.94);
}

/* 激活态：按钮点亮 + 发光 */
.weather-btn.is-active {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.7);
}
#weather-rain.is-active {
  background: rgba(74, 159, 214, 0.55);
  box-shadow:
    0 0 18px rgba(74, 159, 214, 0.7),
    inset 0 0 10px rgba(150, 220, 255, 0.4);
  color: #eaf6ff;
}
#weather-lightning.is-active {
  background: rgba(190, 150, 70, 0.5);
  box-shadow:
    0 0 18px rgba(255, 220, 130, 0.7),
    inset 0 0 10px rgba(255, 230, 160, 0.4);
  color: #fff7e0;
}

/* 自动态徽标：小圆环，仅 is-auto 时显示，区别于"立即"态 */
.weather-badge {
  position: absolute;
  inset: auto auto -3px -3px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: #4a9fd6;
  box-shadow: 0 0 6px rgba(74, 159, 214, 0.9);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
#weather-lightning .weather-badge {
  background: #c9a14a;
  box-shadow: 0 0 6px rgba(255, 220, 130, 0.9);
}
.weather-btn.is-auto .weather-badge {
  opacity: 1;
}

/* 闪电激活时图标偶尔闪烁，呼应闪电的随机性 */
#weather-lightning.is-active .ico-bolt {
  animation: bolt-pulse 3.2s ease-in-out infinite;
}
@keyframes bolt-pulse {
  0%, 46%, 54%, 100% { filter: brightness(1); }
  49%, 51% { filter: brightness(2); }
}

/* ================= 中央标语 ================= */
.tagline {
  position: fixed;
  z-index: 10;
  top: 14%;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  pointer-events: none;
  width: 92%;
}
.tagline-title {
  font-family: "Cormorant Garamond", serif;
  font-weight: 400;
  font-size: clamp(2rem, 6vw, 3.6rem);
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.96),
    rgba(180, 220, 255, 0.7)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 4px 22px rgba(0, 0, 0, 0.25));
}
.tagline-sub {
  margin-top: 10px;
  font-size: clamp(0.72rem, 1.6vw, 0.9rem);
  letter-spacing: 0.22em;
  opacity: 0.78;
  font-weight: 300;
}

/* ================= 浮岛卡片 ================= */
.islands {
  position: fixed;
  z-index: 15;
  inset: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(20px, 4vw, 56px);
  perspective: 1100px;
  perspective-origin: 50% 62%;
  padding: 23vh clamp(16px, 5vw, 40px) 10vh;
  pointer-events: none; /* 让画布接收水波事件，卡片自身重新打开 */
}
.islands .island {
  pointer-events: auto;
}

.island {
  --bob-dur: 7s;
  --bob-delay: 0s;
  --raft-tilt: -0.8deg;
  width: clamp(150px, 22vw, 210px);
  height: clamp(245px, 32vh, 292px);
  position: absolute;
  left: 50%;
  top: 50%;
  cursor: pointer;
  transform-style: preserve-3d;
  animation: none;
  transition: filter 0.28s ease-out, opacity 0.4s ease;
  filter: drop-shadow(0 22px 28px rgba(6, 30, 60, 0.38));
  will-change: transform, left, top;
}
.island.is-css-float {
  animation: water-drift var(--bob-dur) ease-in-out infinite;
  animation-delay: var(--bob-delay);
}
.island[data-type="blog"] {
  --raft-tilt: -1.2deg;
}
.island[data-type="books"] {
  --raft-tilt: 1.1deg;
}

.island-card {
  position: absolute;
  inset: 0;
  overflow: visible;
  border: 0;
  background: transparent;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  transform: rotateX(9deg) rotateZ(var(--raft-tilt));
  transform-origin: 50% 100%;
  transform-style: preserve-3d;
  transition: transform 220ms cubic-bezier(0.23, 1, 0.32, 1);
  will-change: transform;
}
.island-card::before {
  /* 底部湿润高光：水面反光打在卡片底缘，强化"卡片浸在水里"的拟物感 */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 14px;
  background: linear-gradient(
    180deg,
    rgba(150, 220, 248, 0) 0%,
    rgba(130, 205, 240, 0.32) 70%,
    rgba(110, 190, 230, 0.42) 100%
  );
  pointer-events: none;
  z-index: 1;
  border-radius: 0 0 18px 18px;
  transition: opacity 0.3s ease;
}

@media (hover: hover) and (pointer: fine) {
  .island:hover {
    filter: drop-shadow(0 34px 38px rgba(6, 30, 60, 0.5));
    z-index: 16;
  }
  .island:hover .island-card {
    transform: translateY(-7px) rotateX(5deg) rotateZ(var(--raft-tilt))
      scale(1.025);
  }
  .island:hover .island-card::before {
    opacity: 0.32; /* 悬浮离开水面 → 湿润高光变淡 */
  }
  .island:hover::before {
    opacity: 0.4; /* 接触阴影也变虚 */
    filter: blur(11px);
  }
  .island:hover .island-go {
    transform: rotate(-45deg) translateX(2px);
  }
}
.island:active .island-card {
  transform: translateY(-3px) rotateX(7deg) rotateZ(var(--raft-tilt))
    scale(0.985);
}

/* 卡片顶部彩条 */
.island-stripe {
  display: none;
}

/* 卡片视觉区（每种站点不同插画） */
.island-visual {
  flex: 1;
  position: relative;
  display: grid;
  place-items: center;
  padding: 18px 16px 8px;
  overflow: visible;
  perspective: 700px;
  transform-style: preserve-3d;
}

/* —— Blog 视觉：一张文章卡 —— */
.vis-blog {
  color: rgba(255, 255, 255, 0.92);
}
.vis-blog .paper {
  width: 86%;
  height: 88%;
  position: relative;
  z-index: 1;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.92),
    rgba(238, 246, 255, 0.86)
  );
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 7px 7px 5px 5px;
  padding: 12px 11px;
  box-shadow:
    0 14px 18px -11px rgba(10, 30, 60, 0.68),
    7px 7px 0 -5px rgba(225, 239, 247, 0.66),
    10px 10px 12px -10px rgba(10, 30, 60, 0.6);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transform: translateZ(17px) rotateX(4deg) rotate(-3.5deg);
  transform-origin: 50% 100%;
  transform-style: preserve-3d;
}
.vis-blog .paper::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 7px -8px -8px 7px;
  border: 1px solid rgba(223, 238, 247, 0.78);
  border-radius: 5px;
  background: linear-gradient(180deg, #eef6fb, #d9e8f0);
  transform: translateZ(-8px) rotate(4deg);
  box-shadow: 0 8px 14px -10px rgba(10, 30, 60, 0.7);
}
.vis-blog .paper::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 28px;
  height: 28px;
  background: linear-gradient(
    135deg,
    rgba(206, 226, 237, 0.95) 0 48%,
    rgba(255, 255, 255, 0.2) 49%
  );
  clip-path: polygon(0 0, 100% 100%, 100% 0);
  opacity: 0.88;
}
.vis-blog .paper .line {
  height: 4px;
  border-radius: 2px;
  background: #b9d4e8;
}
.vis-blog .paper .line.title {
  height: 8px;
  width: 62%;
  background: var(--accent, #4a9fd6);
  margin-bottom: 4px;
}
.vis-blog .paper .line.s {
  width: 92%;
}
.vis-blog .paper .line.m {
  width: 78%;
}
.vis-blog .paper .line.t {
  width: 50%;
}
.vis-blog .paper .pic {
  height: 26%;
  border-radius: 6px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.22), transparent 42%),
    linear-gradient(135deg, #9fd3f0, #4a9fd6 58%, #2f729c);
  margin: 4px 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}
.vis-blog .paper .tag {
  align-self: flex-start;
  font-size: 7px;
  padding: 2px 6px;
  border-radius: 10px;
  background: rgba(74, 159, 214, 0.18);
  color: #2a6c9a;
  letter-spacing: 0.1em;
}

/* —— Books 视觉：书堆 —— */
.vis-books {
  color: rgba(255, 255, 255, 0.92);
}
.vis-books .stack {
  width: 80%;
  height: 86%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
  transform: translateZ(18px) rotateX(12deg) rotateZ(-2deg);
  transform-style: preserve-3d;
}
.vis-books .bk {
  height: 20%;
  border-radius: 3px 6px 6px 3px;
  position: relative;
  box-shadow:
    0 6px 14px -8px rgba(10, 30, 60, 0.6),
    inset 6px 0 0 rgba(255, 255, 255, 0.18);
  display: flex;
  align-items: center;
  padding-left: 16px;
  font-size: 8px;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.9);
  transform-origin: left center;
  transform-style: preserve-3d;
  overflow: visible;
}
.vis-books .bk::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12%;
  bottom: 12%;
  width: 2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.35);
  transform: translateZ(2px);
}
.vis-books .bk::after {
  content: "";
  position: absolute;
  right: 3%;
  top: 13%;
  bottom: 13%;
  width: 15%;
  border-radius: 0 3px 3px 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 246, 218, 0.82) 0 1px,
    rgba(194, 157, 112, 0.58) 1px 2px
  );
  transform: skewY(-2deg) translateZ(1px);
  opacity: 0.82;
}
.vis-books .bk:nth-child(1) {
  width: 92%;
  background: linear-gradient(90deg, #d98b6a, #c9754f);
  transform: rotate(-1.5deg);
}
.vis-books .bk:nth-child(2) {
  width: 100%;
  background: linear-gradient(90deg, #5a8fb8, #3f6f96);
}
.vis-books .bk:nth-child(3) {
  width: 86%;
  background: linear-gradient(90deg, #8a7bb8, #6a5b9a);
  transform: rotate(1.2deg);
}
.vis-books .bk:nth-child(4) {
  width: 96%;
  background: linear-gradient(90deg, #6ab08a, #4a9070);
}
.vis-books .bookmark {
  position: absolute;
  top: -6%;
  left: 56%;
  width: 10px;
  height: 30%;
  background: rgba(255, 255, 255, 0.85);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 78%, 0 100%);
  opacity: 0.9;
  transform: translateZ(16px) rotate(2deg);
}

/* 卡片底部信息 */
.island-foot {
  width: max-content;
  max-width: 100%;
  margin: 0 auto;
  padding: 4px 2px 3px;
  background: transparent;
  border: 0;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.island-name {
  font-family: "Cormorant Garamond", serif;
  font-size: 1.18rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #fff;
  text-shadow: 0 2px 8px rgba(6, 30, 60, 0.4);
}
.island-desc {
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  opacity: 0.7;
  margin-top: 2px;
}
.island-go {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent, #4a9fd6);
  color: #fff;
  box-shadow: 0 4px 12px -4px var(--accent, #4a9fd6);
  transition: transform 0.35s cubic-bezier(0.4, 1.6, 0.5, 1);
}
.island-go svg {
  width: 13px;
  height: 13px;
}

/* 水面接触阴影 + 被风打散的倒影 */
.island::before {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: -6%;
  height: 25%;
  z-index: -2;
  pointer-events: none;
  border-radius: 50%;
  background:
    radial-gradient(
      ellipse at center,
      rgba(12, 57, 77, 0.48) 0 22%,
      transparent 52%
    ),
    radial-gradient(
      ellipse at center,
      transparent 35%,
      rgba(132, 220, 235, 0.24) 39% 41%,
      transparent 47%
    );
  filter: blur(8px);
  opacity: 0.78;
  transform: translateZ(-18px) scaleY(0.34);
  transition:
    opacity 0.3s ease,
    filter 0.3s ease;
}
.island::after {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  bottom: -24%;
  height: 31%;
  background:
    linear-gradient(180deg, rgba(176, 222, 238, 0.27), rgba(176, 222, 238, 0)),
    radial-gradient(
      ellipse at 50% 0%,
      rgba(146, 218, 234, 0.28),
      transparent 68%
    );
  border-radius: 46% 54% 50% 50%;
  filter: blur(8px) saturate(0.72);
  transform: translateZ(-11px) scaleY(-0.48) skewX(var(--raft-tilt));
  opacity: 0.46;
  z-index: -1;
  mix-blend-mode: screen;
}

/* 浮动呼吸动画 */
@keyframes water-drift {
  0%,
  100% {
    transform: translate3d(0, 2px, 0) rotateZ(calc(var(--raft-tilt) - 0.35deg))
      rotateX(0.8deg);
  }
  28% {
    transform: translate3d(-1px, -5px, 0)
      rotateZ(calc(var(--raft-tilt) + 0.2deg)) rotateX(-0.8deg);
  }
  58% {
    transform: translate3d(1px, -10px, 0)
      rotateZ(calc(var(--raft-tilt) + 0.6deg)) rotateX(1.1deg);
  }
  82% {
    transform: translate3d(0, -4px, 0) rotateZ(calc(var(--raft-tilt) - 0.1deg))
      rotateX(-0.5deg);
  }
}

@keyframes bob {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-3px);
  }
}

/* ================= 底部提示 ================= */
.footer-hint {
  position: fixed;
  z-index: 10;
  bottom: clamp(10px, 3vh, 26px);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  opacity: 0.5;
  font-weight: 300;
  pointer-events: none;
  white-space: nowrap;
}

/* 视角切换面板：左下角竖排小按钮 */
.view-panel {
  position: fixed;
  z-index: 14;
  bottom: clamp(10px, 3vh, 26px);
  left: clamp(10px, 3vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
}
.view-btn {
  pointer-events: auto;
  font-family: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  padding: 5px 13px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  color: var(--hud-fg-dim, rgba(255, 255, 255, 0.7));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
  transition:
    color 0.2s,
    border-color 0.2s,
    background 0.2s,
    transform 0.12s;
}
.view-btn:hover {
  color: var(--hud-fg);
  border-color: rgba(255, 255, 255, 0.55);
}
.view-btn:active {
  transform: scale(0.94);
}
.view-btn.is-active {
  color: #fff;
  border-color: rgba(150, 200, 255, 0.7);
  background: rgba(80, 140, 200, 0.45);
  box-shadow: 0 0 14px rgba(150, 200, 255, 0.45);
}
@media (max-width: 640px) {
  .view-panel {
    flex-direction: row;
    flex-wrap: wrap;
    max-width: 60vw;
  }
  .view-btn {
    padding: 4px 10px;
  }
}

/* ================= 昼夜文字色适配 ================= */
/* 夜晚文字更亮 */
body[data-theme="night"] {
  --hud-fg: rgba(228, 240, 255, 0.95);
}
body[data-theme="day"] {
  --hud-fg: rgba(11, 31, 51, 0.88);
  --hud-fg-dim: rgba(11, 31, 51, 0.6);
  --glass: rgba(255, 255, 255, 0.35);
  --glass-border: rgba(255, 255, 255, 0.55);
}

/* 白天标语颜色加深，提升对比度 */
body[data-theme="day"] .tagline-title {
  background: linear-gradient(
    180deg,
    rgba(11, 40, 71, 0.92),
    rgba(30, 90, 138, 0.85)
  );
  -webkit-background-clip: text;
  background-clip: text;
}
body[data-theme="day"] .tagline-sub {
  opacity: 0.8;
  color: #0b2847;
}
body[data-theme="day"] .footer-hint {
  color: #0b2847;
}

/* 白天卡片：水面较亮，使用更白净的毛玻璃 + 深色文字 */
body[data-theme="day"] .island-card {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}
body[data-theme="day"] .island-name {
  color: #0b2847;
  text-shadow: 0 1px 3px rgba(255, 255, 255, 0.5);
}
body[data-theme="day"] .island-desc {
  color: rgba(11, 40, 71, 0.62);
}
body[data-theme="day"] .island::after {
  background: linear-gradient(
    180deg,
    rgba(120, 180, 220, 0.4),
    rgba(120, 180, 220, 0)
  );
}

/* ================= 黄昏：暖色玻璃 + 暖白文字 =================
   黄昏海面天空偏橙红，背景已较暗 → 用暖白浅色文字，与橙红海面协调 */
body[data-theme="dusk"] {
  --hud-fg: rgba(255, 240, 220, 0.95);
  --hud-fg-dim: rgba(255, 220, 190, 0.66);
  --glass: rgba(255, 200, 150, 0.18);
  --glass-strong: rgba(255, 200, 150, 0.28);
  --glass-border: rgba(255, 210, 170, 0.42);
}
body[data-theme="dusk"] .tagline-title {
  background: linear-gradient(
    180deg,
    rgba(255, 246, 232, 0.96),
    rgba(255, 178, 128, 0.82)
  );
  -webkit-background-clip: text;
  background-clip: text;
}
body[data-theme="dusk"] .tagline-sub {
  color: #ffe6cc;
  opacity: 0.82;
}
body[data-theme="dusk"] .footer-hint {
  color: #ffd9b3;
}
body[data-theme="dusk"] .island-card {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}
body[data-theme="dusk"] .island-name {
  color: #fff5e0;
  text-shadow: 0 2px 10px rgba(60, 20, 0, 0.5);
}
body[data-theme="dusk"] .island-desc {
  color: rgba(255, 220, 180, 0.78);
}
body[data-theme="dusk"] .island::after {
  background: linear-gradient(
    180deg,
    rgba(255, 190, 140, 0.36),
    rgba(255, 190, 140, 0)
  );
}

/* 夜晚卡片：毛玻璃更通透，文字偏冷白 */
body[data-theme="night"] .island-name {
  color: #f2f8ff;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
}
body[data-theme="night"] .island-desc {
  color: rgba(220, 235, 255, 0.7);
}

/* 主题切换时的平滑过渡 */
body,
.island-card,
.island-name,
.island-desc,
.tagline-title,
.tagline-sub,
.footer-hint,
.hud-name,
.hud-clock,
.theme-toggle {
  transition-property:
    background,
    color,
    border-color,
    box-shadow,
    -webkit-text-fill-color;
  transition-duration: 0.8s;
}

/* ================= 响应式 ================= */
@media (max-width: 640px) {
  .tagline {
    top: 11%;
  }
  .tagline-title {
    letter-spacing: 0.28em;
  }
  .islands {
    gap: 18px;
    padding-top: 26vh;
  }
  .island {
    width: clamp(128px, 42vw, 168px);
  }
  .hud-clock {
    display: none;
  }
}
@media (max-height: 560px) {
  .tagline {
    top: 8%;
  }
  .islands {
    padding-top: 18vh;
  }
}

/* 减弱动画偏好 */
@media (prefers-reduced-motion: reduce) {
  .island,
  .hud-mark {
    animation: none !important;
  }
}