/* ============ 重置 & 主题变量 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #f8fafc;
  --bg-rgb: 248 250 252;
  --card: rgba(255, 255, 255, .78);
  --card-solid: rgba(255, 255, 255, .88);
  --card-hover: #ffffff;
  --border: rgba(148, 163, 184, .32);
  --border-hover: rgba(59, 130, 246, .45);
  --text: #1e293b;
  --dim: #64748b;
  --placeholder: #94a3b8;
  --accent: #2563eb;
  --accent-2: #3b82f6;
  --grid-line: rgba(99, 102, 241, .28);
  --card-shadow: rgba(37, 99, 235, .45);
  --scrollbar: rgba(100, 116, 139, .28);
  --scrollbar-hover: rgba(100, 116, 139, .45);
  --title-1: #1e3a8a;
  --title-2: #3b82f6;
  --title-3: #94a3b8;
  --selection: rgba(37, 99, 235, .18);
  --icon-bg: #f1f5f9;
  --icon-unknown: #94a3b8;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --ok: #10b981;
}

[data-theme="dark"] {
  --bg: #0b1120;
  --bg-rgb: 11 17 32;
  --card: rgba(30, 41, 59, .55);
  --card-solid: rgba(30, 41, 59, .85);
  --card-hover: rgba(30, 41, 59, .92);
  --border: rgba(71, 85, 105, .5);
  --border-hover: rgba(96, 165, 250, .55);
  --text: #e2e8f0;
  --dim: #94a3b8;
  --placeholder: #64748b;
  --accent: #3b82f6;
  --accent-2: #60a5fa;
  --grid-line: rgba(99, 102, 241, .2);
  --card-shadow: rgba(0, 0, 0, .65);
  --scrollbar: rgba(148, 163, 184, .22);
  --scrollbar-hover: rgba(148, 163, 184, .4);
  --title-1: #bfdbfe;
  --title-2: #60a5fa;
  --title-3: #94a3b8;
  --selection: rgba(96, 165, 250, .25);
  --icon-bg: rgba(241, 245, 249, .08);
  --icon-unknown: #64748b;
  --danger: #f87171;
  --danger-hover: #ef4444;
  --ok: #34d399;
}

/* ============ 基础 ============ */
html { scroll-behavior: smooth; }
html, body { height: 100%; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-weight: 400;
  font-feature-settings: "cv11", "ss01";
  letter-spacing: .002em;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color .4s ease, color .4s ease;
}

::selection { background: var(--selection); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 99px;
  border: 3px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

/* ============ 网格背景 ============ */
.grid-bg {
  position: fixed;
  inset: -64px;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: 0 0;
  animation: gridMove 3s linear infinite;
  transition: background-image .4s ease;
}
@keyframes gridMove {
  from { background-position: 0 0; }
  to   { background-position: 32px 32px; }
}

.grid-mask {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(
    ellipse at center,
    transparent 0%,
    transparent 22%,
    rgb(var(--bg-rgb) / 0.25) 45%,
    rgb(var(--bg-rgb) / 0.7) 68%,
    rgb(var(--bg-rgb) / 0.95) 86%,
    rgb(var(--bg-rgb) / 1) 100%
  );
  transition: background .4s ease;
}

/* ============ 主题切换按钮 ============ */
.theme-toggle {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 20;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-solid);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--text);
  cursor: pointer;
  overflow: hidden;
  transition: border-color .3s, background .4s, transform .3s cubic-bezier(.2,.8,.2,1),
              box-shadow .3s;
  animation: fadeDown .7s cubic-bezier(.2, .8, .2, 1) both;
}
.theme-toggle:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -14px var(--card-shadow);
}
.theme-toggle:active { transform: translateY(0) scale(.94); }

.theme-toggle svg {
  position: absolute;
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .5s cubic-bezier(.4, 0, .2, 1), opacity .35s ease;
}

[data-theme="light"] .icon-sun  { transform: rotate(0deg)   scale(1); opacity: 1; }
[data-theme="light"] .icon-moon { transform: rotate(90deg)  scale(0); opacity: 0; }
[data-theme="dark"]  .icon-sun  { transform: rotate(-90deg) scale(0); opacity: 0; }
[data-theme="dark"]  .icon-moon { transform: rotate(0deg)   scale(1); opacity: 1; }

/* ============ 通用按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-solid);
  color: var(--text);
  font-size: 13.5px;
  font-weight: 500;
  font-family: inherit;
  letter-spacing: .01em;
  cursor: pointer;
  text-decoration: none;
  transition: all .25s cubic-bezier(.2, .8, .2, 1);
  white-space: nowrap;
}
.btn:hover {
  border-color: var(--border-hover);
  background: var(--card-hover);
  transform: translateY(-1px);
}
.btn:active { transform: translateY(0) scale(.97); }

.btn-primary {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  box-shadow: 0 10px 24px -12px var(--card-shadow);
}
[data-theme="dark"] .btn-primary { color: #0b1120; }
.btn-primary:hover {
  filter: brightness(1.05);
  border-color: transparent;
}

.btn-danger {
  color: var(--danger);
  border-color: var(--border);
}
.btn-danger:hover {
  color: #fff;
  background: var(--danger-hover);
  border-color: transparent;
}

.btn-ghost {
  background: transparent;
}

/* ============ 图标容器（通用逻辑） ============ */
.icon {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 15px;
  background: var(--icon-bg);
  overflow: hidden;
  transition: transform .35s cubic-bezier(.2, .8, .2, 1), background .4s ease;
}

.icon-unknown {
  color: var(--icon-unknown);
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: opacity .3s ease;
}

.icon-img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  object-fit: contain;
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}

.icon.has-img .icon-unknown { opacity: 0; }
.icon.has-img .icon-img { opacity: 1; }

/* ============ 空状态 ============ */
.empty {
  grid-column: 1 / -1;
  padding: 48px 20px;
  text-align: center;
  color: var(--placeholder);
  font-size: 13.5px;
  font-weight: 300;
  letter-spacing: .04em;
  border: 1px dashed var(--border);
  border-radius: 16px;
}

/* ============ 关键帧 ============ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(26px) scale(.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: .4; transform: scale(.7); }
}
@keyframes shine { to { background-position: -220% 0; } }

/* ============ 响应式 ============ */
@media (max-width: 640px) {
  .theme-toggle { top: 14px; right: 14px; width: 38px; height: 38px; }
  .theme-toggle svg { width: 16px; height: 16px; }
  .grid-mask {
    background: radial-gradient(
      ellipse at center,
      transparent 0%,
      transparent 14%,
      rgb(var(--bg-rgb) / 0.3) 38%,
      rgb(var(--bg-rgb) / 0.75) 62%,
      rgb(var(--bg-rgb) / 0.95) 82%,
      rgb(var(--bg-rgb) / 1) 100%
    );
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .grid-bg { animation: none !important; }
}