/* 分形可视化 — 赛博朋克暗色主题 */

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

:root {
  --bg: #0a0a0f;
  --bg-panel: rgba(12, 12, 22, 0.92);
  --border: rgba(100, 130, 255, 0.15);
  --text: rgba(200, 210, 255, 0.85);
  --text-dim: rgba(200, 210, 255, 0.45);
  --accent: #6688ff;
  --accent-glow: rgba(100, 130, 255, 0.4);
  --gold: #ddaa33;
  --font: 'Consolas', 'Courier New', 'Microsoft YaHei', monospace;
  --nav-h: 42px;
  --panel-w: 260px;
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
}

/* ---- 导航栏 ---- */
#main-nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--bg-panel);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 4px;
  z-index: 1000;
  transition: opacity 0.3s;
}

#main-nav a {
  color: var(--text-dim);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 13px;
  transition: all 0.2s;
  white-space: nowrap;
}

#main-nav a:hover {
  color: var(--accent);
  background: rgba(100, 130, 255, 0.08);
  text-shadow: 0 0 8px var(--accent-glow);
}

#main-nav a.active {
  color: var(--accent);
  box-shadow: 0 2px 0 var(--accent);
}

.nav-brand {
  font-size: 15px !important;
  color: var(--text) !important;
  font-weight: bold;
  margin-right: 12px;
  letter-spacing: 1px;
}

/* ---- 主内容区 ---- */
#content {
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0; bottom: 0;
}

/* ---- 分形页面布局 ---- */
.fractal-page {
  display: flex;
  width: 100%; height: 100%;
}

.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.canvas-container canvas {
  display: block;
  width: 100%; height: 100%;
}

/* ---- 控制面板 ---- */
.control-panel {
  width: var(--panel-w);
  min-width: var(--panel-w);
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.control-panel h3 {
  font-size: 14px;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 4px;
}

.control-group { display: flex; flex-direction: column; gap: 4px; }

.control-group label {
  font-size: 12px;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

.control-group label span { color: var(--text); }

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  background: transparent;
}

.control-group input[type="text"],
.control-group input[type="number"],
.control-group select {
  background: rgba(20, 20, 40, 0.8);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 8px;
  border-radius: 3px;
  font-family: var(--font);
  font-size: 12px;
}

.btn {
  background: rgba(60, 80, 180, 0.25);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 12px;
  transition: all 0.2s;
}

.btn:hover {
  background: rgba(60, 80, 180, 0.45);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.btn-row { display: flex; gap: 6px; flex-wrap: wrap; }

.btn.active {
  background: rgba(60, 80, 180, 0.5);
  border-color: var(--accent);
}

/* ---- 信息覆盖层 ---- */
/* ---- 双缓冲图层（Julia/Mandelbrot 巡游） ---- */
.layer-canvas {
  position: absolute !important;
  top: 0; left: 0;
}

.info-overlay {
  position: absolute;
  left: 12px; bottom: 12px;
  z-index: 10;
  color: var(--text);
  font-size: 12px;
  line-height: 1.6;
  pointer-events: none;
  text-shadow: 0 0 6px rgba(0,0,0,0.9);
  background: rgba(0,0,0,0.5);
  padding: 6px 10px;
  border-radius: 4px;
}

.loading-overlay {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  color: var(--accent);
  font-size: 16px;
  pointer-events: none;
}

/* ---- 首页 ---- */
.home-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 40px 20px;
  overflow-y: auto;
}

.home-title {
  font-size: 28px;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: 3px;
}

.home-subtitle {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 36px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  max-width: 960px;
  width: 100%;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 20px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s;
  cursor: pointer;
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 28px;
  margin-bottom: 10px;
  display: block;
}

.card h3 {
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 6px;
}

.card p {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(100, 130, 255, 0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(100, 130, 255, 0.5); }