/* 通用變數 */
:root {
    --bg-color: #0b0e14;
    --card-bg: rgba(255, 255, 255, 0.05);
    --primary: #00f2ff;
    --secondary: #ff8c00;
    --accent: #bd00ff;
    --text-main: #e0e0e0;
    --text-dim: #a0a0a0;
    --glass-border: rgba(255, 255, 255, 0.1);
    --water-color: #1a2a44;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Noto Sans TC', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, .orbitron {
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 1px;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 span {
    color: var(--primary);
    text-shadow: 0 0 10px var(--primary);
}

.subtitle {
    color: var(--text-dim);
    font-size: 0.9rem;
}

#simulation-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
    flex: 1;
}

@media (max-width: 900px) {
    #simulation-container {
        grid-template-columns: 1fr;
    }
}

/* 模擬畫布區域 */
#canvas-wrapper {
    position: relative;
    background: linear-gradient(180deg, #10141d 0%, var(--water-color) 100%);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    min-height: 400px;
    cursor: crosshair;
}

#simCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

#stats-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    pointer-events: none;
}

.stat-item {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-bottom: 0.3rem;
}

.stat-item.highlighted {
    color: var(--accent);
    font-weight: bold;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 0.3rem;
    margin-top: 0.3rem;
}

/* 控制面板 */
#controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.control-group h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--primary);
    border-left: 3px solid var(--primary);
    padding-left: 10px;
}

.input-wrap {
    margin-bottom: 1.2rem;
}

.input-wrap label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--text-dim);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
    background: rgba(255, 255, 255, 0.1);
    height: 6px;
    border-radius: 3px;
    outline: none;
}

.btn-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

button {
    padding: 0.8rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.btn-primary {
    background: var(--primary);
    color: #000;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 15px var(--primary);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.toggle-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* Switch Styles */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.1);
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.slider.round {
  border-radius: 20px;
}

.slider.round:before {
  border-radius: 50%;
}

.formula-box {
    background: rgba(0, 0, 0, 0.3);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px dashed var(--glass-border);
}

.formula-box h3 {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--text-dim);
}

.math {
    font-size: 0.95rem;
    overflow-x: auto;
    color: var(--primary);
}

.hint {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin: 10px 0 5px;
}

footer {
    text-align: center;
    padding-top: 2rem;
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* 動畫效果 */
@keyframes glow {
    0% { filter: drop-shadow(0 0 2px var(--primary)); }
    100% { filter: drop-shadow(0 0 8px var(--primary)); }
}