/* ============================================================
   common.css — 公共样式 + 黑/浅主题
   所有公式标签页共享的布局、控件、画布容器与主题变量。
   公式专属配色在各自 css 文件中通过 --accent 覆盖。
   ============================================================ */

:root {
    /* 主题色（默认黑色主题） */
    --bg-dark: #030306;
    --panel-bg: #090910;
    --canvas-bg: #020205;
    --ctrl-bg: rgba(0, 0, 0, 0.3);
    --ctrl-border: rgba(255, 255, 255, 0.05);
    --card-bg: rgba(255, 255, 255, 0.02);
    --selector-bg: #101020;
    --cyan: #00f3ff;
    --magenta: #ff00a0;
    --yellow: #ffea00;
    --gray-dim: #2a2a40;
    --text-muted: #6a6a8a;
    --text-main: #ffffff;
    --font-mono: 'Courier New', Courier, monospace;
    --glow-cyan: 0 0 12px rgba(0, 243, 255, 0.4);
    --glow-magenta: 0 0 12px rgba(255, 0, 160, 0.4);
    --shadow-panel: 0 10px 30px rgba(0,0,0,0.7);
}

/* 浅色主题覆盖 */
[data-theme="light"] {
    --bg-dark: #eef2fb;
    --panel-bg: #ffffff;
    --canvas-bg: #fbfcfe;
    --ctrl-bg: #f1f3f8;
    --ctrl-border: #e2e6ee;
    --card-bg: #f6f8fc;
    --selector-bg: #ffffff;
    --gray-dim: #d6dce8;
    --text-muted: #6b7280;
    --text-main: #1f2430;
    --cyan: #0091b5;
    --magenta: #c4007c;
    --yellow: #b97a00;
    --glow-cyan: 0 0 10px rgba(0, 145, 181, 0.3);
    --glow-magenta: 0 0 10px rgba(196, 0, 124, 0.25);
    --shadow-panel: 0 14px 40px rgba(31, 41, 64, 0.10);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-mono), sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    transition: background-color 0.4s ease, color 0.4s ease;
}

        header {
            text-align: center;
            margin: 20px 0 30px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            width: 100%;
            max-width: 1720px;
        }

/* 主题切换按钮 */
.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--selector-bg);
    border: 1px solid var(--gray-dim);
    color: var(--text-main);
    padding: 8px 16px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: bold;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s ease;
}
.theme-toggle:hover {
    border-color: var(--cyan);
    box-shadow: var(--glow-cyan);
    color: var(--cyan);
}

/* 顶部控制按钮组（主题切换 + 声音开关） */
.header-controls {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    gap: 8px;
}
/* 按钮组内的主题/声音按钮改为静态定位，横向排列 */
.header-controls .theme-toggle {
    position: static;
}

h1 {
    font-size: 2.2rem;
    letter-spacing: 6px;
    text-shadow: var(--glow-cyan);
    color: var(--text-main);
}
h1 span { color: var(--magenta); text-shadow: var(--glow-magenta); }

/* ===== 布局：侧边栏 + 内容区 ===== */
.layout {
    display: flex;
    width: 100%;
    max-width: 1720px;
    align-items: flex-start;
    gap: 24px;
}

/* 侧边栏导航（按物理大类分组） */
.sidebar {
    flex: 0 0 220px;
    position: sticky;
    top: 20px;
    background: var(--selector-bg);
    border: 1px solid var(--gray-dim);
    border-radius: 8px;
    padding: 16px 12px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.sidebar-title {
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--text-muted);
    text-transform: uppercase;
    padding: 0 8px 10px;
    border-bottom: 1px solid var(--gray-dim);
    margin-bottom: 12px;
}

.nav-group { margin-bottom: 14px; }
.nav-group:last-child { margin-bottom: 0; }

.nav-group-title {
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--cyan);
    padding: 4px 8px;
    margin-bottom: 4px;
    letter-spacing: 1px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    user-select: none;
}
.nav-group-toggle {
    display: inline-block;
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}
.nav-group.collapsed .nav-group-toggle {
    transform: rotate(-90deg);
}
.nav-group.collapsed .nav-item {
    display: none;
}

.nav-item {
    display: block;
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    border-left: 3px solid transparent;
    color: var(--text-muted);
    padding: 8px 10px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 0 4px 4px 0;
    transition: all 0.25s ease;
}
.nav-item:hover {
    color: var(--text-main);
    background: var(--ctrl-bg);
}
.nav-item.active {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: var(--ctrl-bg);
    box-shadow: var(--glow-cyan);
    font-weight: bold;
}

.content {
    flex: 1 1 auto;
    min-width: 0; /* 允许内部画布收缩，避免溢出 */
}

/* 窄屏：侧边栏移到顶部 */
@media (max-width: 760px) {
    .layout { flex-direction: column; }
    .sidebar {
        position: static;
        flex-basis: auto;
        width: 100%;
        max-height: none;
    }
}

/* 中等屏：画布与参数调节改为上下堆叠 */
@media (max-width: 1100px) {
    .canvas-container, .control-panel { flex: 1 1 100%; }
}

.viewport {
    width: 100%;
    max-width: 1480px;
    background: var(--panel-bg);
    border: 1px solid var(--gray-dim);
    box-shadow: var(--shadow-panel);
    border-radius: 8px;
    padding: 30px;
    display: none;
}

/* 视口内部：公式卡片占整行，画布与参数调节左右并排 */
.viewport.active {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    align-items: flex-start;
}

/* --- 动画画布与看板 --- */
.canvas-container {
    flex: 1 1 600px;
    width: 100%;
    background: var(--canvas-bg);
    border: 1px dashed var(--accent, var(--gray-dim));
    border-radius: 4px;
    margin-bottom: 0;
    position: relative;
    overflow: hidden;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

canvas {
    display: block;
    width: 100%;
    height: 720px;
}

/* 公式卡片：左侧强调色由各公式 css 通过 --accent 指定 */
.formula-card {
    flex: 0 0 100%;
    background: var(--card-bg);
    border-left: 4px solid var(--accent, var(--magenta));
    padding: 15px;
    margin-bottom: 0;
    font-size: 1.1rem;
}

.formula-text {
    font-size: 1.4rem;
    color: var(--yellow);
    text-shadow: 0 0 8px rgba(255, 234, 0, 0.3);
    margin-bottom: 8px;
}

/* --- 交互控制区（演示区右侧） --- */
.control-panel {
    flex: 0 0 300px;
    background: var(--ctrl-bg);
    border: 1px solid var(--ctrl-border);
    padding: 15px;
    border-radius: 4px;
}

.control-group {
    margin-bottom: 15px;
}
.control-group:last-child { margin-bottom: 0; }

.control-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 5px;
}

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

input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    background: var(--gray-dim);
    height: 6px;
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: var(--glow-cyan);
    cursor: pointer;
}

.action-btn {
    width: 100%;
    background: transparent;
    border: 1px solid var(--cyan);
    color: var(--cyan);
    padding: 12px;
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.2s ease;
    margin-top: 15px;
}
.action-btn:hover {
    background: rgba(0, 243, 255, 0.1);
    box-shadow: var(--glow-cyan);
}

/* --- 读数卡片：标签左、数值右，避免文字堆叠 --- */
.readout-card {
    background: var(--card-bg);
    border: 1px solid var(--ctrl-border);
    border-radius: 8px;
    padding: 4px 12px;
    margin: 4px 0 12px;
    font-size: 0.92rem;
}
.readout-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 0;
    line-height: 1.4;
    border-bottom: 1px dashed var(--ctrl-border);
}
.readout-row:last-child { border-bottom: none; }
.readout-row .readout-label { color: var(--text-muted); }
.readout-row .readout-val {
    font-family: var(--font-mono);
    font-weight: bold;
}

/* ============================================================
   浅色主题专属美化（不影响黑色主题）
   ============================================================ */
[data-theme="light"] body {
    background-image: linear-gradient(135deg, #eef2fb 0%, #f6f8fc 45%, #fdfbfe 100%);
    background-attachment: fixed;
}

/* 标题：去掉荧光阴影，改为清晰渐变文字 */
[data-theme="light"] h1 {
    text-shadow: none;
    background: linear-gradient(90deg, #1f2430, #0091b5);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
[data-theme="light"] h1 span {
    background: linear-gradient(90deg, #c4007c, #0091b5);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* 主题切换按钮：浅色下更精致 */
[data-theme="light"] .theme-toggle {
    border-color: #d6dce8;
    box-shadow: 0 2px 8px rgba(31, 41, 64, 0.08);
}
[data-theme="light"] .theme-toggle:hover {
    border-color: var(--cyan);
    color: var(--cyan);
    box-shadow: 0 4px 14px rgba(0, 145, 181, 0.22);
}

/* 侧边栏与面板：浅色下更通透、加柔和阴影 */
[data-theme="light"] .sidebar,
[data-theme="light"] .viewport {
    border-color: #e2e6ee;
    box-shadow: 0 14px 40px rgba(31, 41, 64, 0.10);
}
[data-theme="light"] .nav-group-title {
    color: #0091b5;
}

/* 画布：纸感浅底，去掉虚线，改用柔和实线 + 内阴影 */
[data-theme="light"] .canvas-container {
    border: 1px solid #e2e6ee;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff 0%, #f5f8fc 100%);
    box-shadow: inset 0 1px 4px rgba(31, 41, 64, 0.05);
}

/* 公式卡片 / 读数卡片：浅色下更通透 */
[data-theme="light"] .formula-card {
    background: #f6f8fc;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(31, 41, 64, 0.04);
}
[data-theme="light"] .readout-card {
    background: #f6f8fc;
    box-shadow: 0 2px 10px rgba(31, 41, 64, 0.04);
}
[data-theme="light"] .readout-row {
    border-bottom-color: #e7ebf2;
}

/* 控制面板：浅色下更柔和 */
[data-theme="light"] .control-panel {
    background: #f3f5fa;
    border-color: #e2e6ee;
    box-shadow: 0 2px 10px rgba(31, 41, 64, 0.04);
}

/* 滑块：浅色下轨道更饱满、滑块头带白边与柔和投影 */
[data-theme="light"] input[type="range"] {
    background: #dfe4ee;
    box-shadow: inset 0 1px 2px rgba(31, 41, 64, 0.08);
}
[data-theme="light"] input[type="range"]::-webkit-slider-thumb {
    border: 2px solid #ffffff;
    box-shadow: 0 2px 6px rgba(0, 145, 181, 0.45);
}
[data-theme="light"] input[type="range"]::-moz-range-thumb {
    border: 2px solid #ffffff;
    background: var(--cyan);
    box-shadow: 0 2px 6px rgba(0, 145, 181, 0.45);
}

/* 操作按钮：浅色下改为渐变实心，更精致 */
[data-theme="light"] .action-btn {
    border-color: transparent;
    color: #ffffff;
    background: linear-gradient(180deg, #00a8d0, #0091b5);
    box-shadow: 0 4px 12px rgba(0, 145, 181, 0.28);
    border-radius: 6px;
}
[data-theme="light"] .action-btn:hover {
    background: linear-gradient(180deg, #00bcd4, #0091b5);
    box-shadow: 0 6px 18px rgba(0, 145, 181, 0.38);
}

/* --- 尊重"减少动效"系统偏好 --- */
@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}