/* 默认: 夜间模式 (Dark Mode) */
:root {
    --bg-color: #0d1117;
    --container-bg: #161b22;
    --text-color: #c9d1d9;
    --text-color-muted: #8b949e;
    --primary-color: #58a6ff;
    --primary-hover-color: #79c0ff;
    --border-color: #30363d;
    --output-bg: #010409;
    --button-bg: #21262d;
    --button-hover-bg: #30363d;
    --success-color: #238636;
    --notice-text: #d29922;
    --notice-bg: rgba(210, 153, 34, 0.1);
    --notice-border: rgba(210, 153, 34, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 12px rgba(88, 166, 255, 0.3);
}

/* 日间模式 (Light Mode) */
body.light-mode {
    --bg-color: #f6f8fa;
    --container-bg: #ffffff;
    --text-color: #24292f;
    --text-color-muted: #57606a;
    --primary-color: #0969da;
    --primary-hover-color: #0a60c8;
    --border-color: #d0d7de;
    --output-bg: #f6f8fa;
    --button-bg: #f6f8fa;
    --button-hover-bg: #eef1f4;
    --success-color: #1a7f37;
    --notice-text: #9a6700;
    --notice-bg: #fff8c5;
    --notice-border: #f2c600;
    --shadow-color: rgba(140, 149, 159, 0.2);
    --shadow-glow: 0 0 12px rgba(9, 105, 218, 0.3);
}

/* --- 全局与基础样式 --- */
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    background-color: var(--bg-color);
    background-image: 
        linear-gradient(rgba(110, 118, 129, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(110, 118, 129, 0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    color: var(--text-color);
    margin: 0;
    padding: 2.5rem 1rem;
    display: flex;
    justify-content: center;
    line-height: 1.7;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100%;
    max-width: 900px;
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem 3rem;
    box-shadow: 0 8px 24px var(--shadow-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* --- 头部 --- */
header {
    text-align: center;
    margin-bottom: 2.5rem;
}
header h1 {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: 1px;
    transition: color 0.3s ease;
}
header .subtitle {
    font-size: 1.1rem;
    color: var(--text-color-muted);
    transition: color 0.3s ease;
}

/* --- 控制区 --- */
.controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}
#select-folder-btn {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}
body.light-mode #select-folder-btn {
    color: white;
}
#select-folder-btn:hover {
    background-color: var(--primary-hover-color);
    box-shadow: var(--shadow-glow);
}
#select-folder-btn:disabled {
    background-color: var(--button-bg);
    color: var(--text-color-muted);
    cursor: not-allowed;
    box-shadow: none;
}
#exclude-input {
    flex-grow: 1;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.7rem 1rem;
    transition: all 0.2s ease;
}
#exclude-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 25%, transparent);
}
footer {
    text-align: center;
    margin-top: 3rem;
    padding: 1rem;
    color: #777;
    font-size: 0.9rem;
}

/* --- 结果区 --- */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}
.results-header h2 {
    margin: 0; 
    font-size: 1.5rem; 
    font-weight: 500;
}
.view-controls-panel {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-grow: 1;
    flex-wrap: wrap;
}
.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.control-group-wide {
    flex-grow: 1;
}
.control-group label { 
    font-size: 0.9rem; 
    color: var(--text-color-muted);
    white-space: nowrap;
}
.control-group input[type="number"] {
    width: 60px;
}
.control-group input { 
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.4rem 0.6rem;
    text-align: center;
    transition: all 0.2s ease;
}
.control-group-wide input {
    flex-grow: 1;
    text-align: left;
    padding-left: 0.8rem;
}
#copy-btn, .view-controls-panel button {
    background-color: var(--button-bg);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: auto;
}
#copy-btn:hover, .view-controls-panel button:hover {
    background-color: var(--button-hover-bg);
    border-color: var(--primary-color);
}
#copy-btn.copied {
    background-color: var(--success-color);
    color: white;
    border-color: var(--success-color);
}
.output-wrapper {
    background-color: var(--output-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}
#tree-output {
    margin: 0;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    font-size: 0.95rem;
    max-height: 450px;
    overflow: auto;
    white-space: pre;
}

/* --- 使用说明区 --- */
#info-section {
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    transition: border-color 0.3s ease;
}
#info-section article {
    margin-bottom: 2.5rem;
}
#info-section h2 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}
#info-section ul { padding-left: 1.5rem; }
#info-section ul li { margin-bottom: 0.5rem; }
#info-section ul ul { margin-top: 0.5rem; }

.notice {
    color: var(--notice-text); 
    background-color: var(--notice-bg);
    border: 1px solid var(--notice-border); 
    border-radius: 6px;
    padding: 1rem 1.5rem; 
    margin: 2rem 0;
    transition: all 0.3s ease;
}

/* --- 页脚 --- */
footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 1rem;
    color: var(--text-color-muted);
    transition: all 0.3s ease;
}
footer a {
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}

/* --- 主题切换按钮 --- */
#theme-toggle-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--container-bg);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    z-index: 1000;
    overflow: hidden;
}
#theme-toggle-btn:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}
#theme-toggle-btn .icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--primary-color);
    transition: opacity 0.3s, transform 0.3s;
}

/* 默认（夜间模式）下，月亮图标不可见 */
.icon-moon { display: none; }

/* 日间模式下，隐藏太阳，显示月亮 */
.light-mode .icon-sun { display: none; }
.light-mode .icon-moon { display: block; }