/* --- 全局视觉规范 --- */
:root {
    --primary: #4361ee;
    --accent: #4cc9f0;
    --bg: #f8f9fa;
    --card-white: #ffffff;
    --text: #2b2d42;
    --muted: #8d99ae;
    --shadow: 0 10px 30px rgba(0,0,0,0.05);
    --border: rgba(0,0,0,0.05);
    --note-bg: #f1f4f9;
}

[data-theme="dark"] {
    --bg: #121212;
    --card-white: #1e1e1e;
    --text: #f8f9fa;
    --muted: #9ca3af;
    --shadow: 0 10px 30px rgba(0,0,0,0.4);
    --border: rgba(255,255,255,0.1);
    --note-bg: #2d2d2d;
}

/* 🌟 核心修正：防止水平溢出 */
* {
    box-sizing: border-box; /* 确保 padding 不会撑开容器宽度 */
}

/* 🌟 入场动画 */
@keyframes pageReveal {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 🌟 绿色呼吸灯动画 */
@keyframes statusPulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* 🌟 全局过渡控制 */
body, .tool-card, .tool-main-box, .info-section, .info-note, input, h1, h2, .lang-switcher, #theme-toggle, footer {
    transition: background-color 0.3s ease, 
                color 0.3s ease, 
                border-color 0.3s ease, 
                box-shadow 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 20px 15px 60px; 
    animation: pageReveal 0.4s ease-out;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden; /* 彻底杜绝左右滑动 */
}

/* --- 顶部控制栏布局 --- */
.header-controls {
    width: 100%;
    max-width: 900px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 10px auto 20px;
    gap: 10px;
}

/* --- 1. Home 按钮强化 (解决纤细问题) --- */
.nav-home {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text);
    transition: 0.2s ease;
    padding: 8px 16px;
    border-radius: 12px;
    background: var(--card-white);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    min-width: 100px; /* 确保视觉上的厚实感 */
    flex-shrink: 0;   /* 防止在窄屏下被挤压变形 */
}

.nav-home .icon { font-size: 1.1rem; }
.nav-home .text { 
    font-size: 0.9rem; 
    font-weight: 700; /* 加粗文字，解决纤细问题 */
}

.nav-home:hover {
    color: var(--primary);
    transform: translateY(-2px);
    border-color: var(--primary);
}

/* --- 品牌头部展示 --- */
.brand-header {
    text-align: center;
    margin-bottom: 40px;
    width: 100%;
}

h1 {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
    font-size: clamp(2rem, 8vw, 2.8rem); 
    margin: 0;
    letter-spacing: -1.5px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.05));
}

.brand-subtitle {
    font-size: 0.85rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 5px;
    font-weight: 500;
}

/* --- 药丸盒语言切换器 --- */
.lang-switcher {
    display: flex;
    background: var(--note-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 3px;
    flex-shrink: 0;
}

.lang-switcher button {
    width: auto; 
    padding: 6px 15px;
    background: transparent;
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 700; 
    border-radius: 9px;
    transition: all 0.2s ease;
}

html[data-lang="en"] #btn-en,
html[data-lang="zh"] #btn-zh {
    background: var(--primary);
    color: white !important;
}

/* --- 主题切换按钮 --- */
#theme-toggle {
    width: auto;
    background: var(--card-white);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    border-radius: 12px;
    box-shadow: var(--shadow);
    cursor: pointer;
    flex-shrink: 0;
}

/* --- 2. 容器自适应修正 (解决手机端显示不全) --- */
.tool-main-box {
    background: var(--card-white);
    padding: 30px 20px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    width: 100%; /* 关键：宽度自适应 */
    max-width: 480px;
    margin-bottom: 30px;
}

.menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    width: 100%;
    max-width: 900px;
}

.tool-card {
    background: var(--card-white);
    padding: 40px 25px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    text-decoration: none;
    color: inherit;
    text-align: center;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

/* 基础交互元素 */
button {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.1s ease;
}

input {
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    background: var(--card-white);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    outline: none;
    font-size: 1rem;
}

/* 信息板块自适应 */
.info-section {
    max-width: 800px;
    width: 100%; 
    margin: 40px auto 20px;
    background: var(--card-white);
    padding: 30px 20px;
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.info-title {
    color: var(--text);
    font-size: 1.3rem;
    font-weight: 700;
    border-left: 5px solid var(--primary); 
    padding-left: 15px;
    margin-bottom: 15px;
}

.info-note {
    padding: 20px;
    background: var(--note-bg); 
    border-radius: 16px;
    font-size: 0.9rem;
    color: var(--muted);
    line-height: 1.6;
}

/* 绿色呼吸灯状态 */
.status {
    font-size: 0.7rem;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(52, 211, 153, 0.1); 
    color: #10b981;
    font-weight: 700;
    display: inline-block;
    animation: statusPulse 2.5s infinite ease-in-out; 
}

/* --- 极简页脚控制：统一高级灰 --- */
footer {
    margin-top: 60px;
    text-align: center;
    width: 100%;
    max-width: 900px;
    padding: 30px 10px;
    border-top: 1px solid var(--border);
}

.footer-copy {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px; /* 两行之间的间距 */
}

.footer-copy p {
    /* 核心修改：使用你喜欢的灰色变量，并去掉强制黑色 */
    color: var(--muted) !important; 
    font-size: 0.75rem;
    margin: 0;
    font-weight: 400;
    white-space: nowrap; /* 确保不换行 */
}

/* 品牌名加粗也保持灰色，防止变黑 */
.footer-copy strong {
    color: var(--muted);
    font-weight: 600;
}

/* 第二行：字号稍微大一点，颜色和上面完全一样 */
.footer-copy .footer-note {
    font-size: 0.85rem; 
    opacity: 0.9; /* 稍微增加一点点通透感，匹配原版风格 */
}

/* 暗黑模式下，变量 --muted 会自动变浅，所以无需额外写颜色 */
[data-theme="dark"] .footer-copy p {
    opacity: 0.7; /* 暗黑模式下稍微降点亮度，不刺眼 */
}

.footer-links a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.85rem;
    margin: 0 10px;
}

/* --- 移动端强制并排适配 --- */
@media (max-width: 480px) {
    h1 { font-size: 2.1rem; }
    
    .header-controls { 
        flex-wrap: nowrap; /* 绝对禁止换行 */
        gap: 5px; /* 极窄间距确保挤在同一行 */
        padding: 0;
    }
    
    .nav-home {
        min-width: 80px; /* 手机端适度缩小，但保持 700 字重 */
        padding: 8px 10px;
    }
    
    .nav-home .text {
        font-size: 0.85rem;
    }

    .lang-switcher button {
        padding: 6px 10px;
        font-size: 0.75rem;
    }

    #theme-toggle {
        padding: 8px 10px;
        font-size: 0.8rem;
    }

    /* 再次确认容器不会溢出 */
    .tool-main-box, .info-section {
        padding: 25px 15px;
        width: 100% !important;
    }
}