:root {
    --bg-color: #05060b;
    --card-bg: #0e111f;
    --text-color: #f1f5f9;
    --text-muted: #475569;
    --accent-color: #38bdf8;
    --border-color: #1a1f38;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background-color: var(--bg-color); color: var(--text-color); line-height: 1.6; -webkit-font-smoothing: antialiased; }
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 24px; }

header { background-color: rgba(14, 17, 31, 0.9); backdrop-filter: blur(15px); border-bottom: 1px solid var(--border-color); padding: 20px 0; position: sticky; top: 0; z-index: 100; }
.header-container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 900; color: #fff; text-decoration: none; background: linear-gradient(135deg, #38bdf8, #a855f7, #f43f5e); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
nav a { color: #64748b; text-decoration: none; margin-left: 24px; font-weight: 600; font-size: 0.95rem; transition: color 0.2s; }
nav a:hover, nav a.active { color: var(--accent-color); }

main { padding: 60px 0; }
.tool-section { text-align: center; margin-bottom: 60px; }
.tool-section h1 { font-size: 3.2rem; color: #fff; margin-bottom: 15px; font-weight: 900; letter-spacing: -0.03em; }
.subtitle { color: #64748b; font-size: 1.2rem; margin-bottom: 60px; max-width: 700px; margin-left: auto; margin-right: auto; }

/* 顶级通知栏 */
.toast-message {
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(-30px);
    background: linear-gradient(135deg, #38bdf8, #ec4899);
    color: #fff;
    padding: 14px 40px;
    border-radius: 50px;
    font-weight: 800;
    box-shadow: 0 20px 40px rgba(56, 189, 248, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}
.toast-message.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 分类块 */
.symbol-category { background-color: var(--card-bg); border: 1px solid var(--border-color); padding: 35px; border-radius: 24px; margin-bottom: 40px; text-align: left; box-shadow: 0 10px 30px rgba(0,0,0,0.3); }
.symbol-category h3 { font-size: 1.2rem; color: #f1f5f9; margin-bottom: 25px; border-left: 5px solid var(--accent-color); padding-left: 15px; font-weight: 800; letter-spacing: 0.5px; }

/* 极速网格 */
.symbol-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 14px; }
.symbol-grid-text { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }

/* 按钮点击触感反馈 */
.sym-btn { background-color: var(--bg-color); border: 1px solid var(--border-color); color: #fff; font-size: 2rem; padding: 18px; border-radius: 16px; cursor: pointer; transition: all 0.1s ease; display: flex; justify-content: center; align-items: center; }
.sym-btn.text-face { font-size: 1.1rem; font-family: monospace; padding: 20px 10px; font-weight: 600; }
.sym-btn:hover { background: linear-gradient(135deg, #38bdf8, #818cf8); border-color: transparent; color: #05060b; transform: translateY(-5px); box-shadow: 0 12px 25px rgba(56, 189, 248, 0.3); }

/* 组合模板专区 */
.templates-section { margin-top: 80px; text-align: left; }
.templates-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: 10px; color: #fff; }
.sub-section-title { color: #64748b; margin-bottom: 30px; font-size: 1.1rem; }
.template-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.template-card { background-color: var(--card-bg); border: 1px solid var(--border-color); padding: 22px; border-radius: 16px; color: #cbd5e1; font-family: monospace; font-size: 1.05rem; cursor: pointer; transition: all 0.15s ease; border-right: 4px solid #ec4899; }
.template-card:hover { background-color: #1e2238; color: #fff; transform: translateX(5px); }

/* 殿堂级SEO内容样式 */
.seo-section { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 24px; padding: 55px; text-align: left; margin-top: 80px; border-top: 6px solid #a855f7; }
.seo-section h2 { font-size: 2rem; color: #fff; margin-bottom: 30px; font-weight: 900; letter-spacing: -0.01em; }
.article-body h3 { font-size: 1.4rem; color: #f8fafc; margin: 40px 0 15px 0; font-weight: 800; }
.article-body p { color: #94a3b8; margin-bottom: 22px; font-size: 1.1rem; line-height: 1.8; }
.article-body code { background-color: var(--bg-color); color: #f43f5e; padding: 4px 10px; border-radius: 6px; font-family: monospace; font-size: 1rem; border: 1px solid var(--border-color); }

footer { text-align: center; padding: 60px 0; color: #334155; font-size: 1rem; border-top: 1px solid var(--border-color); margin-top: 100px; }

/* 全球移动端极致自适应 */
@media(max-width: 600px) {
    .tool-section h1 { font-size: 2.2rem; }
    .symbol-category { padding: 24px 16px; border-radius: 16px; }
    .symbol-grid { grid-template-columns: repeat(auto-fill, minmax(65px, 1fr)); gap: 10px; }
    .sym-btn { font-size: 1.6rem; padding: 14px; }
    .symbol-grid-text { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .template-grid { grid-template-columns: 1fr; }
    .seo-section { padding: 30px 20px; }
}