/* ================= style.css ================= */
/* 全局 CSS 变量 (支持黑夜模式) */
:root {
    --bg-color: #FAFAFA;
    --text-main: #111111;
    --text-muted: #555555;
    --accent: #000000;
    --accent-text: #FFFFFF;
    --card-bg: #FFFFFF;
    --card-border: rgba(0,0,0,0.04);
    --header-bg: rgba(250, 250, 250, 0.85);
    --support-bg: #111111;
    --support-text: #FFFFFF;
    --tips-bg: rgba(255,255,255,0.1);
    --btn-outline-border: #111111;
}[data-theme="dark"] {
    --bg-color: #121212;
    --text-main: #F9FAFB;
    --text-muted: #9CA3AF;
    --accent: #FFFFFF;
    --accent-text: #000000;
    --card-bg: #1E1E1E;
    --card-border: rgba(255,255,255,0.05);
    --header-bg: rgba(18, 18, 18, 0.85);
    --support-bg: #1E1E1E;
    --support-text: #F9FAFB;
    --tips-bg: rgba(255,255,255,0.05);
    --btn-outline-border: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Outfit', sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.6; overflow-x: hidden; transition: background-color 0.3s, color 0.3s; }
a { text-decoration: none; color: inherit; }

/* 顶部导航栏 */
header { position: fixed; top: 0; width: 100%; padding: 1.2rem 5%; display: flex; justify-content: space-between; align-items: center; background: var(--header-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); z-index: 1000; border-bottom: 1px solid var(--card-border); transition: background 0.3s; }
.logo { font-size: 1.5rem; font-weight: 800; letter-spacing: 2px; text-transform: uppercase; }
.nav-links { display: flex; gap: 2.5rem; font-weight: 600; font-size: 0.95rem; align-items: center; }
.nav-links a { position: relative; padding-bottom: 4px; }
.nav-links a::after { content: ''; position: absolute; width: 0; height: 2px; bottom: 0; left: 0; background-color: var(--text-main); transition: width 0.3s ease; }
.nav-links a:hover::after { width: 100%; }

/* 主页 Hero */
.hero { min-height: 90vh; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 6rem 5% 0; background: radial-gradient(circle at top, var(--card-bg), var(--bg-color)); }
.hero h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); font-weight: 800; line-height: 1.1; margin-bottom: 1.5rem; max-width: 900px; }
.hero p { font-size: clamp(1.1rem, 2vw, 1.3rem); color: var(--text-muted); max-width: 650px; font-weight: 400; margin-bottom: 2.5rem; }

/* 基础大按钮样式 */
.btn-group { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background-color: var(--accent); color: var(--accent-text); padding: 1rem 2.5rem; border-radius: 50px; font-weight: 600; font-size: 1rem; transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s, color 0.3s; border: 2px solid var(--accent); cursor: pointer; }
.btn:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
.btn-outline { background-color: transparent; color: var(--text-main); border-color: var(--btn-outline-border); }
.btn-outline:hover { background-color: var(--text-main); color: var(--bg-color); }

/* 通用区块排版 */
.section-padding { padding: 6rem 5%; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-header h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 1rem; }
.section-header p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

/* ======= 品牌矩阵 (Bento Grid) ======= */
.brands-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 2rem; max-width: 1200px; margin: 0 auto; }
.brand-card { background-color: var(--card-bg); border-radius: 24px; padding: 3rem; display: flex; flex-direction: column; justify-content: space-between; align-items: flex-start; transition: transform 0.4s ease, box-shadow 0.4s ease; box-shadow: 0 4px 20px rgba(0,0,0,0.02); border: 1px solid var(--card-border); }
.brand-card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px rgba(0,0,0,0.06); }
.brand-card h3 { font-size: 2rem; font-weight: 800; margin-bottom: 1rem; width: 100%; }
.brand-card p { color: var(--text-muted); font-weight: 400; font-size: 1.1rem; width: 100%; margin-bottom: 0; }

/* 灵活网格尺寸 (用于未来随意扩展品牌) */
.span-12 { grid-column: span 12; }
.span-8  { grid-column: span 8; }
.span-7  { grid-column: span 7; }
.span-6  { grid-column: span 6; }
.span-5  { grid-column: span 5; }
.span-4  { grid-column: span 4; }

/* ======= 全渠道店铺与社媒矩阵预留 (全新添加) ======= */
.brand-actions { margin-top: 2rem; display: flex; flex-direction: column; gap: 1rem; width: 100%; }
.action-row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }

/* 平台胶囊按钮 */
.brand-btn { 
    display: inline-flex; align-items: center; gap: 4px; padding: 0.5rem 1rem; 
    border-radius: 50px; border: 1px solid var(--text-main); color: var(--text-main); 
    font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; 
    transition: all 0.3s ease; background-color: transparent;
}
.brand-btn svg { width: 14px; height: 14px; transition: transform 0.3s ease; }
.brand-btn:hover { background-color: var(--text-main); color: var(--bg-color); transform: translateY(-2px); }
.brand-btn:hover svg { transform: translateX(3px); }

/* 社媒圆形图标按钮 */
.social-btn {
    display: inline-flex; justify-content: center; align-items: center;
    width: 34px; height: 34px; border-radius: 50%; border: 1px solid rgba(0,0,0,0.1);
    color: var(--text-main); transition: all 0.3s ease; background: var(--card-bg);
}
[data-theme="dark"] .social-btn { border-color: rgba(255,255,255,0.1); }
.social-btn svg { width: 16px; height: 16px; fill: currentColor; }
.social-btn:hover { border-color: var(--text-main); transform: translateY(-2px); }

/* 旗舰品牌专有的深色反转逻辑 */
.sanhion { background: linear-gradient(135deg, #111 0%, #2a2a2a 100%); color: white; border: none; }
.sanhion h3 { color: white; }
.sanhion p { color: rgba(255,255,255,0.85); max-width: 700px; }
.sanhion .brand-btn { border-color: rgba(255,255,255,0.6); color: #FFFFFF; }
.sanhion .brand-btn:hover { background-color: #FFFFFF; color: #111111; }
.sanhion .social-btn { background: transparent; border-color: rgba(255,255,255,0.3); color: #FFFFFF; }
.sanhion .social-btn:hover { border-color: #FFFFFF; }

/* 未来品牌虚线框特化样式 */
.future-placeholder { border: 2px dashed var(--text-muted); background: transparent; box-shadow: none; align-items: center; text-align: center; opacity: 0.6; }
.future-placeholder:hover { transform: none; box-shadow: none; opacity: 1; border-color: var(--text-main); }

/* 支持与售后区块 */
.support-section { background-color: var(--support-bg); color: var(--support-text); text-align: center; padding: 5rem 5%; border-radius: 30px; max-width: 1000px; margin: 0 auto 4rem auto; box-shadow: 0 20px 40px rgba(0,0,0,0.1); transition: background-color 0.3s; }
.support-section h2 { font-size: 2.5rem; margin-bottom: 1.5rem; font-weight: 800; }
.support-section p { margin-bottom: 2rem; color: #a3a3a3; font-size: 1.1rem; max-width: 600px; margin: auto; }
.support-tips { background: var(--tips-bg); border-radius: 12px; padding: 1.5rem; margin: 0 auto 2.5rem auto; max-width: 550px; text-align: left; font-size: 0.95rem; border: 1px solid rgba(255,255,255,0.05); }
.support-tips ul { list-style-type: none; margin-top: 0.5rem; color: #d4d4d4;}
.support-tips li { margin-bottom: 0.5rem; display: flex; align-items: center; gap: 8px;}
.support-tips li::before { content: "✓"; color: #4ade80; font-weight: bold; }
.btn-light { background-color: var(--support-text); color: var(--support-bg); border-color: var(--support-text); }
.btn-light:hover { background-color: transparent; color: var(--support-text); border-color: var(--support-text); }

/* 子页面专属样式 */
.page-header { padding: 10rem 5% 4rem; text-align: center; background: var(--card-bg); border-bottom: 1px solid var(--card-border); transition: background-color 0.3s; }
.page-header h1 { font-size: 3.5rem; font-weight: 800; margin-bottom: 1rem; }
.content-section { max-width: 800px; margin: 0 auto; padding: 4rem 5%; font-size: 1.1rem; line-height: 1.8; color: var(--text-muted); }
.content-section h2 { color: var(--text-main); margin: 2.5rem 0 1rem; font-size: 1.8rem; font-weight: 800; }
.content-section p { margin-bottom: 1.5rem; }

/* 底部 Footer */
footer { padding: 4rem 5% 2rem; border-top: 1px solid var(--card-border); color: var(--text-muted); font-size: 0.95rem; background-color: var(--card-bg); transition: background-color 0.3s; }
.footer-content { display: flex; flex-wrap: wrap; justify-content: space-between; max-width: 1200px; margin: 0 auto; gap: 2rem; margin-bottom: 3rem; }
.footer-brand { max-width: 300px; }
.footer-brand h4 { font-size: 1.2rem; color: var(--text-main); font-weight: 800; margin-bottom: 1rem; }
.footer-links { display: flex; gap: 4rem; }
.footer-col h5 { font-size: 1rem; color: var(--text-main); font-weight: 600; margin-bottom: 1.2rem; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.8rem; }
.footer-col ul a { transition: color 0.3s; }
.footer-col ul a:hover { color: var(--text-main); }
.footer-bottom { text-align: center; border-top: 1px solid var(--card-border); padding-top: 2rem; font-size: 0.85rem; }

/* 悬浮按钮组 */
.floating-actions { position: fixed; bottom: 2rem; right: 2rem; display: flex; flex-direction: column; gap: 1rem; z-index: 999; }
.icon-btn { width: 45px; height: 45px; border-radius: 50%; background-color: var(--card-bg); border: 1px solid var(--card-border); color: var(--text-main); display: flex; justify-content: center; align-items: center; cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.08); transition: all 0.3s ease; }
.icon-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 16px rgba(0,0,0,0.15); background-color: var(--text-main); color: var(--bg-color); }
.icon-btn svg { width: 20px; height: 20px; fill: currentColor; }
#backToTop { opacity: 0; pointer-events: none; transform: translateY(10px); }
#backToTop.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* 响应式 */
@media (max-width: 900px) {
    .nav-links { display: none; }
    /* 移动端强制所有品牌卡片占满全宽 */
    .span-12, .span-8, .span-7, .span-6, .span-5, .span-4 { grid-column: span 12; }
    .brand-card { padding: 2rem; }
    .hero h1 { font-size: 2.8rem; }
    .footer-links { flex-direction: column; gap: 2rem; }
    .footer-content { flex-direction: column; }
    .floating-actions { bottom: 1.5rem; right: 1.5rem; }
}