/* ============================================================
   qq-ui.css — theme1 设计系统（2026 改版）
   浅色主题 / 主内容宽度 1580px / 全断点响应式
   本文件是 theme1 唯一的公共样式，页面级微调写在各页 <style> 中
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
    /* 品牌色 */
    --qq-primary: #2563eb;
    --qq-primary-hover: #1d4ed8;
    --qq-primary-light: #eff6ff;
    --qq-accent: #06b6d4;
    --qq-gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --qq-gradient-soft: linear-gradient(160deg, #eef4ff 0%, #f4fbfe 60%, #ffffff 100%);
    /* 文字 */
    --qq-heading: #0f172a;
    --qq-text: #334155;
    --qq-muted: #64748b;
    /* 背景/边框 */
    --qq-bg: #ffffff;
    --qq-bg-alt: #f6f9fe;
    --qq-border: #e2e8f0;
    --qq-card-shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .05);
    --qq-card-shadow-hover: 0 4px 12px rgba(37, 99, 235, .10), 0 16px 40px rgba(15, 23, 42, .08);
    /* 语义色 */
    --qq-success: #16a34a;
    --qq-warning: #d97706;
    --qq-danger: #dc2626;
    /* 尺寸 */
    --qq-radius: 12px;
    --qq-radius-sm: 8px;
    --qq-max-width: 1580px;
    --qq-nav-height: 68px;
}

/* ---------- 基础重置 ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--qq-text);
    background: var(--qq-bg);
    min-width: 320px;
}

img { max-width: 100%; height: auto; border: 0; vertical-align: middle; }

a { color: var(--qq-primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--qq-primary-hover); }

ul, ol { list-style: none; }

h1, h2, h3, h4, h5 { color: var(--qq-heading); line-height: 1.35; font-weight: 600; }

button, input, select, textarea { font: inherit; color: inherit; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 布局容器 ---------- */
.qq-container {
    width: min(var(--qq-max-width), 100% - 48px);
    margin-inline: auto;
}

.qq-section { padding: 72px 0; }
.qq-section--alt { background: var(--qq-bg-alt); }
.qq-section--tight { padding: 48px 0; }

.qq-section-head { text-align: center; margin: 0 auto 48px; }
.qq-section-title { font-size: 32px; letter-spacing: .5px; }
.qq-section-sub { margin-top: 12px; color: var(--qq-muted); font-size: 16px; }

/* ---------- 栅格 ---------- */
.qq-grid { display: grid; gap: 24px; }
.qq-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.qq-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.qq-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 卡片 ---------- */
.qq-card {
    background: #fff;
    border: 1px solid var(--qq-border);
    border-radius: var(--qq-radius);
    padding: 28px;
    box-shadow: var(--qq-card-shadow);
    transition: box-shadow .25s, transform .25s, border-color .25s;
}
.qq-card--hover:hover {
    box-shadow: var(--qq-card-shadow-hover);
    transform: translateY(-4px);
    border-color: rgba(37, 99, 235, .35);
}

/* 特性卡（图标 + 标题 + 描述） */
.qq-feature-icon {
    width: 52px; height: 52px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 14px;
    background: var(--qq-gradient);
    color: #fff;
    margin-bottom: 18px;
    flex: none;
}
.qq-feature-icon svg { width: 26px; height: 26px; fill: currentColor; }
.qq-feature-title { font-size: 18px; margin-bottom: 8px; }
.qq-feature-desc { color: var(--qq-muted); font-size: 14px; }

/* 数字统计 */
.qq-stat { text-align: center; }
.qq-stat-num {
    font-size: 40px; font-weight: 700;
    background: var(--qq-gradient);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}
.qq-stat-label { margin-top: 6px; color: var(--qq-heading); font-weight: 500; }
.qq-stat-tip { margin-top: 2px; color: var(--qq-muted); font-size: 13px; }

/* ---------- 按钮 ---------- */
.qq-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: 42px; padding: 0 26px;
    border-radius: var(--qq-radius-sm);
    border: 1px solid transparent;
    font-size: 15px; font-weight: 500;
    cursor: pointer; white-space: nowrap;
    transition: all .2s;
    user-select: none;
}
.qq-btn--primary { background: var(--qq-primary); color: #fff !important; }
.qq-btn--primary:hover { background: var(--qq-primary-hover); box-shadow: 0 6px 16px rgba(37, 99, 235, .35); }
.qq-btn--gradient { background: var(--qq-gradient); color: #fff !important; }
.qq-btn--gradient:hover { filter: brightness(1.06); box-shadow: 0 6px 16px rgba(37, 99, 235, .35); }
.qq-btn--outline { border-color: var(--qq-primary); color: var(--qq-primary) !important; background: #fff; }
.qq-btn--outline:hover { background: var(--qq-primary-light); }
.qq-btn--ghost { border-color: var(--qq-border); color: var(--qq-text) !important; background: #fff; }
.qq-btn--ghost:hover { border-color: var(--qq-primary); color: var(--qq-primary) !important; }
.qq-btn--white { background: #fff; color: var(--qq-primary) !important; }
.qq-btn--white:hover { box-shadow: 0 6px 16px rgba(15, 23, 42, .18); }
.qq-btn--lg { height: 50px; padding: 0 38px; font-size: 16px; }
.qq-btn--sm { height: 34px; padding: 0 16px; font-size: 13px; }
.qq-btn--block { width: 100%; }
.qq-btn[disabled], .qq-btn.qq-disabled { opacity: .5; cursor: not-allowed; pointer-events: none; }

/* ---------- 徽标 ---------- */
.qq-badge {
    display: inline-flex; align-items: center;
    padding: 3px 12px; border-radius: 999px;
    font-size: 13px; font-weight: 500;
    background: var(--qq-primary-light); color: var(--qq-primary);
}
.qq-badge--success { background: #f0fdf4; color: var(--qq-success); }
.qq-badge--warning { background: #fffbeb; color: var(--qq-warning); }
.qq-badge--danger { background: #fef2f2; color: var(--qq-danger); }
.qq-badge--gray { background: #f1f5f9; color: var(--qq-muted); }

/* ---------- 提示条 ---------- */
.qq-alert {
    padding: 12px 18px; border-radius: var(--qq-radius-sm);
    font-size: 14px; border: 1px solid transparent;
}
.qq-alert--info { background: var(--qq-primary-light); border-color: #bfdbfe; color: #1e40af; }
.qq-alert--success { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.qq-alert--warning { background: #fffbeb; border-color: #fde68a; color: #92400e; }
.qq-alert--danger { background: #fef2f2; border-color: #fecaca; color: #991b1b; }

/* ---------- 表格 ---------- */
.qq-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--qq-border);
    border-radius: var(--qq-radius);
    background: #fff;
}
.qq-table th, .qq-table td {
    padding: 14px 18px; text-align: left;
    border-bottom: 1px solid var(--qq-border);
    font-size: 14px; white-space: nowrap;
}
.qq-table th { background: var(--qq-bg-alt); color: var(--qq-heading); font-weight: 600; }
.qq-table tr:last-child td { border-bottom: 0; }
.qq-table tbody tr:hover { background: #fafcff; }

/* ---------- 表单 ---------- */
.qq-form-item { margin-bottom: 20px; }
.qq-label { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 500; color: var(--qq-heading); }
.qq-label i, .qq-required { color: var(--qq-danger); font-style: normal; margin-right: 2px; }

.qq-input, .qq-select, .qq-textarea {
    width: 100%; height: 44px;
    padding: 0 14px;
    border: 1px solid var(--qq-border);
    border-radius: var(--qq-radius-sm);
    background: #fff; font-size: 14px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
}
.qq-textarea { height: auto; min-height: 110px; padding: 10px 14px; resize: vertical; }
.qq-input:focus, .qq-select:focus, .qq-textarea:focus {
    border-color: var(--qq-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}
.qq-input::placeholder, .qq-textarea::placeholder { color: #94a3b8; }
.qq-input[disabled], .qq-select[disabled] { background: #f8fafc; color: var(--qq-muted); cursor: not-allowed; }

.qq-input-group { display: flex; gap: 10px; }
.qq-input-group .qq-input { flex: 1; min-width: 0; }
.qq-input-group .qq-btn { flex: none; height: 44px; }

.qq-form-error { margin-top: 6px; font-size: 13px; color: var(--qq-danger); }
.qq-form-tip { margin-top: 6px; font-size: 13px; color: var(--qq-muted); }

/* ---------- 选项卡 ---------- */
.qq-tabs {
    display: flex; gap: 8px; flex-wrap: wrap;
    border-bottom: 1px solid var(--qq-border);
    margin-bottom: 28px;
}
.qq-tab {
    padding: 10px 22px; cursor: pointer;
    font-size: 15px; color: var(--qq-muted);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px; transition: all .2s;
    background: none; border-top: 0; border-left: 0; border-right: 0;
}
.qq-tab:hover { color: var(--qq-primary); }
.qq-tab.active { color: var(--qq-primary); border-bottom-color: var(--qq-primary); font-weight: 600; }

/* 胶囊型选项卡（用于套餐切换等） */
.qq-pills { display: inline-flex; gap: 6px; padding: 5px; background: #eef2f9; border-radius: 999px; flex-wrap: wrap; }
.qq-pill {
    padding: 8px 22px; border-radius: 999px; cursor: pointer;
    font-size: 14px; color: var(--qq-muted); border: 0; background: transparent;
    transition: all .2s; white-space: nowrap;
}
.qq-pill.active { background: #fff; color: var(--qq-primary); font-weight: 600; box-shadow: 0 1px 4px rgba(15, 23, 42, .12); }

/* ---------- Hero 首屏 ---------- */
.qq-hero {
    background: var(--qq-gradient-soft);
    padding: 88px 0 76px;
    position: relative;
    overflow: hidden;
}
.qq-hero::after {
    content: "";
    position: absolute; right: -160px; top: -160px;
    width: 520px; height: 520px; border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, .10) 0%, rgba(6, 182, 212, .05) 55%, transparent 70%);
    pointer-events: none;
}
.qq-hero-inner { position: relative; z-index: 1; max-width: 900px; }
.qq-hero-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 16px; border-radius: 999px;
    background: rgba(37, 99, 235, .10); color: var(--qq-primary);
    font-size: 14px; font-weight: 500; margin-bottom: 22px;
}
.qq-hero-title { font-size: 44px; font-weight: 700; letter-spacing: 1px; }
.qq-hero-title em { font-style: normal; background: var(--qq-gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.qq-hero-sub { margin-top: 18px; font-size: 17px; color: var(--qq-muted); max-width: 720px; }
.qq-hero-actions { margin-top: 34px; display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- CTA 通栏 ---------- */
.qq-cta {
    background: var(--qq-gradient);
    border-radius: 18px;
    padding: 52px 60px;
    display: flex; align-items: center; justify-content: space-between; gap: 28px;
    color: #fff;
    flex-wrap: wrap;
}
.qq-cta h3 { color: #fff; font-size: 28px; }
.qq-cta p { margin-top: 8px; color: rgba(255, 255, 255, .85); }

/* ---------- 步骤 ---------- */
.qq-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: qqstep; }
.qq-step { position: relative; padding: 28px 24px 24px; background: #fff; border: 1px solid var(--qq-border); border-radius: var(--qq-radius); counter-increment: qqstep; }
.qq-step::before {
    content: counter(qqstep, decimal-leading-zero);
    display: block; font-size: 30px; font-weight: 700; margin-bottom: 10px;
    background: var(--qq-gradient);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.qq-step h4 { font-size: 16px; margin-bottom: 6px; }
.qq-step p { font-size: 14px; color: var(--qq-muted); }

/* ---------- FAQ 折叠 ---------- */
.qq-faq { border: 1px solid var(--qq-border); border-radius: var(--qq-radius); background: #fff; overflow: hidden; }
.qq-faq details { border-bottom: 1px solid var(--qq-border); }
.qq-faq details:last-child { border-bottom: 0; }
.qq-faq summary {
    padding: 18px 24px; cursor: pointer; list-style: none;
    font-weight: 500; color: var(--qq-heading);
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    transition: background .2s;
}
.qq-faq summary::-webkit-details-marker { display: none; }
.qq-faq summary::after { content: "+"; font-size: 20px; color: var(--qq-muted); flex: none; transition: transform .2s; }
.qq-faq details[open] summary::after { transform: rotate(45deg); color: var(--qq-primary); }
.qq-faq summary:hover { background: #fafcff; }
.qq-faq .qq-faq-body { padding: 0 24px 18px; color: var(--qq-muted); font-size: 14px; }

/* ---------- 价格卡 ---------- */
.qq-price-card { position: relative; display: flex; flex-direction: column; }
.qq-price-card .qq-price-name { font-size: 17px; font-weight: 600; color: var(--qq-heading); }
.qq-price-card .qq-price-desc { font-size: 13px; color: var(--qq-muted); margin-top: 4px; }
.qq-price-num { margin: 18px 0 4px; font-size: 36px; font-weight: 700; color: var(--qq-heading); }
.qq-price-num small { font-size: 14px; font-weight: 400; color: var(--qq-muted); }
.qq-price-features { margin: 16px 0 22px; flex: 1; }
.qq-price-features li {
    padding: 6px 0 6px 26px; font-size: 14px; color: var(--qq-text);
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="%232563eb"><path fill-rule="evenodd" d="M16.7 5.3a1 1 0 0 1 0 1.4l-7 7a1 1 0 0 1-1.4 0l-3-3a1 1 0 1 1 1.4-1.4l2.3 2.29 6.3-6.3a1 1 0 0 1 1.4 0z"/></svg>') no-repeat left 9px / 16px;
}
.qq-price-card--hot { border: 2px solid var(--qq-primary); }
.qq-price-hot-tag {
    position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
    background: var(--qq-gradient); color: #fff;
    padding: 2px 18px; border-radius: 999px; font-size: 13px; white-space: nowrap;
}

/* ---------- 面包屑 / 页头横幅 ---------- */
.qq-page-hero {
    background: var(--qq-gradient-soft);
    padding: 60px 0 48px;
}
.qq-page-hero h1 { font-size: 34px; }
.qq-page-hero p { margin-top: 10px; color: var(--qq-muted); max-width: 760px; }

/* ---------- 空状态 ---------- */
.qq-empty { text-align: center; padding: 40px 20px; }
.qq-empty-icon {
    width: 56px; height: 56px; margin: 0 auto 14px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%; background: var(--qq-bg-alt); color: var(--qq-muted);
}
.qq-empty-icon svg { width: 26px; height: 26px; fill: currentColor; }
.qq-empty-title { font-size: 15px; color: var(--qq-heading); font-weight: 500; }
.qq-empty-desc { margin-top: 6px; font-size: 13px; color: var(--qq-muted); }
.qq-empty .qq-btn { margin-top: 16px; }

/* ---------- 加载骨架 ---------- */
.qq-skeleton {
    display: inline-block; border-radius: 6px;
    background: linear-gradient(90deg, #eef2f7 25%, #f6f9fe 50%, #eef2f7 75%);
    background-size: 200% 100%;
    animation: qq-skeleton-shimmer 1.3s ease-in-out infinite;
    color: transparent !important;
}
@keyframes qq-skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.qq-spinner {
    display: inline-block; width: 16px; height: 16px; vertical-align: -3px;
    border: 2px solid rgba(37, 99, 235, .25); border-top-color: var(--qq-primary);
    border-radius: 50%; animation: qq-spin .8s linear infinite;
}
@keyframes qq-spin { to { transform: rotate(360deg); } }

/* ---------- 弹层（qq-dialog，轻量替代旧 qg_popup） ---------- */
.qq-dialog-mask {
    position: fixed; inset: 0; z-index: 3000;
    background: rgba(15, 23, 42, .45);
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
}
.qq-dialog {
    background: #fff; border-radius: var(--qq-radius);
    width: 420px; max-width: 100%;
    box-shadow: 0 24px 64px rgba(15, 23, 42, .25);
    overflow: hidden;
}
.qq-dialog-head { padding: 18px 24px 0; font-size: 17px; font-weight: 600; color: var(--qq-heading); }
.qq-dialog-body { padding: 18px 24px; }
.qq-dialog-foot { padding: 0 24px 20px; display: flex; gap: 12px; justify-content: flex-end; }

/* ============================================================
   顶部导航
   ============================================================ */
.qq-nav {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--qq-border);
}
.qq-nav-inner {
    height: var(--qq-nav-height);
    display: flex; align-items: center; gap: 40px;
}
.qq-logo { display: flex; align-items: center; gap: 10px; flex: none; }
.qq-logo-img {
    width: 34px; height: 34px; border-radius: 9px; display: block;
    box-shadow: 0 4px 10px rgba(11, 31, 58, .18);
}
.qq-logo-mark {
    width: 34px; height: 34px; border-radius: 9px;
    background: var(--qq-gradient);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 17px;
}
.qq-logo-name { font-size: 19px; font-weight: 700; color: var(--qq-heading); letter-spacing: 1px; }
.qq-logo-name small { display: block; font-size: 11px; font-weight: 400; color: var(--qq-muted); letter-spacing: 2px; line-height: 1.1; }

.qq-nav-menu { display: flex; align-items: center; gap: 6px; flex: 1; }
.qq-nav-link {
    padding: 8px 16px; border-radius: var(--qq-radius-sm);
    color: var(--qq-text); font-size: 15px; font-weight: 500;
    transition: all .2s;
}
.qq-nav-link:hover { color: var(--qq-primary); background: var(--qq-primary-light); }
.qq-nav-link.active { color: var(--qq-primary); }

.qq-nav-actions { display: flex; align-items: center; gap: 12px; flex: none; }

/* 登录态用户菜单 */
.qq-nav-user { position: relative; display: none; }
.qq-nav-user.show { display: block; }
.qq-nav-user-btn {
    display: flex; align-items: center; gap: 8px; cursor: pointer;
    padding: 6px 12px; border-radius: var(--qq-radius-sm);
    transition: background .2s;
}
.qq-nav-user-btn:hover { background: var(--qq-primary-light); }
.qq-nav-avatar {
    width: 32px; height: 32px; border-radius: 50%;
    background: var(--qq-gradient); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 15px; font-weight: 600;
}
.qq-nav-username { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.qq-nav-dropdown {
    position: absolute; right: 0; top: calc(100% + 8px);
    width: 200px; background: #fff;
    border: 1px solid var(--qq-border); border-radius: var(--qq-radius);
    box-shadow: 0 12px 32px rgba(15, 23, 42, .12);
    padding: 8px; display: none;
}
.qq-nav-user:hover .qq-nav-dropdown { display: block; }
.qq-nav-dropdown a {
    display: block; padding: 9px 14px; border-radius: var(--qq-radius-sm);
    color: var(--qq-text); font-size: 14px;
}
.qq-nav-dropdown a:hover { background: var(--qq-primary-light); color: var(--qq-primary); }
.qq-nav-dropdown .qq-dropdown-divider { height: 1px; background: var(--qq-border); margin: 6px 8px; }

/* 移动端汉堡 */
.qq-nav-burger {
    display: none; flex: none;
    width: 40px; height: 40px; border: 0; background: none; cursor: pointer;
    align-items: center; justify-content: center;
}
.qq-nav-burger span, .qq-nav-burger span::before, .qq-nav-burger span::after {
    display: block; width: 22px; height: 2px; background: var(--qq-heading);
    position: relative; transition: all .25s; content: "";
}
.qq-nav-burger span::before { position: absolute; top: -7px; }
.qq-nav-burger span::after { position: absolute; top: 7px; }
.qq-nav.menu-open .qq-nav-burger span { background: transparent; }
.qq-nav.menu-open .qq-nav-burger span::before { top: 0; transform: rotate(45deg); }
.qq-nav.menu-open .qq-nav-burger span::after { top: 0; transform: rotate(-45deg); }

/* ============================================================
   页脚（浅色）
   ============================================================ */
.qq-footer { background: #f1f5f9; border-top: 1px solid var(--qq-border); margin-top: 0; }
.qq-footer-main {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 32px;
    padding: 56px 0 40px;
}
.qq-footer-brand p { margin-top: 14px; color: var(--qq-muted); font-size: 14px; max-width: 320px; }
.qq-footer-col h4 { font-size: 15px; margin-bottom: 16px; }
.qq-footer-col a { display: block; padding: 5px 0; color: var(--qq-muted); font-size: 14px; }
.qq-footer-col a:hover { color: var(--qq-primary); }
.qq-footer-bottom {
    border-top: 1px solid var(--qq-border);
    padding: 20px 0;
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    flex-wrap: wrap;
    color: var(--qq-muted); font-size: 13px;
}

/* 服务承诺条 */
.qq-footer-promise {
    display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
    padding: 22px 0; border-bottom: 1px solid var(--qq-border);
    color: var(--qq-heading); font-size: 14px; font-weight: 500;
}
.qq-footer-promise span { display: inline-flex; align-items: center; gap: 8px; }
.qq-footer-promise svg { width: 18px; height: 18px; fill: var(--qq-primary); flex: none; }

/* ---------- 通用工具类 ---------- */
.qq-text-center { text-align: center; }
.qq-muted { color: var(--qq-muted); }
.qq-flex { display: flex; }
.qq-flex-center { display: flex; align-items: center; justify-content: center; }
.qq-flex-between { display: flex; align-items: center; justify-content: space-between; }
.qq-gap-12 { gap: 12px; }
.qq-gap-16 { gap: 16px; }
.qq-gap-24 { gap: 24px; }
.qq-mt-8 { margin-top: 8px; }
.qq-mt-16 { margin-top: 16px; }
.qq-mt-24 { margin-top: 24px; }
.qq-mt-32 { margin-top: 32px; }
.qq-mt-48 { margin-top: 48px; }
.qq-mb-16 { margin-bottom: 16px; }
.qq-mb-24 { margin-bottom: 24px; }
.qq-hide { display: none !important; }

/* ---------- 认证页（登录/注册）布局 ---------- */
.qq-auth {
    min-height: calc(100vh - var(--qq-nav-height));
    background: var(--qq-gradient-soft);
    display: flex; align-items: center; justify-content: center;
    padding: 48px 24px;
}
.qq-auth-card {
    width: 440px; max-width: 100%;
    background: #fff; border-radius: 16px;
    border: 1px solid var(--qq-border);
    box-shadow: 0 20px 60px rgba(15, 23, 42, .10);
    padding: 40px 40px 32px;
}
.qq-auth-title { font-size: 24px; text-align: center; }
.qq-auth-sub { text-align: center; color: var(--qq-muted); font-size: 14px; margin: 8px 0 28px; }

/* ============================================================
   响应式断点
   ============================================================ */
@media (max-width: 1600px) {
    /* 容器自动 100%-48px，无需额外处理 */
}

@media (max-width: 1200px) {
    .qq-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
    .qq-steps { grid-template-columns: repeat(2, 1fr); }
    .qq-hero-title { font-size: 36px; }
    .qq-footer-main { grid-template-columns: 1fr 1fr 1fr; }
    .qq-footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 992px) {
    .qq-container { width: calc(100% - 40px); }
    .qq-section { padding: 56px 0; }
    .qq-section-title { font-size: 26px; }
    .qq-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }

    /* 导航折叠 */
    .qq-nav-burger { display: flex; }
    .qq-nav-menu {
        display: none;
        position: absolute; left: 0; right: 0; top: var(--qq-nav-height);
        background: #fff; border-bottom: 1px solid var(--qq-border);
        flex-direction: column; align-items: stretch; gap: 0;
        padding: 8px 16px 16px;
        box-shadow: 0 16px 32px rgba(15, 23, 42, .08);
    }
    .qq-nav.menu-open .qq-nav-menu { display: flex; }
    .qq-nav-link { padding: 12px 12px; }
    .qq-nav-inner { gap: 16px; justify-content: space-between; }
}

@media (max-width: 768px) {
    body { font-size: 14px; }
    .qq-container { width: calc(100% - 32px); }
    .qq-section { padding: 44px 0; }
    .qq-grid.cols-2, .qq-grid.cols-3, .qq-grid.cols-4 { grid-template-columns: 1fr; }
    .qq-steps { grid-template-columns: 1fr; }
    .qq-hero { padding: 56px 0 48px; }
    .qq-hero-title { font-size: 28px; }
    .qq-hero-sub { font-size: 15px; }
    .qq-cta { padding: 36px 28px; }
    .qq-cta h3 { font-size: 22px; }
    .qq-page-hero h1 { font-size: 26px; }
    .qq-footer-main { grid-template-columns: 1fr 1fr; padding: 40px 0 24px; }
    .qq-footer-promise { justify-content: flex-start; }
    .qq-footer-bottom { justify-content: center; text-align: center; }
    .qq-auth-card { padding: 32px 24px; }
    .qq-section-head { margin-bottom: 32px; }
    .qq-stat-num { font-size: 30px; }
}

@media (max-width: 480px) {
    .qq-footer-main { grid-template-columns: 1fr; }
    .qq-hero-actions { flex-direction: column; }
    .qq-hero-actions .qq-btn { flex: 1; width: 100%; }
    .qq-nav-username { display: none; }
    /* 超小屏统计数字缩小，避免长数字撑破 */
    .qq-stat-num { font-size: 26px; }
    .qq-stat-label { font-size: 14px; }
    /* CTA 通栏：按钮堆叠占满、间距收紧 */
    .qq-cta { padding: 28px 20px; gap: 16px; }
    .qq-cta h3 { font-size: 20px; }
    .qq-cta > div:last-child { width: 100%; display: flex; flex-direction: column; gap: 12px; }
    .qq-cta .qq-btn { width: 100%; }
    /* 页脚服务承诺条竖排，图标文字不再缠绕 */
    .qq-footer-promise { flex-direction: column; gap: 12px; }
    /* FAQ 触摸区收紧内边距 */
    .qq-faq summary { padding: 16px 16px; font-size: 14px; }
    .qq-faq .qq-faq-body { padding: 0 16px 16px; }
    /* 页头/区块标题再缩一档 */
    .qq-hero-title { font-size: 25px; }
    .qq-section-title { font-size: 23px; }
}