/* ==========================================================================
   快连官网 · 视觉风格对齐参考站（doqlrgg.bond）
   设计语言：暖白底色 + 靛蓝→紫→粉渐变、细边框白卡、居中区块标题、
             悬浮渐变描边、深色页脚 / CTA、顶部深色状态条
   ========================================================================== */

:root {
    --bg: #fafaf7;
    --bg-soft: #f4f3ee;
    --card: #ffffff;
    --border: #ebe9e2;
    --text-main: #1a1a1f;
    --text-secondary: #4a4a55;
    --text-muted: #8b8b96;
    --accent-1: #6366f1;
    --accent-2: #8b5cf6;
    --accent-3: #ec4899;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-soft: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(236, 72, 153, 0.08));
    --dark: #111118;
    --radius: 14px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --shadow-sm: 0 4px 16px rgba(26, 26, 31, 0.05);
    --shadow-md: 0 16px 40px rgba(99, 102, 241, 0.1);
    --shadow-lg: 0 30px 80px rgba(26, 26, 31, 0.12);
    --ease: cubic-bezier(.4, 0, .2, 1);
}

* {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
}

html {
    scroll-behavior: smooth;
    overflow-x: clip;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    font-size: 15px;
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

img {
    max-width: 100%;
    display: block;
}

/* 微妙的全局光晕背景：单层固定渐变（无 blur 滤镜、无重绘开销、不产生横向溢出） */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(520px circle at 92% 0%, rgba(236, 72, 153, .10), transparent 62%),
        radial-gradient(620px circle at 6% 100%, rgba(99, 102, 241, .10), transparent 62%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 48px;
    position: relative;
    z-index: 1;
}

/* ==========================================================================
   顶部状态条
   ========================================================================== */
.topbar {
    background: var(--dark);
    color: #a0a0a8;
    font-size: 12.5px;
    letter-spacing: 0.3px;
    position: relative;
    z-index: 60;
}

.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 9px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.topbar a {
    color: #a0a0a8;
    text-decoration: none;
    margin-left: 18px;
    transition: color .2s ease;
}

.topbar a:hover {
    color: #fff;
}

.topbar .status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.topbar .status::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #22c55e;
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2);
    animation: pulse 2s infinite;
    will-change: opacity;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .5; }
}

/* ==========================================================================
   头部
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(250, 250, 247, .92);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-top: 16px;
    padding-bottom: 16px;
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    color: var(--text-main);
    letter-spacing: -0.3px;
    white-space: nowrap;
}

.brand-logo > span:last-child {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.logo-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--gradient);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 14px;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.logo-mark::after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, .4) 50%, transparent 70%);
    animation: shine 4s infinite;
    will-change: transform;
    pointer-events: none;
}

@keyframes shine {
    0%, 60% { transform: translateX(-100%) rotate(45deg); }
    100% { transform: translateX(100%) rotate(45deg); }
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-nav a {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: all .2s ease;
}

.header-nav a:hover,
.header-nav a.active {
    color: var(--text-main);
    background: rgba(99, 102, 241, .06);
}

.header-cta {
    display: flex;
    align-items: center;
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn-primary-solid,
.btn-header-solid,
.btn-plat-dl,
.btn-secondary-outline,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 24px;
    border-radius: 10px;
    font-size: 14.5px;
    font-weight: 600;
    letter-spacing: .2px;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all .25s var(--ease);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.btn-primary-solid,
.btn-header-solid {
    background-color: var(--text-main);
    background-image: var(--gradient);
    background-repeat: no-repeat;
    background-size: 100% 0%;
    background-position: left center;
    color: #fff;
    box-shadow: 0 4px 20px rgba(26, 26, 31, .18);
    transition: background-size .35s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease), color .2s ease;
}

.btn-primary-solid:hover,
.btn-header-solid:hover {
    background-size: 100% 100%;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(99, 102, 241, .35);
    color: #fff;
}

.btn-header-solid {
    padding: 10px 20px;
    font-size: 14px;
    border-radius: 9px;
}

.btn-secondary-outline {
    background: var(--card);
    color: var(--text-main);
    border-color: var(--border);
}

.btn-secondary-outline:hover {
    border-color: var(--text-main);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, .06);
}

.btn-plat-dl {
    background: var(--bg-soft);
    color: var(--text-main);
    border-color: var(--border);
    width: 100%;
    padding: 12px 20px;
}

.btn-plat-dl:hover {
    background: var(--text-main);
    color: #fff;
    border-color: var(--text-main);
    transform: translateY(-2px);
}

.btn .arrow {
    transition: transform .25s ease;
}

.btn:hover .arrow {
    transform: translateX(3px);
}

.btn-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero-section {
    position: relative;
    z-index: 1;
    padding: 92px 0 80px;
    text-align: center;
    animation: fadeUp .8s ease both;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-inner {
    max-width: 880px;
    margin: 0 auto;
}

.hero-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: .5px;
    color: var(--accent-1);
    background: var(--gradient-soft);
    padding: 7px 16px;
    border-radius: 999px;
    margin-bottom: 28px;
    border: 1px solid rgba(99, 102, 241, .15);
}

.pill-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent-1);
    display: inline-block;
}

.hero-h1 {
    font-size: 60px;
    line-height: 1.1;
    font-weight: 700;
    margin: 0 0 24px;
    letter-spacing: -2px;
    color: var(--text-main);
}

.gradient-tail {
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    display: inline-block;
}

.hero-selling-points {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.75;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-mini-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 46px;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.mini-stat-item strong {
    display: block;
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -1px;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.mini-stat-item span {
    font-size: 13px;
    color: var(--text-muted);
}

/* hero 视觉图 */
.hero-visual {
    width: min(1120px, calc(100vw - 48px));
    max-width: none;
    margin: 64px 0 0 50%;
    translate: -50% 0;
    position: relative;
    animation: fadeUp 1s .2s ease both;
}

@media (max-width: 880px) {
    .hero-visual {
        width: calc(100vw - 44px);
    }
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: -18px;
    z-index: -1;
    border-radius: 40px;
    background:
        radial-gradient(closest-side, rgba(99, 102, 241, .22), rgba(236, 72, 153, .14) 55%, transparent 78%);
    opacity: .85;
    pointer-events: none;
}

.frosted-mockup-frame {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    text-align: left;
}

.mockup-header-bar {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 18px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.bauhaus-shapes {
    display: inline-flex;
    gap: 7px;
}

.shape-circle,
.shape-square,
.shape-pill {
    width: 11px;
    height: 11px;
    display: inline-block;
}

.shape-circle {
    border-radius: 50%;
    background: var(--accent-1);
}

.shape-square {
    background: var(--accent-2);
}

.shape-pill {
    width: 18px;
    border-radius: 999px;
    background: var(--accent-3);
}

.mockup-status-badge {
    font-size: 12.5px;
    font-weight: 600;
    color: #16a34a;
    background: rgba(34, 197, 94, .1);
    border: 1px solid rgba(34, 197, 94, .22);
    padding: 4px 12px;
    border-radius: 999px;
}

.mockup-img-box img {
    width: 100%;
    height: auto;
}

.frosted-float-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, .96);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    box-shadow: var(--shadow-md);
    text-align: left;
}

.pos-top-right {
    top: -26px;
    right: -18px;
}

.pos-bottom-left {
    bottom: -26px;
    left: -18px;
}

.float-geo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-soft);
    font-size: 16px;
    flex-shrink: 0;
}

.float-geo-icon.blue {
    background: rgba(6, 182, 212, .12);
}

.float-text strong {
    display: block;
    font-size: 14px;
    color: var(--text-main);
    line-height: 1.4;
}

.float-text span {
    font-size: 12.5px;
    color: var(--text-muted);
}

/* 子页首屏 */
.subpage-hero {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 84px 0 64px;
    animation: fadeUp .8s ease both;
}

.subpage-hero h1 {
    font-size: 46px;
    line-height: 1.15;
    font-weight: 700;
    margin: 0 0 20px;
    letter-spacing: -1.4px;
}

.subpage-hero p {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto;
}

/* ==========================================================================
   通用 section
   ========================================================================== */
.section {
    padding: 88px 0;
    position: relative;
    z-index: 1;
    content-visibility: auto;
    contain-intrinsic-size: auto 640px;
}

.section-alt {
    padding: 88px 0;
    background: var(--bg-soft);
    position: relative;
    z-index: 1;
    content-visibility: auto;
    contain-intrinsic-size: auto 640px;
}

/* 吸顶头部下的锚点定位补偿 */
section,
[id] {
    scroll-margin-top: 96px;
}

.sec-head {
    text-align: center;
    margin: 0 auto 56px;
    max-width: 760px;
}

.sec-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 14px;
    position: relative;
    padding-left: 18px;
}

.sec-tag::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 2px;
    border-radius: 2px;
    background: var(--gradient);
}

.sec-head h2 {
    font-size: 42px;
    font-weight: 700;
    margin: 0 0 16px;
    color: var(--text-main);
    letter-spacing: -1px;
    line-height: 1.15;
}

.sec-lead {
    color: var(--text-secondary);
    font-size: 16px;
    margin: 0;
}

/* ==========================================================================
   卡片通用
   ========================================================================== */
.features-grid-6,
.steps-grid-3,
.platforms-grid-4,
.reviews-grid-3,
.pricing-grid-4,
.stats-band-4 {
    display: grid;
    gap: 24px;
}

.features-grid-6 {
    grid-template-columns: repeat(3, 1fr);
}

.steps-grid-3,
.reviews-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.platforms-grid-4,
.pricing-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.stats-band-4 {
    grid-template-columns: repeat(4, 1fr);
}

.white-card,
.step-card,
.platform-card,
.review-card,
.pricing-card,
.sec-point-card,
.stat-tile {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: transform .35s var(--ease), box-shadow .35s ease, border-color .35s ease;
    position: relative;
}

.white-card::before,
.step-card::before,
.platform-card::before,
.review-card::before,
.pricing-card::before,
.sec-point-card::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    padding: 1px;
    background: var(--gradient);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity .35s ease;
    pointer-events: none;
}

.white-card:hover,
.step-card:hover,
.platform-card:hover,
.review-card:hover,
.pricing-card:hover,
.sec-point-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.white-card:hover::before,
.step-card:hover::before,
.platform-card:hover::before,
.review-card:hover::before,
.pricing-card:hover::before,
.sec-point-card:hover::before {
    opacity: 1;
}

/* 特性卡 */
.white-card {
    padding: 36px 32px;
}

.card-circle-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 22px;
}

.white-card h3,
.step-card h3,
.platform-card h3,
.review-card h3,
.pricing-card h3 {
    margin: 0 0 10px;
    font-size: 19px;
    color: var(--text-main);
    font-weight: 700;
}

.white-card p,
.step-card p,
.platform-card p,
.review-card p,
.pricing-card p {
    color: var(--text-secondary);
    line-height: 1.75;
    margin: 0;
    font-size: 14.5px;
}

/* 步骤卡 */
.step-card {
    padding: 34px 30px;
}

.step-num-badge {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--gradient);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 15px;
    margin-bottom: 20px;
    box-shadow: 0 6px 18px rgba(99, 102, 241, .25);
}

/* 平台卡 */
.platform-card {
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
}

.plat-icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--gradient-soft);
    color: var(--accent-1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.platform-card .plat-req {
    font-size: 13.5px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.plat-ver {
    display: inline-block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--accent-1);
    background: rgba(99, 102, 241, .08);
    border: 1px solid rgba(99, 102, 241, .16);
    padding: 3px 10px;
    border-radius: 999px;
    margin-bottom: 20px;
    align-self: flex-start;
}

.platform-card .btn-plat-dl {
    margin-top: auto;
}

/* 评价卡 */
.review-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 22px;
}

.stars-five {
    color: #f59e0b;
    letter-spacing: 3px;
    font-size: 14px;
    margin-bottom: 14px;
}

.review-quote {
    font-size: 15.5px !important;
    color: var(--text-main) !important;
    line-height: 1.8 !important;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.user-info {
    font-size: 13px;
    line-height: 1.4;
}

.user-info strong {
    display: block;
    color: var(--text-main);
    font-weight: 600;
    font-size: 14px;
}

.user-info span {
    color: var(--text-muted);
    font-size: 12.5px;
}

/* 数据条 */
.stat-tile {
    padding: 34px 24px;
    text-align: center;
}

.stat-big-num {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -1.5px;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    line-height: 1.2;
}

.stat-label {
    font-size: 13.5px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* 套餐卡 */
.pricing-card {
    padding: 34px 28px;
    display: flex;
    flex-direction: column;
}

.pricing-card.featured {
    border-color: transparent;
    background:
        linear-gradient(var(--card), var(--card)) padding-box,
        var(--gradient) border-box;
    border: 1px solid transparent;
    box-shadow: var(--shadow-md);
}

.pricing-badge {
    align-self: flex-start;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    background: var(--gradient);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 16px;
}

.price-desc {
    color: var(--text-muted);
    font-size: 13.5px !important;
    margin-bottom: 14px !important;
}

.price-num {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -1.5px;
    color: var(--text-main);
    line-height: 1.2;
    margin-bottom: 20px;
}

.price-num span {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 4px;
}

.price-features {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.85;
    flex: 1;
}

.price-features li {
    position: relative;
    padding-left: 22px;
}

.price-features li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gradient);
}

.pricing-card .btn-plat-dl,
.pricing-card .btn-primary-solid {
    margin-top: auto;
}

/* 要点卡（图文左右分栏） */
.security-split-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.security-visual-stack {
    display: grid;
    gap: 20px;
}

.security-main-img img {
    width: 100%;
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}

.security-points-list {
    display: grid;
    gap: 16px;
}

.sec-point-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px 26px;
}

.sec-point-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: var(--gradient-soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 19px;
    flex-shrink: 0;
}

.sec-point-body h4 {
    margin: 0 0 6px;
    font-size: 16px;
    color: var(--text-main);
    font-weight: 700;
}

.sec-point-body p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.75;
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-container-800 {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color .25s ease, box-shadow .25s ease;
}

.faq-item[open] {
    border-color: rgba(99, 102, 241, .3);
    box-shadow: 0 4px 16px rgba(99, 102, 241, .06);
}

.faq-item:hover {
    border-color: rgba(99, 102, 241, .25);
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 15.5px;
    color: var(--text-main);
    list-style: none;
    padding: 22px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    color: var(--text-muted);
    font-size: 22px;
    font-weight: 300;
    transition: transform .3s var(--ease), color .3s ease;
    line-height: 1;
    flex-shrink: 0;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
    color: var(--accent-1);
}

.faq-ans {
    padding: 0 28px 24px;
    color: var(--text-secondary);
    font-size: 14.5px;
    line-height: 1.85;
}

/* ==========================================================================
   CTA
   ========================================================================== */
.cta-band {
    padding: 80px 0 20px;
    position: relative;
    z-index: 1;
}

.cta-inner {
    background: linear-gradient(135deg, #1a1a2e 0%, #2d1b4e 50%, #4a1942 100%);
    border-radius: var(--radius-lg);
    padding: 68px 48px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
    max-width: 1104px;
    margin: 0 auto;
}

.cta-inner::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(236, 72, 153, .4), transparent 60%);
    pointer-events: none;
}

.cta-inner::after {
    content: "";
    position: absolute;
    bottom: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, .4), transparent 60%);
    pointer-events: none;
}

.cta-inner > * {
    position: relative;
}

.cta-inner h2 {
    color: #fff;
    margin: 0 0 14px;
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -1px;
}

.cta-inner p {
    color: rgba(255, 255, 255, .75);
    margin: 0 0 32px;
    font-size: 16px;
}

.cta-inner .btn-primary-solid {
    background-color: #fff;
    color: #1a1a2e;
    box-shadow: none;
}

.cta-inner .btn-primary-solid:hover {
    background-size: 100% 100%;
    color: #fff;
    transition: background-size .35s var(--ease), color .2s .18s;
}

.cta-inner .btn-secondary-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, .25);
}

.cta-inner .btn-secondary-outline:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, .06);
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
    background: var(--dark);
    color: #a0a0a8;
    padding: 70px 0 28px;
    position: relative;
    z-index: 1;
    margin-top: 60px;
}

.site-footer .brand-logo {
    color: #fff;
}

.site-footer .brand-logo > span:last-child {
    color: #6b6b75;
}

.footer-top-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    align-items: start;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.footer-brand p {
    margin: 16px 0 0;
    font-size: 13.5px;
    line-height: 1.75;
    color: #888892;
    max-width: 340px;
}

.footer-col h4 {
    color: #fff;
    font-size: 13px;
    margin: 4px 0 18px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-col a {
    display: block;
    color: #888892;
    text-decoration: none;
    font-size: 13.5px;
    margin-bottom: 10px;
    transition: color .2s ease;
}

.footer-col a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12.5px;
    color: #6b6b75;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom a {
    color: #888892;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: #fff;
}

/* ==========================================================================
   侧边悬浮导航
   ========================================================================== */
.bauhaus-side-dock {
    position: fixed;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 90;
    background: rgba(255, 255, 255, .95);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 8px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bauhaus-side-dock a {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 7px 10px;
    border-radius: 8px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background .2s, color .2s;
    white-space: nowrap;
}

.bauhaus-side-dock a .geo-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border);
    display: inline-block;
    flex-shrink: 0;
    transition: background .2s;
}

.bauhaus-side-dock a:hover,
.bauhaus-side-dock a.active {
    background: var(--gradient-soft);
    color: var(--text-main);
}

.bauhaus-side-dock a:hover .geo-dot,
.bauhaus-side-dock a.active .geo-dot {
    background: var(--accent-1);
}

/* ==========================================================================
   移动端菜单
   ========================================================================== */
.nav-toggle-checkbox {
    display: none;
}

.hamburger-btn {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--card);
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.hamburger-lines {
    width: 18px;
    height: 2px;
    background: var(--text-main);
    position: relative;
}

.hamburger-lines::before,
.hamburger-lines::after {
    content: "";
    position: absolute;
    left: 0;
    width: 18px;
    height: 2px;
    background: var(--text-main);
}

.hamburger-lines::before { top: -6px; }
.hamburger-lines::after { top: 6px; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1180px) {
    .bauhaus-side-dock {
        display: none;
    }
}

@media (max-width: 1024px) {
    .features-grid-6,
    .platforms-grid-4,
    .pricing-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-band-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .security-split-2 {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .hero-h1 {
        font-size: 46px;
    }

    .footer-top-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px 24px;
    }
}

@media (max-width: 880px) {
    .topbar-inner {
        padding: 9px 22px;
        font-size: 12px;
    }

    .container {
        padding: 0 22px;
    }

    .hero-section {
        padding: 62px 0 56px;
    }

    .hero-h1 {
        font-size: 34px;
        letter-spacing: -1px;
    }

    .hero-selling-points {
        font-size: 16px;
    }

    .hero-mini-stats {
        gap: 28px;
    }

    .subpage-hero {
        padding: 60px 0 48px;
    }

    .subpage-hero h1 {
        font-size: 30px;
    }

    .section,
    .section-alt {
        padding: 62px 0;
    }

    .sec-head h2 {
        font-size: 30px;
    }

    .cta-band {
        padding: 60px 0 10px;
    }

    .cta-inner {
        padding: 48px 22px;
    }

    .cta-inner h2 {
        font-size: 26px;
    }

    .site-footer {
        padding: 50px 0 24px;
    }
}

@media (max-width: 768px) {
    .hamburger-btn {
        display: inline-flex;
    }

    .header-inner {
        position: relative;
    }

    .header-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        flex-direction: column;
        padding: 14px;
        gap: 4px;
        box-shadow: var(--shadow-md);
    }

    .nav-toggle-checkbox:checked ~ .header-nav {
        display: flex;
    }

    .features-grid-6,
    .steps-grid-3,
    .reviews-grid-3,
    .platforms-grid-4,
    .pricing-grid-4,
    .stats-band-4 {
        grid-template-columns: 1fr;
    }

    .pos-top-right,
    .pos-bottom-left {
        display: none;
    }
}

/* ==========================================================================
   SEO / GEO 新增组件：答案块、规格表、子页入口卡、套餐摘要带
   ========================================================================== */

/* 直接答案块：AI 搜索与 Bing 精选摘要优先抓取 */
.answer-box {
    max-width: 880px;
    margin: 28px auto 0;
    background: var(--card);
    border: 1px solid rgba(99, 102, 241, .18);
    border-left: 4px solid var(--accent-1);
    border-radius: var(--radius);
    padding: 20px 24px;
    text-align: left;
    font-size: 15px;
    line-height: 1.85;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.answer-box strong {
    color: var(--text-main);
    font-weight: 700;
}

.answer-box a {
    color: var(--accent-1);
    text-decoration: none;
    font-weight: 600;
}

.answer-box a:hover {
    text-decoration: underline;
}

/* 平台卡下方的子页链接 */
.plat-sub-link {
    display: block;
    margin-top: 12px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-1);
    text-decoration: none;
}

.plat-sub-link:hover {
    text-decoration: underline;
}

/* 子页入口卡片 */
.subpage-link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.subpage-link-card {
    display: block;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px 24px;
    text-decoration: none;
    transition: transform .3s var(--ease), box-shadow .3s ease, border-color .3s ease;
}

.subpage-link-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.subpage-link-title {
    display: block;
    font-size: 16.5px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.subpage-link-desc {
    display: block;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* 规格对比表 */
.table-wrap {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--card);
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 640px;
}

.spec-table th,
.spec-table td {
    padding: 15px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.spec-table thead th {
    background: var(--bg-soft);
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    font-size: 13.5px;
    letter-spacing: .3px;
}

.spec-table tbody tr:last-child td {
    border-bottom: none;
}

.spec-table tbody tr:hover {
    background: rgba(99, 102, 241, .03);
}

.spec-table td:first-child {
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
}

/* 套餐摘要带（下载页精简版，避免与价格页内耗） */
.pricing-summary-band {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.pricing-summary-item {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px 16px;
    text-align: center;
}

.pricing-summary-item.featured {
    background: var(--gradient-soft);
    border-color: rgba(99, 102, 241, .28);
}

.pricing-summary-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.pricing-summary-price {
    display: block;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--text-main);
}

.pricing-summary-price span {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 3px;
}

.pricing-summary-band .btn-primary-solid {
    grid-column: 1 / -1;
    justify-self: center;
    margin-top: 8px;
}

.pricing-summary-note {
    margin: 20px auto 0;
    max-width: 860px;
    text-align: center;
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.8;
}

.pricing-summary-note a {
    color: var(--accent-1);
    font-weight: 600;
    text-decoration: none;
}

/* 页脚附加信息行 */
.footer-links-row {
    display: inline-flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}

.footer-links-row a {
    color: #888892;
}

.footer-links-row a:hover {
    color: #fff;
}

@media (max-width: 1024px) {
    .pricing-summary-band {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .answer-box {
        padding: 16px 18px;
        font-size: 14.5px;
    }

    .pricing-summary-band {
        grid-template-columns: 1fr;
        padding: 18px;
    }
}

/* ==========================================================================
   动效偏好与渲染优化
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
    }
}

/* 图片解码优化，避免首屏缩放重采样 */
img {
    image-rendering: auto;
}

/* 打印时去掉装饰性渐变，节省墨量 */
@media print {
    body::before,
    .hero-visual::before,
    .cta-inner::before,
    .cta-inner::after {
        display: none;
    }
}

/* ==========================================================================
   可见面包屑（Bing 可见面包屑 + 站内层级信号）
   ========================================================================== */
.crumbs {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 48px 0;
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.crumbs a { color: var(--text-muted); text-decoration: none; transition: color .2s ease; }
.crumbs a:hover { color: var(--accent-1); }
.crumb-sep { opacity: .55; }

@media (max-width: 880px) {
    .crumbs { padding: 14px 22px 0; }
}
/* ==========================================================================
   政策页正文（隐私政策 / 服务条款 / 退款政策）
   ========================================================================== */
.policy-body {
    padding: 56px 0 72px;
}
.policy-body .container {
    max-width: 860px;
}
.policy-body h2 {
    font-size: 22px;
    margin: 34px 0 12px;
    color: var(--text-strong, #1c1c22);
}
.policy-body h2:first-child {
    margin-top: 0;
}
.policy-body p {
    font-size: 15.5px;
    line-height: 1.9;
    color: var(--text-muted, #55565e);
    margin: 10px 0;
}
.policy-body ul,
.policy-body ol {
    margin: 10px 0 10px 22px;
    color: var(--text-muted, #55565e);
}
.policy-body li {
    font-size: 15.5px;
    line-height: 1.9;
    margin: 6px 0;
}
.policy-body strong {
    color: var(--text-strong, #1c1c22);
}
/* FAQ 页审核信息行（E-E-A-T 显式信号） */
.audit-line {
    margin-top: 14px;
    font-size: 13px;
    color: var(--text-muted);
    opacity: .85;
}
/* 顶部品牌标识（图片版，替换原 CSS 绘制的 .logo-mark） */
.logo-img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: block;
    flex-shrink: 0;
}
/* 顶部品牌标识：优先 ICO（logo-k.ico），不支持的浏览器回退 PNG */
.logo-img {
    display: inline-flex;
    flex-shrink: 0;
    line-height: 0;
}
.logo-img img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: block;
}