/* ==========================================================================
   快连官网 - 帮助中心页面完整样式表
   颜色基调：深海军蓝 + 青蓝渐变
   域名：huailiang.com.cn/faq.html
   ========================================================================== */

/* ========== 基础变量 ========== */
:root {
    --primary: #0066CC;
    --primary-dark: #004C99;
    --primary-light: #3399FF;
    --accent: #00B4D8;
    --accent-dark: #0096B4;
    --bg-dark: #0A192F;
    --bg-light: #F0F7FF;
    --text-dark: #0A192F;
    --text-medium: #2C3E50;
    --text-light: #5A7A9A;
    --white: #FFFFFF;
    --card-bg: #F8FBFF;
    --border-light: rgba(0, 102, 204, 0.08);
    --shadow-sm: 0 2px 12px rgba(0, 102, 204, 0.04);
    --shadow-md: 0 8px 28px rgba(0, 102, 204, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 102, 204, 0.12);
    --gradient-hero: linear-gradient(135deg, #0A192F 0%, #0F2A4A 40%, #14456E 70%, #1B6590 100%);
    --gradient-cta: linear-gradient(135deg, #0066CC 0%, #004C99 100%);
    --gradient-accent: linear-gradient(135deg, #00B4D8 0%, #0096B4 100%);
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-xl: 40px;
}

/* ========== 重置与基础 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.65;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ========== 导航栏 ========== */
.navbar {
    background: rgba(10, 25, 47, 0.92);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(0, 180, 216, 0.12);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 10px 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.5rem;
    color: #fff;
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo-area img {
    height: 42px;
    width: auto;
    display: block;
    filter: drop-shadow(0 0 8px rgba(0, 180, 216, 0.5));
}

.logo-area span {
    color: var(--accent);
}

.logo-area .logo-tag {
    font-size: 0.6rem;
    background: var(--accent);
    color: #0A192F;
    padding: 2px 10px;
    border-radius: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-left: 4px;
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.88rem;
    transition: 0.25s;
    position: relative;
    letter-spacing: 0.3px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
    border-radius: 2px;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a.active {
    color: var(--accent);
}

.nav-links a.active::after {
    width: 100%;
}

.btn-nav {
    background: var(--gradient-accent) !important;
    color: #0A192F !important;
    padding: 8px 22px;
    border-radius: 40px;
    font-weight: 700;
    font-size: 0.82rem;
    box-shadow: 0 4px 20px rgba(0, 180, 216, 0.35);
    transition: all 0.3s;
    letter-spacing: 0.5px;
}

.btn-nav::after {
    display: none !important;
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 180, 216, 0.5);
    color: #0A192F !important;
}

/* ========== 通用 Hero ========== */
.hero {
    padding: 80px 0 70px;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 180, 216, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 102, 204, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-grid {
    display: flex;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.hero-left {
    flex: 1.15;
    min-width: 320px;
}

.hero-right {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: flex-end;
}

.hero-badge {
    display: inline-block;
    background: rgba(0, 180, 216, 0.12);
    border: 1px solid rgba(0, 180, 216, 0.25);
    border-radius: 40px;
    padding: 6px 22px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 14px;
    letter-spacing: 1px;
}

.hero-badge .dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    margin-right: 6px;
    animation: pulse-dot 1.5s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.12;
    color: #fff;
    margin-bottom: 14px;
    letter-spacing: -1px;
}

.hero h1 .highlight {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.hero h1 .underline {
    border-bottom: 3px solid var(--accent);
    padding-bottom: 2px;
}

.hero-desc {
    font-size: 1.02rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 540px;
    margin-bottom: 20px;
    line-height: 1.8;
}

.hero-desc strong {
    color: #fff;
    font-weight: 600;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #0A192F;
    border: none;
    padding: 14px 36px;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 24px rgba(0, 180, 216, 0.4);
    transition: all 0.3s;
    cursor: pointer;
    text-decoration: none;
    letter-spacing: 0.5px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0, 180, 216, 0.55);
    background: linear-gradient(135deg, #00c8e0 0%, #00b4d8 100%);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 14px 28px;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: 0.3s;
    text-decoration: none;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(0, 180, 216, 0.06);
}

.hero-platforms {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 18px;
}

.hero-platforms span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.06);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.82rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: 0.3s;
}

.hero-platforms span:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(0, 180, 216, 0.08);
}

.hero-platforms i {
    color: var(--accent);
}

.hero-image-single .img-wrapper {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(0, 180, 216, 0.2);
    border-radius: 24px;
    padding: 10px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
    transition: 0.4s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    max-width: 100%;
    animation: heroFloat 4s ease-in-out infinite;
    backdrop-filter: blur(4px);
}

.hero-image-single .img-wrapper:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: 0 16px 56px rgba(0, 102, 204, 0.3);
}

@keyframes heroFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.hero-image-single .img-wrapper img {
    width: 100%;
    max-width: 680px;
    height: auto;
    border-radius: 16px;
    max-height: 380px;
    object-fit: contain;
    display: block;
}

/* ========== 通用 Section Headers ========== */
.section-header {
    text-align: center;
    margin-bottom: 36px;
}

.section-badge {
    display: inline-block;
    background: rgba(0, 102, 204, 0.06);
    border: 1px solid rgba(0, 102, 204, 0.1);
    border-radius: 40px;
    padding: 4px 20px;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-dark);
    letter-spacing: -0.5px;
}

.section-title i {
    color: var(--primary);
    margin-right: 8px;
}

.section-title .gold {
    color: var(--accent-dark);
}

.section-sub {
    color: var(--text-medium);
    font-size: 1rem;
    margin-top: 4px;
}

/* ========== 搜索与分类导航 ========== */
.help-search-section {
    padding: 60px 0 70px;
    background: var(--white);
}

.help-search-box {
    max-width: 600px;
    margin: 0 auto 36px;
    position: relative;
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border: 2px solid var(--border-light);
    border-radius: 60px;
    padding: 6px 16px;
    transition: 0.3s;
    box-shadow: var(--shadow-sm);
}

.help-search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.08);
}

.search-icon {
    color: var(--text-light);
    font-size: 1rem;
    margin-right: 12px;
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 12px 0;
    font-size: 0.95rem;
    color: var(--text-dark);
    outline: none;
    font-family: inherit;
}

.search-input::placeholder {
    color: var(--text-light);
}

.search-clear-btn {
    background: var(--bg-light);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-light);
    transition: 0.2s;
    flex-shrink: 0;
    display: none;
}

.search-clear-btn:hover {
    background: #E0EAF5;
    color: var(--text-dark);
}

.help-category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.help-category-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 28px 20px 22px;
    text-align: center;
    border: 1px solid var(--border-light);
    transition: 0.3s;
    text-decoration: none;
    display: block;
    box-shadow: var(--shadow-sm);
}

.help-category-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 102, 204, 0.15);
    box-shadow: var(--shadow-md);
}

.category-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: rgba(0, 180, 216, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    font-size: 1.5rem;
    color: var(--accent);
    transition: 0.3s;
}

.help-category-card:hover .category-icon {
    background: var(--gradient-accent);
    color: #0A192F;
}

.help-category-card h3 {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.help-category-card p {
    font-size: 0.8rem;
    color: var(--text-light);
    line-height: 1.5;
    margin-bottom: 12px;
}

.category-count {
    display: inline-block;
    background: rgba(0, 102, 204, 0.05);
    padding: 3px 12px;
    border-radius: 30px;
    font-size: 0.7rem;
    color: var(--primary);
    font-weight: 700;
}

/* ========== 热门问题标签 ========== */
.hot-topics-section {
    padding: 70px 0 80px;
    background: var(--bg-dark);
    position: relative;
}

.hot-topics-section .section-title,
.hot-topics-section h2 {
    color: #fff;
}

.hot-topics-section .section-sub {
    color: rgba(255, 255, 255, 0.55);
}

.hot-topics-section .section-badge {
    background: rgba(0, 180, 216, 0.08);
    border-color: rgba(0, 180, 216, 0.2);
    color: var(--accent);
}

.hot-topics-cloud {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 14px;
    max-width: 750px;
    margin: 0 auto;
    padding: 20px 10px;
}

.hot-topic {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 40px;
    font-weight: 700;
    letter-spacing: 0.5px;
    transition: 0.3s;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.hot-topic:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
}

.hot-topic-xl {
    font-size: 1.4rem;
    background: rgba(0, 180, 216, 0.12);
    color: var(--accent);
    border-color: rgba(0, 180, 216, 0.25);
}

.hot-topic-lg {
    font-size: 1.15rem;
    background: rgba(0, 102, 204, 0.15);
    color: #3399FF;
    border-color: rgba(0, 102, 204, 0.2);
}

.hot-topic-md {
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.75);
}

.hot-topic-sm {
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.03);
    color: rgba(255, 255, 255, 0.5);
}

/* ========== 快速诊断工具 ========== */
.quick-diagnosis-section {
    padding: 70px 0 80px;
    background: var(--bg-light);
}

.diagnosis-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 44px 40px;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
}

.diagnosis-icon {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 12px;
}

.diagnosis-card h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.diagnosis-card h2 i {
    color: var(--primary);
    margin-right: 8px;
}

.diagnosis-card h2 .gold {
    color: var(--accent-dark);
}

.diagnosis-card > p {
    color: var(--text-medium);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.diagnosis-steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.diagnosis-step-item {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    border: 1px solid var(--border-light);
    transition: 0.3s;
}

.diagnosis-step-item:hover {
    border-color: rgba(0, 102, 204, 0.15);
    transform: translateX(4px);
}

.diagnosis-step-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-accent);
    color: #0A192F;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.diagnosis-step-text {
    flex: 1;
    text-align: left;
}

.diagnosis-step-text h4 {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--text-dark);
}

.diagnosis-step-text p {
    font-size: 0.78rem;
    color: var(--text-light);
}

.diagnosis-check {
    color: #22c55e;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.diagnosis-btn {
    display: inline-flex;
    justify-content: center;
}

/* ========== FAQ手风琴 ========== */
.faq-accordion-section {
    padding: 70px 0 80px;
    background: var(--white);
}

.faq-category-group {
    max-width: 850px;
    margin: 0 auto 32px;
}

.faq-category-group:last-child {
    margin-bottom: 0;
}

.faq-category-heading {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-light);
}

.faq-category-heading i {
    color: var(--primary);
}

.faq-accordion-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.faq-accordion-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
    transition: 0.3s;
    overflow: hidden;
}

.faq-accordion-item:hover {
    border-color: rgba(0, 102, 204, 0.12);
}

.faq-accordion-item.open {
    border-color: rgba(0, 102, 204, 0.2);
    box-shadow: var(--shadow-sm);
}

.faq-accordion-q {
    width: 100%;
    background: none;
    border: none;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
    transition: 0.2s;
}

.faq-accordion-q:hover {
    background: rgba(0, 102, 204, 0.03);
}

.faq-q-text {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-dark);
    flex: 1;
}

.faq-chevron {
    color: var(--text-light);
    font-size: 0.8rem;
    transition: 0.3s;
    flex-shrink: 0;
}

.faq-accordion-item.open .faq-chevron {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-accordion-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    padding: 0 20px;
}

.faq-accordion-item.open .faq-accordion-a {
    padding: 0 20px 18px;
}

.faq-accordion-a p {
    font-size: 0.88rem;
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 8px;
}

.faq-accordion-a ol,
.faq-accordion-a ul {
    margin-left: 20px;
    margin-bottom: 10px;
    color: var(--text-medium);
    font-size: 0.85rem;
    line-height: 1.7;
}

.faq-accordion-a li {
    margin-bottom: 4px;
}

.faq-accordion-a strong {
    color: var(--text-dark);
}

/* ========== 故障排查流程 ========== */
.troubleshoot-section {
    padding: 70px 0 80px;
    background: var(--bg-dark);
    position: relative;
}

.troubleshoot-section .section-title,
.troubleshoot-section h2 {
    color: #fff;
}

.troubleshoot-section .section-sub {
    color: rgba(255, 255, 255, 0.55);
}

.troubleshoot-section .section-badge {
    background: rgba(0, 180, 216, 0.08);
    border-color: rgba(0, 180, 216, 0.2);
    color: var(--accent);
}

.troubleshoot-flow {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.troubleshoot-node {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(0, 180, 216, 0.12);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    text-align: center;
    width: 100%;
    transition: 0.3s;
}

.troubleshoot-node:hover {
    border-color: rgba(0, 180, 216, 0.3);
    background: rgba(0, 180, 216, 0.05);
}

.troubleshoot-icon {
    font-size: 1.6rem;
    color: var(--accent);
    margin-bottom: 8px;
}

.troubleshoot-node h3 {
    font-size: 1rem;
    font-weight: 800;
    color: #fff;
}

.troubleshoot-node p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 4px;
}

.troubleshoot-branch {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 10px;
}

.branch-yes {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 30px;
}

.branch-no {
    background: rgba(239, 68, 68, 0.1);
    color: #EF4444;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 30px;
}

.troubleshoot-connector {
    color: rgba(0, 180, 216, 0.4);
    font-size: 1.2rem;
    padding: 8px 0;
}

/* ========== 支持联系 ========== */
.support-contact-section {
    padding: 70px 0 80px;
    background: var(--bg-light);
}

.support-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 44px 40px;
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 36px;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
}

.support-info h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.support-info h2 i {
    color: var(--primary);
    margin-right: 8px;
}

.support-info h2 .gold {
    color: var(--accent-dark);
}

.support-info > p {
    color: var(--text-medium);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.support-methods {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.support-method-item {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    border: 1px solid var(--border-light);
    transition: 0.3s;
}

.support-method-item:hover {
    border-color: rgba(0, 102, 204, 0.12);
    transform: translateX(4px);
}

.support-method-item > i {
    font-size: 1.3rem;
    color: var(--primary);
    width: 32px;
    text-align: center;
    flex-shrink: 0;
}

.support-method-item h4 {
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--text-dark);
}

.support-method-item p {
    font-size: 0.78rem;
    color: var(--text-light);
}

.support-illustration {
    text-align: center;
    padding: 30px 20px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.support-illustration i {
    font-size: 4rem;
    color: var(--accent);
    display: block;
    margin-bottom: 14px;
}

.support-illustration span {
    font-size: 1rem;
    color: var(--text-medium);
    line-height: 1.5;
}

.support-illustration strong {
    font-size: 1.4rem;
    color: var(--primary);
}

/* ========== 最终CTA ========== */
.final-cta {
    padding: 60px 0 80px;
    background: var(--bg-dark);
}

.cta-box {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.6), rgba(0, 76, 153, 0.7));
    border: 1px solid rgba(0, 180, 216, 0.2);
    border-radius: var(--radius-xl);
    padding: 50px 40px;
    text-align: center;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

.cta-box h2 {
    color: #fff;
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.cta-box h2 i {
    color: var(--accent);
    margin-right: 8px;
}

.cta-box p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
    margin-bottom: 24px;
}

.cta-box .btn-primary {
    font-size: 1.05rem;
    padding: 15px 42px;
}

/* ========== Footer ========== */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.65);
    padding: 50px 0 28px;
    border-top: 3px solid var(--primary);
}

.footer a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    transition: 0.2s;
}

.footer a:hover {
    color: var(--accent);
}

.footer .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 34px;
    margin-bottom: 28px;
}

.footer .brand-col .logo {
    font-size: 1.7rem;
    font-weight: 800;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.footer .brand-col .logo i {
    color: var(--accent);
}

.footer .brand-col .logo span {
    color: var(--accent);
}

.footer .brand-col p {
    font-size: 0.88rem;
    line-height: 1.7;
    max-width: 340px;
}

.footer .brand-col p strong {
    color: rgba(255, 255, 255, 0.85);
}

.footer .col h4 {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

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

.footer .col ul li {
    margin-bottom: 7px;
}

.footer .col ul li a {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.55);
    transition: 0.2s;
}

.footer .col ul li a:hover {
    color: var(--accent);
}

.footer .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 16px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 10px;
    font-size: 0.78rem;
}

.footer .footer-bottom .icp {
    color: rgba(255, 255, 255, 0.35);
    text-align: center;
}

.footer .footer-bottom .icp a {
    color: rgba(255, 255, 255, 0.35);
    text-decoration: none;
}

.footer .footer-bottom .icp a:hover {
    color: var(--accent);
}

.footer .footer-bottom .icp .sep {
    margin: 0 8px;
    color: rgba(255, 255, 255, 0.12);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .container { padding: 0 24px; }
    .hero h1 { font-size: 2.5rem; }
    .help-category-grid { grid-template-columns: repeat(3, 1fr); }
    .support-card { grid-template-columns: 1fr; text-align: center; }
    .support-method-item { text-align: left; }
    .footer .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .container { padding: 0 18px; }
    .nav-inner { flex-direction: column; align-items: center; }
    .nav-links { justify-content: center; gap: 10px; }
    .hero-grid { flex-direction: column; text-align: center; }
    .hero-left { min-width: unset; }
    .hero-right { min-width: unset; justify-content: center; }
    .hero h1 { font-size: 2rem; }
    .hero-desc { margin: 0 auto; }
    .hero-actions { justify-content: center; }
    .hero-platforms { justify-content: center; }
    .hero-image-single .img-wrapper { margin-right: 0; }
    .help-category-grid { grid-template-columns: repeat(2, 1fr); }
    .diagnosis-card { padding: 32px 22px; }
    .troubleshoot-node { padding: 16px 16px; }
    .support-card { padding: 32px 22px; }
    .footer .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px; }
    .footer .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    .container { padding: 0 12px; }
    .hero h1 { font-size: 1.7rem; }
    .hero-image-single .img-wrapper img { max-height: 190px; max-width: 270px; }
    .btn-primary, .btn-outline { padding: 11px 22px; font-size: 0.88rem; }
    .help-category-grid { grid-template-columns: 1fr; }
    .help-search-box { padding: 4px 12px; }
    .search-input { font-size: 0.85rem; }
    .hot-topic-xl { font-size: 1.1rem; }
    .hot-topic-lg { font-size: 0.95rem; }
    .hot-topic-md { font-size: 0.82rem; }
    .hot-topic-sm { font-size: 0.7rem; }
    .diagnosis-card { padding: 24px 16px; }
    .diagnosis-step-item { flex-direction: column; text-align: center; gap: 8px; }
    .diagnosis-step-text { text-align: center; }
    .faq-accordion-q { padding: 14px 14px; }
    .faq-q-text { font-size: 0.85rem; }
    .faq-accordion-a { padding: 0 14px; }
    .faq-accordion-item.open .faq-accordion-a { padding: 0 14px 14px; }
    .troubleshoot-node { padding: 14px 12px; }
    .troubleshoot-icon { font-size: 1.3rem; }
    .support-card { padding: 24px 16px; }
    .support-illustration i { font-size: 3rem; }
    .support-illustration strong { font-size: 1.1rem; }
    .footer .footer-grid { grid-template-columns: 1fr; gap: 22px; text-align: center; }
    .footer .brand-col p { max-width: 100%; }
    .cta-box { padding: 30px 20px; }
    .cta-box h2 { font-size: 1.4rem; }
    .diagnosis-btn { width: 100%; justify-content: center; }
}