/* ============================================
   QuickQ快客VPN 常见问题 - 完整样式表
   版本: 2.0 (2026)
   描述: 安装登录与连接使用FAQ自助解答页
   关联文件: faq.html
   ============================================ */

:root {
    --primary: #0284c7;
    --primary-light: #38bdf8;
    --primary-glow: rgba(14, 165, 233, 0.4);
    --bg-deep: #0f172a;
    --bg-card: #1e293b;
    --bg-dark: #0b0f19;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --success: #34d399;
    --warning: #ffc107;
    --danger: #ff5f57;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --shadow-card: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    --radius-lg: 1rem;
    --radius-md: 0.75rem;
    --radius-sm: 0.5rem;
    --container-max: 1300px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--text-secondary);
    background-color: var(--bg-deep);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast), background var(--transition-fast), border var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

::selection {
    background: rgba(56, 189, 248, 0.3);
    color: #ffffff;
}

::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-deep);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* ---------- 头部导航 ---------- */
header {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-light);
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.logo-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    transition: transform 0.4s ease;
}

.logo-link:hover .logo-icon {
    transform: rotate(15deg);
}

nav {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

nav a {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.4rem 0;
    position: relative;
    white-space: nowrap;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-light);
    transition: width var(--transition-base);
}

nav a:hover::after,
nav a.active::after {
    width: 100%;
}

nav a:hover,
nav a.active {
    color: var(--primary-light);
}

/* ---------- FAQ Hero 区 ---------- */
.faq-hero {
    padding: 5rem 1.5rem 3rem;
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: center;
    position: relative;
}

.faq-hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(2, 132, 199, 0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.hero-content {
    position: relative;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: 50px;
    padding: 0.5rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 1.5rem;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(52, 211, 153, 0.8);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.faq-hero h1 {
    font-size: 3rem;
    line-height: 1.15;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 1.25rem;
    letter-spacing: -0.5px;
}

.highlight-text {
    background: linear-gradient(135deg, #ffffff 0%, #38bdf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    max-width: 550px;
    line-height: 1.8;
}

.hero-search {
    margin-bottom: 2rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 0.75rem 1.25rem;
    max-width: 450px;
    gap: 0.75rem;
    transition: all var(--transition-base);
}

.search-box:focus-within {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

.search-icon {
    width: 20px;
    height: 20px;
    color: var(--text-dim);
    flex-shrink: 0;
}

.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-family);
}

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

.search-hint {
    font-size: 0.75rem;
    color: var(--text-dim);
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    white-space: nowrap;
}

.hero-stats {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.stat-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1.25rem;
    min-width: 90px;
    transition: all var(--transition-base);
}

.stat-chip:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
}

.chip-icon {
    font-size: 1.3rem;
    margin-bottom: 0.15rem;
}

.chip-num {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--primary-light);
    letter-spacing: -0.3px;
}

.chip-label {
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* FAQ 插图视觉 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.faq-illustration {
    position: relative;
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.question-mark-large {
    font-size: 8rem;
    font-weight: 900;
    color: rgba(56, 189, 248, 0.2);
    line-height: 1;
    user-select: none;
    animation: question-float 5s ease-in-out infinite;
}

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

.floating-answer {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--primary-light);
    border-radius: 50px;
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-light);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    animation: float-answer 4s ease-in-out infinite;
    white-space: nowrap;
    z-index: 2;
}

.floating-answer-1 {
    top: 5%;
    right: 5%;
    animation-delay: 0s;
}

.floating-answer-2 {
    bottom: 15%;
    left: 0%;
    animation-delay: 1.2s;
}

.floating-answer-3 {
    top: 40%;
    right: 0%;
    animation-delay: 2.4s;
}

@keyframes float-answer {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

.faq-orb {
    position: absolute;
    border-radius: 50%;
    border: 2px dashed rgba(56, 189, 248, 0.3);
    pointer-events: none;
}

.faq-orb-1 {
    width: 220px;
    height: 220px;
    animation: orb-rotate 15s linear infinite;
}

.faq-orb-2 {
    width: 260px;
    height: 260px;
    border-style: dotted;
    animation: orb-rotate-reverse 20s linear infinite;
}

.faq-orb-3 {
    width: 180px;
    height: 180px;
    border-color: rgba(52, 211, 153, 0.2);
    animation: orb-rotate 12s linear infinite;
}

@keyframes orb-rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes orb-rotate-reverse {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(-360deg); }
}

/* ---------- FAQ 分类快速导航 ---------- */
.faq-category-strip {
    background: rgba(30, 41, 59, 0.7);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    backdrop-filter: blur(8px);
    position: sticky;
    top: 70px;
    z-index: 900;
}

.category-strip-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.category-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: all var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.category-pill:hover {
    border-color: var(--primary-light);
    color: var(--text-primary);
}

.category-pill.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
}

.category-icon {
    font-size: 1rem;
}

/* ---------- 热门问题标签云 ---------- */
.hot-topics-section {
    padding-top: 4rem;
    padding-bottom: 2rem;
}

.hot-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    max-width: 700px;
    margin: 0 auto;
}

.hot-tag {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.hot-tag:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
    background: rgba(56, 189, 248, 0.05);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ---------- FAQ 主体分类区 ---------- */
.faq-main-section {
    padding-top: 2rem;
    padding-bottom: 2rem;
}

.faq-category-group {
    margin-bottom: 2rem;
    transition: all var(--transition-base);
}

.faq-category-group[style*="display: none"] {
    opacity: 0;
}

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.category-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-icon-lg {
    font-size: 1.8rem;
}

.category-title h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.2px;
}

.category-count {
    font-size: 0.8rem;
    color: var(--text-dim);
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 0.25rem 0.85rem;
}

.faq-accordion {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
}

.faq-block {
    border-bottom: 1px solid var(--border-color);
    padding: 1.15rem 0;
    cursor: pointer;
    transition: all var(--transition-base);
}

.faq-block:last-child {
    border-bottom: none;
}

.faq-block:hover .faq-title {
    color: var(--primary-light);
}

.faq-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1rem;
    gap: 1rem;
    transition: color var(--transition-fast);
}

.faq-toggle {
    font-size: 1.4rem;
    color: var(--primary-light);
    flex-shrink: 0;
    transition: transform var(--transition-base);
    line-height: 1;
}

.faq-block.open .faq-toggle {
    transform: rotate(45deg);
}

.faq-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base) ease, padding-top var(--transition-base) ease;
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.8;
}

.faq-block.open .faq-body {
    max-height: 500px;
    padding-top: 0.75rem;
}

.faq-body a {
    color: var(--primary-light);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.faq-body a:hover {
    color: #ffffff;
}

/* ---------- 排查决策树板块 ---------- */
.troubleshoot-section {
    background: rgba(30, 41, 59, 0.3);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.troubleshoot-flow {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    align-items: flex-start;
    max-width: 1000px;
    margin: 0 auto;
}

.flow-step {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem 1.25rem;
    text-align: center;
    min-width: 160px;
    flex: 1;
    max-width: 200px;
    transition: all var(--transition-base);
    position: relative;
}

.flow-step:hover {
    border-color: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-card);
}

.flow-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.flow-step h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.4rem;
    font-weight: 700;
}

.flow-step p {
    color: var(--text-muted);
    font-size: 0.8rem;
    line-height: 1.5;
}

.flow-arrow {
    display: block;
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary-light);
    margin-top: 0.5rem;
    animation: arrow-bounce 2s ease-in-out infinite;
}

@keyframes arrow-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(5px); }
}

.flow-success {
    border-color: var(--success);
    background: rgba(52, 211, 153, 0.05);
}

.flow-success .flow-icon {
    animation: success-pop 2s ease-in-out infinite;
}

@keyframes success-pop {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* ---------- 联系支持 CTA 板块 ---------- */
.contact-cta-section {
    padding-top: 4rem;
}

.contact-cta-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2.5rem;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.cta-text h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.3px;
}

.cta-text p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-glow {
    background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    color: #ffffff;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    box-shadow: 0 0 20px var(--primary-glow);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-base);
}

.btn-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(14, 165, 233, 0.6);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    transition: all var(--transition-base);
}

.btn-outline:hover {
    background: rgba(51, 65, 85, 0.4);
    color: #ffffff;
    border-color: var(--primary-light);
}

.cta-support-hours {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.hours-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
}

.hours-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.hours-info {
    display: flex;
    flex-direction: column;
}

.hours-info strong {
    color: var(--text-primary);
    font-size: 0.9rem;
}

.hours-info small {
    color: var(--text-dim);
    font-size: 0.75rem;
}

/* ---------- 页脚 ---------- */
footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border-color);
    color: var(--text-dim);
    padding: 4rem 1.5rem 2rem;
    font-size: 0.88rem;
}

.footer-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
}

.footer-col h5 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 1.25rem;
    font-weight: 700;
}

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

.footer-col li {
    margin-bottom: 0.6rem;
}

.footer-col a {
    color: var(--text-dim);
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--primary-light);
}

.copyright {
    text-align: center;
    max-width: var(--container-max);
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1100px) {
    .faq-hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .faq-hero h1 {
        font-size: 2.5rem;
    }
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    .search-box {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-stats {
        justify-content: center;
    }
    .hero-visual {
        margin-top: 1.5rem;
    }
    .faq-illustration {
        width: 240px;
        height: 240px;
    }
    .question-mark-large {
        font-size: 6rem;
    }
    .contact-cta-card {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .cta-buttons {
        justify-content: center;
    }
    .cta-support-hours {
        max-width: 400px;
        margin: 0 auto;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    nav {
        gap: 1rem;
        flex-wrap: wrap;
    }
    .faq-hero {
        padding: 3rem 1rem 2rem;
    }
    .faq-hero h1 {
        font-size: 2.2rem;
    }
    .container {
        padding: 3rem 1rem;
    }
    .section-header h2 {
        font-size: 1.8rem;
    }
    .faq-category-strip {
        top: 65px;
    }
    .category-strip-inner {
        gap: 0.4rem;
    }
    .category-pill {
        font-size: 0.75rem;
        padding: 0.4rem 0.8rem;
    }
    .faq-accordion {
        padding: 1.25rem;
    }
    .troubleshoot-flow {
        flex-direction: column;
        align-items: center;
    }
    .flow-step {
        max-width: 300px;
        width: 100%;
    }
    .flow-arrow {
        transform: rotate(90deg);
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .hero-stats {
        gap: 0.75rem;
    }
    .stat-chip {
        padding: 0.6rem 1rem;
        min-width: 80px;
    }
}

@media (max-width: 480px) {
    .faq-hero h1 {
        font-size: 1.9rem;
    }
    .search-box {
        padding: 0.6rem 1rem;
    }
    .search-hint {
        display: none;
    }
    .category-strip-inner {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 0.25rem;
    }
    .category-pill {
        flex-shrink: 0;
    }
    .hot-tags {
        gap: 0.5rem;
    }
    .hot-tag {
        font-size: 0.75rem;
        padding: 0.4rem 1rem;
    }
    .contact-cta-card {
        padding: 2rem 1.5rem;
    }
    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }
    .cta-buttons a {
        width: 100%;
        justify-content: center;
    }
    .faq-illustration {
        width: 200px;
        height: 200px;
    }
    .question-mark-large {
        font-size: 5rem;
    }
}