/* ============================================================
   Auth Brand Theme - 主样式表
   简洁现代、响应式、不依赖外部UI框架
   字体：系统字体栈 + Inter (Google Fonts)
   ============================================================ */

/* ---------- 基础重置与变量 ---------- */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary: #0ea5e9;
    --accent: #8b5cf6;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --text: #1f2937;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
    --radius: 12px;
    --radius-sm: 8px;
    --max-width: 1200px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ---------- 容器 ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ---------- 头部 ---------- */
.site-header {
    background: var(--bg);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.85);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.site-logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.site-logo:hover {
    color: var(--primary);
}

.site-nav .nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.site-nav .nav-menu a {
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 4px 0;
    position: relative;
}

.site-nav .nav-menu a:hover {
    color: var(--primary);
}

.site-nav .nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ---------- 主体 ---------- */
.site-main {
    flex: 1;
}

/* ---------- 英雄区 ---------- */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(79,70,229,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    right: -10%;
    width: 50%;
    height: 80%;
    background: radial-gradient(circle, rgba(139,92,246,0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    color: var(--text);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 560px;
    margin: 0 auto 40px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- 特性卡片 ---------- */
.features {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 48px;
    color: var(--text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 32px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border);
}

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text);
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.92rem;
    line-height: 1.65;
}

/* ---------- 合作伙伴 ---------- */
.partners {
    padding: 60px 0;
    background: var(--bg-alt);
    overflow: hidden;
}

.partners-marquee {
    position: relative;
    width: 100%;
    overflow: hidden;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.partners-track {
    display: flex;
    gap: 48px;
    align-items: center;
    width: max-content;
    animation: marquee-scroll 30s linear infinite;
}

.partners-track:hover {
    animation-play-state: paused;
}

@keyframes marquee-scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.partner-item {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 16px 32px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.3s ease;
    min-width: 140px;
    height: 60px;
}

.partner-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.partner-item img {
    max-height: 32px;
    width: auto;
    object-fit: contain;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all 0.3s;
}

.partner-item:hover img {
    filter: grayscale(0%);
    opacity: 1;
}

.partner-name {
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.95rem;
    white-space: nowrap;
    transition: color 0.3s;
}

.partner-item:hover .partner-name {
    color: var(--primary);
}

.partner-empty {
    background: transparent;
    border: 1px dashed var(--border);
}

.partner-empty .partner-name {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ---------- 联系区域 ---------- */
.contact {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-info h3,
.contact-form-wrap h3 {
    font-size: 1.2rem;
    margin-bottom: 16px;
    color: var(--text);
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 8px;
}

.contact-email {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
}

/* ---------- 表单 ---------- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    transition: all 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-hint {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ---------- 隐私政策与用户协议复选框 ---------- */
.terms-group {
    margin: 20px 0 8px;
}

.terms-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    font-size: 0.88rem;
    line-height: 1.5;
    color: var(--text-light);
    user-select: none;
}

.terms-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    min-width: 18px;
    margin-top: 1px;
    accent-color: var(--primary);
    cursor: pointer;
}

.terms-text {
    flex: 1;
}

.terms-text a {
    color: var(--primary);
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.terms-text a:hover {
    border-bottom-color: var(--primary);
}

@media (max-width: 480px) {
    .terms-label {
        font-size: 0.82rem;
    }
}

.form-message {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.form-message.success {
    background: rgba(16,185,129,0.08);
    color: var(--success);
    border: 1px solid rgba(16,185,129,0.2);
}

.form-message.error {
    background: rgba(239,68,68,0.08);
    color: var(--error);
    border: 1px solid rgba(239,68,68,0.2);
}

/* ---------- 认证页面 ---------- */
.auth-page {
    padding: 80px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 64px - 200px);
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 48px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}

.auth-title {
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    color: var(--text);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-light);
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ---------- 内容页面 ---------- */
.content-page {
    padding: 60px 0 80px;
}

.content-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 48px;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: var(--shadow);
}

.content-card h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.content-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 32px 0 12px;
    color: var(--text);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-light);
}

.content-card p {
    color: var(--text-light);
    margin-bottom: 12px;
    line-height: 1.7;
}

.content-card ul {
    margin: 12px 0 20px 20px;
    color: var(--text-light);
}

.content-card ul li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.last-updated {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* ---------- 文档页面 ---------- */
.docs-page .container {
    max-width: 900px;
}

.docs-header {
    text-align: center;
    margin-bottom: 48px;
    padding: 40px 0;
    border-bottom: 1px solid var(--border-light);
}

.docs-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.docs-header p {
    color: var(--text-light);
    margin-bottom: 16px;
}

.api-base-url {
    display: inline-block;
    background: var(--bg-alt);
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-light);
}

.docs-section {
    margin-bottom: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--border-light);
}

.docs-section:last-child {
    border-bottom: none;
}

.docs-section h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text);
}

.docs-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 24px 0 12px;
    color: var(--text);
}

.endpoint-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding: 12px 16px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.method-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.method-badge.get {
    background: rgba(16,185,129,0.12);
    color: #059669;
}

.method-badge.post {
    background: rgba(79,70,229,0.12);
    color: var(--primary);
}

/* ---------- 表格 ---------- */
.docs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
    font-size: 0.9rem;
}

.docs-table th,
.docs-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.docs-table th {
    font-weight: 600;
    color: var(--text);
    background: var(--bg-alt);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.docs-table td {
    color: var(--text-light);
}

.docs-table code {
    background: var(--bg-alt);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--primary);
}

/* ---------- 代码块 ---------- */
.code-tabs {
    margin: 16px 0 24px;
}

.code-block {
    margin-bottom: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.code-label {
    background: var(--bg-alt);
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.code-block pre {
    padding: 16px;
    overflow-x: auto;
    background: #1e293b;
    color: #e2e8f0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}

.code-block pre code {
    background: none;
    padding: 0;
    color: inherit;
}

docs-section > pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    margin: 16px 0 24px;
}

/* ---------- 页脚 ---------- */
.site-footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border-light);
    padding: 48px 0 24px;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

.footer-brand p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-light);
    font-size: 0.9rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-light);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
    }

    .site-nav {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border-light);
        padding: 16px 24px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
    }

    .site-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .site-nav .nav-menu {
        flex-direction: column;
        gap: 16px;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .auth-card,
    .content-card {
        padding: 32px 24px;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .partners-grid {
        gap: 16px;
    }

    .docs-section h2 {
        font-size: 1.2rem;
    }

    .endpoint-header {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 60px 0 50px;
    }

    .features,
    .contact {
        padding: 50px 0;
    }
}


/* ---------- Logo图片样式 ---------- */
.site-logo .logo-img {
    max-height: 36px;
    width: auto;
    object-fit: contain;
    display: block;
}

/* ---------- 合作伙伴区域美化 ---------- */
.partners {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-alt) 0%, #f0f4ff 100%);
    position: relative;
    overflow: hidden;
}

.partners::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle, rgba(79,70,229,0.04) 0%, transparent 70%);
    pointer-events: none;
}

.partners .section-title {
    margin-bottom: 40px;
}

.partners-marquee {
    position: relative;
    width: 100%;
    overflow: hidden;
    padding: 20px 0;
}

.partners-track {
    display: flex;
    gap: 40px;
    align-items: center;
    width: max-content;
    animation: marquee-scroll 25s linear infinite;
}

.partners-track:hover {
    animation-play-state: paused;
}

@keyframes marquee-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.partner-item {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 20px 36px;
    background: var(--bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    text-decoration: none;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 160px;
    height: 72px;
    box-shadow: var(--shadow-sm);
}

.partner-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px) scale(1.02);
}

.partner-item img {
    max-height: 36px;
    width: auto;
    object-fit: contain;
    transition: all 0.3s;
}

.partner-name {
    font-weight: 600;
    color: var(--text-light);
    font-size: 1rem;
    white-space: nowrap;
    transition: color 0.3s;
}

.partner-item:hover .partner-name {
    color: var(--primary);
}

.partner-empty {
    background: transparent;
    border: 2px dashed var(--border);
    box-shadow: none;
}

.partner-empty .partner-name {
    font-size: 0.9rem;
    color: var(--text-muted);
}