/* ============================================
   Radmin 中文网站 - 全局公共样式
   主题色: #F68921 (橙色) / #0066B3 (蓝色)
   ============================================ */

/* --- CSS 变量 --- */
:root {
    --color-primary: #F68921;
    --color-secondary: #0066B3;
    --color-primary-light: #FFA54C;
    --color-primary-dark: #E07610;
    --color-secondary-light: #1A8AD8;
    --color-secondary-dark: #004F8A;
    --color-bg: #FFFFFF;
    --color-bg-light: #F7F9FC;
    --color-bg-alt: #F0F4F8;
    --color-text: #1A1A2E;
    --color-text-secondary: #4A5568;
    --color-text-muted: #718096;
    --color-border: #E2E8F0;
    --color-border-light: #EDF2F7;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Courier New", monospace;
    --max-width: 1200px;
    --nav-height: 72px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary-light);
}

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

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
    color: var(--color-text);
}

/* --- 容器 --- */
.container {
    width: 100%;
    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: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.4;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #FFFFFF;
    box-shadow: 0 4px 15px rgba(246, 137, 33, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: #FFFFFF;
    box-shadow: 0 6px 22px rgba(246, 137, 33, 0.45);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-secondary);
    border: 2px solid var(--color-secondary);
}

.btn-outline:hover {
    background: var(--color-secondary);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 102, 179, 0.3);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 17px;
    border-radius: var(--radius-md);
}

/* --- 区域标题 --- */
.section-title {
    text-align: center;
    margin-bottom: 56px;
}

.section-title h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--color-text), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title p {
    font-size: 18px;
    color: var(--color-text-secondary);
    max-width: 640px;
    margin: 0 auto;
}

/* ============================================
   导航 / 页脚 全站通用组件样式
   ============================================ */

/* --- 导航栏 --- */
.site-nav { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height); background: rgba(255,255,255,0.92); -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); z-index: 1000; transition: all var(--transition-normal); border-bottom: 1px solid transparent; }
.site-nav.scrolled { background: rgba(255,255,255,0.98); border-bottom-color: var(--color-border-light); box-shadow: var(--shadow-sm); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; flex-shrink: 0; }
.nav-logo { height: 38px; width: auto; }
.nav-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-brand-name { font-size: 20px; font-weight: 800; color: var(--color-text); letter-spacing: -0.3px; }
.nav-brand-sub { font-size: 11px; color: var(--color-text-muted); font-weight: 400; }
.nav-menu { display: flex; align-items: center; list-style: none; gap: 8px; margin: 0; padding: 0; }
.nav-menu-link { display: block; padding: 8px 18px; font-size: 15px; font-weight: 500; color: var(--color-text-secondary); text-decoration: none; border-radius: var(--radius-sm); transition: all var(--transition-fast); position: relative; }
.nav-menu-link:hover { color: var(--color-secondary); background: rgba(0,102,179,0.06); }
.nav-menu-link.active { color: var(--color-secondary); font-weight: 600; }
.nav-menu-link.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; background: var(--color-secondary); border-radius: 2px; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-actions .btn { padding: 9px 20px; font-size: 14px; }
.nav-actions .btn svg { width: 16px; height: 16px; }
.nav-btn-download { border-width: 1.5px; }

/* ===== 语言切换器（桌面） ===== */
.nav-lang { position: relative; }
.nav-lang-trigger { display: inline-flex; align-items: center; gap: 6px; padding: 8px 12px; background: none; border: 1px solid var(--color-border-light); border-radius: var(--radius-md); color: var(--color-text); font-size: 13px; font-weight: 600; cursor: pointer; transition: all var(--transition-fast); white-space: nowrap; }
.nav-lang-trigger:hover { border-color: var(--color-secondary); color: var(--color-secondary); background: rgba(0,102,179,0.04); }
.nav-lang-trigger svg { width: 16px; height: 16px; stroke-width: 2; }
.nav-lang-trigger .nav-lang-caret { width: 12px; height: 12px; transition: transform var(--transition-fast); }
.nav-lang.open .nav-lang-trigger { border-color: var(--color-secondary); color: var(--color-secondary); }
.nav-lang.open .nav-lang-caret { transform: rotate(180deg); }
.nav-lang-menu { position: absolute; top: calc(100% + 8px); right: 0; min-width: 200px; background: #FFFFFF; border: 1px solid var(--color-border-light); border-radius: var(--radius-md); box-shadow: 0 10px 30px rgba(0,0,0,0.12); list-style: none; padding: 6px; margin: 0; opacity: 0; visibility: hidden; transform: translateY(-4px); transition: all var(--transition-fast); z-index: 1100; }
.nav-lang.open .nav-lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-lang-option { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; color: var(--color-text); font-size: 14px; text-decoration: none; border-radius: var(--radius-sm); transition: background var(--transition-fast); }
.nav-lang-option:hover { background: var(--color-bg-light); color: var(--color-secondary); }
.nav-lang-option.active { color: var(--color-secondary); font-weight: 600; background: rgba(0,102,179,0.06); }
.nav-lang-check { width: 16px; height: 16px; stroke: var(--color-secondary); flex-shrink: 0; }

/* ===== 语言切换器（移动端） ===== */
.nav-mobile-lang { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--color-border-light); }
.nav-mobile-lang-title { font-size: 12px; font-weight: 700; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.6px; margin-bottom: 10px; padding: 0 12px; }
.nav-mobile-lang-item { display: flex; align-items: center; justify-content: space-between; padding: 12px 14px; border-radius: var(--radius-sm); color: var(--color-text); font-size: 15px; text-decoration: none; transition: background var(--transition-fast); }
.nav-mobile-lang-item:hover { background: var(--color-bg-light); }
.nav-mobile-lang-item.active { color: var(--color-secondary); font-weight: 600; background: rgba(0,102,179,0.06); }
.nav-mobile-lang-item svg { width: 18px; height: 18px; stroke: var(--color-secondary); }
.nav-hamburger { display: none; flex-direction: column; justify-content: center; align-items: center; width: 44px; height: 44px; background: none; border: none; cursor: pointer; padding: 0; gap: 5px; z-index: 1001; }
.hamburger-line { display: block; width: 22px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition-normal); transform-origin: center; }
.nav-hamburger.active .hamburger-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.active .hamburger-line:nth-child(2) { opacity: 0; }
.nav-hamburger.active .hamburger-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
.nav-mobile-backdrop { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(15,23,42,0.5); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); opacity: 0; transition: opacity var(--transition-normal); z-index: 9998; }
.nav-mobile-backdrop.open { opacity: 1; }
.nav-mobile-menu { display: none; position: fixed; top: 0; right: 0; bottom: 0; width: 85%; max-width: 340px; background: #FFFFFF; padding: 24px 24px 32px; overflow-y: auto; transform: translateX(100%); transition: transform var(--transition-normal); box-shadow: -10px 0 40px rgba(0,0,0,0.15); z-index: 9999; }
.nav-mobile-menu.open { transform: translateX(0); }
.nav-mobile-header { display: flex; align-items: center; justify-content: space-between; padding-bottom: 20px; margin-bottom: 16px; border-bottom: 1px solid var(--color-border-light); }
.nav-mobile-title { font-size: 16px; font-weight: 700; color: var(--color-text); }
.nav-mobile-close { width: 36px; height: 36px; border-radius: 50%; background: var(--color-bg-light); border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; color: var(--color-text-secondary); transition: all var(--transition-fast); }
.nav-mobile-close:hover { background: var(--color-border-light); color: var(--color-text); transform: rotate(90deg); }
.nav-mobile-close svg { width: 18px; height: 18px; }
.nav-mobile-list { list-style: none; padding: 0; margin: 0 0 24px 0; }
.nav-mobile-list .nav-menu-item { border-bottom: 1px solid var(--color-border-light); }
.nav-mobile-list .nav-menu-link { display: block; padding: 16px 8px; font-size: 17px; }
.nav-mobile-list .nav-menu-link.active::after { display: none; }
.nav-mobile-list .nav-menu-link.active { color: var(--color-secondary); background: rgba(0,102,179,0.06); border-radius: var(--radius-sm); }
.nav-mobile-actions { display: flex; flex-direction: column; gap: 12px; }
.nav-spacer { height: var(--nav-height); }
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .nav-actions { display: none; }
    .nav-hamburger { display: flex; }
    .nav-mobile-menu { display: block; }
    .nav-mobile-backdrop { display: block; pointer-events: none; }
    .nav-mobile-backdrop.open { pointer-events: auto; }
    .nav-logo { height: 32px; }
    .nav-brand-name { font-size: 18px; }
}

/* --- 页脚 --- */
.site-footer { background: var(--color-text); color: #CBD5E0; padding: 0; margin-top: 0; }
.footer-inner { padding: 56px 24px 32px; }
.footer-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 48px; flex-wrap: wrap; }
.footer-brand { max-width: 400px; }
.footer-brand-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-logo { height: 36px; width: auto; filter: brightness(0) invert(1); opacity: 0.9; }
.footer-brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.footer-brand-name { font-size: 18px; font-weight: 700; color: #FFFFFF; }
.footer-brand-sub { font-size: 11px; color: #A0AEC0; font-weight: 400; }
.footer-desc { font-size: 14px; line-height: 1.7; color: #A0AEC0; }
.footer-contact { min-width: 260px; }
.footer-contact-title { font-size: 15px; font-weight: 600; color: #FFFFFF; margin-bottom: 16px; }
.footer-contact-item { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; font-size: 14px; }
.footer-contact-item svg { width: 18px; height: 18px; flex-shrink: 0; stroke: var(--color-primary); }
.footer-contact-item a { color: #CBD5E0; text-decoration: none; transition: color var(--transition-fast); }
.footer-contact-item a:hover { color: var(--color-primary); }
.footer-divider { height: 1px; background: rgba(255,255,255,0.1); margin: 36px 0 24px; }
.footer-bottom { text-align: center; }
.footer-copyright { font-size: 14px; color: #A0AEC0; margin-bottom: 8px; }
.footer-notice { font-size: 12px; color: #718096; line-height: 1.7; }
.footer-notice strong { color: #CBD5E0; font-weight: 600; }
.footer-notice-en { margin-top: 8px; font-style: italic; opacity: 0.85; }
@media (max-width: 768px) {
    .footer-top { flex-direction: column; gap: 32px; }
    .footer-brand { max-width: 100%; }
    .footer-inner { padding: 40px 16px 24px; }
}

/* --- 页面通用横幅 page-hero --- */
.page-hero {
    position: relative;
    padding: 80px 0 64px;
    background: linear-gradient(165deg, #F7F9FC 0%, #FFFFFF 45%, #EBF4FF 100%);
    overflow: hidden;
    text-align: center;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -180px;
    right: -180px;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 102, 179, 0.07) 0%, transparent 70%);
    pointer-events: none;
}

.page-hero::after {
    content: '';
    position: absolute;
    bottom: -120px;
    left: -120px;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(246, 137, 33, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.page-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 760px;
    margin: 0 auto;
}

.page-hero-eyebrow {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(0, 102, 179, 0.08);
    color: var(--color-secondary);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 0.3px;
}

.page-hero h1 {
    font-size: 44px;
    font-weight: 800;
    margin-bottom: 18px;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--color-text) 30%, var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-hero p {
    font-size: 18px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .page-hero {
        padding: 56px 0 44px;
    }
    .page-hero h1 {
        font-size: 30px;
    }
    .page-hero p {
        font-size: 15px;
    }
}

/* --- 动画 --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-fade-in-up {
    animation: fadeInUp 0.7s ease forwards;
}

.animate-fade-in {
    animation: fadeIn 0.7s ease forwards;
}

/* --- 响应式 --- */
@media (max-width: 1024px) {
    :root {
        --max-width: 960px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    .container {
        padding: 0 16px;
    }
    .section-title h2 {
        font-size: 28px;
    }
    .section-title p {
        font-size: 16px;
    }
    .btn-lg {
        padding: 14px 28px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    .section-title h2 {
        font-size: 24px;
    }
}