/* ============================================================
   公共样式 — 所有页面共享
   导航栏、容器、卡片、按钮、图标、页脚、响应式
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a56db;
    --primary-light: #3b82f6;
    --primary-lighter: #93bbfc;
    --primary-bg: #eff6ff;
    --success: #16a34a;
    --warning: #f59e0b;
    --danger: #dc2626;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.10);
    --transition: 0.25s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    padding-top: 72px;
}

a {
    color: var(--primary);
    text-decoration: none;
}
a:hover {
    color: var(--primary-light);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

/* -------- 导航栏 -------- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
    flex-shrink: 0;
}
.navbar .brand .logo-icon {
    display: inline-block;
    width: 32px; height: 32px;
}
.navbar .brand .brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}
.navbar .brand .brand-name {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
}
.navbar .brand .brand-domain {
    font-size: 11px;
    font-weight: 400;
    color: var(--gray-400);
    letter-spacing: 0.3px;
    margin-top: 1px;
}

.nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
    flex-wrap: wrap;
}
.nav-links li a {
    display: block;
    padding: 8px 18px;
    border-radius: 40px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    background: transparent;
    white-space: nowrap;
}
.nav-links li a:hover {
    color: var(--primary);
    background: var(--primary-bg);
}
.nav-links li a.active {
    color: #fff;
    background: var(--primary);
    box-shadow: 0 2px 12px rgba(26, 86, 219, 0.30);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 6px;
    cursor: pointer;
}
.menu-toggle span {
    display: block;
    width: 26px; height: 3px;
    background: var(--gray-700);
    border-radius: 4px;
    transition: var(--transition);
}
.menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

/* -------- 容器 -------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

/* -------- 卡片 -------- */
.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px 30px;
    margin-bottom: 28px;
    transition: var(--transition);
}
.card:hover {
    box-shadow: var(--shadow-hover);
}
.card-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.card-title .badge {
    font-size: 13px;
    font-weight: 500;
    background: var(--primary-bg);
    color: var(--primary);
    padding: 2px 14px;
    border-radius: 40px;
    margin-left: 4px;
}

/* -------- 按钮 -------- */
.btn {
    padding: 10px 28px;
    border-radius: 40px;
    border: none;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 12px rgba(26, 86, 219, 0.25);
}
.btn-primary:hover {
    background: #1a4bb8;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(26, 86, 219, 0.30);
}
.btn-outline {
    background: transparent;
    color: var(--gray-600);
    border: 1.5px solid var(--gray-300);
}
.btn-outline:hover {
    border-color: var(--gray-400);
    background: var(--gray-50);
}

/* -------- SVG 图标 -------- */
.icon-svg {
    display: inline-block;
    width: 1.2em; height: 1.2em;
    vertical-align: -0.15em;
    fill: #1a56db;
    stroke: #1a56db;
}
.icon-img {
    display: inline-block;
    width: 1.2em; height: 1.2em;
    vertical-align: -0.15em;
    filter: invert(36%) sepia(75%) saturate(1500%) hue-rotate(200deg) brightness(95%) contrast(90%);
}
.nav-links .icon-svg,
.nav-links .icon-img {
    width: 1.1em; height: 1.1em;
    margin-right: 4px;
}
.feature-item .icon-svg,
.feature-item .icon-img {
    width: 48px; height: 48px;
    margin-bottom: 12px;
}
.card-title .icon-svg,
.card-title .icon-img {
    width: 1.3em; height: 1.3em;
    margin-right: 6px;
}
.btn .icon-svg,
.btn .icon-img {
    width: 1.1em; height: 1.1em;
    margin-right: 6px;
}
.modal-box h3 .icon-svg,
.modal-box h3 .icon-img {
    width: 1.4em; height: 1.4em;
    margin-right: 8px;
}
.nav-links li a:hover .icon-svg,
.nav-links li a:hover .icon-img,
.feature-item:hover .icon-svg,
.feature-item:hover .icon-img {
    filter: invert(55%) sepia(60%) saturate(1200%) hue-rotate(200deg) brightness(105%) contrast(95%);
}
.nav-links li a.active .icon-svg,
.nav-links li a.active .icon-img {
    filter: invert(100%) sepia(0%) saturate(0%) hue-rotate(0deg) brightness(100%) contrast(100%);
}

/* -------- 页脚 -------- */
.footer {
    text-align: center;
    padding: 28px 20px 16px;
    color: var(--gray-400);
    font-size: 14px;
    border-top: 1px solid var(--gray-200);
    margin-top: 20px;
}
.footer a { color: var(--gray-500); }
.footer a:hover { color: var(--primary); }

/* -------- 响应式（导航 & 基础） -------- */
@media (max-width: 820px) {
    .navbar {
        padding: 0 16px;
        height: 64px;
    }
    body {
        padding-top: 64px;
    }
    .navbar .brand .brand-name { font-size: 18px; }
    .navbar .brand .brand-domain { font-size: 10px; }
    .navbar .brand .logo-icon { width: 32px; height: 32px; font-size: 16px; }

    .nav-links {
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 12px 20px 24px;
        gap: 4px;
        border-bottom: 1px solid var(--gray-200);
        display: none;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    }
    .nav-links.open { display: flex; }
    .nav-links li a {
        padding: 12px 16px;
        font-size: 16px;
        border-radius: 10px;
        width: 100%;
        text-align: center;
    }
    .menu-toggle { display: flex; }

    .container { padding: 16px 14px 40px; }
    .card { padding: 20px 18px; }
}

@media (max-width: 480px) {
    .card { padding: 16px 14px; }
}