/*
 * ============================================================
 *  主题：Flat Palette（扁平化浅色调）
 *  版本：1.0
 *  适用：云主机分发平台
 *  配色：浅绿 · 淡黄 · 天蓝
 *  风格：扁平化，高对比文字，友善视效
 * ============================================================
 *
 *  主题说明：
 *  - 去除新拟态阴影，使用轻柔边框与微阴影构建清晰层级
 *  - 背景采用淡绿白，主色调为天蓝与浅绿，强调元素使用淡黄
 *  - 文字颜色均保证 WCAG AA 级对比度
 *  - 完全遵循开发文档中规定的所有 CSS 类名
 */

:root {
    /* 主题核心色 */
    --bg: #f2f7f2;                /* 淡绿白背景 */
    --surface: #ffffff;          /* 卡片/面板表面色 */
    --fg: #1e2a2e;               /* 主文字色（深灰绿） */
    --muted: #5f6b6e;            /* 次要文字 */
    --border: #dce8e0;           /* 边框色（淡绿） */

    /* 品牌色 */
    --primary: #38bdf8;          /* 天蓝主色 */
    --primary-hover: #0ea5e9;    /* 天蓝悬停 */
    --primary-light: #e0f2fe;    /* 天蓝浅色背景 */
    --accent: #10b981;           /* 浅绿强调色 */
    --accent-hover: #059669;     /* 浅绿悬停 */
    --accent-light: #d1fae5;     /* 浅绿淡背景 */
    --highlight: #fbbf24;        /* 淡黄高亮/强调 */
    --highlight-hover: #f59e0b;
    --highlight-light: #fef3c7;

    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* 圆角 */
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition: 0.2s ease;
}

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

body {
    background: var(--bg);
    color: var(--fg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

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

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

.app { min-height: 100vh; display: flex; flex-direction: column; }

/* ===== Header ===== */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
}
.header-inner {
    max-width: 1200px; margin: 0 auto;
    padding: 0 24px; height: 64px;
    display: flex; align-items: center; justify-content: space-between;
}
.logo {
    font-size: 1.4rem; font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.5px;
}
.nav { display: flex; gap: 6px; align-items: center; }
.nav a {
    padding: 8px 16px; border-radius: var(--radius-sm);
    color: var(--muted); font-weight: 600; font-size: 0.92rem;
    transition: all var(--transition);
    border: 1px solid transparent;
}
.nav a:hover {
    color: var(--primary-hover);
    background: var(--primary-light);
    border-color: var(--primary);
}
.nav a:active {
    background: var(--primary-light);
    color: var(--primary-hover);
}

/* ===== Main ===== */
.main { flex: 1; max-width: 1200px; width: 100%; margin: 0 auto; padding: 40px 24px; }

/* ===== Footer ===== */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 28px;
    text-align: center;
    color: var(--muted);
}
.footer-inner { max-width: 1200px; margin: 0 auto; font-size: 0.88rem; }
.footer-inner p { opacity: 0.9; }

/* ===== Announcement ===== */
.announcement-bar {
    background: var(--highlight);
    color: #1e293b;
    padding: 12px 24px;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
    border-bottom: 1px solid #fcd34d;
}
.announcement-inner { max-width: 1200px; margin: 0 auto; }

/* ===== Buttons ===== */
.btn-primary {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 28px; border: none; border-radius: var(--radius);
    background: var(--primary); color: #ffffff;
    font-size: 0.98rem; font-weight: 700; cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.3px;
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.3);
}
.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.4);
    transform: translateY(-1px);
}
.btn-primary:active {
    background: #0284c7;
    transform: translateY(0);
}
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-secondary {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 28px; border: 2px solid var(--border); border-radius: var(--radius);
    background: var(--surface); color: var(--fg);
    font-size: 0.98rem; font-weight: 700; cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.3px;
}
.btn-secondary:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}
.btn-secondary:active {
    background: var(--accent-light);
    border-color: var(--accent-hover);
}

.btn-sm { padding: 6px 16px; font-size: 0.85rem; border-radius: var(--radius-sm); }

/* ===== Messages ===== */
.msg { padding: 14px 20px; border-radius: var(--radius); margin-bottom: 20px; font-size: 0.92rem; font-weight: 500; }
.msg-error {
    background: #fee2e2;
    color: #b91c1c;
    border-left: 4px solid var(--danger);
}
.msg-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success);
}
.msg-warn {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning);
}

/* ===== Hero ===== */
.hero {
    display: flex; align-items: center; justify-content: center;
    min-height: 60vh; text-align: center; padding: 60px 24px;
    background: linear-gradient(135deg, #f0fdf4 0%, #e0f2fe 100%);
}
.hero-content {
    max-width: 700px;
}
.hero-title {
    font-size: 3.2rem; font-weight: 900; color: var(--fg); margin-bottom: 16px; letter-spacing: -1px;
}
.hero-title span {
    color: var(--accent);
}
.hero-desc { font-size: 1.2rem; color: var(--muted); max-width: 580px; margin: 0 auto 40px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Features ===== */
.features { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 2.2rem; font-weight: 800; color: var(--fg); margin-bottom: 12px; }
.section-title p { color: var(--muted); font-size: 1.1rem; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
}
.feature-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 20px rgba(0,0,0,0.04);
    transform: translateY(-4px);
}
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.2rem; margin-bottom: 10px; color: var(--fg); }
.feature-card p { color: var(--muted); font-size: 0.92rem; line-height: 1.7; }

/* ===== Steps ===== */
.how-it-works { padding: 80px 0; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; }
.step {
    text-align: center; padding: 28px 20px; background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}
.step:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.05);
}
.step-num {
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--accent);
    color: #fff; display: inline-flex; align-items: center; justify-content: center;
    font-size: 1.3rem; font-weight: 800; margin-bottom: 16px;
}
.step h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--fg); }
.step p { color: var(--muted); font-size: 0.88rem; }

/* ===== Auth ===== */
.auth-container { display: flex; align-items: center; justify-content: center; min-height: 70vh; padding: 40px 24px; }
.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px;
    max-width: 440px; width: 100%;
    box-shadow: 0 12px 30px rgba(0,0,0,0.05);
}
.auth-tabs {
    display: flex; margin-bottom: 28px; border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg);
    padding: 4px;
    gap: 4px;
}
.auth-tab {
    flex: 1; padding: 12px; text-align: center; color: var(--muted); font-weight: 600; font-size: 0.95rem;
    transition: all var(--transition); border-radius: var(--radius-sm);
    background: transparent;
}
.auth-tab.active {
    color: #fff;
    background: var(--primary);
}
.auth-form .form-group { margin-bottom: 18px; }
.auth-form label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.9rem; color: var(--fg); }
.auth-form input[type="text"], .auth-form input[type="email"], .auth-form input[type="password"] {
    width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: var(--surface); font-size: 0.95rem; outline: none; color: var(--fg);
    transition: border-color var(--transition);
}
.auth-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}
.captcha-row, .code-row { display: flex; gap: 12px; align-items: center; }
.captcha-row input, .code-row input { flex: 1; }
.captcha-img { height: 44px; border-radius: var(--radius-sm); cursor: pointer; border: 1px solid var(--border); }
.btn-send-code {
    padding: 10px 16px; border: none; border-radius: var(--radius-sm);
    background: var(--accent); color: #fff; font-size: 0.85rem; font-weight: 600;
    cursor: pointer; white-space: nowrap;
    transition: background var(--transition);
}
.btn-send-code:hover { background: var(--accent-hover); }
.btn-send-code:disabled { opacity: 0.6; cursor: not-allowed; }
.auth-switch { text-align: center; margin-top: 24px; color: var(--muted); font-size: 0.9rem; }

/* ===== Cart ===== */
.page-header { text-align: center; margin-bottom: 40px; }
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 10px; color: var(--fg); }
.page-header p { color: var(--muted); font-size: 1.05rem; }
.user-points-bar {
    display: flex; align-items: center; justify-content: space-between; padding: 16px 24px;
    border-radius: var(--radius); margin-bottom: 32px; background: var(--surface);
    border: 1px solid var(--border);
    font-weight: 600;
}
.user-points-bar strong {
    color: var(--accent);
    font-size: 1.3rem;
}
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.product-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px 24px; text-align: center;
    transition: all var(--transition); display: flex; flex-direction: column;
}
.product-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 20px rgba(0,0,0,0.06);
    transform: translateY(-4px);
}
.product-name { font-size: 1.3rem; font-weight: 700; margin-bottom: 10px; color: var(--fg); }
.product-price {
    font-size: 2.2rem; font-weight: 900;
    color: var(--accent);
    margin-bottom: 20px;
}
.product-price span { font-size: 0.9rem; font-weight: 500; color: var(--muted); }
.product-features { list-style: none; text-align: left; margin-bottom: 24px; flex: 1; }
.product-features li {
    padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 0.92rem;
    color: var(--fg);
}
.product-features li::before { content: '✓ '; color: var(--success); font-weight: bold; margin-right: 8px; }
.empty-state { text-align: center; padding: 80px 20px; color: var(--muted); grid-column: 1/-1; }

/* ===== Panel ===== */
.panel-grid { display: grid; grid-template-columns: 280px 1fr; gap: 24px; }
.panel-sidebar { position: sticky; top: 88px; align-self: start; }
.user-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px; text-align: center;
    margin-bottom: 16px;
}
.user-avatar {
    width: 68px; height: 68px; border-radius: 50%;
    background: var(--primary);
    color: #fff; display: inline-flex; align-items: center; justify-content: center;
    font-size: 1.5rem; font-weight: 800; margin-bottom: 12px;
}
.user-name { font-size: 1.15rem; font-weight: 700; color: var(--fg); margin-bottom: 4px; }
.user-email { color: var(--muted); font-size: 0.85rem; margin-bottom: 10px; }
.user-points {
    font-size: 1.1rem; font-weight: 700;
    color: var(--accent);
}
.panel-nav { display: flex; flex-direction: column; gap: 8px; }
.panel-nav-item {
    display: block; padding: 12px 20px; border-radius: var(--radius-sm);
    color: var(--fg); font-weight: 600; font-size: 0.92rem;
    background: transparent; border: 1px solid transparent;
    transition: all var(--transition);
}
.panel-nav-item:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}
.panel-nav-item.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.section-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px; margin-bottom: 20px;
}
.section-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--fg); margin-bottom: 20px; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.section-header h3 { margin-bottom: 0; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.9rem; color: var(--fg); }
.form-group input, .form-group select {
    width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: var(--surface); font-size: 0.95rem; outline: none; color: var(--fg);
    transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.info-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem;
}
.info-row span:first-child { color: var(--muted); }

.points-packages { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; }
.pkg-card {
    text-align: center; padding: 20px 14px; border-radius: var(--radius);
    background: var(--surface); border: 1px solid var(--border);
    transition: all var(--transition);
}
.pkg-card:hover {
    border-color: var(--highlight);
    background: var(--highlight-light);
    transform: translateY(-3px);
}
.pkg-points {
    font-size: 1.3rem; font-weight: 800;
    color: var(--accent);
    margin-bottom: 8px;
}
.pkg-price { font-size: 1rem; color: var(--fg); font-weight: 600; margin-bottom: 12px; }

.vhost-list { display: flex; flex-direction: column; gap: 16px; }
.vhost-card {
    padding: 20px; border-radius: var(--radius);
    background: var(--surface); border: 1px solid var(--border);
}
.vhost-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.vhost-name { font-weight: 700; font-size: 1.05rem; color: var(--fg); }
.vhost-days { font-weight: 700; font-size: 0.92rem; }
.vhost-days.normal { color: var(--success); }
.vhost-days.warning { color: var(--warning); }
.vhost-days.danger { color: var(--danger); }
.vhost-info { margin-bottom: 12px; color: var(--muted); font-size: 0.9rem; }
.vhost-actions { display: flex; gap: 10px; }

.copyable {
    cursor: pointer; font-family: monospace; padding: 2px 8px; border-radius: 4px;
    background: var(--primary-light); color: var(--primary-hover);
    transition: background var(--transition);
}
.copyable:hover {
    background: var(--primary);
    color: #fff;
}
.copyable.copied {
    background: var(--success);
    color: #fff;
}

.badge { display: inline-block; padding: 2px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; }
.badge-green { background: var(--accent-light); color: #065f46; }
.badge-red { background: #fee2e2; color: #b91c1c; }
.badge-blue { background: var(--primary-light); color: #0369a1; }
.text-muted { color: var(--muted); }

/* ===== Modal ===== */
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.4); z-index: 9999; align-items: center; justify-content: center; backdrop-filter: blur(2px); }
.modal.hidden { display: none !important; }
.modal-content {
    background: var(--surface); border-radius: var(--radius-xl); max-width: 500px; width: 90%;
    max-height: 80vh; overflow: auto;
    border: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--border); }
.modal-header h3 { margin: 0; font-size: 1.15rem; font-weight: 700; color: var(--fg); }
.modal-close { font-size: 1.5rem; color: var(--muted); cursor: pointer; line-height: 1; transition: color 0.2s; }
.modal-close:hover { color: var(--danger); }
.modal-body { padding: 24px; line-height: 1.8; color: var(--fg); font-size: 0.95rem; }
.modal-footer { padding: 16px 24px; text-align: center; border-top: 1px solid var(--border); color: var(--muted); }

/* ===== Pay Type Selector ===== */
.pay-type-label {
    display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; margin-right: 10px;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    cursor: pointer; transition: all 0.2s; font-size: 0.92rem; color: var(--fg);
}
.pay-type-label:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}
.pay-type-label input[type="radio"] { accent-color: var(--primary); width: 16px; height: 16px; cursor: pointer; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .panel-grid { grid-template-columns: 1fr; }
    .panel-sidebar { position: static; }
    .panel-nav { flex-direction: row; flex-wrap: wrap; }
    .hero-title { font-size: 2.2rem; }
    .hero { min-height: 50vh; padding: 40px 16px; }
    .feature-grid { grid-template-columns: 1fr 1fr; }
    .steps { grid-template-columns: 1fr 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .points-packages { grid-template-columns: 1fr 1fr; }
    .nav a { padding: 6px 12px; font-size: 0.85rem; }
    .main { padding: 24px 16px; }
    .auth-card { padding: 28px; }
}
@media (max-width: 480px) {
    .feature-grid { grid-template-columns: 1fr; }
    .steps { grid-template-columns: 1fr; }
    .points-packages { grid-template-columns: 1fr; }
    .hero-title { font-size: 1.8rem; }
    .hero-desc { font-size: 1rem; }
    .auth-card { padding: 24px; }
    .captcha-row { flex-direction: column; }
    .captcha-img { width: 100%; height: auto; }
}