/* ====== CSS 变量（全局设计令牌）====== */
:root {
    --bg:          #00051e;
    --bg-card:     rgba(0, 242, 255, 0.03);
    --bg-input:    rgba(0, 0, 0, 0.35);
    --accent:      #00f2ff;
    --accent-dim:  rgba(0, 242, 255, 0.12);
    --green:       #00ff88;
    --red:         #ff4757;
    --orange:      #ffa502;
    --purple:      #a855f7;
    --text:        #e2e8f0;
    --muted:       #64748b;
    --border:      rgba(0, 242, 255, 0.12);
    --radius:      10px;
    --shadow:      0 4px 24px rgba(0, 0, 0, 0.3);
    --font:        'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ====== 基础重置 ====== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    background: var(--bg); color: var(--text); font-family: var(--font);
    min-height: 100vh; line-height: 1.6; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: #fff; }

/* ====== 顶栏导航 ====== */
.top-nav {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 32px; height: 60px; border-bottom: 1px solid var(--border);
    background: rgba(0, 5, 30, 0.85); backdrop-filter: blur(12px);
    position: sticky; top: 0; z-index: 50;
}
.nav-logo {
    font-size: 1.2rem; font-weight: 900; color: var(--accent);
    letter-spacing: 4px; text-decoration: none;
}
.nav-links { display: flex; gap: 4px; }
.nav-links a {
    padding: 8px 16px; border-radius: 6px; font-size: 0.88rem;
    color: var(--muted); transition: 0.25s; font-weight: 500;
}
.nav-links a:hover { color: var(--text); background: var(--accent-dim); }
.nav-links a.active {
    color: var(--accent); background: var(--accent-dim);
}
.nav-right { display: flex; align-items: center; gap: 12px; font-size: 0.85rem; }
.nav-user { color: var(--muted); }
.nav-user .name { color: var(--accent); font-weight: 600; }
.nav-btn {
    padding: 6px 14px; border: 1px solid var(--border); border-radius: 6px;
    background: none; color: var(--muted); font-size: 0.8rem; cursor: pointer;
    transition: 0.25s;
}
.nav-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ====== 页面容器 ====== */
.page-container { max-width: 1360px; margin: 0 auto; padding: 28px 32px; }

/* ====== 卡片面板 ====== */
.card-panel {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px; position: relative;
}
.card-panel::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.card-title {
    font-size: 1rem; font-weight: 700; color: var(--accent);
    margin-bottom: 18px; display: flex; align-items: center; gap: 8px;
}

/* ====== 统计小卡片 ====== */
.stat-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px 24px;
    position: relative; overflow: hidden;
}
.stat-card .stat-label { font-size: 0.8rem; color: var(--muted); margin-bottom: 6px; }
.stat-card .stat-value { font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-card .stat-sub { font-size: 0.75rem; color: var(--muted); margin-top: 4px; }
.stat-card .stat-icon {
    position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
    font-size: 2.2rem; opacity: 0.1;
}

/* ====== 按钮 ====== */
.btn-primary {
    padding: 12px 28px; border: 2px solid var(--accent); background: transparent;
    color: var(--accent); font-weight: 700; border-radius: 8px;
    cursor: pointer; transition: 0.3s; font-size: 0.95rem;
}
.btn-primary:hover {
    background: var(--accent); color: var(--bg);
    box-shadow: 0 0 24px rgba(0, 242, 255, 0.3);
}
.btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-primary:disabled:hover { background: transparent; color: var(--accent); box-shadow: none; }

.btn-sm {
    padding: 6px 16px; font-size: 0.82rem; border-width: 1px;
}

.btn-danger {
    padding: 10px 24px; border: 2px solid var(--red); background: transparent;
    color: var(--red); font-weight: 700; border-radius: 8px;
    cursor: pointer; transition: 0.3s;
}
.btn-danger:hover { background: var(--red); color: #fff; }

/* ====== 表单控件 ====== */
.form-label { color: var(--muted); font-size: 0.82rem; margin-bottom: 5px; display: block; }
.form-input, .form-select {
    width: 100%; background: var(--bg-input); border: 1px solid var(--border);
    color: var(--text); border-radius: 8px; padding: 10px 14px; font-size: 0.92rem;
    transition: 0.25s; outline: none;
}
.form-input:focus, .form-select:focus {
    border-color: var(--accent); box-shadow: 0 0 0 2px rgba(0,242,255,0.1);
}
.form-input::placeholder { color: var(--muted); }
.form-select option { background: #0a0f2e; }

/* ====== Toast 通知 ====== */
.toast-container {
    position: fixed; top: 72px; right: 24px; z-index: 999;
    display: flex; flex-direction: column; gap: 8px;
}
.toast-item {
    padding: 12px 20px; border-radius: 8px; font-size: 0.88rem;
    color: #fff; min-width: 240px; box-shadow: var(--shadow);
    animation: toastIn 0.3s ease; display: flex; align-items: center; gap: 8px;
}
.toast-item.success { background: rgba(0,255,136,0.15); border: 1px solid rgba(0,255,136,0.3); color: var(--green); }
.toast-item.error   { background: rgba(255,71,87,0.15);  border: 1px solid rgba(255,71,87,0.3);  color: var(--red); }
.toast-item.info    { background: rgba(0,242,255,0.15);  border: 1px solid rgba(0,242,255,0.3);  color: var(--accent); }
.toast-item.warn    { background: rgba(255,165,2,0.15);  border: 1px solid rgba(255,165,2,0.3);  color: var(--orange); }
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
.toast-item.out { animation: toastOut 0.3s ease forwards; }
@keyframes toastOut { to { opacity: 0; transform: translateX(40px); } }

/* ====== 加载动画 ====== */
.spinner {
    width: 48px; height: 48px; border: 3px solid var(--border);
    border-top-color: var(--accent); border-radius: 50%;
    animation: spin 0.8s linear infinite; margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-box { text-align: center; padding: 48px 20px; color: var(--muted); }

/* ====== 弹窗 ====== */
.modal-mask {
    display: none; position: fixed; inset: 0; background: rgba(0,5,30,0.8);
    z-index: 100; align-items: center; justify-content: center;
}
.modal-mask.show { display: flex; }
.modal-body {
    background: #0a0f2e; border: 1px solid var(--border); border-radius: 14px;
    padding: 32px; max-width: 600px; width: 92%; max-height: 82vh; overflow-y: auto;
}
.modal-body h2 { color: var(--accent); margin-bottom: 16px; font-size: 1.3rem; }
.modal-close {
    float: right; background: none; border: none; color: var(--muted);
    font-size: 1.4rem; cursor: pointer; line-height: 1;
}
.modal-close:hover { color: var(--accent); }

/* ====== 进度条 ====== */
.progress-bar {
    height: 8px; background: rgba(255,255,255,0.06); border-radius: 4px; overflow: hidden;
}
.progress-bar .fill {
    height: 100%; border-radius: 4px; transition: width 0.8s ease;
    background: linear-gradient(90deg, var(--accent), var(--green));
}

/* ====== 标签 ====== */
.tag {
    display: inline-block; padding: 3px 12px; border-radius: 12px;
    font-size: 0.72rem; font-weight: 600;
}
.tag-cyan   { background: rgba(0,242,255,0.1); color: var(--accent); }
.tag-green  { background: rgba(0,255,136,0.1); color: var(--green); }
.tag-red    { background: rgba(255,71,87,0.1);  color: var(--red); }
.tag-orange { background: rgba(255,165,2,0.1);  color: var(--orange); }
.tag-purple { background: rgba(168,85,247,0.1); color: var(--purple); }

/* ====== 表格 ====== */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.data-table th { color: var(--muted); font-weight: 600; text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.data-table td { padding: 10px 12px; border-bottom: 1px solid rgba(255,255,255,0.03); }
.data-table tr:hover td { background: rgba(0,242,255,0.02); }

/* ====== 网格系统 ====== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }

/* ====== 响应式 ====== */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .top-nav { padding: 0 16px; }
    .nav-links { display: none; }
    .page-container { padding: 16px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .grid-auto { grid-template-columns: 1fr; }
}

/* ====== 移动端汉堡菜单 ====== */
.nav-mobile-toggle {
    display: none; background: none; border: none; color: var(--accent);
    font-size: 1.4rem; cursor: pointer;
}
@media (max-width: 768px) {
    .nav-mobile-toggle { display: block; }
    .nav-links.open {
        display: flex; flex-direction: column; position: absolute;
        top: 60px; left: 0; right: 0; background: rgba(0,5,30,0.95);
        padding: 12px; border-bottom: 1px solid var(--border);
        backdrop-filter: blur(12px);
    }
}

/* ====== 工具类 ====== */
.mt-1 { margin-top: 8px; }  .mt-2 { margin-top: 16px; }  .mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; } .mb-3 { margin-bottom: 24px; }
.gap-2 { gap: 16px; } .gap-3 { gap: 24px; }
.text-accent { color: var(--accent); }
.text-muted { color: var(--muted); }
.text-green { color: var(--green); }
.text-red   { color: var(--red); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.fw-bold { font-weight: 700; }
.fs-sm { font-size: 0.82rem; }
.fs-xs { font-size: 0.72rem; }
.d-flex { display: flex; } .items-center { align-items: center; } .justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }