:root {
    --bg-color: #0d1117;
    --surface-color: #161b22;
    --border-color: #30363d;
    --hover-bg: #21262d;
    --overlay-bg: rgba(0, 0, 0, 0.8);

    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;

    --primary-color: #1f6feb;
    --primary-hover: #1a5cbf;
    --success-color: #238636;
    --success-hover: #2ea043;
    --danger-color: #da3633;
    --danger-hover: #b62324;
    --accent-orange: #d29922;

    --code-bg: #0d1117;
    --code-font: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    font-size: 14px;
    line-height: 1.5;
}

h2 { font-size: 24px; font-weight: 500; margin: 0 0 24px 0; border-bottom: 1px solid var(--border-color); padding-bottom: 16px; }
h3 { font-size: 16px; font-weight: 600; margin: 24px 0 16px 0; color: var(--text-primary); }
a { text-decoration: none; color: inherit; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-color); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

.top-bar {
    height: 60px;
    padding: 0 24px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    z-index: 10;
}
.brand { font-weight: 600; font-size: 16px; display: flex; align-items: center; gap: 8px; cursor: pointer; }

.main-container { display: flex; flex: 1; overflow: hidden; }

.sidebar {
    width: 240px;
    background: var(--bg-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding-top: 20px;
    flex-shrink: 0;
    overflow-y: auto;
}

.content { flex: 1; padding: 32px 40px; overflow-y: auto; position: relative; }

.nav-group-title {
    padding: 0 16px;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.sidebar-nav { margin-bottom: 24px; }
.sidebar-nav a {
    padding: 8px 16px;
    margin: 2px 12px;
    color: var(--text-secondary);
    border-radius: 6px;
    display: block;
    transition: all 0.2s;
    font-size: 14px;
    cursor: pointer;
}
.sidebar-nav a:hover { background: var(--hover-bg); color: var(--text-primary); }
.sidebar-nav a.active { background: rgba(31, 111, 235, 0.1); color: var(--primary-color); font-weight: 500; }

.btn {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.btn:hover { background: var(--hover-bg); border-color: var(--text-secondary); }

.btn-primary { background: var(--success-color); color: #fff; border: 1px solid rgba(240,246,252,0.1); }
.btn-primary:hover { background: var(--success-hover); border-color: transparent; }

.btn-danger { background: var(--danger-color); color: #fff; border: 1px solid rgba(240,246,252,0.1); }
.btn-danger:hover { background: var(--danger-hover); border-color: transparent; }

.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 24px;
    margin-bottom: 24px;
}

.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
    text-align: left; padding: 12px 16px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    font-weight: 500; font-size: 13px;
    background: var(--surface-color);
}
.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 13px;
}
.data-table tr:hover { background: var(--hover-bg); }

.tab-nav { display: flex; gap: 24px; border-bottom: 1px solid var(--border-color); margin-bottom: 24px; }
.tab-item { padding: 12px 0; cursor: pointer; color: var(--text-secondary); border-bottom: 2px solid transparent; font-size: 14px; transition: color 0.2s; }
.tab-item:hover { color: var(--text-primary); }
.tab-item.active { color: var(--text-primary); border-bottom-color: #f78166; font-weight: 500; }
.tab-sub-section { display: none; }
.tab-sub-section.active { display: block; animation: fadeEffect 0.3s; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 12px; border: 1px solid var(--border-color); color: var(--text-secondary); }

.code-container {
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    background: var(--code-bg);
    margin-bottom: 20px;
}
.code-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 8px 16px; background: var(--surface-color); border-bottom: 1px solid var(--border-color);
    font-size: 12px; color: var(--text-secondary);
}
pre { margin: 0; padding: 16px; overflow-x: auto; font-family: var(--code-font); font-size: 13px; line-height: 1.5; }

.range-picker { display: flex; background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 6px; padding: 2px; }
.range-btn { border: none; background: transparent; color: var(--text-secondary); padding: 4px 12px; font-size: 12px; cursor: pointer; border-radius: 4px; }
.range-btn.active { background: var(--surface-color); color: var(--text-primary); font-weight: 500; }

.hero-section { display: flex; gap: 40px; margin-bottom: 60px; align-items: center; }
.hero-content { flex: 1; min-width: 300px; }
.hero-title {
    font-size: 32px; font-weight: 600; line-height: 1.2; margin-bottom: 16px;
    background: linear-gradient(90deg, #fff, #a0a0a0); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 16px; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.6; }

.hero-code-window {
    flex: 1;
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    overflow: hidden;
    display: flex; flex-direction: column;
    height: 420px; min-width: 0; position: relative;
}
@media (max-width: 1024px) { .hero-code-window { display: none; } }

.window-header {
    background: var(--surface-color);
    padding: 10px 16px;
    display: flex; align-items: center; justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}
.header-controls { display: flex; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.copy-icon-btn {
    background: transparent; border: 1px solid var(--border-color); color: var(--text-secondary);
    border-radius: 4px; padding: 4px 8px; font-size: 12px; cursor: pointer; transition: all 0.2s;
    display: flex; align-items: center; gap: 6px;
}
.copy-icon-btn:hover { background: var(--hover-bg); color: var(--text-primary); border-color: var(--text-secondary); }

.code-scroll-container { flex: 1; overflow: auto; position: relative; }
.code-scroll-container pre { background: transparent; font-family: var(--code-font); }

.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 50px; }
.tech-card {
    background: var(--surface-color); border: 1px solid var(--border-color); border-radius: 8px;
    padding: 24px; position: relative; transition: all 0.2s ease; display: flex; flex-direction: column;
    height: 140px; justify-content: space-between; overflow: hidden;
}
.tech-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: var(--line-color, var(--primary-color)); opacity: 0.7; transition: opacity 0.2s;
}
.tech-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); border-color: var(--line-color); background: #1c2128; }
.tech-card:hover::before { opacity: 1; height: 3px; }
.tech-card h3 { font-size: 18px; margin: 0 0 8px 0; font-weight: 600; color: var(--text-primary); display: flex; align-items: center; gap: 8px; }
.tech-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; margin: 0; }

.accent-flash { --line-color: #ff7b72; }
.accent-mini  { --line-color: #d2a8ff; }
.accent-n1    { --line-color: #79c0ff; }

.action-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.action-item {
    display: flex; align-items: flex-start; gap: 16px; padding: 16px; background: transparent;
    border-radius: 8px; cursor: pointer; transition: background 0.2s; border: 1px solid transparent;
}
.action-item:hover { background: var(--surface-color); }
.action-icon-box {
    width: 40px; height: 40px; background: rgba(110, 118, 129, 0.1); border-radius: 6px;
    display: flex; align-items: center; justify-content: center; color: var(--text-primary); flex-shrink: 0;
}
.action-content { flex: 1; }
.action-title { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.action-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.4; }

@media (max-width: 768px) { .action-grid, .model-grid { grid-template-columns: 1fr; } }

.balance-dashboard {
    display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 1px;
    background: var(--border-color); border: 1px solid var(--border-color);
    border-radius: 8px; overflow: hidden; margin-bottom: 24px;
}
.balance-item {
    background: var(--surface-color); padding: 24px;
    display: flex; flex-direction: column; justify-content: center;
}
.balance-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.balance-value { font-size: 28px; font-weight: 500; letter-spacing: -0.5px; }

.stat-card-row { display: flex; gap: 16px; margin-bottom: 16px; }
.stat-card {
    flex: 1; background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px; padding: 16px;
}

.modal-overlay {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--overlay-bg); backdrop-filter: blur(4px); z-index: 2000;
    justify-content: center; align-items: center;
}
.modal-box {
    background: var(--surface-color); border: 1px solid var(--border-color); border-radius: 12px;
    width: 450px; padding: 0; box-shadow: 0 12px 24px rgba(0,0,0,0.5);
    animation: slideUp 0.3s ease-out;
}
.modal-header { padding: 16px 24px; border-bottom: 1px solid var(--border-color); font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: 24px; }
.modal-footer { padding: 16px 24px; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 12px; background: var(--bg-color); border-radius: 0 0 12px 12px; }

.page-section { display: none; }
.page-section.active { display: block; animation: fadeEffect 0.2s; }

@keyframes fadeEffect { from { opacity: 0.8; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.promo-box {
    background: rgba(31, 111, 235, 0.05);
    border: 1px solid rgba(31, 111, 235, 0.2);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 20px;
}
.promo-title {
    font-size: 13px; font-weight: 600; color: var(--primary-color); margin-bottom: 8px;
}
.promo-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
}
.promo-item {
    font-size: 12px; color: var(--text-secondary);
    background: var(--surface-color); border: 1px solid var(--border-color);
    padding: 4px 8px; border-radius: 4px;
    display: flex; justify-content: space-between; align-items: center;
}
.promo-item span {
    color: var(--accent-orange); font-weight: 600;
}
.promo-item.highlight {
    border-color: rgba(210, 153, 34, 0.5);
    background: rgba(210, 153, 34, 0.05);
}
.arrival-preview {
    background: var(--bg-color);
    border-radius: 6px;
    padding: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}