/* 江山之城 · 统一设计系统 */
:root {
    --bg: #0a0a0c;
    --bg-card: #141418;
    --bg-elevated: #1c1c22;
    --border: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(220, 38, 38, 0.45);
    --text: #e8e8ec;
    --text-muted: #888894;
    --accent: #dc2626;
    --accent-hover: #ef4444;
    --accent-soft: rgba(220, 38, 38, 0.12);
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --font: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    --max: 1200px;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

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

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s;
}
.btn:hover { background: #252530; text-decoration: none; }
.btn-primary {
    background: linear-gradient(180deg, var(--accent-hover), var(--accent));
    border-color: rgba(255, 255, 255, 0.15);
    color: #fff;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-danger { background: #7f1d1d; border-color: #991b1b; }

/* 表单 */
input, textarea, select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; min-height: 80px; }
label { display: block; font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }

/* 提示 */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; }
.alert-error { background: rgba(127, 29, 29, 0.35); border: 1px solid #991b1b; color: #fca5a5; }
.alert-success { background: rgba(21, 128, 61, 0.25); border: 1px solid #166534; color: #86efac; }

/* 后台顶栏 */
.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: rgba(10, 10, 12, 0.95);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-header .logo { font-weight: 700; color: var(--accent-hover); font-size: 17px; text-decoration: none; }
.site-header nav { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.site-header nav a { color: var(--text-muted); font-size: 14px; text-decoration: none; }
.site-header nav a:hover { color: var(--text); }

.container { max-width: var(--max); margin: 0 auto; padding: 24px 16px 48px; }

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}
.card-title { font-size: 15px; font-weight: 600; color: var(--accent-hover); margin-bottom: 16px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.form-group { margin-bottom: 16px; }