:root {
    --bg: #f5f1e8;
    --panel: #fffdf8;
    --ink: #1f2933;
    --muted: #67717d;
    --line: #dbcdb6;
    --accent: #0f766e;
    --accent-soft: #d9f3ed;
    --danger: #b42318;
    --shadow: 0 14px 40px rgba(31, 41, 51, 0.08);
    --radius: 18px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at top right, rgba(15, 118, 110, 0.10), transparent 28%),
        linear-gradient(180deg, #f8f5ee 0%, #f1ebdf 100%);
}

.shell { min-height: 100vh; display: flex; }
.sidebar {
    width: 250px;
    padding: 28px 20px;
    border-right: 1px solid rgba(219, 205, 182, 0.7);
    background: rgba(255, 253, 248, 0.75);
    backdrop-filter: blur(10px);
}
.brand { font-size: 28px; font-weight: 700; letter-spacing: 0.04em; }
.subline { margin-top: 8px; color: var(--muted); font-size: 14px; }
.nav { margin-top: 28px; display: grid; gap: 10px; }
.nav a {
    text-decoration: none;
    color: var(--ink);
    padding: 12px 14px;
    border-radius: 12px;
}
.nav a:hover { background: var(--accent-soft); color: var(--accent); }

.main { flex: 1; padding: 28px; }
.auth-main { display: flex; align-items: center; justify-content: center; }
.auth-card, .card {
    background: rgba(255, 253, 248, 0.95);
    border: 1px solid rgba(219, 205, 182, 0.8);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.auth-card {
    width: min(460px, 100%);
    padding: 32px;
}
.page-head h1, .auth-card h1, .card h2 { margin: 0 0 10px; }
.page-head p, .auth-card p { margin: 0; color: var(--muted); }
.tip-box {
    margin: 16px 0;
    padding: 12px 14px;
    background: #fff3cd;
    border-radius: 12px;
    color: #7a5d00;
}

.stats, .grid-two {
    margin-top: 22px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}
.stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stat { padding: 20px; }
.stat span { display: block; color: var(--muted); margin-bottom: 10px; }
.stat strong { font-size: 30px; }

.card { padding: 22px; margin-top: 22px; overflow: auto; }
.form-grid { display: grid; gap: 14px; }
.form-grid label { display: grid; gap: 8px; color: var(--muted); }
.inline-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.separated { padding: 12px 0; border-bottom: 1px dashed var(--line); }

input, textarea, button {
    font: inherit;
    border-radius: 12px;
}
input, textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--line);
    background: #fff;
}
button {
    border: 0;
    padding: 12px 16px;
    background: var(--accent);
    color: white;
    cursor: pointer;
}
button:hover { opacity: 0.92; }

table { width: 100%; border-collapse: collapse; }
th, td {
    text-align: left;
    padding: 12px 10px;
    border-bottom: 1px solid rgba(219, 205, 182, 0.65);
    vertical-align: top;
}
th { color: var(--muted); font-weight: 600; }

.flash-stack { display: grid; gap: 10px; margin-bottom: 18px; }
.flash {
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--accent-soft);
    color: var(--accent);
}
.flash.error { background: #fee4e2; color: var(--danger); }
.flash.success { background: var(--accent-soft); color: var(--accent); }

@media (max-width: 980px) {
    .shell { display: block; }
    .sidebar { width: 100%; border-right: 0; border-bottom: 1px solid rgba(219, 205, 182, 0.7); }
    .stats, .grid-two { grid-template-columns: 1fr; }
}