:root {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --accent: #06b6d4;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --radius: 10px;
    --shadow: 0 2px 15px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.2s ease;
}

body {
    font-family: "Inter", "Microsoft YaHei", sans-serif;
    background: var(--bg-main);
    min-height: 100vh;
    padding: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dashboard {
    width: 100%;
    max-width: 700px;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px 25px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.title {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.tab-group {
    display: flex;
    gap: 10px;
    margin-bottom: 22px;
}

.tab {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 15px;
    cursor: pointer;
}

.tab.active {
    background: var(--accent);
    color: #fff;
}

.form-item {
    margin-bottom: 18px;
}

.form-item label {
    display: block;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 14px;
}

input, textarea {
    width: 100%;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    resize: vertical;
}

input:focus, textarea:focus {
    border-color: var(--accent);
}

.btn-group {
    display: flex;
    gap: 12px;
    margin: 20px 0;
}

.btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: var(--radius);
    font-size: 15px;
    cursor: pointer;
}

.btn.primary {
    background: var(--accent);
    color: #fff;
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
}

.tip {
    text-align: center;
    font-size: 13px;
    color: var(--accent);
    margin-top: 10px;
    min-height: 16px;
}

.copyright {
    text-align: center;
    margin-top: 30px;
    font-size: 12px;
    color: var(--text-secondary);
    opacity: 0.7;
}