/* 公共样式变量和基础设置 */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2235;
    --bg-card-hover: #243049;
    --accent-cyan: #06b6d4;
    --accent-cyan-glow: rgba(6, 182, 212, 0.4);
    --accent-purple: #a855f7;
    --accent-purple-glow: rgba(168, 85, 247, 0.4);
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-pink: #ec4899;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #2d3a52;
    --radius: 12px;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 按钮 */
.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}
.btn-primary {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}
.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: 0 0 20px var(--accent-cyan-glow);
}
.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-danger { background: var(--accent-red); color: white; }
.btn-small { padding: 8px 16px; font-size: 13px; }

/* 输入框 */
.input-group { margin-bottom: 20px; }
.input-group input {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: border-color 0.3s;
}
.input-group input:focus { border-color: var(--accent-cyan); }

/* 图标按钮 */
.icon-btn {
    width: 28px; height: 28px;
    border: none;
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all 0.2s;
}
.icon-btn:hover { background: var(--border-color); color: var(--text-primary); }
.icon-btn.delete:hover { background: var(--accent-red); color: white; }

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 24px; right: 24px;
    background: var(--accent-green);
    color: white;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 14px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s;
    z-index: 1001;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.error { background: var(--accent-red); }

/* 模态框 */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-overlay.show { display: flex; }
.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    width: 100%;
    max-width: 500px;
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.modal-title { font-size: 18px; font-weight: 600; }
.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}
.form-group input:focus { border-color: var(--accent-cyan); }
.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state-icon { font-size: 48px; margin-bottom: 16px; }

/* 加载状态 */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    gap: 20px;
    color: var(--text-secondary);
}
.loading-spinner {
    width: 50px; height: 50px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }