:root {
    /* 升级后的 Light 模式 - 灵动渐变方案 (左下深 -> 右上浅) */
    --bg-page: #dbeafe; 
    --bg-gradient: linear-gradient(to top right, #dbeafe 0%, #f8fafc 100%);
    --bg-card: #ffffff;
    --bg-table-header: rgba(248, 250, 252, 0.8);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --success-bg: #f0fdf4;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --card-border: 1px solid rgba(255, 255, 255, 0.8);
    --theme-accent: var(--primary);
    --theme-accent-hover: var(--primary-hover);
    --theme-accent-bg: rgba(59, 130, 246, 0.1);
}

[data-theme="dark"] {
    /* 保持原有的暗色模式逻辑 */
    --bg-page: #0f172a;
    --bg-gradient: none; /* 暗色模式通常使用纯色以保护视力 */
    --bg-card: #1e293b;
    --bg-table-header: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --primary: #3b82f6;
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.1);
    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.1);
    --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --card-border: 1px solid #334155;
    --theme-accent: var(--success);
    --theme-accent-hover: #6ee7b7;
    --theme-accent-bg: rgba(52, 211, 153, 0.1);
}

* { box-sizing: border-box; }

body {
    margin: 0; 
    background-color: var(--bg-page);
    background-image: var(--bg-gradient);
    background-attachment: fixed; /* 确保滚动时背景不动 */
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif; 
    transition: background 0.3s, color 0.3s;
    min-height: 100vh;
}

.card { 
    background: var(--bg-card); border-radius: 12px; border: var(--card-border); 
    box-shadow: var(--shadow); padding: 1.5rem; transition: background 0.3s, border-color 0.3s;
}

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    text-align: center; gap: 0.5rem; padding: 0.65rem 1.5rem;
    border-radius: 10px; font-weight: 600; cursor: pointer;
    transition: all 0.2s; border: none; white-space: nowrap;
    text-decoration: none !important;
}
.btn-primary { background: var(--theme-accent); color: white; }
.btn-primary:hover { background: var(--theme-accent-hover); transform: translateY(-1px); }

.btn-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border-color); }
.btn-ghost:hover { background: var(--border-color); color: var(--text-main); }

input, select, textarea { 
    background: var(--bg-card); color: var(--text-main); border: 1px solid var(--border-color);
    padding: 0.65rem 1rem; border-radius: 10px; outline: none; transition: 0.2s; width: 100%;
}
input:focus { border-color: var(--theme-accent); box-shadow: 0 0 0 3px var(--theme-accent-bg); }

.alert {
    display: flex; align-items: flex-start; gap: 0.85rem; padding: 1rem 1.25rem;
    border-radius: 12px; margin-bottom: 1.5rem; font-size: 0.9rem; line-height: 1.5;
    border: 1px solid transparent; box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    position: relative; transition: opacity 0.3s, transform 0.3s;
    text-align: left;
}
.alert-content {
    flex: 1; display: flex; align-items: center; gap: 0.75rem; text-align: left;
}
.alert-close {
    background: none; border: none; cursor: pointer; color: currentColor; opacity: 0.5;
    padding: 2px; display: flex; align-items: center; justify-content: center; transition: 0.2s;
    margin-left: auto; align-self: center;
}
.alert-close:hover { opacity: 1; transform: scale(1.1); }
.alert-success { background-color: #f0fdf4; color: #166534; border-color: #dcfce7; border-left: 4px solid #22c55e; }
[data-theme="dark"] .alert-success { background-color: var(--success-bg); border-color: rgba(52, 211, 153, 0.2); color: var(--success); }

.alert-error { background-color: #fef2f2; color: #991b1b; border-color: #fee2e2; border-left: 4px solid #ef4444; }
[data-theme="dark"] .alert-error { background-color: var(--danger-bg); border-color: rgba(248, 113, 113, 0.2); color: var(--danger); }

/* 表格样式 */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th { 
    font-size: 0.85rem; font-weight: 800; letter-spacing: 0.02em;
    background: var(--bg-table-header); padding: 1rem; text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.data-table td { padding: 1rem; border-bottom: 1px solid var(--border-color); }
.time-text { font-size: 1rem; font-weight: 600; font-family: monospace; }

/* 会员等级视觉 */
.nav-user {
    display: flex; align-items: center; gap: 0.75rem; padding: 0.5rem 1.25rem;
    border-radius: 12px; border: var(--card-border); font-weight: 700; transition: 0.3s;
    text-decoration: none !important;
    color: var(--text-main);
    background: var(--bg-card);
}
.nav-user:hover { border-color: var(--theme-accent); background: var(--bg-page); }        
.nav-user.plan-plus { background: linear-gradient(135deg, #fef3c7 0%, #fcd34d 100%); border-color: #fbbf24; color: #92400e; }
[data-theme="dark"] .nav-user.plan-plus { background: linear-gradient(135deg, #b45309 0%, #78350f 100%); color: #fef3c7; }
.nav-user.plan-pro { background: linear-gradient(135deg, #f3e8ff 0%, #d8b4fe 100%); border-color: #c084fc; color: #6b21a8; }
[data-theme="dark"] .nav-user.plan-pro { background: linear-gradient(135deg, #6b21a8 0%, #4c1d95 100%); color: #f3e8ff; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.4s ease-out; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.spin { animation: spin 1s linear infinite; }

/* 密码切换组件 */
.password-wrapper { position: relative; width: 100%; }
.password-toggle {
    position: absolute; right: 1rem; top: 50%; transform: translateY(-50%);
    background: none; border: none; cursor: pointer; color: var(--text-muted);
    padding: 0; display: flex; align-items: center; transition: 0.2s; z-index: 10;
}
.password-toggle:hover { color: var(--theme-accent); }

/* 自定义对话框样式 */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px); display: flex; align-items: center;
    justify-content: center; z-index: 20000; visibility: hidden; opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.modal-overlay.active { visibility: visible; opacity: 1; }
.modal-container {
    background: var(--bg-card); color: var(--text-main);
    width: 90%; max-width: 380px; padding: 2rem; border-radius: 20px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); border: var(--card-border);
    transform: translateY(20px) scale(0.95); transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
}
.modal-overlay.active .modal-container { transform: translateY(0) scale(1); }
.modal-icon {
    width: 4rem; height: 4rem; margin: 0 auto 1.5rem;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%; background: var(--theme-accent-bg); color: var(--theme-accent);
}
.modal-icon i { width: 2rem; height: 2rem; }
.modal-title { font-size: 1.25rem; font-weight: 800; margin-bottom: 0.75rem; color: var(--text-main); }
.modal-message { color: var(--text-muted); line-height: 1.6; margin-bottom: 2rem; font-weight: 500; }
.modal-btn { 
    width: 100%; padding: 0.875rem; border-radius: 12px; font-weight: 700;
    background: var(--theme-accent); color: white; border: none; cursor: pointer;
    transition: all 0.2s; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}
.modal-btn:hover { background: var(--theme-accent-hover); transform: translateY(-2px); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); }
.modal-btn:active { transform: translateY(0); }

/* --- Toggle Switch --- */
.switch-container {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-card);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    border: var(--card-border);
    cursor: pointer;
    transition: 0.2s;
    user-select: none;
}
.switch-container:hover { border-color: var(--theme-accent); }

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

input:checked + .slider {
    background-color: var(--success);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

.switch-label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-main);
}