/* 全局基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --error: #dc2626;
    --bg: #f0f4f8;
    --card: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* 页面容器 */
.page-container {
    max-width: 480px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.page-container.wide {
    max-width: 98%;
    justify-content: flex-start;
    padding-top: 30px;
}

/* 卡片 */
.card {
    background: var(--card);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 36px 32px;
}

.card-header {
    text-align: center;
    margin-bottom: 28px;
}

.card-header .icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.card-header h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.card-header p {
    color: var(--text-light);
    font-size: 14px;
}

/* 表单 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    font-family: inherit;
    text-align: center;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    width: 100%;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--border);
    color: var(--text);
}

.btn-danger {
    background: #fee2e2;
    color: var(--error);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

/* 提示消息 */
.flash-messages {
    margin-bottom: 20px;
}

.flash {
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    margin-bottom: 8px;
}

.flash-success {
    background: #dcfce7;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.flash-error {
    background: #fee2e2;
    color: var(--error);
    border: 1px solid #fecaca;
}

.flash-warning {
    background: #fef3c7;
    color: var(--warning);
    border: 1px solid #fde68a;
}

/* 状态标签 */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: #dcfce7;
    color: var(--success);
}

.badge-error {
    background: #fee2e2;
    color: var(--error);
}

.badge-warning {
    background: #fef3c7;
    color: var(--warning);
}

/* 链接信息条 */
.info-bar {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 10px;
    padding: 14px 16px;
    margin-bottom: 20px;
    font-size: 14px;
}

.info-bar.expired {
    background: #fef2f2;
    border-color: #fecaca;
    color: var(--error);
}

.info-bar strong {
    display: block;
    margin-bottom: 4px;
}

/* 占位展示页 */
.showcase-placeholder {
    text-align: center;
    padding: 60px 20px;
}

.showcase-placeholder .icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.showcase-placeholder h2 {
    font-size: 22px;
    margin-bottom: 12px;
}

.showcase-placeholder p {
    color: var(--text-light);
    margin-bottom: 24px;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 0 4px;
}

.top-bar .welcome {
    font-size: 14px;
    color: var(--text-light);
}

.top-bar .welcome strong {
    color: var(--text);
}

/* 响应式 */
@media (max-width: 600px) {
    .card {
        padding: 28px 20px;
    }

    .page-container {
        padding: 20px 16px;
    }
}