/* 基础样式 */
:root {
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --background-color: #f4f7f6;
    --card-background: #ffffff;
    --text-color: #333;
    --light-text-color: #666;
    --border-color: #ddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --error-color: #dc3545;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

/* 头部 */
.main-header {
    background-color: var(--card-background);
    padding: 20px 40px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-header h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.header-actions a {
    text-decoration: none;
}

/* 按钮和输入框 */
.button {
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s;
}

.button:hover {
    transform: translateY(-1px);
}

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

.button.primary:hover {
    background-color: var(--primary-hover-color);
}

.button:not(.primary) {
    background-color: #e9ecef;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.button:not(.primary):hover {
    background-color: #dee2e6;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

/* 卡片和布局 */
.card {
    background-color: var(--card-background);
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-color);
    padding: 24px;
    margin-bottom: 24px;
}

.group-card {
    border: 1px solid var(--border-color);
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    border-bottom: 1px solid #eee;
    padding-bottom: 16px;
}

.group-header h3 {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 600;
}

.group-id {
    font-size: 1rem;
    background-color: #e9ecef;
    padding: 4px 8px;
    border-radius: 4px;
    margin-right: 8px;
}

.group-note-display {
    color: var(--light-text-color);
    font-size: 1rem;
    font-weight: normal;
}

.group-note-input {
    width: 200px;
    margin-left: 8px;
    display: inline-block;
}

.group-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.view-count {
    color: var(--primary-color);
    font-weight: 600;
}

.group-content p {
    margin-bottom: 12px;
}

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

.group-content a:hover {
    text-decoration: underline;
}

/* 链接列表 */
.links-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.link-item {
    display: flex;
    align-items: center;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    padding: 8px;
    gap: 8px;
    cursor: grab;
    transition: box-shadow 0.2s, transform 0.2s;
}

.link-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.link-item:active {
    cursor: grabbing;
}

.link-drag-handle {
    font-size: 1.2rem;
    color: #ccc;
    cursor: grab;
}

.link-input {
    flex-grow: 1;
    border: 1px solid #dee2e6;
    padding: 8px;
    font-size: 0.9rem;
}

.link-input:focus {
    border-color: var(--primary-color);
    box-shadow: none;
}

/* 登录页特定样式 */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    text-align: center;
}

.login-container h2 {
    margin-bottom: 24px;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.input-group {
    margin-bottom: 16px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.error-message {
    color: var(--error-color);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

/* 工具类 */
.hidden {
    display: none !important;
}