/* 论坛共享样式 - 黑白简约风 */

:root {
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --color-primary: #4a5568;
    --color-primary-hover: #3d4852;
    --color-bg: #f5f5f5;
    --color-card: #ffffff;
    --color-accent: #5b7fff;
    --color-accent-hover: #4a6ae0;
    --color-text: #2d3748;
    --color-text-secondary: #718096;
    --color-border: #e2e8f0;
    --color-success: #2ecc71;
    --color-danger: #e74c3c;
    --color-danger-hover: #c0392b;
    --radius-card: 16px;
    --radius-button: 8px;
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
}

body {
    min-height: 100vh;
    background: var(--color-bg);
    color: var(--color-text);
}

/* 导航栏 */
.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 60px;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-logo:hover {
    color: var(--color-primary-hover);
}

.nav-tabs {
    display: flex;
    gap: 8px;
}

.nav-tab {
    padding: 8px 20px;
    border: none;
    background: transparent;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-button);
    cursor: pointer;
    transition: all 0.15s;
}

.nav-tab:hover {
    background: #f0f0f0;
    color: var(--color-primary);
}

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

.nav-profile {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(74, 85, 104, 0.2);
    transition: transform 0.15s;
}

.nav-profile:hover {
    transform: scale(1.08);
}

.nav-profile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.nav-profile-icon {
    font-size: 18px;
    color: white;
}

/* 头像 */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--color-border);
    flex-shrink: 0;
}

.avatar--small {
    width: 32px;
    height: 32px;
}

.avatar--large {
    width: 64px;
    height: 64px;
}

.avatar--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    border-radius: 50%;
}

.avatar--placeholder.small {
    font-size: 12px;
}

/* 卡片 */
.card {
    background: var(--color-card);
    border-radius: var(--radius-card);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    padding: 20px;
}

/* 按钮 */
.btn-primary {
    padding: 10px 24px;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-button);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    padding: 10px 24px;
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-button);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-secondary:hover {
    background: #f5f5f5;
    color: var(--color-text);
}

.btn-danger {
    padding: 6px 14px;
    background: transparent;
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-danger:hover {
    background: var(--color-danger);
    color: #fff;
}

/* 模态框 */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--color-card);
    border-radius: var(--radius-card);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
    padding: 28px;
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    overflow-y: auto;
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.modal-input,
.modal-textarea {
    width: 100%;
    padding: 12px 14px;
    margin-bottom: 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-button);
    font-family: var(--font-primary);
    font-size: 15px;
    color: var(--color-text);
    outline: none;
    transition: border-color 0.15s;
}

.modal-input:focus,
.modal-textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(91, 127, 255, 0.1);
}

.modal-textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 8px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--color-text-secondary);
    font-size: 15px;
}

/* 加载更多 */
.load-more-wrap {
    text-align: center;
    padding: 16px 0 32px;
}

.load-more-btn {
    padding: 10px 32px;
    border: 1px solid var(--color-border);
    background: var(--color-card);
    border-radius: var(--radius-button);
    color: var(--color-text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.15s;
}

.load-more-btn:hover {
    background: #f5f5f5;
    color: var(--color-text);
}

/* 响应式 */
@media (max-width: 600px) {
    .nav-bar {
        padding: 0 16px;
    }

    .modal-content {
        padding: 20px;
        width: 95%;
    }
}