/* ===========================
   基础样式
   =========================== */
:root {
    --primary-color: #ff4081;
    --primary-light: #ff79b0;
    --primary-dark: #c60055;
    --bg-color: #f8f8f8;
    --card-bg: #ffffff;
    --text-primary: #222222;
    --text-secondary: #555555;
    --text-muted: #999999;
    --border-color: #f0f0f0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --header-height: 50px;
    --tabs-height: 42px;
    --bottom-nav-height: 50px;
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   头部导航
   =========================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: linear-gradient(90deg, #e8758f 0%, #d88da3 25%, #c09ab8 50%, #9ca8cc 75%, #7eb5d9 100%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    z-index: 1000;
}

/* 让状态栏也有渐变色 - 通过伪元素延伸 */
.header::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 0;
    right: 0;
    height: 50px;
    background: linear-gradient(90deg, #e8758f 0%, #d88da3 25%, #c09ab8 50%, #9ca8cc 75%, #7eb5d9 100%);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 4px;
}

.header-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: contain;
}

.menu-btn,
.icon-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
}

.icon-btn {
    min-width: 44px;
}

.icon-btn .badge {
    background: rgba(255,255,255,0.25);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
}

.icon-btn small {
    font-size: 9px;
    opacity: 0.9;
    margin-top: 2px;
}

.header-center {
    flex: 1;
    padding: 0 8px;
}

.search-bar {
    background: rgba(255,255,255,0.25);
    border-radius: 18px;
    padding: 7px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    font-size: 14px;
}

.search-bar svg {
    opacity: 0.9;
    flex-shrink: 0;
}

.search-bar span {
    opacity: 0.95;
}

/* ===========================
   标签导航
   =========================== */
.tabs {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    height: var(--tabs-height);
    background: #fafafa;
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 20px;
    border-bottom: none;
    z-index: 999;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    scroll-behavior: smooth;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    white-space: nowrap;
    padding: 8px 0;
    position: relative;
    transition: color 0.2s;
    font-weight: 400;
    flex-shrink: 0;
}

.tab.active {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 16px;
}

.tab.active::after {
    display: none;
}

/* 3D Splat 按钮样式 - 和其他tab保持一致 */
.tab-splat {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    white-space: nowrap;
    padding: 8px 0;
    position: relative;
    transition: color 0.2s;
    font-weight: 400;
    flex-shrink: 0;
}

.tab-splat:hover {
    color: var(--text-primary);
}

.tab-more {
    background: none;
    border: none;
    padding: 8px;
    margin-left: auto;
    color: var(--text-secondary);
    cursor: pointer;
    flex-shrink: 0;
}

/* ===========================
   新闻列表
   =========================== */
.news-feed {
    position: fixed;
    top: calc(var(--header-height) + var(--tabs-height));
    left: 0;
    right: 0;
    bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom));
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0;
    background: white;
    -webkit-overflow-scrolling: touch;
}

.news-card {
    background: var(--card-bg);
    margin-bottom: 0;
    overflow: hidden;
    box-shadow: none;
    display: flex;
    padding: 14px 16px;
    gap: 12px;
    cursor: pointer;
    transition: background-color 0.15s;
    text-decoration: none;
    color: inherit;
    border-bottom: 1px solid #f5f5f5;
}

.news-card:active {
    background-color: #f9f9f9;
    transform: none;
}

.news-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-width: 0;
    padding: 2px 0;
}

.news-card-title {
    font-size: 17px;
    font-weight: 500;
    line-height: 1.45;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0;
    letter-spacing: 0.2px;
}

.news-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: auto;
    padding-top: 10px;
}

.news-card-source {
    color: var(--text-muted);
    font-weight: 400;
}

.news-card-time {
    color: var(--text-muted);
}

.news-card-image-wrapper {
    position: relative;
    width: 115px;
    height: 76px;
    flex-shrink: 0;
    border-radius: 6px;
    overflow: hidden;
}

.news-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
    background: #f0f0f0;
}

/* Spatial 图片标记 */
.news-card-image-wrapper.spatial::after {
    content: '3D';
    position: absolute;
    bottom: 4px;
    right: 4px;
    background: rgba(0,0,0,0.5);
    color: white;
    font-size: 9px;
    font-weight: 600;
    padding: 2px 5px;
    border-radius: 3px;
}

/* ===========================
   底部导航
   =========================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(var(--bottom-nav-height) + var(--safe-area-bottom));
    padding-bottom: var(--safe-area-bottom);
    background: white;
    display: flex;
    justify-content: space-around;
    align-items: center;
    border-top: 1px solid #eee;
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    text-decoration: none;
    color: #999;
    font-size: 10px;
    padding: 6px 16px;
    transition: color 0.2s;
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item svg {
    width: 22px;
    height: 22px;
}

/* ===========================
   Spatial指示器
   =========================== */
.spatial-indicator {
    position: fixed;
    top: calc(var(--header-height) + var(--tabs-height) + 12px);
    right: 12px;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(10px);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 500;
    z-index: 100;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
}

.spatial-indicator.active {
    opacity: 1;
    transform: translateY(0);
}

.spatial-icon {
    width: 24px;
    height: 24px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===========================
   响应式设计
   =========================== */
@media (min-width: 768px) {
    .news-feed {
        max-width: 600px;
        margin: 0 auto;
        padding: 0;
    }
    
    .news-card {
        padding: 16px 20px;
    }
    
    .news-card-image-wrapper {
        width: 140px;
        height: 93px;
    }
    
    .news-card-title {
        font-size: 18px;
    }
}

/* ===========================
   加载动画
   =========================== */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.news-card.loading .news-card-title {
    height: 48px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

.news-card.loading .news-card-image {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}