/* ========== 全局重置 & 基础变量 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 浅色主题（默认） */
    --bg-body: #f4f6fa;
    --bg-surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.02);
    --card-hover-shadow: 0 20px 30px -12px rgba(0, 0, 0, 0.15);
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --header-bg: #ffffffcc;
    --footer-bg: #f1f5f9;
    --search-bg: #ffffff;
    --placeholder-color: #94a3b8;
    --icon-bg: #eff6ff;
}

body.dark {
    --bg-body: #0f172a;
    --bg-surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
    --card-hover-shadow: 0 20px 30px -12px rgba(0, 0, 0, 0.5);
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --header-bg: #1e293bcc;
    --footer-bg: #0f172a;
    --search-bg: #334155;
    --placeholder-color: #94a3b8;
    --icon-bg: #334155;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.2s ease;
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem 2rem;
}

/* ========== 头部 ========== */
.portal-header {
    background: var(--header-bg);
    backdrop-filter: blur(8px);
    border-radius: 2rem;
    padding: 1.2rem 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}

.header-content {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent);
    background: var(--icon-bg);
    padding: 0.5rem;
    border-radius: 1.2rem;
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-left: 0.5rem;
}

.theme-toggle {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 3rem;
    width: 2.6rem;
    height: 2.6rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: all 0.2s;
    box-shadow: var(--card-shadow);
}

.theme-toggle:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* ========== 搜索区域 ========== */
.search-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.search-wrapper {
    flex: 2;
    min-width: 240px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1rem;
    pointer-events: none;
}

#searchInput {
    width: 100%;
    padding: 0.9rem 2.8rem 0.9rem 2.8rem;
    background: var(--search-bg);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.2s;
    outline: none;
    font-family: inherit;
}

#searchInput:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
}

.clear-btn {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.clear-btn:hover {
    opacity: 1;
    color: var(--accent);
}

.stats-badge {
    background: var(--bg-surface);
    padding: 0.5rem 1.2rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ========== 卡片网格 ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.8rem;
    margin: 1rem 0 2rem;
}

/* 卡片样式 */
.app-card {
    background: var(--bg-surface);
    border-radius: 1.5rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    cursor: pointer;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(2px);
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--accent);
}

.card-inner {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.card-icon {
    font-size: 2.5rem;
    color: var(--accent);
    background: var(--icon-bg);
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 1.2rem;
    margin-bottom: 0.25rem;
}

.app-name {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.app-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    font-size: 0.7rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 0.8rem;
}

.url-preview {
    font-family: monospace;
    font-size: 0.7rem;
    max-width: 180px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.launch-hint i {
    margin-left: 0.3rem;
    font-size: 0.7rem;
    transition: transform 0.1s;
}

.app-card:hover .launch-hint i {
    transform: translateX(3px);
}

/* 空状态 & 加载动画 */
.loading-placeholder, .empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    background: var(--bg-surface);
    border-radius: 2rem;
    border: 1px dashed var(--border-color);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

/* ========== 底部区域（含备案信息） ========== */
.portal-footer {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--footer-bg);
    border-radius: 1rem;
    padding: 1rem 1.5rem;
}

.portal-footer code {
    background: var(--bg-body);
    padding: 0.2rem 0.4rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
}

.footer-note {
    margin-top: 0.4rem;
    font-size: 0.7rem;
}

/* 新增备案信息样式 */
.footer-main {
    margin-bottom: 0.75rem;
}

.footer-beian {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    font-size: 0.75rem;
    border-top: 1px solid var(--border-color);
    padding-top: 0.8rem;
    margin-top: 0.3rem;
}

.footer-beian a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.footer-beian a:hover {
    color: var(--accent);
    text-decoration: underline;
}

.beian-sep {
    color: var(--border-color);
    user-select: none;
}

/* 响应式 */
@media (max-width: 700px) {
    .app-container {
        padding: 1rem;
    }
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    .theme-toggle {
        align-self: flex-end;
    }
    .card-grid {
        gap: 1rem;
    }
    .card-inner {
        padding: 1.2rem;
    }
    .stats-badge {
        font-size: 0.75rem;
    }
}

@media (max-width: 550px) {
    .footer-beian {
        flex-direction: column;
        gap: 0.3rem;
    }
    .beian-sep {
        display: none;
    }
}