/* ========== 全局变量与重置 ========== */
:root {
    --tech-gradient: linear-gradient(135deg, #0052d4 0%, #4364f7 50%, #6fb1fc 100%);
    --tech-color-mid: #4364f7;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --border-light: rgba(0,0,0,0.04);
    --radius-md: 14px;
    --card-radius: 16px;
    --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 35px rgba(67, 100, 247, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

body.modal-open { overflow: hidden; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; object-fit: cover; }
button { cursor: pointer; border: none; font-family: inherit; }

/* ========== 首页 Hero 区域 ========== */
.site-hero {
    background: var(--tech-gradient);
    padding: clamp(48px, 8vw, 80px) 24px clamp(60px, 10vw, 100px);
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.site-hero::before {
    content: ''; position: absolute; right: -80px; top: -80px;
    width: 350px; height: 350px; border-radius: 50%;
    background: rgba(255,255,255,0.08); pointer-events: none;
}
.hero-content { position: relative; z-index: 1; max-width: 600px; margin: 0 auto; }
.site-title { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 12px; }
.site-game-icon { font-size: clamp(32px, 5vw, 44px); filter: drop-shadow(0 2px 8px rgba(0,0,0,0.2)); }
.site-title h1 { font-size: clamp(28px, 5vw, 42px); font-weight: 800; letter-spacing: -0.5px; }
.site-hero p { font-size: clamp(15px, 2.5vw, 19px); opacity: 0.92; }

/* ========== 搜索框 ========== */
.search-section {
    max-width: 640px; margin: -28px auto 0; padding: 0 20px;
    position: relative; z-index: 10;
}
.search-form {
    display: flex; align-items: center;
    background: var(--card-bg); border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    padding: 6px 6px 6px 20px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}
.search-form:focus-within {
    box-shadow: 0 8px 30px rgba(67, 100, 247, 0.2);
    border-color: rgba(67, 100, 247, 0.3);
}
.search-form input {
    flex: 1; border: none; outline: none; background: transparent;
    font-size: 16px; color: var(--text-primary); min-width: 0;
}
.search-form input::placeholder { color: #b0b8c4; }
.search-form button {
    background: var(--tech-gradient); color: #fff; border: none;
    padding: 12px 28px; border-radius: 12px; font-size: 15px; font-weight: 600;
    cursor: pointer; transition: var(--transition); white-space: nowrap;
}

/* ========== 分类导航 ========== */
.category-nav {
    max-width: 1200px; margin: 28px auto 0; padding: 0 24px;
    display: flex; justify-content: center;
}
.category-list { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.category-button {
    padding: 10px 24px; border-radius: 24px; font-size: 14px; font-weight: 600;
    background: var(--card-bg); color: var(--text-secondary);
    border: 1px solid var(--border-light); transition: var(--transition); cursor: pointer;
}
.category-button:hover, .category-button.active {
    border-color: var(--tech-color-mid); color: var(--tech-color-mid);
}
.category-button.active {
    background: var(--tech-gradient); color: #fff; border-color: transparent;
    box-shadow: 0 4px 15px rgba(67, 100, 247, 0.35);
}

/* ========== 资源网格与卡片 ========== */
.resource-section {
    max-width: 1200px; margin: 28px auto 0; padding: 0 24px 60px; flex: 1;
}
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.resource-card {
    background: var(--card-bg); border-radius: var(--radius-md);
    box-shadow: var(--shadow-card); overflow: hidden;
    transition: var(--transition); display: flex; flex-direction: column;
    border: 1px solid var(--border-light);
    position: relative;
}
.resource-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(67, 100, 247, 0.15);
}
.resource-card.hidden { display: none; }

.resource-cover-link {
    display: block; width: 100%; aspect-ratio: 16 / 9; background: #eef1f6;
}
.resource-cover-link::after {
    content: ''; position: absolute; inset: 0; z-index: 1;
}

.resource-cover { width: 100%; height: 100%; transition: transform 0.4s ease; }
.resource-card:hover .resource-cover { transform: scale(1.05); }

.resource-card-body { padding: 16px 18px 18px; flex: 1; display: flex; flex-direction: column; }
.resource-card-body h2 {
    font-size: 16px; font-weight: 700; line-height: 1.4; margin-bottom: 10px;
    word-break: break-word;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.resource-card:hover .resource-card-body h2 { color: var(--tech-color-mid); }

.resource-tags {
    display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto;
    position: relative; z-index: 2;
}
.resource-tags span {
    padding: 3px 10px; border-radius: 6px; font-size: 11px; font-weight: 600;
    background: rgba(67, 100, 247, 0.08); color: var(--tech-color-mid);
}

.no-result {
    grid-column: 1 / -1; text-align: center; padding: 60px 20px;
    color: var(--text-secondary); font-size: 16px; display: none;
}
.no-result.show { display: block; }

/* ========== 内容页导航（含新增帮助按钮） ========== */
.nav {
    position: sticky; top: 0; z-index: 100;
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.85);
    border-bottom: 1px solid rgba(0,0,0,0.04);
}
.nav-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.back-btn {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 15px; color: var(--text-secondary);
    padding: 6px 14px; border-radius: 8px; transition: var(--transition);
}
.back-btn:hover { background: rgba(0,0,0,0.05); color: var(--text-primary); }
.back-btn span { font-size: 18px; line-height: 1; }

/* ✅ 新增：内容页右侧帮助按钮 */
.nav-help-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 6px 14px;
    border-radius: 8px;
    transition: var(--transition);
}
.nav-help-btn:hover {
    background: rgba(67, 100, 247, 0.08);
    color: var(--tech-color-mid);
}

/* ========== 内容页主体 ========== */
.cover-wrap { max-width: 800px; margin: 20px auto 0; padding: 0 16px; }
.cover-wrap img {
    width: 100%; height: clamp(160px, 35vw, 260px);
    object-fit: cover; border-radius: var(--card-radius); box-shadow: var(--shadow-card);
}

.content-container {
    max-width: 800px; margin: -40px auto 0; padding: 0 16px 40px;
    position: relative; z-index: 10;
    display: flex; flex-direction: column; gap: 16px;
}

.card {
    background: var(--card-bg); border-radius: var(--card-radius);
    box-shadow: var(--shadow-card); padding: 24px; transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow-hover); }

.product-info { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.app-icon {
    width: 72px; height: 72px; border-radius: 18px; object-fit: cover;
    flex-shrink: 0; box-shadow: 0 2px 12px rgba(0,0,0,0.1); background: #eee;
}
.product-text { flex: 1; min-width: 0; }
.product-text h1 {
    font-size: clamp(18px, 4vw, 22px); font-weight: 700;
    line-height: 1.3; margin-bottom: 4px; word-break: break-word;
}
.update-time { font-size: 13px; color: var(--text-secondary); }

.download-btn {
    background: var(--tech-gradient); color: #fff;
    padding: 12px 28px; border-radius: 12px;
    font-size: 15px; font-weight: 600; white-space: nowrap;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(67, 100, 247, 0.4);
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(67, 100, 247, 0.55); }
.download-btn:active { transform: translateY(0); }

.group-card {
    background: var(--tech-gradient);
    display: flex; flex-direction: column; align-items: center;
    text-align: center; color: #fff; gap: 12px;
}
.group-icon {
    width: 48px; height: 48px; border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.group-card h2 { font-size: 18px; font-weight: 600; }
.group-card p { font-size: 14px; opacity: 0.9; }
.group-number-btn {
    background: rgba(255,255,255,0.2); color: #fff;
    padding: 10px 24px; border-radius: 10px;
    font-size: 16px; font-weight: 700; letter-spacing: 1px;
    transition: var(--transition); backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,0.3);
}
.group-number-btn:hover { background: rgba(255,255,255,0.35); border-color: rgba(255,255,255,0.5); }

.desc-card h2 {
    font-size: 17px; font-weight: 600; margin-bottom: 12px;
    padding-left: 12px; border-left: 3px solid #4364f7;
}
.desc-content { font-size: 15px; color: var(--text-secondary); line-height: 1.8; word-break: break-word; }

/* ========== 页脚 ========== */
footer, .site-footer {
    background: #fff; border-top: 1px solid var(--border-light);
    text-align: center; padding: 28px 24px;
    font-size: 13px; color: var(--text-secondary); margin-top: auto;
}

/* ========== 弹窗 ========== */
.modal-overlay {
    position: fixed; inset: 0; z-index: 1000;
    display: flex; align-items: center; justify-content: center; padding: 20px;
    opacity: 0; visibility: hidden; transition: var(--transition);
}
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal-mask { position: absolute; inset: 0; background: rgba(0,0,0,0.5); backdrop-filter: blur(4px); }
.modal-dialog {
    position: relative; background: var(--card-bg); border-radius: 20px;
    padding: 32px 28px; max-width: 400px; width: 100%; text-align: center;
    transform: scale(0.9) translateY(20px); transition: var(--transition);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}
.modal-overlay.show .modal-dialog { transform: scale(1) translateY(0); }
.modal-close {
    position: absolute; top: 12px; right: 16px; font-size: 24px;
    color: var(--text-secondary); background: none; padding: 4px 8px; border-radius: 6px;
}
.modal-close:hover { background: rgba(0,0,0,0.05); }
.modal-icon {
    width: 60px; height: 60px; background: var(--tech-gradient); border-radius: 50%;
    display: flex; align-items: center; justify-content: center; margin: 0 auto 16px;
}
.modal-icon svg { width: 28px; height: 28px; color: #fff; }
.modal-title { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.modal-body {
    font-size: 14px; color: var(--text-secondary); line-height: 1.8;
    background: #f9fafb; padding: 14px 16px; border-radius: 12px; margin-bottom: 20px; text-align: left;
}
.modal-actions { display: flex; gap: 12px; }
.modal-actions button, .modal-actions a {
    flex: 1; padding: 12px; border-radius: 12px; font-size: 15px; font-weight: 600;
    text-align: center; transition: var(--transition);
}
.btn-cancel { background: #f3f4f6; color: var(--text-secondary); }
.btn-cancel:hover { background: #e5e7eb; }
.btn-confirm { background: var(--tech-gradient); color: #fff; box-shadow: 0 4px 15px rgba(67,100,247,0.4); }
.btn-confirm:hover { box-shadow: 0 6px 25px rgba(67,100,247,0.55); }

/* ========== Toast 提示 ========== */
.toast {
    position: fixed; bottom: 40px; left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(0,0,0,0.8); color: #fff; padding: 10px 24px;
    border-radius: 24px; font-size: 14px; opacity: 0; visibility: hidden;
    transition: var(--transition); z-index: 2000; white-space: nowrap;
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ========== 响应式 ========== */
@media (max-width: 480px) {
    .resource-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .resource-card-body { padding: 12px 14px 14px; }
    .resource-card-body h2 { font-size: 14px; }
    .search-form button { padding: 10px 18px; font-size: 14px; }
    .product-info { flex-direction: column; text-align: center; }
    .download-btn { width: 100%; }
    .content-container { margin-top: -30px; }
}