* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(41, 87, 200, 0.12), transparent 28%),
        linear-gradient(180deg, #f7f9fc 0%, var(--app-bg) 100%);
    color: var(--app-text);
}

/* ===== 主页布局 ===== */

.hub {
    max-width: 1320px;
    margin: 0 auto;
    padding: 40px 24px 60px;
}

.hub-header {
    text-align: center;
    margin-bottom: 40px;
}

.hub-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

.hub-brand-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    padding: 10px;
    background: var(--app-primary-soft);
    box-shadow: inset 0 0 0 1px rgba(41, 87, 200, 0.08);
}

.hub-brand-eyebrow {
    margin: 0 0 4px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--app-text-muted);
}

.hub-brand-title {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
}

.hub-subtitle {
    margin: 0;
    color: var(--app-text-muted);
    font-size: 15px;
}

/* ===== 年龄 / 设备筛选 Tab ===== */

/* 两组 Tab 合并展示为一行：组间用大间距区分「年龄」「设备」两个维度，窄屏整组换行 */
.hub-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 28px;
    margin-bottom: 12px;
}

.hub-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

/* 筛选区紧邻卡片区，用相邻选择器与卡片区拉开距离 */
.hub-filters + .hub-grid {
    margin-top: 16px;
}

.hub-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--app-border);
    border-radius: 999px;
    background: var(--app-panel-muted);
    color: var(--app-text-muted);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition:
        background var(--app-transition),
        color var(--app-transition),
        border-color var(--app-transition);
}

.hub-tab:hover {
    border-color: var(--app-border-strong);
    color: var(--app-text);
}

.hub-tab[aria-selected="true"] {
    background: var(--app-primary);
    border-color: var(--app-primary);
    color: var(--app-on-primary);
}

.hub-tab-count {
    font-size: 12px;
    font-weight: 500;
    opacity: 0.75;
}

.hub-empty {
    grid-column: 1 / -1;
    margin: 0;
    padding: 48px 16px;
    text-align: center;
    color: var(--app-text-muted);
    font-size: 14px;
}

/* ===== 卡片网格 ===== */

.hub-grid {
    display: grid;
    /* 卡片最小宽度 215px：1320px 容器下桌面端一行 5 张，窄屏自动回落 4/3/2 张 */
    grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
    gap: 14px;
}

.game-card {
    display: flex;
    flex-direction: column;
    background: var(--app-panel);
    border: 1px solid rgba(215, 222, 234, 0.9);
    border-radius: var(--app-radius-md);
    box-shadow: var(--app-shadow-soft);
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition:
        transform var(--app-transition),
        border-color var(--app-transition),
        box-shadow var(--app-transition);
}

.game-card:hover {
    transform: translateY(-2px);
    border-color: var(--app-border-strong);
    box-shadow: var(--app-shadow);
}

.game-card:active {
    transform: translateY(0);
}

.game-card-banner {
    height: 92px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    line-height: 1;
    position: relative;
    overflow: hidden;
}

.game-card-body {
    padding: 12px 14px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.game-card-title {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
}

.game-card-desc {
    margin: 0;
    color: var(--app-text-muted);
    font-size: 12px;
    line-height: 1.5;
    flex: 1;
}

.game-card-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.03em;
    align-self: flex-start;
}

/* 每个游戏的 banner 配色 */
.game-card[data-slug="2048"] .game-card-banner { background: linear-gradient(135deg, #fef3c7, #fde68a); }
.game-card[data-slug="2048"] .game-card-tag { background: #fef3c7; color: #92400e; }

.game-card[data-slug="gomoku-advanced"] .game-card-banner { background: linear-gradient(135deg, #e8efff, #c7d7fe); }
.game-card[data-slug="gomoku-advanced"] .game-card-tag { background: #e8efff; color: #1e40af; }

.game-card[data-slug="tetris"] .game-card-banner { background: linear-gradient(135deg, #e6fbee, #bbf7d0); }
.game-card[data-slug="tetris"] .game-card-tag { background: #e6fbee; color: #166534; }

.game-card[data-slug="maze"] .game-card-banner { background: linear-gradient(135deg, #fef3c7, #fed7aa); }
.game-card[data-slug="maze"] .game-card-tag { background: #fff7ed; color: #9a3412; }

.game-card[data-slug="color-challenge"] .game-card-banner { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }
.game-card[data-slug="color-challenge"] .game-card-tag { background: #fce7f3; color: #9d174d; }

.game-card[data-slug="sliding-puzzle"] .game-card-banner { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.game-card[data-slug="sliding-puzzle"] .game-card-tag { background: #ede9fe; color: #5b21b6; }

.game-card[data-slug="hidden-cats"] .game-card-banner { background: linear-gradient(135deg, #ecfdf5, #d1fae5); }
.game-card[data-slug="hidden-cats"] .game-card-tag { background: #ecfdf5; color: #065f46; }

.game-card[data-slug="yibihua"] .game-card-banner { background: linear-gradient(135deg, #e0f2fe, #bae6fd); }
.game-card[data-slug="yibihua"] .game-card-tag { background: #e0f2fe; color: #0c4a6e; }

.game-card[data-slug="animal-flip-chess"] .game-card-banner { background: linear-gradient(135deg, #ffedd5, #fed7aa); }
.game-card[data-slug="animal-flip-chess"] .game-card-tag { background: #ffedd5; color: #9a3412; }

.game-card[data-slug="pipes"] .game-card-banner { background: linear-gradient(135deg, #cffafe, #a5f3fc); }
.game-card[data-slug="pipes"] .game-card-tag { background: #cffafe; color: #155e75; }

.game-card[data-slug="lights-out"] .game-card-banner { background: linear-gradient(135deg, #e0e7ff, #c7d2fe); }
.game-card[data-slug="lights-out"] .game-card-tag { background: #e0e7ff; color: #3730a3; }

.game-card[data-slug="minesweeper"] .game-card-banner { background: linear-gradient(135deg, #fee2e2, #fecaca); }
.game-card[data-slug="minesweeper"] .game-card-tag { background: #fee2e2; color: #991b1b; }

.game-card[data-slug="typing-cannon"] .game-card-banner { background: linear-gradient(135deg, #ecfccb, #d9f99d); }
.game-card[data-slug="typing-cannon"] .game-card-tag { background: #ecfccb; color: #3f6212; }

.game-card[data-slug="math-hero"] .game-card-banner { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.game-card[data-slug="math-hero"] .game-card-tag { background: #dbeafe; color: #1e40af; }

.game-card[data-slug="zh-poem"] .game-card-banner { background: linear-gradient(135deg, #fae8ff, #f5d0fe); }
.game-card[data-slug="zh-poem"] .game-card-tag { background: #fae8ff; color: #86198f; }

.game-card[data-slug="pinyin-typing"] .game-card-banner { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.game-card[data-slug="pinyin-typing"] .game-card-tag { background: #d1fae5; color: #065f46; }

.game-card[data-slug="snake"] .game-card-banner { background: linear-gradient(135deg, #dcfce7, #86efac); }
.game-card[data-slug="snake"] .game-card-tag { background: #dcfce7; color: #14532d; }

.game-card[data-slug="breakout"] .game-card-banner { background: linear-gradient(135deg, #dbeafe, #93c5fd); }
.game-card[data-slug="breakout"] .game-card-tag { background: #dbeafe; color: #1e3a8a; }

.game-card[data-slug="math-24"] .game-card-banner { background: linear-gradient(135deg, #fef3c7, #fde68a); }
.game-card[data-slug="math-24"] .game-card-tag { background: #fef3c7; color: #92400e; }

.game-card[data-slug="nonogram"] .game-card-banner { background: linear-gradient(135deg, #ede9fe, #c4b5fd); }
.game-card[data-slug="nonogram"] .game-card-tag { background: #ede9fe; color: #4c1d95; }

.game-card[data-slug="sokoban"] .game-card-banner { background: linear-gradient(135deg, #ffedd5, #fdba74); }
.game-card[data-slug="sokoban"] .game-card-tag { background: #ffedd5; color: #7c2d12; }

.game-card[data-slug="idiom-guess"] .game-card-banner { background: linear-gradient(135deg, #ffe4e6, #fecdd3); }
.game-card[data-slug="idiom-guess"] .game-card-tag { background: #ffe4e6; color: #881337; }

/* ===== 响应式 ===== */

@media (max-width: 640px) {
    .hub {
        padding: 24px 16px 40px;
    }

    .hub-header {
        margin-bottom: 24px;
    }

    .hub-filters {
        gap: 6px 16px;
        margin-bottom: 10px;
    }

    .hub-tabs {
        gap: 6px;
    }

    .hub-filters + .hub-grid {
        margin-top: 12px;
    }

    .hub-tab {
        padding: 6px 12px;
        font-size: 13px;
    }

    .hub-brand-title {
        font-size: 24px;
    }

    .hub-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .game-card-banner {
        height: 80px;
        font-size: 36px;
    }

    .game-card-body {
        padding: 12px;
    }

    .game-card-title {
        font-size: 15px;
    }

    .game-card-desc {
        font-size: 12px;
    }

    .game-card-tag {
        display: none;
    }
}

@media (max-width: 360px) {
    .hub-grid {
        grid-template-columns: 1fr;
    }

    .game-card-banner {
        height: 60px;
    }
}

/* 说明：游戏页共享返回按钮样式已随 js/game-back.js 自包含注入，此处不再重复定义 */