/* 五子棋 - 左右布局版 */

:root {
    --color-bg: #f5f5f5;
    --color-board: #dcb35c;
    --color-board-line: #8b6914;
    --color-black: #1a1a1a;
    --color-white: #ffffff;
    --color-primary: #2563eb;
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

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

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-black);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: stretch;
    padding: 12px;
}

.container {
    max-width: 1020px;
    width: 100%;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* 教程展开时页面整体可滚动；收起时棋盘区一屏内自适应 */
.container:has(details[open].tutorial-panel) {
    max-height: none;
}

.game-wrapper {
    display: flex;
    gap: 20px;
    flex: 1;
    min-height: calc(100vh - 120px);  /* 收起教程时：棋盘+控件占满一屏 */
    align-items: stretch;
}

/* ===== 左侧控制面板 ===== */
.side-panel {
    width: 220px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow-y: auto;
}

header {
    text-align: center;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
}

.game-info {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background: #f8fafc;
    border-radius: var(--radius);
}

.info-item {
    text-align: center;
    flex: 1;
}

.info-item .label {
    display: block;
    font-size: 0.68rem;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
    white-space: nowrap;
}

.info-item .value {
    display: block;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-black);
    white-space: nowrap;
}

.mode-buttons {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    justify-content: center;
}

.mode-btn {
    padding: 5px 10px;
    border: 1.5px solid #cbd5e1;
    background: white;
    border-radius: 16px;
    font-size: 0.78rem;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--color-secondary);
}

.mode-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.mode-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    font-weight: 500;
}

.game-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.btn {
    padding: 8px 10px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: #1d4ed8;
}

.btn-hint {
    background: var(--color-success);
    color: white;
}

.btn-hint:hover {
    background: #059669;
}

.btn-secondary {
    background: #e2e8f0;
    color: var(--color-black);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.game-status {
    margin-top: auto;
}

.message {
    padding: 8px 12px;
    background: #f8fafc;
    border-radius: var(--radius);
    font-size: 0.82rem;
    color: var(--color-secondary);
    word-break: break-all;
}

.message.success {
    background: #d1fae5;
    color: var(--color-success);
}

.message.danger {
    background: #fee2e2;
    color: var(--color-danger);
}

.message.warning {
    background: #fef3c7;
    color: var(--color-warning);
}

/* ===== 右侧棋盘 ===== */
.board-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 0;
    min-height: 0;
}

#board {
    max-width: 100%;
    max-height: 100%;
    aspect-ratio: 1/1;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    object-fit: contain;
}

/* ===== 教学面板（棋盘下方，可折叠）===== */
.tutorial-panel {
    background: #f8fafc;
    border-radius: var(--radius);
    padding: 8px 14px;
    border: 1px solid #e2e8f0;
    flex-shrink: 0;
}

.tutorial-panel summary {
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--color-black);
    user-select: none;
}

.tutorial-panel summary:hover {
    color: var(--color-primary);
}

.tutorial-content {
    margin-top: 10px;
}

/* 课程章节导航 */
.course-toc {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.course-toc span {
    font-size: 0.75rem;
    color: var(--color-primary);
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 12px;
    padding: 3px 10px;
    white-space: nowrap;
}

.chapter-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-black);
    margin: 18px 0 8px;
    padding-left: 10px;
    border-left: 4px solid var(--color-primary);
}

.chapter-title:first-of-type {
    margin-top: 4px;
}

/* 卡片网格：宽屏两列，窄屏单列 */
.pattern-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 6px;
}

.pattern-card {
    background: white;
    border-radius: 6px;
    padding: 10px 12px;
    border-left: 3px solid var(--color-primary);
}

/* 杀招章：红色系 */
.pattern-card.kill {
    border-left-color: #ef4444;
    background: #fff8f8;
}

.pattern-card.kill h4 {
    color: #b91c1c;
}

/* 错误章：橙色系 */
.pattern-card.warn {
    border-left-color: #f59e0b;
    background: #fffdf5;
}

.pattern-card.warn h4 {
    color: #b45309;
}

.tutorial-intro {
    font-size: 0.82rem;
    color: var(--color-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}

.pattern-card {
    background: white;
    border-radius: 6px;
    padding: 10px 12px;
    border-left: 3px solid var(--color-primary);
    margin-bottom: 0;
}

.pattern-card h4 {
    font-size: 0.88rem;
    margin-bottom: 5px;
    color: var(--color-black);
}

.pattern-demo {
    font-size: 1.05rem;
    letter-spacing: 3px;
    color: #1a1a1a;
    background: #fef9c3;
    display: inline-block;
    padding: 3px 10px;
    border-radius: 4px;
    margin-bottom: 5px;
    font-weight: bold;
}

.pattern-card p {
    font-size: 0.78rem;
    color: var(--color-secondary);
    line-height: 1.6;
    margin: 0;
}

.tutorial-tip {
    font-size: 0.8rem;
    background: #d1fae5;
    padding: 8px 12px;
    border-radius: 6px;
    color: #065f46;
    margin-top: 4px;
}

footer {
    text-align: center;
    font-size: 0.72rem;
    color: var(--color-secondary);
    flex-shrink: 0;
}

/* ===== 响应式：窄屏改为上下紧凑布局 ===== */
@media (max-width: 760px) {
    body {
        padding: 8px;
        align-items: flex-start;
    }

    .container {
        padding: 10px 12px;
        gap: 8px;
        max-height: none;
        overflow: visible;
    }

    .game-wrapper {
        flex-direction: column;
        gap: 10px;
    }

    .side-panel {
        width: 100%;
        gap: 8px;
    }

    header {
        display: none;  /* 手机上隐藏大标题，节省空间 */
    }

    .game-info {
        padding: 6px 8px;
    }

    .game-controls {
        grid-template-columns: repeat(4, 1fr);
        gap: 5px;
    }

    .btn {
        padding: 7px 4px;
        font-size: 0.8rem;
    }

    .game-status {
        margin-top: 0;
    }

    .message {
        padding: 6px 10px;
        font-size: 0.78rem;
        text-align: center;
    }

    /* 棋盘边长 = min(容器宽度, 视口高度 - 控件区高度)，
       保证棋盘与控件同屏，不会盖住按钮或被教学面板压住 */
    .board-container {
        width: 100%;
    }

    #board {
        width: min(100%, calc(100vh - 260px));
        width: min(100%, calc(100dvh - 260px));
        height: auto;
        max-height: none;
    }

    /* 教程展开时用自然高度，页面整体滚动，可视区域最大化 */
    .tutorial-panel {
        max-height: none;
        overflow-y: visible;
    }

    /* 课程卡片窄屏单列 */
    .pattern-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}