/* ===== 全局变量 ===== */
:root {
    --color-bg: #fafaf7;
    --color-surface: #ffffff;
    --color-text: #2c2c2c;
    --color-text-light: #7a7a7a;
    --color-text-lighter: #aaaaaa;
    --color-primary: #5b8c7c;
    --color-primary-hover: #4a7568;
    --color-border: #ececec;
    --color-tag-bg: #f0f4f2;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --container-width: 760px;
    --font-serif: "Georgia", "Source Han Serif SC", "Noto Serif CJK SC", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.75;
    font-size: 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== 顶部导航 ===== */
.navbar {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.85);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: 0.5px;
}

.nav-logo:hover {
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    gap: 1.75rem;
    list-style: none;
}

.nav-menu a {
    color: var(--color-text-light);
    font-size: 0.95rem;
    position: relative;
    padding: 0.25rem 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-text);
}

.nav-menu a.active::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

/* 移动端汉堡菜单 */
.nav-toggle {
    display: none;
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: space-around;
    align-items: stretch;
    padding: 4px 0;
    -webkit-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: transparent;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
    flex-shrink: 0;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== 主内容容器 ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 2.5rem 1.25rem;
    flex: 1;
    width: 100%;
}

/* ===== Hero 区域（首页） ===== */
.hero {
    text-align: center;
    padding: 2rem 0 3rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 2.5rem;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 2.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    letter-spacing: 0.5px;
}

.hero p {
    color: var(--color-text-light);
    font-size: 1.05rem;
}

/* ===== 文章列表 ===== */
.post-list {
    list-style: none;
}

.post-item {
    padding: 1.75rem 0;
    border-bottom: 1px solid var(--color-border);
    transition: transform 0.2s ease;
}

.post-item:last-child {
    border-bottom: none;
}

.post-item:hover {
    transform: translateX(4px);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-lighter);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.post-meta .dot {
    width: 3px;
    height: 3px;
    background-color: var(--color-text-lighter);
    border-radius: 50%;
}

.post-title {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.post-title a {
    color: var(--color-text);
}

.post-title a:hover {
    color: var(--color-primary);
}

.post-excerpt {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.2rem 0.7rem;
    background-color: var(--color-tag-bg);
    color: var(--color-primary);
    font-size: 0.78rem;
    border-radius: 20px;
    transition: background-color 0.2s ease;
}

.tag:hover {
    background-color: var(--color-primary);
    color: #fff;
}

/* ===== 文章详情页 ===== */
.article {
    padding: 1rem 0;
}

.article-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    line-height: 1.3;
    margin-bottom: 1rem;
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.9;
}

.article-content h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin: 2.5rem 0 1rem;
    padding-left: 0.75rem;
    border-left: 4px solid var(--color-primary);
}

.article-content h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    margin: 2rem 0 0.75rem;
}

.article-content p {
    margin-bottom: 1.25rem;
}

.article-content blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.25rem;
    background-color: var(--color-tag-bg);
    border-left: 4px solid var(--color-primary);
    color: var(--color-text-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-content code {
    background-color: var(--color-tag-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: "SF Mono", Menlo, Consolas, monospace;
}

.article-content pre {
    background-color: #2c2c2c;
    color: #f4f4f4;
    padding: 1rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 1.25rem 0;
    font-size: 0.9rem;
    line-height: 1.6;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.article-content ul,
.article-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
}

.article-content li {
    margin-bottom: 0.35rem;
}

.article-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.back-link:hover {
    color: var(--color-primary);
}

/* ===== 关于我页面 ===== */
.about-section {
    text-align: center;
    padding: 1.5rem 0;
}

.about-avatar {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.about-avatar img {
    width: 100%;
    height: 100%;
    display: block;
}

.about-section h1 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.about-section .subtitle {
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.about-content {
    text-align: left;
    line-height: 1.9;
    font-size: 1rem;
}

.about-content h2 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    margin: 2rem 0 0.75rem;
    padding-left: 0.6rem;
    border-left: 3px solid var(--color-primary);
}

.about-content p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.social-link {
    padding: 0.5rem 1.2rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--color-text);
    transition: all 0.2s ease;
}

.social-link:hover {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* ===== 归档页 ===== */
.archive-section {
    margin-bottom: 2.5rem;
}

.archive-year {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
    padding-bottom: 0.25rem;
}

.archive-list {
    list-style: none;
}

.archive-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.65rem 0;
    border-bottom: 1px dashed var(--color-border);
}

.archive-item:last-child {
    border-bottom: none;
}

.archive-date {
    color: var(--color-text-lighter);
    font-size: 0.85rem;
    font-family: var(--font-serif);
    min-width: 50px;
}

.archive-title {
    color: var(--color-text);
    font-size: 1rem;
    flex: 1;
}

.archive-title:hover {
    color: var(--color-primary);
}

/* ===== 页脚 ===== */
.footer {
    text-align: center;
    padding: 2rem 1.25rem;
    color: var(--color-text-lighter);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.footer p {
    margin-bottom: 0.3rem;
}

/* ===== 响应式：移动端适配 ===== */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .nav-container {
        padding: 0 1rem;
        height: 56px;
    }

    .nav-menu {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu.active {
        max-height: 300px;
    }

    .nav-menu li {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: 0.9rem 1rem;
        font-size: 1rem;
    }

    .nav-menu a.active::after {
        display: none;
    }

    .nav-menu a.active {
        color: var(--color-primary);
        background-color: var(--color-tag-bg);
    }

    .nav-toggle {
        display: flex;
    }

    .container {
        padding: 1.75rem 1rem;
    }

    .hero {
        padding: 1rem 0 2rem;
        margin-bottom: 1.75rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .post-item {
        padding: 1.25rem 0;
    }

    .post-item:hover {
        transform: none;
    }

    .post-title {
        font-size: 1.2rem;
    }

    .article-header h1 {
        font-size: 1.55rem;
    }

    .article-content {
        font-size: 1rem;
    }

    .article-content h2 {
        font-size: 1.3rem;
    }

    .about-avatar {
        width: 90px;
        height: 90px;
    }

    .about-section h1 {
        font-size: 1.5rem;
    }

    .archive-year {
        font-size: 1.5rem;
    }

    .archive-item {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}

@media (max-width: 380px) {
    .container {
        padding: 1.5rem 0.875rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }
}

/* ===== 游园：游戏入口卡片 ===== */
.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-top: 1rem;
}

.game-card {
    display: block;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.25rem;
    text-align: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    color: var(--color-text);
}

.game-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    color: var(--color-text);
}

.game-card-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    line-height: 1;
}

.game-card-title {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.game-card-desc {
    color: var(--color-text-light);
    font-size: 0.88rem;
    line-height: 1.6;
}

/* ===== 游戏通用 ===== */
.game-wrap {
    text-align: center;
}

.game-toolbar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 1.25rem 0 1.5rem;
    flex-wrap: wrap;
}

.score-box {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.9rem;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.score-box strong {
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 1.1rem;
    margin-left: 0.3rem;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    background-color: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-family: inherit;
}

.btn:hover {
    background-color: var(--color-primary-hover);
    color: #fff;
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-ghost:hover {
    background-color: var(--color-primary);
    color: #fff;
}

.game-tip {
    color: var(--color-text-lighter);
    font-size: 0.85rem;
    margin-top: 1rem;
}

/* ===== 2048 ===== */
.board-2048 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 10px;
    background-color: #cdc8b8;
    border-radius: var(--radius-md);
    max-width: 380px;
    margin: 0 auto;
    aspect-ratio: 1 / 1;
    touch-action: none;
    user-select: none;
}

.cell-2048 {
    background-color: rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1rem, 5vw, 1.8rem);
    color: #2c2c2c;
    transition: transform 0.15s ease;
}

.cell-2048[data-v="2"]    { background: #eee4da; }
.cell-2048[data-v="4"]    { background: #ede0c8; }
.cell-2048[data-v="8"]    { background: #f2b179; color: #fff; }
.cell-2048[data-v="16"]   { background: #f59563; color: #fff; }
.cell-2048[data-v="32"]   { background: #f67c5f; color: #fff; }
.cell-2048[data-v="64"]   { background: #f65e3b; color: #fff; }
.cell-2048[data-v="128"]  { background: #edcf72; color: #fff; font-size: clamp(0.9rem, 4.5vw, 1.6rem); }
.cell-2048[data-v="256"]  { background: #edcc61; color: #fff; font-size: clamp(0.9rem, 4.5vw, 1.6rem); }
.cell-2048[data-v="512"]  { background: #edc850; color: #fff; font-size: clamp(0.9rem, 4.5vw, 1.6rem); }
.cell-2048[data-v="1024"] { background: #edc53f; color: #fff; font-size: clamp(0.8rem, 4vw, 1.4rem); }
.cell-2048[data-v="2048"] { background: #edc22e; color: #fff; font-size: clamp(0.8rem, 4vw, 1.4rem); }

.cell-2048.pop {
    animation: pop 0.18s ease;
}

@keyframes pop {
    0% { transform: scale(0.6); }
    100% { transform: scale(1); }
}

/* ===== 记忆翻牌 ===== */
.memory-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    max-width: 380px;
    margin: 0 auto;
    perspective: 1000px;
}

.memory-card {
    aspect-ratio: 1 / 1;
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.5s;
}

.memory-card.flipped,
.memory-card.matched {
    transform: rotateY(180deg);
}

.memory-card.matched {
    cursor: default;
}

.memory-face {
    position: absolute;
    inset: 0;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1.5rem, 7vw, 2.2rem);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.memory-front {
    background: linear-gradient(135deg, #a8d5c1, #5b8c7c);
    color: #fff;
    font-family: var(--font-serif);
    font-weight: 600;
}

.memory-back {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    transform: rotateY(180deg);
}

.memory-card.matched .memory-back {
    background-color: var(--color-tag-bg);
}

/* ===== 通用游戏状态文字 ===== */
.ttt-status,
.game-status {
    margin: 0.5rem 0 1.2rem;
    font-size: 1rem;
    color: var(--color-text);
    min-height: 1.5em;
}

.ttt-status.win,
.game-status.win {
    color: var(--color-primary);
    font-weight: 600;
}

/* ===== 五子棋 ===== */
.gomoku-difficulty {
    display: inline-flex;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 3px;
    overflow: hidden;
}

.gomoku-difficulty button {
    background: transparent;
    border: none;
    padding: 0.35rem 0.9rem;
    font-size: 0.85rem;
    color: var(--color-text-light);
    cursor: pointer;
    border-radius: 16px;
    font-family: inherit;
    transition: all 0.2s ease;
}

.gomoku-difficulty button.active {
    background-color: var(--color-primary);
    color: #fff;
}

.gomoku-board-wrap {
    display: inline-block;
    background-color: #e8c98a;
    padding: 14px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    max-width: 100%;
}

.gomoku-board {
    position: relative;
    background-color: #e8c98a;
    touch-action: manipulation;
    user-select: none;
}

.gomoku-board canvas {
    display: block;
    cursor: pointer;
    max-width: 100%;
    height: auto;
}

.gomoku-board.disabled canvas {
    cursor: not-allowed;
}

@media (max-width: 480px) {
    .gomoku-board-wrap {
        padding: 8px;
    }
}