/* ============================================================
   GeoCommunity — Layout
   ============================================================ */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--sp-5);
    padding-right: var(--sp-5);
}

/* ============ Header ============ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--bg-primary) 86%, transparent);
    -webkit-backdrop-filter: saturate(1.1) blur(10px);
    backdrop-filter: saturate(1.1) blur(10px);
    border-bottom: 1px solid var(--border-light);
}

.site-header-inner {
    height: var(--header-h);
    display: flex;
    align-items: center;
    gap: var(--sp-5);
}

/* 品牌 */
.brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    text-decoration: none;
    color: var(--text-primary);
    flex-shrink: 0;
}

.brand:hover {
    color: var(--text-primary);
}

.brand-mark {
    color: var(--accent);
    flex-shrink: 0;
}

.brand-name {
    font-size: 17.5px;
    letter-spacing: -0.01em;
}

/* 主导航（桌面）*/
.primary-nav {
    margin-left: auto;
}

.primary-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    gap: var(--sp-1);
}

.primary-nav a {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: var(--r-2);
    font-size: 14.5px;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background-color var(--dur-fast) var(--ease),
                color var(--dur-fast) var(--ease);
}

.primary-nav a:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    text-decoration: none;
}

.primary-nav .current-menu-item > a,
.primary-nav .is-active > a {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

/* 右侧操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
    flex-shrink: 0;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: var(--r-2);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background-color var(--dur-fast) var(--ease),
                color var(--dur-fast) var(--ease);
}

.icon-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

/* 主题切换图标 */
.icon-btn .icon-sun { display: none; }
.icon-btn .icon-moon { display: block; }

[data-theme="dark"] .icon-btn .icon-sun { display: block; }
[data-theme="dark"] .icon-btn .icon-moon { display: none; }

/* 移动端菜单 */
.menu-toggle { display: none; }

.mobile-nav {
    display: none;
    border-top: 1px solid var(--border-light);
    background: var(--bg-primary);
    padding: var(--sp-2) var(--sp-4) var(--sp-4);
}

.mobile-nav.is-open { display: block; animation: gc-fade-in var(--dur) var(--ease); }

.mobile-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav a {
    display: block;
    padding: 10px var(--sp-3);
    border-radius: var(--r-2);
    font-size: 15px;
    color: var(--text-secondary);
    text-decoration: none;
}

.mobile-nav a:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    text-decoration: none;
}

/* ============ Hero（首页第一屏：左文右图）============ */
.hero {
    padding: clamp(72px, 11vh, 120px) 0 var(--sp-7);
}

.hero-grid {
    max-width: 1040px;
    display: grid;
    grid-template-columns: minmax(0, 460px) minmax(0, 1fr);
    gap: var(--sp-8);
    align-items: center;
}

.hero-inner {
    max-width: 460px;
}

.hero-figure {
    margin: 0;
}

.hero-figure img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--r-5);
    border: 1px solid var(--border-light);
}

@media (max-width: 1023px) {
    .hero-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--sp-6);
    }

    .hero-inner {
        max-width: 640px;
    }

    .hero-figure {
        max-width: 640px;
    }
}

.hero-eyebrow {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    font-size: 14px;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    margin-bottom: var(--sp-5);
}

.hero-eyebrow::before {
    content: "";
    width: 28px;
    height: 1px;
    background: var(--border);
}

.hero-title {
    color: var(--text-primary);
    margin-bottom: var(--sp-4);
}

/* ---- Hero 标题打字机动画 ----
   无 JS / prefers-reduced-motion：光标不显示，标题完整呈现 */
.hero-title .type-caret {
    display: none;
}

.hero-title.is-typing .type-caret {
    display: inline-block;
    width: 3px;
    height: 0.78em;
    margin-left: 4px;
    vertical-align: -0.06em;
    background: var(--text-tertiary);
    border-radius: 1px;
    animation: gc-caret-blink 1.06s step-end infinite;
}

.hero-title .type-caret.is-solid {
    animation: none;
    opacity: 1;
}

.hero-title .type-caret.is-fade {
    opacity: 0;
    transition: opacity 0.5s var(--ease);
}

@keyframes gc-caret-blink {
    0%, 55% { opacity: 1; }
    56%, 100% { opacity: 0; }
}

/* 第三阶段：字符逐个弹出（scale 0.9→1 轻微回弹 + 上浮 + 淡入）*/
.hero-title .pop-char {
    display: inline-block;
    opacity: 0;
    animation: gc-pop-in 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes gc-pop-in {
    from {
        opacity: 0;
        transform: translateY(0.14em) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-title .type-caret {
        display: none !important;
    }

    .hero-title .pop-char {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

.hero-tagline {
    font-size: 16px;
    color: var(--text-secondary);
    margin: 0 0 var(--sp-2);
}

.hero-desc {
    font-size: 15px;
    color: var(--text-tertiary);
    margin: 0;
}

/* Hero 作者行：头像 + NTU17 + 一句话介绍 */
.hero-byline {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    margin-top: var(--sp-6);
}

.hero-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.hero-byline-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.hero-author {
    font-size: 14.5px;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: var(--text-primary);
}

.hero-bio {
    font-size: 13.5px;
    color: var(--text-tertiary);
}

.hero-actions {
    margin-top: var(--sp-5);
}

/* 作者联系方式链接（Hero 作者行内）*/
.author-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: var(--sp-2);
    font-size: 13.5px;
}

.author-links a {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color var(--dur-fast) var(--ease);
}

.author-links a:hover {
    color: var(--accent);
    text-decoration: none;
}

.author-links .sep {
    color: var(--border);
}

/* 邮箱悬停提示：完整地址 + 复制按钮 */
.contact-item {
    position: relative;
    display: inline-flex;
}

.contact-tip {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%) translateY(3px);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-2);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
    font-size: 12.5px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--dur-fast) var(--ease),
                transform var(--dur-fast) var(--ease),
                visibility var(--dur-fast) var(--ease);
    z-index: 50;
}

/* 透明桥：悬停从链接滑进气泡时不中断 */
.contact-tip::before {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 8px;
}

.contact-item:hover .contact-tip,
.contact-tip:focus-within {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.tip-email {
    font-family: var(--font-mono);
    letter-spacing: -0.01em;
}

.tip-copy {
    border: none;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 11.5px;
    line-height: 1.6;
    padding: 2px 8px;
    border-radius: var(--r-1);
    cursor: pointer;
    font-family: var(--font-ui);
    transition: background-color var(--dur-fast) var(--ease),
                color var(--dur-fast) var(--ease);
}

.tip-copy:hover {
    background: var(--accent);
    color: #fff;
}

/* ============ 回到顶部按钮 ============ */
.to-top {
    position: fixed;
    right: 28px;
    bottom: 28px;
    z-index: 90;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--surface-card);
    color: var(--text-secondary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(6px);
    transition: opacity var(--dur) var(--ease),
                visibility var(--dur) var(--ease),
                transform var(--dur) var(--ease),
                border-color var(--dur-fast) var(--ease),
                color var(--dur-fast) var(--ease);
}

.to-top.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.to-top:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* ============ 文章阅读进度条（仅文章页，2px 陶土色细线）============ */
.read-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 150;
    width: 0;
    height: 2px;
    background: var(--accent);
    pointer-events: none;
}

/* ============ 归档时间线（/archive 页面）============ */
.timeline {
    max-width: 760px;
    margin: 0 auto;
    padding: var(--sp-5) 0 var(--sp-8);
}

.tl-year {
    position: relative;
    padding-left: var(--sp-5);
    border-left: 1px solid var(--border-light);
}

.tl-year + .tl-year {
    margin-top: var(--sp-7);
}

.tl-year-title {
    position: relative;
    font-size: 34px;
    letter-spacing: -0.02em;
    margin-bottom: var(--sp-5);
}

/* 年份圆点：压在时间线上 */
.tl-year-title::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--sp-5) - 5.5px);
    top: 0.55em;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-primary);
    box-sizing: content-box;
}

.tl-month-group {
    position: relative;
    padding-bottom: var(--sp-5);
}

.tl-month {
    font-size: 13.5px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    margin-bottom: var(--sp-3);
}

.tl-post {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: var(--sp-3);
    padding: 7px 10px 7px 0;
    border-radius: var(--r-2);
    text-decoration: none;
    transition: background-color var(--dur-fast) var(--ease);
}

.tl-post:hover {
    background: var(--surface-hover);
    text-decoration: none;
}

/* 每篇文章的小圆点 */
.tl-post::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 0.95em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--border);
    transition: background-color var(--dur-fast) var(--ease);
}

.tl-post:hover::before {
    background: var(--accent);
}

.tl-day {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-tertiary);
    min-width: 1.6em;
}

.tl-title {
    font-family: var(--font-serif);
    font-size: 15.5px;
    color: var(--text-primary);
    line-height: 1.5;
    transition: color var(--dur-fast) var(--ease);
}

.tl-post:hover .tl-title {
    color: var(--accent);
}

.tl-meta {
    margin-left: auto;
    white-space: nowrap;
    font-size: 12.5px;
}

@media (max-width: 768px) {
    .tl-meta {
        display: none;
    }

    .tl-year-title {
        font-size: 28px;
    }
}

/* ============ 内容区通用 ============ */
.site-main {
    min-height: 55vh;
    padding-bottom: var(--sp-8);
}

/* 话题 pills 行 */
.topics {
    padding: var(--sp-6) 0 0;
    max-width: 760px;
    margin: 0 auto;
}

.topics-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-2);
}

/* 文章列表 */
.post-list-section {
    padding-top: var(--sp-7);
    max-width: 820px;
    margin: 0 auto;
}

.post-list-section .section-label {
    display: block;
    margin-bottom: var(--sp-2);
}

.post-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* ============ 文章详情（正文 + 右侧 TOC）============ */
.single-layout {
    display: grid;
    grid-template-columns: minmax(0, var(--content-max)) 216px;
    gap: var(--sp-7);
    justify-content: center;
    align-items: start;
}

.single-layout.no-toc {
    grid-template-columns: minmax(0, var(--content-max));
}

.toc-wrap {
    position: sticky;
    top: calc(var(--header-h) + var(--sp-6));
    display: none;
    max-height: calc(100vh - var(--header-h) - var(--sp-8));
    overflow-y: auto;
}

.has-toc .toc-wrap { display: block; }

/* ============ 归档/搜索头 ============ */
.archive-header {
    padding: var(--sp-7) var(--sp-3) var(--sp-5);
    max-width: 820px;
    margin: 0 auto;
}

.archive-header .section-label {
    display: block;
    margin-bottom: var(--sp-2);
}

.archive-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin: var(--sp-3) 0 0;
    max-width: 640px;
}

/* ============ 分页 ============ */
.pagination {
    max-width: 820px;
    margin: var(--sp-6) auto 0;
    display: flex;
    justify-content: center;
}

.pagination .nav-links {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
    flex-wrap: wrap;
}

.pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 6px;
    border-radius: var(--r-2);
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
}

.pagination a.page-numbers:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    text-decoration: none;
}

.pagination .page-numbers.current {
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 500;
}

/* ============ Footer ============ */
.site-footer {
    border-top: 1px solid var(--border-light);
    padding: var(--sp-6) 0;
    margin-top: var(--sp-8);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-4);
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-tertiary);
}

.footer-tagline {
    margin-left: var(--sp-3);
    padding-left: var(--sp-3);
    border-left: 1px solid var(--border-light);
}

.footer-inner a {
    color: var(--text-tertiary);
    text-decoration: none;
}

.footer-inner a:hover {
    color: var(--accent);
    text-decoration: none;
}

/* ============ 搜索弹窗 ============ */
.search-modal {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 12vh var(--sp-4) var(--sp-4);
}

.search-modal[hidden] { display: none; }

.search-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(40, 38, 33, 0.32);
    animation: gc-fade-in var(--dur-fast) var(--ease);
}

.search-modal-panel {
    position: relative;
    width: 100%;
    max-width: 560px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-4);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    animation: gc-fade-up var(--dur) var(--ease);
}

.search-input-row {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-4) var(--sp-4);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-tertiary);
}

.search-input-row input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: 16px;
    color: var(--text-primary);
    font-family: var(--font-ui);
}

.search-input-row input::placeholder {
    color: var(--text-tertiary);
}

.search-esc {
    font-size: 11px;
    color: var(--text-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--r-1);
    padding: 2px 6px;
    background: transparent;
    cursor: pointer;
    font-family: var(--font-ui);
    transition: background-color var(--dur-fast) var(--ease);
}

.search-esc:hover { background: var(--surface-hover); }

.search-results {
    max-height: 52vh;
    overflow-y: auto;
    padding: var(--sp-2);
}

.search-result {
    display: block;
    padding: var(--sp-3) var(--sp-3);
    border-radius: var(--r-2);
    text-decoration: none;
    transition: background-color var(--dur-fast) var(--ease);
}

.search-result:hover,
.search-result.is-active {
    background: var(--surface-hover);
    text-decoration: none;
}

.sr-title {
    font-family: var(--font-serif);
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.sr-excerpt {
    font-size: 13.5px;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 4px;
}

.sr-meta {
    font-size: 12.5px;
    color: var(--text-tertiary);
}

.search-empty,
.search-hints {
    padding: var(--sp-5) var(--sp-4);
    text-align: center;
    font-size: 14px;
    color: var(--text-tertiary);
}