/* 全局设计变量：集中维护颜色、字体、阴影和背景层。 */
:root {
    --bg: #050505;
    --panel: rgba(14, 14, 14, 0.8);
    --panel-soft: rgba(18, 9, 9, 0.58);
    --line: rgba(255, 255, 255, 0.12);
    --line-strong: rgba(225, 92, 92, 0.34);
    --text: #f5eaea;
    --muted: rgba(245, 234, 234, 0.72);
    --accent: #d52a31;
    --accent-soft: rgba(213, 42, 49, 0.14);
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.4);
    --max-width: 1260px;
    --bg-layer-a: linear-gradient(130deg, rgba(122, 12, 12, 0.28), rgba(0, 0, 0, 0.94) 56%);
    --bg-layer-b: linear-gradient(0deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    --bg-layer-c: linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    --bg-size-b: 42px 42px;
    --bg-size-c: 42px 42px;
    --hero-title: Georgia, "Times New Roman", "Songti SC", serif;
    --body-font: "Avenir Next", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    font-family: var(--body-font);
    background: var(--bg);
    position: relative;
    isolation: isolate;
    overflow-x: hidden;
}

/* 双层固定背景：
 * `site-bg-grid` 负责几何氛围层，
 * `site-bg-image` 负责插画底图和暗色遮罩。
 *
 * 这里不再依赖 `body::after + CSS 变量` 注入背景图，
 * 改成真实 DOM 节点，兼容性会更稳，也更容易排查样式层级问题。
 */
.site-bg-grid,
.site-bg-image {
    position: fixed;
    inset: 0;
    pointer-events: none;
}

.site-bg-grid {
    z-index: 0;
    background-image: var(--bg-layer-a), var(--bg-layer-b), var(--bg-layer-c);
    background-size: auto, var(--bg-size-b), var(--bg-size-c);
    background-position: center, center, center;
}

.site-bg-image {
    z-index: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.8;
    filter: saturate(0.92) contrast(1.05);
}

body[data-theme="stage"] {
    --bg-layer-a: linear-gradient(130deg, rgba(120, 12, 12, 0.32), rgba(0, 0, 0, 0.94) 50%);
}

body[data-theme="archive"] {
    --bg-layer-a: linear-gradient(140deg, rgba(54, 7, 7, 0.96), rgba(150, 28, 28, 0.24));
    --bg-layer-b: linear-gradient(0deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
    --bg-layer-c: linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
    --bg-size-b: 28px 28px;
    --bg-size-c: 28px 28px;
}

body[data-theme="signal"] {
    --bg-layer-a: linear-gradient(116deg, rgba(0, 0, 0, 0.92), rgba(168, 22, 22, 0.18) 48%, rgba(0, 0, 0, 0.96));
    --bg-layer-b: linear-gradient(0deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    --bg-layer-c: linear-gradient(90deg, rgba(255, 255, 255, 0.058) 1px, transparent 1px);
    --bg-size-b: 52px 52px;
    --bg-size-c: 320px 320px;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    display: block;
    width: 100%;
}

.site-shell {
    width: min(var(--max-width), calc(100% - 32px));
    margin: 0 auto;
}

.topbar,
.site-shell {
    position: relative;
    z-index: 1;
}

/* 顶部导航与品牌信息。 */
.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(16px);
    background: rgba(8, 8, 8, 0.78);
    border-bottom: 1px solid var(--line);
}

.topbar-inner {
    width: min(var(--max-width), calc(100% - 32px));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
}

.brand {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.brand strong {
    font-size: 0.92rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.brand span {
    color: var(--muted);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
}

.header-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
}

.chip,
.ghost-button,
.solid-button {
    appearance: none;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
    font: inherit;
    cursor: pointer;
    transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.chip {
    padding: 10px 14px;
}

.ghost-button,
.solid-button {
    padding: 12px 18px;
}

.solid-button {
    background: linear-gradient(135deg, rgba(182, 34, 34, 0.96), rgba(110, 8, 8, 0.96));
    border-color: rgba(255, 106, 106, 0.4);
    box-shadow: 0 10px 28px rgba(120, 0, 0, 0.24);
}

.chip:hover,
.ghost-button:hover,
.solid-button:hover {
    transform: translateY(-1px);
    border-color: var(--line-strong);
    background: rgba(217, 48, 54, 0.12);
}

/* 首页与详情页共用的 Hero 区。 */
.hero {
    padding: 64px 0 28px;
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.95fr);
    gap: 34px;
    align-items: start;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.84rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 18px 0 14px;
    font-family: var(--hero-title);
    font-size: clamp(2.9rem, 7vw, 5.5rem);
    line-height: 0.96;
    font-weight: 600;
}

.hero h1 span {
    display: block;
    color: #ffb7b7;
}

.hero p.lead,
.world-intro,
.side-block li,
.side-block p,
.section-head p,
.album-copy p,
.message-item p,
.field-note,
.empty-state,
.world-copy p {
    color: var(--muted);
    line-height: 1.8;
}

.hero-actions-main {
    margin-top: 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-meta {
    margin-top: 28px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.metric {
    padding: 18px 0;
    border-top: 1px solid var(--line);
}

.metric strong {
    display: block;
    margin-bottom: 6px;
    font-size: 2rem;
    font-family: var(--hero-title);
    font-weight: 600;
}

.metric span {
    color: var(--muted);
    font-size: 0.94rem;
}

.side-info,
.world-copy,
.world-hero-visual,
.guestbook-form,
.message-stream {
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(17, 10, 10, 0.8), rgba(6, 6, 6, 0.5));
    box-shadow: var(--shadow);
}

.side-info,
.world-copy,
.guestbook-form {
    padding: 26px;
}

.side-block + .side-block {
    margin-top: 22px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
}

.profile-avatar-frame {
    width: 132px;
    aspect-ratio: 1;
    margin-bottom: 16px;
    padding: 7px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 8px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(213, 42, 49, 0.08));
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.28);
}

.profile-avatar {
    width: 100%;
    height: 100%;
    border-radius: 6px;
    object-fit: cover;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.side-block h2,
.section-head h2 {
    margin: 0 0 10px;
    font-size: 1rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.contact-list,
.profile-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.contact-list a {
    color: #ffd0d0;
}

/* 页面主分区样式。 */
.section {
    padding: 28px 0 34px;
    border-top: 1px solid var(--line);
}

.section-head {
    display: flex;
    flex-wrap: wrap;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 22px;
}

.section-head p {
    margin: 0;
    max-width: 680px;
}

/* 相册卡片区。 */
.album-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.album-card {
    display: block;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.album-card:hover {
    transform: translateY(-4px);
    border-color: var(--line-strong);
    background: rgba(18, 12, 12, 0.92);
}

.album-stack {
    position: relative;
    aspect-ratio: 4 / 5;
    padding: 26px;
    overflow: hidden;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 30%),
        linear-gradient(135deg, rgba(114, 14, 14, 0.16), rgba(0, 0, 0, 0.5));
}

.album-photo {
    position: absolute;
    inset: auto;
    width: calc(100% - 58px);
    height: calc(100% - 58px);
    top: 28px;
    left: 28px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    overflow: hidden;
    background: #101010;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.34);
    transform:
        translate(
            calc(var(--stack-index) * 8px),
            calc(var(--stack-index) * 7px)
        )
        rotate(calc((var(--stack-index) - 2) * 1.8deg));
    z-index: calc(6 + var(--stack-index));
}

.album-photo img {
    height: 100%;
    object-fit: cover;
}

.album-overlay {
    position: absolute;
    inset: auto 18px 18px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    background: rgba(6, 6, 6, 0.74);
    backdrop-filter: blur(10px);
    z-index: 14;
}

.album-overlay strong {
    font-size: 0.95rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.album-overlay span {
    color: var(--muted);
    font-size: 0.82rem;
}

.album-copy {
    padding: 18px 18px 20px;
}

.album-copy h3,
.world-copy h2,
.message-item h3,
.image-copy h3 {
    margin: 0 0 10px;
    font-size: 1.18rem;
    font-weight: 600;
}

.album-copy p,
.world-copy p,
.message-item p,
.image-copy p {
    margin: 0;
}

.album-meta,
.image-meta,
.message-meta,
.music-state {
    margin-top: 10px;
    color: rgba(245, 234, 234, 0.56);
    font-size: 0.84rem;
}

/* 详情页图文与 Tab 切换。 */
.detail-layout {
    display: grid;
    grid-template-columns: minmax(320px, 0.86fr) minmax(0, 1.14fr);
    gap: 24px;
    align-items: start;
}

.world-hero-visual {
    padding: 18px;
}

.world-hero-visual figure {
    margin: 0;
    aspect-ratio: 4 / 5;
    overflow: hidden;
    border-radius: 8px;
    background: #0c0c0c;
}

.world-hero-visual img,
.image-card img {
    height: 100%;
    object-fit: cover;
}

.detail-copy-stack {
    display: grid;
    gap: 18px;
}

.detail-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
}

.tab-button {
    appearance: none;
    min-height: 40px;
    padding: 0 16px;
    border: 1px solid transparent;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    font: inherit;
    cursor: pointer;
    transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.tab-button.active {
    color: var(--text);
    background: rgba(213, 42, 49, 0.14);
    border-color: rgba(255, 122, 122, 0.2);
}

.tab-panel[hidden] {
    display: none;
}

.tab-panel-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.world-card {
    padding: 24px;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(17, 10, 10, 0.8), rgba(6, 6, 6, 0.5));
    box-shadow: var(--shadow);
}

.world-intro h1,
.world-intro h2,
.world-intro h3,
.world-intro h4,
.world-intro h5,
.world-intro h6 {
    margin: 0 0 12px;
    color: var(--text);
    line-height: 1.25;
}

.world-intro p,
.world-intro ul,
.world-intro ol,
.world-intro blockquote,
.world-intro pre {
    margin: 0 0 14px;
}

.world-intro ul,
.world-intro ol {
    padding-left: 22px;
}

.world-intro li + li {
    margin-top: 6px;
}

.world-intro a {
    color: #ffd0d0;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.world-intro code {
    padding: 2px 6px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.08);
    font-size: 0.92em;
}

.world-intro pre {
    overflow-x: auto;
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
}

.world-intro pre code {
    padding: 0;
    background: transparent;
}

.world-intro blockquote {
    padding-left: 14px;
    border-left: 2px solid rgba(255, 122, 122, 0.35);
    color: rgba(245, 234, 234, 0.64);
}

/* 图片网格与详情卡片。 */
.image-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.image-card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.image-card figure {
    margin: 0;
    aspect-ratio: 4 / 5;
    overflow: hidden;
    background: #101010;
}

.image-copy {
    padding: 15px 15px 16px;
}

.image-open {
    margin-top: 14px;
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
}

/* 留言表单与消息流。 */
.guestbook-layout {
    display: grid;
    grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
    gap: 24px;
    align-items: start;
}

.field-grid {
    display: grid;
    gap: 14px;
}

.field label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--muted);
}

.field input,
.field textarea,
.field select {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    font: inherit;
}

.field textarea {
    min-height: 170px;
    resize: vertical;
}

.hidden-field {
    position: absolute;
    left: -9999px;
    opacity: 0;
    pointer-events: none;
}

.flash {
    margin-bottom: 16px;
    padding: 14px 15px;
    border-radius: 8px;
    border: 1px solid var(--line);
}

.flash.success {
    background: rgba(42, 88, 42, 0.26);
    border-color: rgba(100, 186, 100, 0.28);
}

.flash.error {
    background: rgba(110, 20, 20, 0.24);
    border-color: rgba(221, 80, 80, 0.28);
}

.message-stream {
    display: grid;
    gap: 1px;
    background: var(--line);
}

.message-item,
.empty-state {
    background: rgba(10, 10, 10, 0.88);
    padding: 18px 20px;
}

.message-topline {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

.message-badge {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 12px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: #ffd9d9;
    border: 1px solid rgba(255, 98, 98, 0.22);
    font-size: 0.84rem;
}

.empty-state strong {
    display: block;
    margin-bottom: 10px;
    color: var(--text);
    font-size: 1rem;
}

.footer {
    padding: 18px 0 42px;
    color: rgba(245, 234, 234, 0.56);
    font-size: 0.88rem;
    text-align: center;
}

/* 响应式收口：保持当前桌面风格的同时兼容平板与手机。 */
@media (max-width: 1120px) {
    .album-grid,
    .image-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .hero,
    .detail-layout,
    .guestbook-layout {
        grid-template-columns: 1fr;
    }

    .tab-panel-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .site-shell,
    .topbar-inner {
        width: min(calc(100% - 20px), var(--max-width));
    }

    .hero {
        padding-top: 40px;
        gap: 28px;
    }

    .hero h1 {
        font-size: clamp(2.45rem, 14vw, 4rem);
    }

    .hero-meta {
        grid-template-columns: 1fr;
    }

    .album-grid,
    .image-grid {
        grid-template-columns: 1fr;
    }

    .header-actions {
        width: 100%;
        justify-content: flex-start;
    }
}