/* 浅净版均衡三花用近白底色承载内容，只让橘、黑、绿出现在需要识别和操作的位置。 */
:root {
    --ink: #202421;
    --forest: #244038;
    --orange: #d9824d;
    --orange-dark: #a34e28;
    --paper: #f6f8f5;
    --hero-paper: #fbfaf7;
    --surface: #ffffff;
    --surface-soft: #f1f4f0;
    --sage: #b9c8c0;
    --muted: #5e6963;
    --line: #dce2dd;
    --line-strong: #b9c3bd;
    --error: #963a2b;
    --eye: #a89132;
    --focus-ring: rgba(168, 145, 50, 0.32);
    --content: 1120px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-width: 320px;
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.7;
}

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

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

a:focus-visible {
    outline: 3px solid var(--eye);
    outline-offset: 4px;
}

.skip-link {
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 20;
    padding: 8px 12px;
    color: #ffffff;
    background: var(--ink);
    transform: translateY(-180%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(calc(100% - 48px), var(--content));
    min-height: 78px;
    margin: 0 auto;
    border-bottom: 1px solid var(--line);
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    font-size: 18px;
    font-weight: 800;
}

.site-brand img {
    width: 40px;
    height: 40px;
    border: 2px solid var(--ink);
    border-radius: 50%;
    object-fit: cover;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

.site-nav a {
    position: relative;
    padding: 10px 0;
    color: var(--muted);
    font-weight: 700;
}

.site-nav a::after {
    position: absolute;
    right: 0;
    bottom: 4px;
    left: 0;
    height: 3px;
    background: var(--orange);
    content: "";
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
    color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* 首屏只承担品牌和主要动作，真实内容需要在常见笔记本视口内露出。 */
.intro {
    display: flex;
    align-items: center;
    min-height: min(500px, calc(100svh - 112px));
    background-color: var(--hero-paper);
    background-image: url("../images/assistant/calico-mascot.png");
    background-repeat: no-repeat;
    background-position: right 5vw bottom 18px;
    background-size: min(42vw, 590px) auto;
}

.intro-content {
    width: min(calc(100% - 48px), var(--content));
    margin: 0 auto;
    padding: 48px 52% 54px 0;
}

.intro h1 {
    max-width: 620px;
    margin: 0;
    font-family: Georgia, "Microsoft YaHei", serif;
    font-size: 58px;
    line-height: 1.06;
    letter-spacing: 0;
    white-space: nowrap;
}

.intro-copy {
    max-width: 570px;
    margin: 20px 0 0;
    color: var(--muted);
    font-size: 18px;
}

.intro-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 24px;
    margin-top: 28px;
}

.primary-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 10px 20px;
    color: #ffffff;
    background: var(--forest);
    border: 1px solid var(--forest);
    border-radius: 4px;
    font-weight: 750;
    transition: background 180ms ease, border-color 180ms ease;
}

.primary-link:hover {
    background: var(--orange-dark);
    border-color: var(--orange-dark);
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    border-bottom: 1px solid currentcolor;
    color: var(--orange-dark);
    font-weight: 750;
}

.text-link:hover {
    color: var(--forest);
}

.home-content {
    width: min(calc(100% - 48px), var(--content));
    margin: 0 auto;
    padding: 54px 0 88px;
}

.home-content-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 32px;
    margin-bottom: 24px;
}

.home-content-heading h2 {
    margin: 0;
    font-family: Georgia, "Microsoft YaHei", serif;
    font-size: 32px;
    line-height: 1.2;
    letter-spacing: 0;
}

.home-content-heading p {
    margin: 8px 0 0;
    color: var(--muted);
}

.section-link,
.panel-link,
.home-panel-heading > a,
.home-reading-links a {
    color: var(--orange-dark);
    font-weight: 750;
}

.section-link:hover,
.panel-link:hover,
.home-panel-heading > a:hover,
.home-reading-links a:hover {
    color: var(--forest);
}

/* 三个内容区共享一个边界，避免重新堆回互不关联的浮动卡片。 */
.home-content-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.25fr) minmax(0, 0.9fr);
    background: var(--surface);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.home-panel {
    min-width: 0;
    min-height: 262px;
    padding: 28px;
}

.home-panel + .home-panel {
    border-left: 1px solid var(--line);
}

.home-panel-label {
    margin: 0 0 12px;
    color: var(--orange-dark);
    font-size: 13px;
    font-weight: 850;
}

.home-panel h3 {
    margin: 0;
    font-family: Georgia, "Microsoft YaHei", serif;
    font-size: 25px;
    font-weight: 750;
    line-height: 1.3;
    letter-spacing: 0;
}

.home-panel > p:not(.home-panel-label) {
    margin: 16px 0 22px;
    color: var(--muted);
}

.home-project {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
}

.home-project .panel-link {
    margin-top: auto;
}

.home-panel-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
}

.home-panel-heading > a {
    flex: 0 0 auto;
    padding-top: 29px;
    font-size: 14px;
}

.home-link-list {
    margin-top: 18px;
}

.home-link-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 11px 0;
    border-top: 1px solid var(--line);
}

.home-link-list a:hover strong {
    color: var(--orange-dark);
}

.home-link-list strong,
.home-link-list small {
    display: block;
}

.home-link-list strong {
    transition: color 180ms ease;
}

.home-link-list small {
    margin-top: 2px;
    color: var(--muted);
    font-size: 12px;
}

.home-link-list a > span:last-child {
    color: var(--orange-dark);
}

.home-reading-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
    margin-top: 28px;
}

.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(calc(100% - 48px), var(--content));
    min-height: 112px;
    margin: 0 auto;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 14px;
}

.site-footer.has-site-version {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
}

.site-footer.has-site-version > :first-child {
    grid-column: 1;
    justify-self: start;
}

.site-footer.has-site-version > :nth-last-child(2) {
    grid-column: 3;
    justify-self: end;
}

.site-version {
    grid-column: 2;
    grid-row: 1;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.site-footer a:hover {
    color: var(--orange-dark);
}

/* 点心使用 224px 源帧缩放到 96px 视窗，保证小尺寸下仍有清晰细节。 */
.cat-assistant {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 40;
    width: 96px;
    height: 96px;
    padding: 0;
    overflow: hidden;
    appearance: none;
    background: transparent;
    border: 0;
    border-radius: 0;
    cursor: grab;
    filter: drop-shadow(0 12px 12px rgba(34, 37, 34, 0.2));
    touch-action: none;
    will-change: transform;
}

.cat-assistant:focus-visible {
    outline: 3px solid var(--eye);
    outline-offset: 2px;
}

.cat-assistant.is-dragging {
    cursor: grabbing;
}

.cat-assistant.is-paused {
    filter: drop-shadow(0 8px 9px rgba(34, 37, 34, 0.16)) saturate(0.72);
}

.cat-sprite {
    display: block;
    width: 96px;
    height: 96px;
    background-image: url("../images/assistant/dianshin-pose.png");
    background-repeat: no-repeat;
    background-position: var(--cat-frame-offset, 0) var(--cat-row-offset, 0);
    background-size: 384px 192px;
    transition: transform 160ms ease;
}

.cat-assistant[data-action="walk"] .cat-sprite {
    background-image: url("../images/assistant/dianshin-walk.png");
    background-size: 384px 768px;
}

.cat-assistant:hover .cat-sprite,
.cat-assistant:focus-visible .cat-sprite {
    transform: translateY(-2px);
}

@media (max-width: 920px) {
    .home-content-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .home-panel:last-child {
        grid-column: 1 / -1;
        min-height: 0;
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .intro-content {
        padding-right: 49%;
    }

    .intro h1 {
        font-size: 52px;
    }
}

@media (max-width: 700px) {
    .site-header {
        width: min(calc(100% - 32px), var(--content));
        min-height: 70px;
    }

    .site-brand span {
        display: none;
    }

    .site-brand img {
        width: 36px;
        height: 36px;
    }

    .site-nav {
        gap: 20px;
    }

    .intro {
        align-items: flex-start;
        min-height: 0;
        background-position: center bottom 28px;
        background-size: calc(100vw - 32px) auto;
    }

    .intro-content {
        width: min(calc(100% - 32px), var(--content));
        padding: 44px 0 270px;
    }

    .intro h1 {
        font-size: 46px;
        white-space: normal;
    }

    .intro-copy {
        max-width: 540px;
        font-size: 17px;
    }

    .home-content {
        width: min(calc(100% - 32px), var(--content));
        padding: 48px 0 68px;
    }

    .home-content-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
        margin-bottom: 20px;
    }

    .home-content-grid {
        grid-template-columns: 1fr;
    }

    .home-panel {
        min-height: 0;
        padding: 24px 0;
    }

    .home-panel + .home-panel,
    .home-panel:last-child {
        grid-column: auto;
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .site-footer {
        display: flex;
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        gap: 4px;
        width: min(calc(100% - 32px), var(--content));
        padding: 24px 0;
    }

    .site-footer.has-site-version {
        display: flex;
    }

    .site-footer p {
        margin: 0;
    }

    /* 窄屏已经展示完整主视觉，隐藏游走助手以免随机遮挡标题和操作。 */
    .cat-assistant {
        display: none;
    }
}

@media (max-width: 420px) {
    .intro-content {
        padding-bottom: 252px;
    }

    .intro-actions {
        gap: 18px;
    }

    .home-content-heading h2 {
        font-size: 29px;
    }
}

/* 五个导航项在最窄支持宽度下缩小间距，避免与品牌图标互相挤压。 */
@media (max-width: 360px) {
    body {
        /* 经典滚动条会占用视口宽度，继续强制 320px 会产生横向滚动。 */
        min-width: 0;
    }

    .site-nav {
        gap: 14px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }

    .cat-assistant:hover .cat-sprite,
    .cat-assistant:focus-visible .cat-sprite {
        transform: none;
    }
}