:root {
    --paper: #f5efe2;
    --paper-strong: #ece2cf;
    --sand: #ddc8a3;
    --moss: #24453d;
    --moss-soft: #355a52;
    --ink: #16231f;
    --accent: #b66a3c;
    --accent-soft: #d88b58;
    --panel: rgba(250, 245, 236, 0.88);
    --panel-border: rgba(36, 69, 61, 0.14);
    --shadow: 0 22px 60px rgba(20, 32, 28, 0.14);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
    --content-width: min(1280px, calc(100vw - 32px));
    color-scheme: light;
}

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

[hidden] {
    display: none !important;
}

html {
    background:
        radial-gradient(circle at top left, rgba(214, 177, 111, 0.24), transparent 28%),
        radial-gradient(circle at top right, rgba(116, 154, 139, 0.18), transparent 26%),
        linear-gradient(180deg, #fbf7ef 0%, #f0e4d0 100%);
}

body {
    color: var(--ink);
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

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

button,
input,
textarea,
select {
    font: inherit;
}

a {
    color: inherit;
}

.page {
    min-height: 100vh;
}

.navbar {
    align-items: center;
    backdrop-filter: blur(18px);
    background: rgba(255, 251, 244, 0.78);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 24px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    margin: 18px auto 0;
    padding: 18px 24px;
    width: var(--content-width);
}

.navbar__actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: flex-end;
}

.logo {
    color: var(--moss);
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-decoration: none;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    list-style: none;
}

.nav-links a {
    border-radius: 999px;
    color: rgba(22, 35, 31, 0.78);
    padding: 10px 16px;
    text-decoration: none;
    transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
    background: rgba(36, 69, 61, 0.11);
    color: var(--moss);
    transform: translateY(-1px);
}

.locale-picker {
    align-items: center;
    display: inline-flex;
    gap: 10px;
}

.locale-picker__label {
    color: rgba(22, 35, 31, 0.72);
    font-size: 0.92rem;
}

.locale-picker__select {
    appearance: none;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(36, 69, 61, 0.16);
    border-radius: 999px;
    color: var(--moss);
    cursor: pointer;
    min-width: 144px;
    padding: 9px 14px;
}

.studio-layout,
.content-shell {
    margin: 22px auto 32px;
    width: var(--content-width);
}

.studio-layout {
    align-items: start;
    display: grid;
    gap: 20px;
    grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
    min-height: calc(100vh - 126px);
}

.panel,
.content-hero,
.info-card {
    backdrop-filter: blur(18px);
    background: var(--panel);
    border: 1px solid var(--panel-border);
    box-shadow: var(--shadow);
}

.panel {
    border-radius: var(--radius-xl);
    padding: 24px;
}

.panel--palette {
    display: grid;
    gap: 18px;
    grid-template-rows: auto auto minmax(0, 1fr);
    min-height: 0;
}

.panel--canvas {
    align-content: start;
    align-self: start;
    display: grid;
    gap: 16px;
    grid-template-rows: auto auto auto;
    min-height: 0;
}

.panel__eyebrow {
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.panel__title {
    font-family: "Georgia", "Times New Roman", serif;
    font-size: clamp(1rem, 2vw, 1.8rem);
    letter-spacing: -0.03em;
    line-height: 1.05;
}

.panel__title--compact {
    font-size: clamp(1.5rem, 2.3vw, 2rem);
    line-height: 1.15;
    white-space: normal;
}

.panel__lead {
    color: rgba(22, 35, 31, 0.74);
    max-width: 56ch;
}

/* 增加关于页面标题与段落的垂直间距，缓解排版过密 */
.panel__title {
    margin: 0 0 12px 0;
}

.panel__lead {
    margin: 0 0 18px 0;
    line-height: 1.8;
}

.about-timeline .panel__title {
    margin-top: 12px;
}

.asset-palette {
    align-content: start;
    display: grid;
    gap: 18px;
    min-height: 0;
    overflow: auto;
    padding-right: 4px;
}

.asset-browser {
    align-content: start;
    display: grid;
    gap: 18px;
}

.asset-browser__folders,
.asset-browser__content,
.folder-section {
    display: grid;
    gap: 12px;
}

.asset-browser__header,
.folder-section__header {
    display: grid;
    gap: 4px;
}

.asset-browser__title,
.folder-section__title,
.panel-section__title {
    font-size: 1rem;
}

.asset-browser__hint,
.folder-card__count,
.asset-browser__empty {
    color: rgba(22, 35, 31, 0.62);
    font-size: 0.9rem;
}

.background-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.background-card {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(244, 235, 219, 0.94));
    border: 1px solid rgba(36, 69, 61, 0.12);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: grid;
    gap: 10px;
    padding: 10px;
    text-align: left;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.background-card:hover:enabled,
.background-card.is-active {
    border-color: rgba(182, 106, 60, 0.34);
    box-shadow: 0 18px 30px rgba(182, 106, 60, 0.14);
    transform: translateY(-2px);
}

.background-card:disabled {
    cursor: progress;
    opacity: 0.72;
}

.background-card__preview {
    aspect-ratio: 3 / 4;
    border-radius: 16px;
    object-fit: cover;
    width: 100%;
}

.background-card__title {
    font-size: 0.92rem;
}

.folder-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
}

.folder-card {
    align-content: start;
    background: linear-gradient(180deg, rgba(255, 250, 241, 0.92), rgba(243, 233, 214, 0.92));
    border: 1px solid rgba(36, 69, 61, 0.12);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: grid;
    gap: 8px;
    justify-items: start;
    min-height: 112px;
    padding: 14px;
    text-align: left;
    transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.folder-card:hover,
.folder-card.is-active {
    border-color: rgba(182, 106, 60, 0.34);
    box-shadow: 0 18px 32px rgba(182, 106, 60, 0.12);
    transform: translateY(-2px);
}

.folder-card__icon {
    background: linear-gradient(180deg, #dbb878, #d4a95c);
    border-radius: 10px;
    display: inline-flex;
    height: 30px;
    position: relative;
    width: 46px;
}

.folder-card__icon::before {
    background: #e6c78f;
    border-radius: 8px 8px 0 0;
    content: '';
    height: 10px;
    left: 4px;
    position: absolute;
    top: -4px;
    width: 18px;
}

.folder-card__title {
    font-size: 0.96rem;
}

.asset-grid {
    display: grid;
    gap: 12px;
}

.panel-section {
    display: grid;
    gap: 10px;
}

.panel-section__header {
    align-items: center;
    display: flex;
    justify-content: space-between;
}

.panel-section--layers {
    min-height: 0;
}

.layer-list {
    display: grid;
    gap: 8px;
    max-height: 260px;
    min-height: 92px;
    overflow: auto;
}

.layer-list--empty {
    align-items: center;
    color: rgba(22, 35, 31, 0.56);
    display: flex;
    min-height: 92px;
}

.layer-item {
    align-items: center;
    background: rgba(255, 255, 255, 0.66);
    border: 1px solid rgba(36, 69, 61, 0.12);
    border-radius: var(--radius-md);
    cursor: grab;
    display: grid;
    gap: 10px;
    grid-template-columns: auto minmax(0, 1fr);
    padding: 12px 14px;
    text-align: left;
    transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.layer-item:hover {
    border-color: rgba(36, 69, 61, 0.28);
    transform: translateY(-1px);
}

.layer-item.is-active {
    background: rgba(36, 69, 61, 0.12);
    border-color: rgba(36, 69, 61, 0.38);
}

.layer-item.is-drop-target {
    box-shadow: inset 0 0 0 2px rgba(182, 106, 60, 0.42);
}

.layer-item__handle {
    color: rgba(22, 35, 31, 0.45);
    font-size: 1rem;
    letter-spacing: 0.12em;
}

.layer-item__label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.asset-card {
    align-items: center;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(247, 239, 225, 0.92));
    border: 1px solid rgba(36, 69, 61, 0.12);
    border-radius: var(--radius-lg);
    cursor: grab;
    display: grid;
    gap: 14px;
    grid-template-columns: 84px minmax(0, 1fr);
    padding: 14px;
    text-align: left;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.asset-card:hover {
    border-color: rgba(182, 106, 60, 0.36);
    box-shadow: 0 18px 30px rgba(182, 106, 60, 0.14);
    transform: translateY(-3px);
}

.asset-card__preview {
    aspect-ratio: 1;
    min-height: 84px;
    object-fit: contain;
    width: 100%;
}

.asset-card__meta {
    display: grid;
    min-width: 0;
}

.asset-card__title {
    font-size: 0.96rem;
}

.toolbar {
    align-content: start;
    align-items: start;
    background: rgba(255, 252, 246, 0.78);
    border: 1px solid rgba(36, 69, 61, 0.1);
    border-radius: var(--radius-lg);
    display: grid;
    gap: 12px;
    justify-items: stretch;
    justify-self: stretch;
    max-width: none;
    padding: 16px;
    width: 100%;
}

.toolbar__group {
    align-items: flex-start;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    width: 100%;
}

.toolbar__group--selection,
.toolbar__group--crop,
.toolbar__group--system {
    justify-content: flex-start;
}

.toolbar__meta {
    align-items: center;
    display: flex;
    min-height: 42px;
    width: 100%;
}

.toolbar button {
    align-items: center;
    background: var(--moss);
    border: none;
    border-radius: 999px;
    color: #f7f2e8;
    cursor: pointer;
    display: inline-flex;
    justify-content: center;
    padding: 10px 14px;
    transition: transform 180ms ease, opacity 180ms ease, background-color 180ms ease;
}

.toolbar button:hover:enabled {
    background: var(--moss-soft);
    transform: translateY(-1px);
}

.toolbar button:disabled {
    cursor: not-allowed;
    opacity: 0.42;
}

.toolbar__ghost {
    background: rgba(36, 69, 61, 0.08) !important;
    color: var(--moss) !important;
}

.toolbar__accent {
    background: var(--accent) !important;
    color: #fff7ef !important;
}

.toolbar__accent:hover:enabled {
    background: var(--accent-soft) !important;
}

.toolbar__selection {
    align-items: center;
    color: rgba(22, 35, 31, 0.72);
    display: flex;
    min-height: 42px;
    width: 100%;
}

.stage-frame {
    background:
        radial-gradient(circle at top, rgba(214, 177, 111, 0.12), transparent 35%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(236, 226, 207, 0.78));
    border: 1px solid rgba(36, 69, 61, 0.1);
    border-radius: calc(var(--radius-xl) + 4px);
    display: grid;
    min-height: clamp(440px, 70vh, 880px);
    overflow: hidden;
    padding: 18px;
    place-items: center;
    position: relative;
}

/* 背景加载覆盖层 */
.bg-loader {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 12px;
    background: linear-gradient(180deg, rgba(255,255,255,0.6), rgba(240,236,225,0.6));
    z-index: 40;
    pointer-events: none;
    opacity: 0;
    transition: opacity 240ms ease;
}

.bg-loader.is-loading {
    pointer-events: all;
    opacity: 1;
}

.bg-spinner {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 4px solid rgba(36,69,61,0.12);
    border-top-color: rgba(36,69,61,0.84);
    animation: bg-spin 1s linear infinite;
}

@keyframes bg-spin {
    to { transform: rotate(360deg); }
}

.bg-message {
    color: rgba(22,35,31,0.8);
    font-size: 0.95rem;
}

.stage-frame.is-drop-target {
    box-shadow: inset 0 0 0 2px rgba(182, 106, 60, 0.45);
}

.stage-host {
    background:
        linear-gradient(135deg, rgba(245, 239, 226, 0.92), rgba(255, 250, 243, 0.7)),
        linear-gradient(0deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.18));
    border-radius: calc(var(--radius-xl) - 2px);
    height: auto;
    max-height: 100%;
    max-width: 100%;
    min-height: 0;
    min-width: 0;
    overflow: hidden;
    width: auto;
}

.stage-host canvas {
    border-radius: inherit;
}

.stage-host.is-cropping {
    box-shadow: inset 0 0 0 2px rgba(182, 106, 60, 0.28);
}

.status-bar {
    color: rgba(22, 35, 31, 0.72);
    min-height: 24px;
    padding: 0 4px;
}

.content-shell {
    display: grid;
    gap: 22px;
}

.content-hero {
    border-radius: var(--radius-xl);
    padding: 30px;
}

.info-grid {
    display: grid;
    gap: 18px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.info-card {
    border-radius: var(--radius-lg);
    display: grid;
    gap: 10px;
    padding: 22px;
}

.info-card h2 {
    font-size: 1.02rem;
}

.info-card p {
    color: rgba(22, 35, 31, 0.7);
}

@media (max-width: 1024px) {
    .studio-layout {
        grid-template-columns: 1fr;
    }

    .layer-list {
        max-height: 220px;
    }
}

@media (max-width: 720px) {
    .navbar {
        align-items: flex-start;
        flex-direction: column;
        gap: 14px;
    }

    .navbar__actions,
    .locale-picker,
    .locale-picker__select {
        width: 100%;
    }

    .panel,
    .content-hero,
    .info-card {
        border-radius: 22px;
    }

    .panel__title--compact {
        font-size: 1.4rem;
    }

    .toolbar {
        width: 100%;
    }

    .toolbar__group,
    .toolbar__meta {
        width: 100%;
    }

    .toolbar__group {
        display: grid;
        gap: 10px;
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }

    .toolbar button,
    .toolbar__selection {
        width: 100%;
    }

    .folder-grid {
        grid-template-columns: 1fr 1fr;
    }

    .background-grid {
        grid-template-columns: 1fr 1fr;
    }

    .stage-frame {
        min-height: 360px;
        padding: 12px;
    }
}