:root {
    --bg: #eef1f6;
    --bg-alt: #e3e8f1;
    --panel: #ffffff;
    --panel-alt: #f5f7fb;
    --card: #ffffff;
    --card-hover: #eef2fa;
    --border: #ccd3e0;
    --border-strong: #a9b3c8;
    --text: #16213a;
    --text-dim: #5b6a86;
    --accent: #1d3f78;
    --accent-strong: #122c58;
    --accent-soft: rgba(29, 63, 120, .09);
    --tab-bg: #ccd3dc;
    --warn: #8a5a00;
    --warn-bg: rgba(184, 122, 0, .1);
    --warn-border: rgba(184, 122, 0, .38);
    --danger: #ad2a22;
    --danger-bg: rgba(173, 42, 34, .1);
    --danger-border: rgba(173, 42, 34, .38);
    --radius-lg: 10px;
    --radius-md: 6px;
    --radius-sm: 4px;
    --shadow: 0 1px 2px rgba(20, 30, 60, .06), 0 10px 26px rgba(20, 30, 60, .07);
}

* {
    box-sizing: border-box
}

html {
    color-scheme: light
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 14px/1.5 "Segoe UI", "Inter", system-ui, Arial, sans-serif;
    -webkit-font-smoothing: antialiased
}

::selection {
    background: var(--accent);
    color: #fff
}

* {
    scrollbar-width: thin;
    scrollbar-color: #aab4c8 transparent
}

*::-webkit-scrollbar {
    width: 9px;
    height: 9px
}

*::-webkit-scrollbar-thumb {
    background: #aab4c8;
    border-radius: 99px
}

*::-webkit-scrollbar-thumb:hover {
    background: #8b96ae
}

main {
    max-width: 1360px;
    margin: auto;
    padding: 24px clamp(14px, 3vw, 28px) 48px
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 14px;
    padding: 4px 4px 20px;
    border-bottom: 3px solid var(--accent);
    margin-bottom: 24px
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px
}

.chapterTab {
    flex: none;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    color: #fff;
    font-weight: 800;
    font-style: italic;
    font-size: 20px;
    font-family: Georgia, "Times New Roman", serif;
    border-radius: 3px;
    box-shadow: 3px 3px 0 var(--tab-bg)
}

.kicker {
    margin: 0 0 2px;
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--text-dim)
}

h1 {
    font-size: clamp(19px, 2.4vw, 25px);
    margin: 0;
    letter-spacing: -.01em;
    color: var(--accent);
    font-weight: 800;
    font-style: italic
}

h2 {
    font-size: 14px;
    margin: 0 0 10px;
    padding-left: 10px;
    font-weight: 700;
    color: var(--text);
    border-left: 3px solid var(--accent)
}

#status {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: .02em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 99px
}

#status::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor
}

.upload {
    position: relative;
    border: 1.5px dashed var(--border-strong);
    border-radius: var(--radius-md);
    background: var(--panel);
    text-align: center;
    padding: clamp(16px, 3vw, 26px) 18px;
    margin-bottom: 16px;
    transition: border-color .15s ease, background .15s ease
}

.upload:hover {
    border-color: var(--accent)
}

.upload.dragging {
    border-color: var(--accent);
    background: var(--accent-soft)
}

.upload h2 {
    margin: 0 0 2px;
    border-left: 0;
    padding-left: 0
}

.upload p,
#caption {
    color: var(--text-dim);
    margin: 6px 0 12px;
    font-size: 13px
}

#caption {
    text-align: center;
    font-style: italic
}

.button,
button,
select,
input[type=number] {
    background: var(--panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--text);
    cursor: pointer;
    font: inherit;
    transition: background .12s ease, border-color .12s ease, transform .05s ease
}

select,
input[type=number] {
    cursor: default;
    width: 100%
}

button:hover,
.button:hover {
    background: var(--card-hover);
    border-color: var(--accent)
}

button:active,
.button:active {
    transform: translateY(1px)
}

button:focus-visible,
.button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 1px
}

button:disabled,
.button:disabled {
    opacity: .45;
    cursor: not-allowed;
    transform: none
}

#pack {
    width: 100%;
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 700;
    padding: 12px 14px;
    margin: 4px 0 12px
}

#pack:hover:not(:disabled) {
    background: var(--accent-strong);
    border-color: var(--accent-strong)
}

.button.ghost {
    background: transparent
}

.button.link {
    background: none;
    border: 0;
    padding: 4px 6px;
    color: var(--text-dim);
    font-size: 12px;
    text-decoration: underline;
    text-underline-offset: 2px
}

.button.link:hover {
    color: var(--accent);
    background: none
}

.btnRow {
    display: flex;
    gap: 8px;
    flex-wrap: wrap
}

.btnRow .button {
    flex: 1 1 auto
}

.workspace {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 18px;
    align-items: start
}

.controls {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    padding: 16px;
    position: sticky;
    top: 16px;
    max-height: calc(100vh - 32px);
    overflow-y: auto
}

label {
    display: grid;
    gap: 6px;
    margin-bottom: 12px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-dim)
}

.facts {
    font-size: 12px;
    color: var(--text-dim);
    margin: -4px 0 16px;
    line-height: 1.6;
    padding: 8px 10px;
    background: var(--panel-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm)
}

.facts:empty {
    display: none
}

.listHead {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px
}

.sheetList {
    max-height: 320px;
    overflow-y: auto;
    margin-bottom: 4px;
    padding-right: 2px;
    border-top: 1px solid var(--border)
}

article {
    position: relative;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    padding: 10px 34px 10px 12px;
    margin: 0;
    line-height: 1.55;
    font-size: 12.5px;
    border-left: 3px solid transparent;
    transition: background .12s ease, border-color .12s ease
}

article:hover {
    background: var(--accent-soft);
    border-left-color: var(--accent)
}

article b {
    font-size: 13px
}

.remove {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 22px;
    height: 22px;
    padding: 0;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-dim);
    font-size: 15px
}

.remove:hover {
    background: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger)
}

#unplacedList h2 {
    margin-top: 4px
}

.orderGroup {
    background: var(--panel-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    margin-bottom: 8px;
    font-size: 12.5px
}

.orderGroup b {
    display: block;
    margin-bottom: 4px;
    font-size: 11.5px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: .04em
}

.unplacedItem {
    padding: 2px 0
}

.warning {
    color: var(--warn);
    font-size: 12px;
    font-weight: 600
}

#uploadErrors:not(:empty) {
    margin-top: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    background: var(--warn-bg);
    border: 1px solid var(--warn-border);
    text-align: left;
    font-size: 12px
}

#violations:not(:empty) {
    display: block;
    margin-top: 8px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    background: var(--warn-bg);
    border: 1px solid var(--warn-border)
}

#result:empty {
    display: none
}

#result {
    background: var(--panel-alt);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font: 12.5px/1.6 "Courier New", monospace;
    white-space: pre-wrap;
    margin: 4px 0
}

#scene {
    width: 100%;
    height: 620px;
    background: radial-gradient(120% 100% at 50% 0%, #eef2f9, #dde4f0);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    overflow: hidden
}

.viewer {
    position: relative
}

.packviewGrid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 12px;
    margin-bottom: 12px
}

.sceneWrap {
    position: relative
}

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

.topviewHead {
    padding: 6px 10px;
    font-size: 11px;
    font-style: italic;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
    background: var(--panel-alt)
}

#topScene {
    flex: 1;
    min-height: 260px;
    background: radial-gradient(120% 100% at 50% 0%, #eef2f9, #dde4f0)
}

.infoBar {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    padding: 9px 14px;
    margin-bottom: 12px;
    font-size: 12px;
    color: var(--text-dim)
}

.infoBar b {
    color: var(--accent);
    font-weight: 700
}

.infoBar .infoItem:not(:last-child) {
    border-right: 1px solid var(--border);
    padding-right: 14px
}

.detailPanel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    margin-bottom: 12px;
    overflow: hidden
}

.detailHead {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    background: var(--panel-alt)
}

.detailHead span {
    font-size: 12.5px;
    font-weight: 700;
    color: var(--text)
}

.sideToggle {
    display: flex;
    gap: 2px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 99px;
    padding: 2px;
    flex: none
}

.sideToggle button {
    border: 0;
    background: transparent;
    padding: 4px 12px;
    border-radius: 99px;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--text-dim)
}

.sideToggle button:hover {
    background: var(--accent-soft)
}

.sideToggle button.active {
    background: var(--accent);
    color: #fff
}

.detailTableWrap {
    max-height: 240px;
    overflow-y: auto
}

#detailTable {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px
}

#detailTable thead th {
    position: sticky;
    top: 0;
    background: var(--panel-alt);
    text-align: left;
    padding: 7px 10px;
    font-weight: 700;
    color: var(--text);
    border-bottom: 1px solid var(--border-strong);
    white-space: nowrap
}

#detailTable tbody td {
    padding: 6px 10px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    white-space: nowrap
}

#detailTable tbody tr:hover {
    background: var(--accent-soft)
}

#detailTable tbody tr.rowEmpty td {
    color: var(--text-dim);
    font-style: italic;
    text-align: center;
    padding: 18px;
    white-space: normal
}

.setDot {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: middle
}

.views {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 2;
    display: flex;
    gap: 4px;
    background: rgba(255, 255, 255, .85);
    backdrop-filter: blur(6px);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow)
}

.views button {
    border-radius: 3px;
    padding: 7px 13px;
    font-size: 12.5px;
    background: transparent;
    border-color: transparent;
    color: var(--text-dim)
}

.views button:hover {
    background: var(--accent-soft);
    color: var(--text)
}

.views button.active {
    background: var(--accent);
    color: #fff;
    font-weight: 600
}

canvas {
    display: block
}

@media(max-width:1024px) {
    .workspace {
        grid-template-columns: 300px 1fr
    }

    #scene {
        height: 540px
    }

    .packviewGrid {
        grid-template-columns: 1fr
    }

    #topScene {
        min-height: 220px
    }
}

@media(max-width:840px) {
    .workspace {
        grid-template-columns: 1fr
    }

    .controls {
        position: static;
        max-height: none
    }

    .sheetList {
        max-height: 260px
    }

    #scene {
        height: 460px
    }
}

@media(max-width:520px) {
    main {
        padding: 14px 12px 32px
    }

    header {
        padding-bottom: 14px;
        margin-bottom: 14px
    }

    .chapterTab {
        width: 34px;
        height: 34px;
        font-size: 17px
    }

    .upload {
        padding: 16px 12px
    }

    .views {
        left: 8px;
        top: 8px;
        gap: 4px;
        padding: 4px
    }

    .views button {
        padding: 6px 9px;
        font-size: 11.5px
    }

    #scene {
        height: 380px;
        border-radius: var(--radius-md)
    }

    .btnRow {
        flex-direction: column
    }
}