:root {
    --gv-bg: #f6f1e8;
    --gv-surface: #fffdf8;
    --gv-surface-strong: #fff8eb;
    --gv-border: #ddc9a3;
    --gv-border-strong: #c98d3a;
    --gv-text: #23180f;
    --gv-muted: #6c5a48;
    --gv-accent: #a23d28;
    --gv-accent-dark: #7c2513;
    --gv-accent-soft: #f3ded2;
    --gv-success: #165b33;
    --gv-error: #9f1c1c;
    --gv-shadow: 0 20px 60px rgba(66, 38, 11, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(201, 141, 58, 0.18), transparent 32%),
        linear-gradient(160deg, #f9f5ec 0%, #f3ebdc 45%, #efe3cd 100%);
    color: var(--gv-text);
    font-family: Georgia, "Times New Roman", serif;
}

.gv-page {
    width: min(1180px, calc(100vw - 2rem));
    margin: 2rem auto 3rem;
    display: grid;
    gap: 1.5rem;
}

.gv-hero,
.gv-dropzone-wrap,
.gv-summary,
.gv-tabs-section {
    background: var(--gv-surface);
    border: 1px solid var(--gv-border);
    border-radius: 24px;
    box-shadow: var(--gv-shadow);
}

.gv-hero {
    padding: 1.6rem 1.8rem;
}

.gv-eyebrow {
    margin: 0 0 0.5rem;
    color: var(--gv-accent);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.82rem;
    font-weight: 700;
}

.gv-hero h1 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 0.98;
}

.gv-intro {
    margin: 1rem 0 0;
    max-width: 70ch;
    color: var(--gv-muted);
    font-size: 1.05rem;
}

.gv-dropzone-wrap {
    padding: 1.5rem;
    display: grid;
    gap: 1rem;
}


.gv-direct-import {
    display: grid;
    gap: 0.9rem;
    padding: 1rem;
    border: 1px solid rgba(201, 141, 58, 0.35);
    border-radius: 18px;
    background: var(--gv-surface-strong);
}

.gv-direct-import__head h2 {
    margin: 0;
    font-size: 1.2rem;
}

.gv-direct-import__head p {
    margin: 0.35rem 0 0;
    color: var(--gv-muted);
}

.gv-direct-import__controls {
    display: grid;
    gap: 0.6rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: end;
}

.gv-direct-import__controls .gv-button {
    width: fit-content;
}

@media (max-width: 760px) {
    .gv-direct-import__controls {
        grid-template-columns: 1fr;
    }
}

.gv-saved-picker {
    display: grid;
    gap: 0.45rem;
}

.gv-saved-picker__label {
    font-size: 0.92rem;
    color: var(--gv-muted);
    font-weight: 700;
}

.gv-saved-picker__select {
    width: min(520px, 100%);
    min-height: 48px;
    padding: 0.7rem 0.95rem;
    border-radius: 14px;
    border: 1px solid var(--gv-border);
    background: #fff;
    color: var(--gv-text);
    font: inherit;
}

.gv-dropzone {
    display: grid;
    gap: 0.4rem;
    place-items: center;
    min-height: 220px;
    padding: 1.5rem;
    border: 2px dashed var(--gv-border-strong);
    border-radius: 22px;
    background:
        linear-gradient(135deg, rgba(255, 248, 235, 0.98), rgba(243, 222, 210, 0.86)),
        repeating-linear-gradient(45deg, transparent, transparent 16px, rgba(162, 61, 40, 0.04) 16px, rgba(162, 61, 40, 0.04) 32px);
    cursor: pointer;
    transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.gv-dropzone:hover,
.gv-dropzone.is-dragging {
    transform: translateY(-1px);
    border-color: var(--gv-accent);
    box-shadow: inset 0 0 0 1px rgba(162, 61, 40, 0.14);
}

.gv-dropzone__title {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 700;
    text-align: center;
}

.gv-dropzone__hint {
    color: var(--gv-muted);
    text-align: center;
    max-width: 48ch;
}

.gv-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.gv-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0.7rem 1.2rem;
    border-radius: 999px;
    border: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
}

.gv-button--primary {
    background: var(--gv-accent);
    color: #fff;
}

.gv-button--primary:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.gv-button--ghost {
    border-color: var(--gv-border);
    color: var(--gv-text);
    background: #fff;
}

.gv-status {
    min-height: 1.4rem;
    margin: 0;
    color: var(--gv-muted);
}

.gv-status[data-state="error"] {
    color: var(--gv-error);
}

.gv-summary {
    padding: 1rem;
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gv-summary__card {
    padding: 1rem;
    background: var(--gv-surface-strong);
    border-radius: 18px;
    border: 1px solid rgba(201, 141, 58, 0.35);
    display: grid;
    gap: 0.35rem;
}

.gv-summary__label {
    color: var(--gv-muted);
    font-size: 0.92rem;
}

.gv-tabs-section {
    overflow: hidden;
}

.gv-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 1rem 1rem 0;
}

.gv-tab {
    border: 1px solid var(--gv-border);
    background: transparent;
    color: var(--gv-text);
    padding: 0.7rem 1rem;
    border-radius: 999px;
    cursor: pointer;
    font: inherit;
}

.gv-tab.is-active {
    background: var(--gv-text);
    border-color: var(--gv-text);
    color: #fff;
}

.gv-tab--accent {
    border-color: var(--gv-accent);
    color: var(--gv-accent);
}

.gv-panels {
    padding: 1rem;
}

.gv-panel {
    display: none;
}

.gv-panel.is-active {
    display: block;
}

.gv-header-sheet,
.gv-sheet-panel,
.gv-structured {
    display: grid;
    gap: 1rem;
}

.gv-header-sheet h2,
.gv-sheet-panel h2,
.gv-structured h2 {
    margin: 0;
    font-size: 1.8rem;
}

.gv-header-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.gv-header-grid article {
    padding: 1rem;
    border-radius: 18px;
    background: var(--gv-surface-strong);
    border: 1px solid rgba(201, 141, 58, 0.35);
}

.gv-header-grid h3,
.gv-tree-section h3,
.gv-tree-competition h4,
.gv-tree-subsection h4 {
    margin: 0 0 0.7rem;
}

.gv-header-grid ul,
.gv-tree-subsection ul {
    margin: 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 0.5rem;
}

.gv-table-wrap {
    overflow: auto;
    border-radius: 18px;
    border: 1px solid var(--gv-border);
}

.gv-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

.gv-table td {
    border-bottom: 1px solid #eee1c8;
    border-right: 1px solid #eee1c8;
    padding: 0.55rem 0.7rem;
    vertical-align: top;
    white-space: nowrap;
}

.gv-sheet-panel__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.gv-sheet-panel__head p,
.gv-structured__intro p,
.gv-empty,
summary {
    margin: 0;
    color: var(--gv-muted);
}

.gv-tree-section {
    display: grid;
    gap: 0.85rem;
}

.gv-tree-competition {
    display: grid;
    gap: 0.85rem;
}

.gv-tree-root,
.gv-tree-children {
    list-style: none;
    margin: 0;
    padding-left: 0;
}

.gv-tree-root {
    display: grid;
    gap: 0.25rem;
}

.gv-workspace {
    display: grid;
    grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
}

.gv-workspace__tree {
    min-width: 0;
}

.gv-preview {
    min-width: 0;
    border-left: 1px solid rgba(201, 141, 58, 0.35);
    padding-left: 1.25rem;
}

.gv-preview__inner {
    min-height: 480px;
}

.gv-preview__head h3 {
    margin: 0;
    font-size: 1.2rem;
}

.gv-preview__head p {
    margin: 0.35rem 0 1rem;
}

.gv-preview__body {
    display: grid;
    gap: 0.9rem;
    line-height: 1.45;
}

.gv-preview__body table {
    width: 100%;
    border-collapse: collapse;
}

.gv-preview__body td,
.gv-preview__body th {
    border: 1px solid #e7d8bc;
    padding: 0.45rem 0.55rem;
    vertical-align: top;
}

.gv-preview__body img {
    max-width: 100%;
    height: auto;
}

.gv-tree-children {
    display: none;
    margin-left: 1rem;
    padding-top: 0.15rem;
}

.gv-accordion-item.is-open > .gv-tree-children {
    display: block;
}

.gv-tree-node,
.gv-tree-leaf {
    margin: 0;
}

.gv-tree-toggle {
    position: relative;
    width: 100%;
    border: 0;
    background: transparent;
    color: var(--gv-text);
    font: inherit;
    text-align: left;
    padding: 0.16rem 0.25rem 0.16rem 1rem;
    cursor: pointer;
}

.gv-tree-toggle::before {
    content: "";
    position: absolute;
    left: 0.2rem;
    top: 0.58rem;
    width: 0;
    height: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 6px solid #262626;
    transform-origin: 35% 50%;
    transition: transform 140ms ease;
}

.gv-accordion-item.is-open > .gv-tree-toggle::before {
    transform: rotate(90deg);
}

.gv-tree-toggle--major {
    font-weight: 700;
}

.gv-tree-toggle--class {
    color: #1d39c4;
    font-weight: 700;
}

.gv-tree-toggle.is-selected {
    color: #1d39c4;
    font-weight: 700;
}

.gv-tree-leaf a,
.gv-tree-leaf span {
    display: block;
    padding: 0.14rem 0.25rem 0.14rem 1rem;
    color: #1d39c4;
    text-decoration: none;
}

.gv-preview-link.is-selected {
    color: #1d39c4;
    font-weight: 700;
}

.gv-tree-leaf a:hover {
    text-decoration: underline;
}

.gv-hidden {
    display: none !important;
}

@media (max-width: 820px) {
    .gv-page {
        width: min(100vw - 1rem, 1180px);
        margin-top: 1rem;
    }

    .gv-summary,
    .gv-header-grid {
        grid-template-columns: 1fr;
    }

    .gv-workspace {
        grid-template-columns: 1fr;
    }

    .gv-preview {
        border-left: 0;
        border-top: 1px solid rgba(201, 141, 58, 0.35);
        padding-left: 0;
        padding-top: 1rem;
    }

    .gv-dropzone {
        min-height: 180px;
    }
}