:root {
    color-scheme: light;
    --bg: #f4f6fb;
    --panel: #ffffff;
    --panel-light: #f8f9fd;
    --text: #1f2933;
    --muted: #6b7280;
    --accent: #2563eb;
    --border: #d6dbe5;
    --success: #16a34a;
}

:root[data-theme='dark'] {
    color-scheme: dark;
    --bg: #0b1120;
    --panel: #0b1120;
    --panel-light: #111827;
    --text: #f8fafc;
    --muted: #cbd5f5;
    --accent: #60a5fa;
    --border: #2b3445;
    --success: #22c55e;
}

body.theme-dark {
    color-scheme: dark;
    --bg: #0b1120;
    --panel: #0b1120;
    --panel-light: #111827;
    --text: #f8fafc;
    --muted: #cbd5f5;
    --accent: #60a5fa;
    --border: #2b3445;
    --success: #22c55e;
}

* {
    box-sizing: border-box;
}

html,
body,
.app {
    height: 100%;
    overflow: hidden;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
}

.app {
    display: grid;
    grid-template-columns: minmax(280px, 480px) minmax(0, 1fr);
}

.sidebar {
    padding: 28px;
    background: var(--panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: 480px;
    min-width: 280px;
    flex-shrink: 0;
    height: 100%;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.section-divider {
    width: 100%;
    border: none;
    border-top: 1px solid var(--border);
    margin: 4px 0;
}

.sidebar__header h1 {
    margin: 0;
    font-size: 20px;
}

.sidebar__header p {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.panel {
    background: var(--panel);
    border-radius: 12px;
    border: 1px solid var(--border);
    border-left: 3px solid rgba(37, 99, 235, 0.4);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
    overflow: hidden;
    transition: background 0.2s ease;
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.panel h2 {
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

#data-upload .panel-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.panel-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 16px;
    background: var(--panel-light);
}

.panel__summary {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    padding: 14px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.panel__summary span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.panel__summary-meta {
    font-size: 12px;
    font-weight: 500;
    color: var(--muted);
}

.panel i[data-lucide],
.panel__summary i[data-lucide] {
    width: 16px;
    height: 16px;
}

.panel--static .panel__summary {
    border-bottom: 1px solid var(--border);
}

details.panel > summary.panel__summary {
    list-style: none;
    cursor: pointer;
}

details.panel {
    padding: 0;
}

details.panel > summary.panel__summary::-webkit-details-marker {
    display: none;
}

details.panel > summary.panel__summary::after {
    content: '▸';
    font-size: 14px;
    color: var(--muted);
    transition: transform 0.2s ease;
}

details.panel[open] > summary.panel__summary::after {
    transform: rotate(90deg);
}

details.panel[open] > summary.panel__summary {
    border-bottom: 1px solid var(--border);
}

details.panel[open] {
    border-color: rgba(37, 99, 235, 0.45);
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.12);
}

details.panel .panel-body {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.25s ease, opacity 0.2s ease;
}

details.panel:not([open]) .panel-body {
    padding-top: 0;
    padding-bottom: 0;
}

details.panel[open] .panel-body {
    max-height: 2000px;
    opacity: 1;
}

.axis-accordion {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sub-panel {
    border-left: 2px solid rgba(37, 99, 235, 0.25);
    background: var(--panel-light);
}

.sub-panel .panel-body {
    background: var(--panel);
}

.detail-fields {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.detail-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 8px;
    padding: 4px 0;
}

.panel__subtitle {
    margin: 6px 0 0;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--muted);
}

.dropzone {
    border: 1px dashed var(--border);
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    position: relative;
    background: rgba(255, 255, 255, 0.02);
}

.dropzone input {
    opacity: 0;
    position: absolute;
    inset: 0;
    cursor: pointer;
}

label {
    display: flex;
    flex-direction: column;
    font-size: 13px;
    gap: 6px;
}

input[type="text"],
input[type="number"],
select {
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 10px;
    border-radius: 8px;
}

body.theme-dark input[type="text"],
body.theme-dark input[type="number"],
body.theme-dark select {
    background: #0b1220;
    border-color: #2f3b52;
    color: var(--text);
}

input[type="range"] {
    width: 100%;
}

button {
    background: var(--accent);
    border: none;
    color: #fff;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

button.ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

button.primary {
    background: var(--success);
}

body.theme-dark button {
    background: #1d4ed8;
    color: #f8fafc;
}

body.theme-dark button.primary {
    background: #15803d;
}

body.theme-dark button.ghost {
    background: #0b1120;
    border-color: #334155;
    color: var(--text);
}

.row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.row.wrap {
    flex-wrap: wrap;
}

.row label {
    flex: 1;
}

.input-with-unit {
    display: flex;
    gap: 6px;
}

.input-with-unit input,
.input-with-unit select {
    flex: 1;
}

.checkbox {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.checkbox input {
    width: auto;
}

.panel-body input,
.panel-body select,
.panel-body button {
    margin-bottom: 0;
}

.helper-text {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
}

#project-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 180px;
    overflow-y: auto;
}

#project-list li {
    padding: 8px 10px;
    background: var(--panel);
    border-radius: 8px;
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    font-size: 13px;
}

#project-list button {
    padding: 6px 8px;
    font-size: 12px;
}

.canvas {
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow: auto;
    height: 100%;
    overscroll-behavior: contain;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chart-header span {
    color: var(--muted);
    font-size: 14px;
}

#chart {
    background: var(--panel);
    border-radius: 16px;
    border: 1px solid var(--border);
    align-self: flex-start;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

#chart.is-editing {
    border-color: rgba(37, 99, 235, 0.6);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2), 0 18px 32px rgba(30, 64, 175, 0.25);
}

.series-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
}

.series-row input[type="color"] {
    border: none;
    background: transparent;
}

.style-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.value-label-settings {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 12px;
    border-radius: 12px;
    border: 1px dashed var(--border);
    background: var(--panel-light);
}

.value-label-settings.is-hidden {
    display: none;
}

.floating-editor {
    position: fixed;
    z-index: 40;
    width: 220px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.15);
    display: none;
}

.floating-editor__close {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--panel-light);
    color: var(--text);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
}

.floating-editor__close:hover {
    background: rgba(37, 99, 235, 0.12);
}

.floating-editor.is-visible {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

@media (max-width: 960px) {
    .app {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
    }

    .sidebar {
        max-width: none;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
}

.style-group.is-hidden {
    display: none;
}

.is-hidden {
    display: none;
}

@media (max-width: 980px) {
    .app {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
        width: 100%;
    }
}

@media (max-width: 640px) {
    .row {
        flex-direction: column;
    }
}