:root {
    --bg-base: #f4f6f4;
    --bg-accent: #dde8ef;
    --panel-bg: #ffffff;
    --ink: #1f2a30;
    --muted: #5f6f77;
    --line: #d6e0e4;
    --tab-idle: #edf3f5;
    --tab-active: #0f766e;
    --tab-active-ink: #f6fbfa;
    --danger-bg: #fff2ef;
    --danger-ink: #a64628;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    --radius: 14px;
    --code-bg: #ecf3f2;
    --input-bg: #ffffff;
    --upload-bg: linear-gradient(135deg, #f4f9fa, #f8f6f0);
    --upload-hover: linear-gradient(135deg, #eaf2f4, #f3eedf);
    --upload-border: #9ab1bc;
    --upload-border-hover: #7d9ba8;
    --empty-icon-bg: #edf3f5;
    --empty-icon-color: #7d9ba8;
    --empty-bg: linear-gradient(135deg, #fdfefe, #f8fbfc);
    --th-bg: #f2f7f8;
    --file-summary: #295465;
}

[data-theme="dark"] {
    --bg-base: #0f172a;
    --bg-accent: #1e293b;
    --panel-bg: #1e293b;
    --ink: #f8fafc;
    --muted: #94a3b8;
    --line: #334155;
    --tab-idle: #334155;
    --tab-active: #38bdf8;
    --tab-active-ink: #0f172a;
    --danger-bg: #451a1a;
    --danger-ink: #fca5a5;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --code-bg: #334155;
    --input-bg: #0f172a;
    --upload-bg: linear-gradient(135deg, #1e293b, #0f172a);
    --upload-hover: linear-gradient(135deg, #334155, #1e293b);
    --upload-border: #475569;
    --upload-border-hover: #94a3b8;
    --empty-icon-bg: #334155;
    --empty-icon-color: #94a3b8;
    --empty-bg: linear-gradient(135deg, #1e293b, #0f172a);
    --th-bg: #0f172a;
    --file-summary: #38bdf8;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: "Space Grotesk", system-ui, sans-serif;
    color: var(--ink);
    background: var(--bg-base);
    padding: 1.2rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.background-shape {
    display: none;
}

.app-shell {
    width: min(1150px, 100%);
    margin: 0 auto;
    display: grid;
    gap: 1rem;
}

.panel {
    background: var(--panel-bg);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1rem 1.1rem;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.hero {
    animation: fade-slide 360ms ease;
}

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

.theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--muted);
    padding: 0.5rem;
    border-radius: 50%;
    display: inline-flex;
    transition: background-color 0.2s, color 0.2s;
}

.theme-toggle:hover {
    background-color: var(--tab-idle);
    color: var(--ink);
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

.hero-kicker {
    margin: 0;
    text-transform: uppercase;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--muted);
}

.hero h1 {
    margin: 0.25rem 0 0.55rem;
    font-size: clamp(1.5rem, 2.6vw, 2.2rem);
    color: var(--ink);
}

.hero p {
    margin: 0;
    color: var(--muted);
    line-height: 1.45;
}

.hero code,
.upload-trigger code {
    font-family: "IBM Plex Mono", monospace;
    padding: 0.08rem 0.25rem;
    border-radius: 6px;
    background: var(--code-bg);
    color: var(--ink);
}

.controls h2,
.uploader h2 {
    margin: 0 0 0.8rem;
    font-size: 1rem;
    color: var(--ink);
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 0.75rem;
}

.control-field {
    display: grid;
    gap: 0.4rem;
}

.control-field span,
.control-check span {
    color: var(--muted);
    font-size: 0.9rem;
}

.control-field input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.5rem 0.55rem;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--ink);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.control-check {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.75rem;
    cursor: pointer;
}

.control-check.is-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.control-check.is-disabled input {
    cursor: not-allowed;
}

.control-check input {
    inline-size: 1.05rem;
    block-size: 1.05rem;
}

.upload-trigger {
    cursor: pointer;
    display: grid;
    gap: 0.3rem;
    border: 1px dashed var(--upload-border);
    border-radius: 12px;
    padding: 0.9rem;
    background: var(--upload-bg);
    transition: background 180ms ease, border-color 180ms ease;
}

.upload-trigger:hover,
.upload-trigger.is-dragover {
    background: var(--upload-hover);
    border-color: var(--upload-border-hover);
}

.upload-trigger span {
    font-weight: 600;
    color: var(--ink);
}

.upload-trigger small {
    color: var(--muted);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.uploader-help {
    margin: 0.65rem 0 0.2rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.summary-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 2rem;
}

.file-summary {
    margin: 0;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.88rem;
    color: var(--file-summary);
}

.clear-button {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.6rem;
    border: 1px solid var(--danger-ink);
    border-radius: 6px;
    background: var(--danger-bg);
    color: var(--danger-ink);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 150ms ease, opacity 150ms ease;
}

.clear-button[hidden] {
    display: none !important;
}

.clear-button:hover {
    filter: brightness(0.95);
}

.clear-button:focus-visible {
    outline: 2px solid var(--danger-ink);
    outline-offset: 2px;
}

.clear-button.is-confirming {
    background: var(--danger-ink);
    color: #ffffff;
    border-color: var(--danger-ink);
}

.clear-button.is-confirming:hover {
    filter: brightness(0.85);
}

.tab-controls {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.tab-button {
    border: 0;
    border-radius: 10px;
    padding: 0.55rem 0.85rem;
    background: var(--tab-idle);
    color: var(--ink);
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    transition: transform 120ms ease, background-color 180ms ease, color 180ms ease;
}

.tab-button:hover {
    transform: translateY(-1px);
}

.tab-button.is-active {
    background: var(--tab-active);
    color: var(--tab-active-ink);
}

.tab-button:focus-visible,
.control-field input:focus-visible,
.control-check input:focus-visible,
.table-wrapper:focus-visible,
.tab-panel:focus-visible {
    outline: 2px solid var(--tab-active);
    outline-offset: 2px;
}

#residual-files:focus-visible+.upload-trigger {
    outline: 2px solid var(--tab-active);
    outline-offset: 2px;
}

.tab-panel {
    display: none;
    animation: fade-slide 240ms ease;
}

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

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 0.8rem;
    padding: 3rem 1rem;
    border: 2px dashed var(--line);
    border-radius: var(--radius);
    background: var(--empty-bg);
    color: var(--muted);
}

.empty-state p {
    margin: 0;
    font-size: 0.95rem;
}

.empty-state-icon {
    display: inline-flex;
    padding: 0.8rem;
    border-radius: 50%;
    background: var(--empty-icon-bg);
    color: var(--empty-icon-color);
}

.empty-state-icon svg {
    width: 28px;
    height: 28px;
}

.result-card {
    padding: 0.8rem 0 0.25rem;
    border-top: 1px solid var(--line);
}

.result-card:first-child {
    border-top: 0;
    padding-top: 0;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.7rem;
    min-height: 1.5rem;
}

.result-card h3 {
    margin: 0;
    font-size: 0.96rem;
    font-family: "IBM Plex Mono", monospace;
    color: var(--ink);
}

.export-toolbar {
    display: flex;
    gap: 0.5rem;
}

.export-btn {
    background: var(--input-bg);
    border: 1px solid var(--line);
    color: var(--ink);
    border-radius: 6px;
    padding: 0.2rem 0.6rem;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.export-btn:hover {
    background: var(--tab-idle);
    border-color: var(--muted);
}

.plot-host {
    width: 100%;
    min-height: 330px;
}

.plot-host.static {
    overflow-x: auto;
}

.error-message {
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 0.7rem;
    border-radius: 10px;
    border: 1px solid var(--danger-ink);
    background: var(--danger-bg);
    color: var(--danger-ink);
}

.error-message span {
    display: inline-flex;
}

.table-wrapper {
    overflow: auto;
    max-height: 70vh;
    border: 1px solid var(--line);
    border-radius: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.8rem;
}

th,
td {
    border-bottom: 1px solid var(--line);
    padding: 0.35rem 0.45rem;
    text-align: right;
    white-space: nowrap;
}

th:first-child,
td:first-child {
    text-align: left;
}

th {
    position: sticky;
    top: 0;
    background: var(--th-bg);
    z-index: 1;
}

tbody tr:hover {
    background-color: var(--tab-idle);
}

noscript {
    display: block;
    margin: 1rem auto 0;
    width: min(1150px, 100%);
    padding: 0.75rem 0.9rem;
    border-radius: 10px;
    border: 1px solid var(--danger-ink);
    background: var(--danger-bg);
    color: var(--danger-ink);
}

.app-footer {
    width: min(1150px, 100%);
    margin: 2rem auto 1rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
    animation: fade-slide 360ms ease;
}

.app-footer p {
    margin: 1rem 0 0;
    display: flex;
    justify-content: center;
}

.app-footer a {
    color: var(--ink);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.app-footer a:hover {
    color: var(--tab-active);
}

.contributors-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.contributor-bubble {
    display: inline-flex;
    border-radius: 50%;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contributor-bubble:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow);
    z-index: 10;
}

.contributor-bubble img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--panel-bg);
    background: var(--panel-bg);
    object-fit: cover;
}

@keyframes fade-slide {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 740px) {
    body {
        padding: 0.8rem;
    }

    .panel {
        padding: 0.9rem;
    }

    .control-check {
        margin-top: 0;
    }

    .plot-host {
        min-height: 280px;
    }
}