:root {
    --color-bg: #f4f4f4;
    --color-surface: #fff;
    --color-text: #111;
    --color-border: #ddd;
    --color-border-strong: #ccc;
    --color-ink: #000;
    --radius: 4px;
    --shadow-panel: 0 4px 8px rgba(0, 0, 0, 0.08);
    --control-height: 38px;
    --gap: 16px;
    --preview-frame-height-reserve: 300px;
    --preview-frame-max-height: 900px;
}

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

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
}

body.strip-editor {
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding: clamp(10px, 2vw, 20px);
    width: 100%;
}

:where(button, input, select, textarea) {
    font: inherit;
}

:where(fieldset, menu) {
    border: 0;
    margin: 0;
    min-width: 0;
    padding: 0;
}

menu {
    list-style: none;
}

legend {
    color: var(--color-text);
    font-size: 15px;
    font-weight: 700;
    margin-block-end: 12px;
    padding: 0;
}

[hidden] {
    display: none !important;
}

.visually-hidden {
    block-size: 1px;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    inline-size: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
}

.site-header {
    background: var(--color-ink);
    box-shadow: var(--shadow-panel);
    color: var(--color-surface);
    padding: clamp(14px, 2vw, 16px) clamp(12px, 3vw, 20px);
    text-align: center;
}

.site-header h1 {
    font-size: clamp(24px, 5vw, 28px);
    line-height: 1.1;
    margin: 0;
}

.strip-editor-shell {
    display: flex;
    flex-direction: column;
    gap: var(--gap);
    margin-inline: auto;
    max-width: 1280px;
    width: 100%;
}

.editor-workspace {
    align-items: start;
    display: grid;
    gap: var(--gap);
    grid-template-columns: minmax(0, 1fr) 360px;
}

:where(.preview-pane, .customization-pane) {
    background: var(--color-surface);
    border-radius: 8px;
    box-shadow: var(--shadow-panel);
    min-width: 0;
    padding: clamp(14px, 2vw, 18px);
}

.customization-pane {
    display: flex;
    flex-direction: column;
    gap: 18px;
    position: sticky;
    top: 20px;
}

.pane-heading {
    align-items: start;
    display: flex;
    gap: 12px;
    justify-content: space-between;
    margin-block-end: var(--gap);
}

.pane-heading h2 {
    font-size: 20px;
    line-height: 1.2;
    margin: 0;
}

.strip-preview-stage {
    align-items: start;
    background: var(--color-bg);
    display: flex;
    justify-content: center;
    min-height: min(560px, calc(100dvh - 220px));
    overflow: auto;
    padding: clamp(14px, 2vw, 20px);
}

.strip-preview {
    margin: 0;
}

.strip-preview figcaption {
    color: #333;
    font-size: 14px;
    line-height: 1.2;
    margin: 0 0 10px;
    text-align: center;
}

.strip-svg-frame {
    aspect-ratio: var(--strip-aspect-ratio);
    background: var(--color-surface);
    height: clamp(320px, calc(100dvh - var(--preview-frame-height-reserve)), var(--preview-frame-max-height));
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.16);
    outline: 2px solid var(--color-ink);
    position: relative;
    width: auto;
}

.strip-svg-frame.is-wide {
    --preview-frame-max-height: 960px;
}

.strip-svg-frame svg {
    cursor: grab;
    display: block;
    height: 100%;
    inset: 0;
    position: absolute;
    touch-action: none;
    width: 100%;
}

.strip-svg-frame svg:active {
    cursor: grabbing;
}

.strip-svg-frame [data-decoration-id] {
    cursor: move;
}

:where(.segmented-control, .strip-side-selector, .button-row) {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

:where(.segmented-control, .strip-side-selector) legend {
    flex-basis: 100%;
}

:where(.segmented-control, .strip-side-selector) label {
    cursor: pointer;
    margin: 0;
}

:where(.segmented-control, .strip-side-selector) input {
    block-size: 1px;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    inline-size: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
}

:where(.segmented-control, .strip-side-selector) span {
    align-items: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius);
    color: #333;
    display: inline-flex;
    font-size: 14px;
    font-weight: 700;
    min-height: var(--control-height);
    padding: 10px 12px;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

:where(.segmented-control, .strip-side-selector) input:checked + span {
    background: var(--color-ink);
    border-color: var(--color-ink);
    color: var(--color-surface);
}

:where(.segmented-control, .strip-side-selector) input:focus-visible + span,
:where(button, input):focus-visible {
    outline: 2px solid #555;
    outline-offset: 2px;
}

.preview-mode-control {
    flex: 0 0 auto;
    justify-content: flex-end;
}

.preview-mode-control span {
    font-size: 12px;
    min-height: 32px;
    padding: 8px 10px;
    text-transform: uppercase;
}

.control-group {
    border-top: 1px solid #e0e0e0;
    padding-block-start: 18px;
}

.control-group label {
    color: #333;
    display: flex;
    flex-direction: column;
    font-size: 13px;
    font-weight: 700;
    gap: 6px;
}

.control-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-block-start: 14px;
}

[data-background-controls] [data-background-panel] {
    display: none;
}

[data-background-controls]:has(input[value="solid"]:checked) [data-background-panel="solid"],
[data-background-controls]:has(input[value="gradient"]:checked) [data-background-panel="gradient"],
[data-background-controls]:has(input[value="image"]:checked) [data-background-panel="image"] {
    display: grid;
}

:where(input[type="color"], input[type="file"], input[type="number"], input[type="range"]) {
    width: 100%;
}

:where(input[type="color"], input[type="file"], input[type="number"]) {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    min-height: var(--control-height);
    padding: 8px;
}

input[type="color"] {
    padding: 4px;
}

input[type="file"] {
    color: #333;
    font-size: 13px;
}

.file-picker {
    cursor: pointer;
    position: relative;
}

.file-picker input[type="file"] {
    block-size: var(--control-height);
    cursor: pointer;
    inline-size: 100%;
    inset-block-end: 0;
    inset-inline: 0;
    opacity: 0;
    padding: 0;
    position: absolute;
}

.file-picker-button {
    align-items: center;
    background: var(--color-ink);
    border: 1px solid var(--color-ink);
    border-radius: var(--radius);
    color: var(--color-surface);
    display: inline-flex;
    font-size: 13px;
    font-weight: 700;
    justify-content: center;
    min-height: var(--control-height);
    padding: 8px 12px;
    width: 100%;
}

.file-picker:hover .file-picker-button {
    background: #333;
}

.file-picker input[type="file"]:focus-visible + .file-picker-button {
    outline: 2px solid #555;
    outline-offset: 2px;
}

input[type="range"] {
    accent-color: var(--color-ink);
}

input:disabled {
    background: #eee;
    color: #777;
    cursor: not-allowed;
}

button {
    background: var(--color-ink);
    border: 0;
    border-radius: var(--radius);
    color: var(--color-surface);
    cursor: pointer;
    font-weight: 700;
    padding: 10px 14px;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

button:hover:not(:disabled) {
    background: #333;
}

button:active:not(:disabled) {
    transform: scale(0.98);
}

button:disabled {
    background: var(--color-border);
    color: #777;
    cursor: not-allowed;
}

.selected-decoration-file {
    align-items: center;
    background: var(--color-bg);
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius);
    color: #666;
    display: flex;
    font-size: 13px;
    font-weight: 700;
    gap: 10px;
    justify-content: space-between;
    line-height: 1.4;
    margin: 12px 0 0;
    min-height: 44px;
    padding: 6px 6px 6px 12px;
}

.selected-decoration-file [data-selected-decoration-file-name] {
    min-width: 0;
    overflow-wrap: anywhere;
}

.selected-decoration-file.is-missing-asset {
    border-color: #a96b00;
    color: #5c3b00;
}

.selected-decoration-file.is-empty {
    color: #777;
    font-weight: 400;
}

.selected-decoration-remove-button {
    align-items: center;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius);
    color: #b00020;
    display: inline-flex;
    flex: 0 0 auto;
    font-size: 18px;
    font-weight: 900;
    height: 32px;
    justify-content: center;
    line-height: 1;
    padding: 0;
    width: 32px;
}

.selected-decoration-remove-button:hover:not(:disabled) {
    background: #ffe8ed;
    border-color: #e3a1ad;
    color: #7a0016;
}

.selected-decoration-remove-button:disabled {
    background: transparent;
}

.selected-decoration-remove-button svg {
    display: block;
    fill: currentColor;
}

.scale-button-control,
.rotation-button-control {
    color: #333;
    display: flex;
    flex-direction: column;
    font-size: 13px;
    font-weight: 700;
    gap: 6px;
}

.scale-button-row,
.rotation-button-row {
    display: grid;
    gap: 8px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.scale-button,
.rotation-button {
    align-items: center;
    display: inline-flex;
    justify-content: center;
    min-height: var(--control-height);
    padding: 0;
}

.scale-button svg,
.rotation-button svg {
    display: block;
    fill: currentColor;
}

.draft-notice,
.draft-status {
    background: #fff7df;
    border: 1px solid #d8ad42;
    border-radius: var(--radius);
    color: #4c3500;
    font-size: 13px;
    line-height: 1.4;
    margin: 0 0 12px;
    padding: 10px 12px;
}

.draft-notice {
    align-items: center;
    display: flex;
    gap: 10px;
    justify-content: space-between;
}

.draft-status {
    display: block;
}

.draft-notice-dismiss-button {
    background: transparent;
    border: 1px solid #d8ad42;
    color: #4c3500;
    flex: 0 0 auto;
    padding: 6px 8px;
}

.draft-notice-dismiss-button:hover:not(:disabled) {
    background: #ffe7aa;
}

[data-draft-controls] .button-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

[data-draft-controls] .button-row li {
    display: flex;
    min-width: 0;
}

[data-draft-controls] .button-row button {
    min-height: 44px;
    width: 100%;
}

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

    .customization-pane {
        position: static;
    }

    .strip-svg-frame {
        height: auto;
        width: clamp(170px, 40vw, 260px);
    }

    .strip-svg-frame.is-wide {
        height: auto;
        width: min(86vw, 560px);
    }
}

@media (max-width: 600px) {
    .pane-heading {
        align-items: stretch;
        flex-direction: column;
    }

    .strip-preview-stage {
        justify-content: flex-start;
        min-height: auto;
    }

    .strip-svg-frame {
        height: auto;
        width: min(72vw, 240px);
    }

    .strip-svg-frame.is-wide {
        height: auto;
        width: min(86vw, 460px);
    }

    :where(.segmented-control, .strip-side-selector, .button-row) {
        flex-direction: column;
    }

    :where(.segmented-control span, .strip-side-selector span, .button-row button) {
        justify-content: center;
        width: 100%;
    }

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