html,
body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

/* Toolbar */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 16px;
    padding: 10px 16px;
    background: var(--dark-light);
    border-bottom: 1px solid var(--border);
}

.toolbar-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}

.toolbar-end {
    margin-left: auto;
}

.toolbar .btn {
    padding: 6px 12px;
}

.tool-btn.is-active {
    border-color: var(--primary);
    background: rgba(217, 119, 6, 0.2);
    color: var(--white);
}

.field select,
.field input[type="color"] {
    height: 34px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--dark);
    color: var(--gray-300);
    font: inherit;
    font-size: 0.9rem;
}

.field select {
    padding: 0 8px;
}

.field input[type="color"] {
    width: 40px;
    padding: 2px;
    cursor: pointer;
}

.zoom-label {
    min-width: 48px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-400);
}

/* Workspace */
.workspace {
    flex: 1;
    display: flex;
    min-height: 0;
}

.sidebar {
    width: 168px;
    flex-shrink: 0;
    overflow-y: auto;
    background: rgba(15, 23, 42, 0.6);
    border-right: 1px solid var(--border);
}

.thumbs {
    list-style: none;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.thumb {
    position: relative;
    padding: 6px;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
    font-size: 0.75rem;
    color: var(--gray-400);
}

.thumb:hover {
    background: var(--surface);
}

.thumb.is-current {
    border-color: var(--primary);
}

.thumb.is-dragging {
    opacity: 0.4;
}

.thumb.drop-before {
    box-shadow: 0 -4px 0 var(--primary-light);
}

.thumb.drop-after {
    box-shadow: 0 4px 0 var(--primary-light);
}

.thumb canvas {
    display: block;
    max-width: 100%;
    margin: 0 auto 4px;
    background: var(--white);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.viewer {
    flex: 1;
    overflow: auto;
    padding: 24px;
    display: flex;
    align-items: flex-start;
}

/* Auto margins centre the page but, unlike justify-content, still let a
   page wider than the viewer scroll to its left edge. */
.viewer > * {
    margin-left: auto;
    margin-right: auto;
}

.viewer.is-dragover .dropzone {
    border-color: var(--primary-light);
    background: rgba(217, 119, 6, 0.08);
}

.dropzone {
    max-width: 520px;
    margin-top: 8vh;
    padding: 48px 32px;
    text-align: center;
    border: 2px dashed var(--gray-600);
    border-radius: var(--radius);
}

.dropzone h1 {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.privacy-note {
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--gray-400);
}

.page-wrap {
    position: relative;
    flex-shrink: 0;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    background: var(--white);
}

.page-wrap canvas {
    display: block;
}

/* Annotations drawn on top of the page */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: 0 0;
    overflow: hidden;
    touch-action: none;
}

.overlay[data-tool="text"] {
    cursor: text;
}

.overlay[data-tool="highlight"],
.overlay[data-tool="whiteout"],
.overlay[data-tool="draw"] {
    cursor: crosshair;
}

.annot {
    position: absolute;
    transform-origin: 0 0;
    cursor: move;
}

.overlay:not([data-tool="select"]) .annot {
    pointer-events: none;
}

.overlay[data-tool="text"] .annot-text {
    pointer-events: auto;
    cursor: text;
}

.annot.is-selected {
    outline: 1.5px dashed var(--primary);
    outline-offset: 2px;
}

.annot-text {
    white-space: pre;
    line-height: 1.2;
    min-width: 4px;
}

.annot-text[contenteditable="true"] {
    cursor: text;
    outline: 1.5px solid var(--primary);
    background: rgba(255, 255, 255, 0.6);
}

.annot-rect-highlight {
    background: rgba(253, 224, 71, 0.45);
    mix-blend-mode: multiply;
}

.annot-rect-whiteout {
    background: #ffffff;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.annot-img img {
    display: block;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.annot-draw svg {
    display: block;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.resize-handle {
    position: absolute;
    right: -7px;
    bottom: -7px;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    background: var(--primary);
    border: 2px solid var(--white);
    cursor: nwse-resize;
}

.status {
    position: fixed;
    left: 50%;
    bottom: 20px;
    transform: translateX(-50%);
    padding: 10px 18px;
    border-radius: 8px;
    background: var(--gray-800);
    border: 1px solid var(--border);
    color: var(--white);
    font-size: 0.9rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.status.is-visible {
    opacity: 1;
}

.status.is-error {
    border-color: var(--danger);
}

@media (max-width: 720px) {
    /* One scrollable row keeps the page area large on phones. */
    .toolbar,
    .toolbar-group {
        flex-wrap: nowrap;
    }

    .toolbar {
        overflow-x: auto;
        gap: 12px;
    }

    .toolbar .btn {
        white-space: nowrap;
    }

    .toolbar-end {
        margin-left: 0;
    }

    .workspace {
        flex-direction: column-reverse;
    }

    .sidebar {
        width: auto;
        height: 130px;
        overflow-x: auto;
        overflow-y: hidden;
        border-right: none;
        border-top: 1px solid var(--border);
    }

    .thumbs {
        flex-direction: row;
        height: 100%;
    }

    .thumb canvas {
        max-height: 80px;
        width: auto;
    }

    .viewer {
        padding: 12px;
    }
}