* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #1a1a2e;
    --bg-light: #16213e;
    --surface: #0f3460;
    --accent: #e94560;
    --text: #eee;
    --text-dim: #999;
    --border: #333;
    --shadow: rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    font-style: italic;
    color: var(--accent);
    letter-spacing: 0.05em;
}

.filename {
    color: var(--text-dim);
    font-size: 0.875rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

select {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
}

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

.page-nav button {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 2rem;
    height: 1.75rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.page-nav button:hover {
    background: var(--accent);
}

#page-info {
    font-size: 0.875rem;
    color: var(--text-dim);
    min-width: 3rem;
    text-align: center;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    position: relative;
}

.drop-zone {
    width: 400px;
    height: 240px;
    border: 2px dashed var(--border);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(233, 69, 96, 0.08);
}

.drop-content {
    text-align: center;
}

.drop-icon {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.drop-content p {
    font-size: 1rem;
    color: var(--text);
}

.drop-sub {
    color: var(--text-dim) !important;
    font-size: 0.875rem !important;
    margin-top: 0.25rem;
}

.canvas-container {
    overflow: auto;
    padding: 2rem;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* When zoomed beyond fit, align to top-left so scrolling works naturally */
.canvas-container.zoomed {
    align-items: flex-start;
    justify-content: flex-start;
    cursor: grab;
}

.canvas-container.zoomed.panning {
    cursor: grabbing;
}

/* Wider scrollbars for easier panning */
.canvas-container::-webkit-scrollbar {
    width: 14px;
    height: 14px;
}

.canvas-container::-webkit-scrollbar-track {
    background: var(--bg);
}

.canvas-container::-webkit-scrollbar-thumb {
    background: #555;
    border-radius: 7px;
    border: 2px solid var(--bg);
}

.canvas-container::-webkit-scrollbar-thumb:hover {
    background: #777;
}

.canvas-container::-webkit-scrollbar-corner {
    background: var(--bg);
}

canvas {
    box-shadow: 0 4px 24px var(--shadow);
    transform-origin: 0 0;
    flex-shrink: 0;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.zoom-controls button {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 1.75rem;
    height: 1.75rem;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
}

.zoom-controls button:hover {
    background: var(--accent);
}

#zoom-level {
    font-size: 0.8rem;
    color: var(--text-dim);
    min-width: 2.5rem;
    text-align: center;
}

.loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 26, 46, 0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    z-index: 10;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

footer {
    padding: 0.375rem 1rem;
    background: var(--bg-light);
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-dim);
    flex-shrink: 0;
}

.hidden {
    display: none !important;
}

/* Minimap navigator */
.minimap {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 4px;
    box-shadow: 0 2px 12px var(--shadow);
    padding: 4px;
    z-index: 5;
    user-select: none;
}

.minimap canvas {
    display: block;
    max-width: 200px;
    max-height: 260px;
}

#minimap-viewport {
    position: absolute;
    border: 2px solid var(--accent);
    background: rgba(233, 69, 96, 0.15);
    cursor: grab;
    pointer-events: auto;
}

#minimap-viewport:active {
    cursor: grabbing;
}

/* Progress bar for banded viewport rendering */
.progress-container {
    position: fixed;
    bottom: 28px;  /* just above footer */
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 20;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: #6cf;
    transition: width 0.1s ease-out;
}

/* Drag-over overlay for the whole page when a file is being dragged */
body.dragging .drop-zone {
    border-color: var(--accent);
    background: rgba(233, 69, 96, 0.08);
}