/* ── Reset / base ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:       #f4f5f7;
    --surface:  #ffffff;
    --toolbar:  #1e2026;
    --toolbar-border: #2e3139;
    --accent:   #4a90e2;
    --danger:   #e25454;
    --text:     #1a1d23;
    --muted:    #6b7280;
    --radius:   8px;
    --shadow:   0 2px 12px rgba(0,0,0,.12);
}

html, body { height: 100%; font-family: system-ui, -apple-system, sans-serif; color: var(--text); }

/* ── Upload page ────────────────────────────────────────────────────── */
body.upload-page {
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.upload-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.5rem 3rem;
    width: min(480px, 92vw);
    text-align: center;
}

.upload-card h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -.03em;
    margin-bottom: .25rem;
}

.upload-card .subtitle {
    color: var(--muted);
    margin-bottom: 1.75rem;
    font-size: .95rem;
}

.error-msg {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    padding: .6rem 1rem;
    font-size: .875rem;
    margin-bottom: 1rem;
}

.drop-zone {
    border: 2px dashed #d1d5db;
    border-radius: var(--radius);
    padding: 2rem 1rem;
    cursor: pointer;
    transition: border-color .15s, background .15s;
    position: relative;
}

.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--accent);
    background: #f0f7ff;
}

.drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.drop-content svg {
    color: var(--muted);
    margin-bottom: .75rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.drop-content p { color: var(--muted); font-size: .9rem; }
.drop-content .link { color: var(--accent); text-decoration: underline; cursor: pointer; }

.file-chosen { color: var(--text) !important; font-weight: 500; }
.hidden { display: none !important; }

button[type="submit"] {
    margin-top: 1.25rem;
    width: 100%;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    padding: .75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity .15s;
}
button[type="submit"]:disabled { opacity: .4; cursor: not-allowed; }
button[type="submit"]:not(:disabled):hover { opacity: .88; }

/* ── Annotate page layout ───────────────────────────────────────────── */
body.annotate-page {
    display: grid;
    grid-template-rows: 48px 1fr 28px;
    grid-template-columns: 1fr;
    height: 100vh;
    overflow: hidden;
    background: var(--bg);
}

/* ── Toolbar ────────────────────────────────────────────────────────── */
.toolbar {
    grid-row: 1;
    background: var(--toolbar);
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0 8px;
    border-bottom: 1px solid var(--toolbar-border);
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}
.toolbar::-webkit-scrollbar { display: none; }

.toolbar-logo {
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -.02em;
    text-decoration: none;
    padding: 0 8px;
    flex-shrink: 0;
}

.toolbar-sep {
    width: 1px;
    height: 24px;
    background: var(--toolbar-border);
    margin: 0 4px;
    flex-shrink: 0;
}

.tool-btn, .icon-btn {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    border-radius: 6px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background .1s, color .1s;
}

.icon-btn {
    width: 34px;
}

.tool-btn {
    width: auto;
    padding: 0 10px;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 500;
}
.tool-btn svg, .icon-btn svg { width: 18px; height: 18px; }
.tool-btn:hover, .icon-btn:hover { background: rgba(255,255,255,.08); color: #fff; }
.tool-btn.active { background: var(--accent); color: #fff; }
.icon-btn:disabled { opacity: .35; cursor: not-allowed; }

.export-btn { color: #6ee7b7; }
.export-btn:hover { background: rgba(110,231,183,.12); color: #6ee7b7; }
.save-server-btn { color: #93c5fd; }
.save-server-btn:hover { background: rgba(147,197,253,.12); color: #93c5fd; }

.color-swatch-wrap {
    position: relative;
    width: 30px;
    height: 30px;
    cursor: pointer;
    flex-shrink: 0;
}
.color-swatch-wrap input[type="color"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    border: none;
    padding: 0;
}
.color-swatch {
    display: block;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,.25);
    background: #f5c518;
    pointer-events: none;
    margin: 4px;
}

.stroke-wrap {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.stroke-wrap input[type="range"] {
    width: 64px;
    cursor: pointer;
    accent-color: var(--accent);
}

.toolbar-filename {
    margin-left: auto;
    color: #6b7280;
    font-size: .8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
    padding-right: 8px;
    flex-shrink: 1;
}

/* ── PDF Viewer ─────────────────────────────────────────────────────── */
.viewer {
    grid-row: 2;
    overflow-y: auto;
    overflow-x: auto;
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.page-container {
    position: relative;
    box-shadow: var(--shadow);
    background: #fff;
    flex-shrink: 0;
    user-select: none;
}

.pdf-canvas {
    display: block;
}

/* PDF.js text layer — sits above the PDF canvas for selection */
.textLayer {
    position: absolute;
    top: 0; left: 0;
    overflow: hidden;
    line-height: 1;
    pointer-events: none; /* enabled per-tool in JS */
}

/* PDF.js injects these */
.textLayer span,
.textLayer br { color: transparent; position: absolute; white-space: pre; cursor: text; }
.textLayer ::selection { background: rgba(74,144,226,.3); }
.textLayer ::-moz-selection { background: rgba(74,144,226,.3); }

/* Annotation canvas — topmost interactive layer */
.annotation-canvas {
    position: absolute;
    top: 0; left: 0;
    cursor: crosshair;
}

/* Text notes layer */
.notes-layer {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.note {
    position: absolute;
    pointer-events: auto;
    max-width: 240px;
    min-width: 40px;
    cursor: default;
}

body[data-active-tool="select"] .note {
    cursor: move;
}

.note-body {
    font-size: 13px;
    font-family: system-ui, sans-serif;
    background: rgba(255,251,200,.92);
    border: 1px solid #d4c84b;
    border-radius: 4px;
    padding: 3px 6px;
    white-space: pre-wrap;
    word-break: break-word;
    box-shadow: 0 1px 4px rgba(0,0,0,.15);
    user-select: none;
}

.note.selected .note-body {
    outline: 2px solid var(--accent);
}

.note-editor {
    position: absolute;
    min-width: 140px;
    min-height: 36px;
    font-size: 13px;
    font-family: system-ui, sans-serif;
    border: 2px solid var(--accent);
    border-radius: 4px;
    padding: 3px 6px;
    background: rgba(255,251,200,.97);
    resize: both;
    z-index: 10;
    outline: none;
    box-shadow: 0 2px 8px rgba(0,0,0,.18);
}

/* ── Status bar ─────────────────────────────────────────────────────── */
#status-bar {
    grid-row: 3;
    background: var(--toolbar);
    border-top: 1px solid var(--toolbar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    font-size: .75rem;
    color: #6b7280;
}