:root {
    --bg: #0f1419;
    --bg-elev: #1a212b;
    --bg-hover: #232c38;
    --border: #2a3441;
    --text: #e6edf3;
    --text-dim: #8b96a3;
    --primary: #4f8eff;
    --primary-hover: #6ba0ff;
    --danger: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --radius: 8px;
}

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

html, body {
    min-height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    font-size: 14px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px;
}

/* Navbar */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
}
.brand {
    font-weight: 700;
    font-size: 16px;
    color: var(--text);
}
.brand-icon {
    display: inline-block;
    margin-right: 8px;
}
.nav-links {
    display: flex;
    gap: 18px;
}
.nav-links a {
    color: var(--text-dim);
    font-weight: 500;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--text);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-elev);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
.btn:hover { background: var(--bg-hover); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: white; }
.btn-danger:hover:not(:disabled) { filter: brightness(1.1); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--text-dim); }
.btn-ghost:hover { color: var(--text); background: var(--bg-hover); }
.btn-lg { padding: 12px 24px; font-size: 16px; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* Forms */
input[type="text"], input[type="number"], input[type="password"],
select, textarea {
    width: 100%;
    padding: 9px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font: inherit;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
}
input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--primary); }
input[type="color"] {
    width: 36px; height: 36px;
    background: transparent; border: 1px solid var(--border);
    border-radius: 6px; padding: 2px; cursor: pointer;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-dim);
}
.form-row { margin-bottom: 14px; }
.form-row .help {
    display: block; margin-top: 4px;
    color: var(--text-dim); font-size: 12px;
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
}

/* Cards */
.card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}
.card h3 { margin-bottom: 12px; font-size: 15px; }

/* Hero / Tools */
.hero { margin-bottom: 28px; }
.hero h1 { font-size: 26px; margin-bottom: 6px; }
.hero p { color: var(--text-dim); font-size: 15px; }

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
}
.tool-card {
    display: block;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    color: var(--text);
    transition: transform 0.1s, border-color 0.15s, background 0.15s;
}
.tool-card:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
    color: var(--text);
}
.tool-icon {
    font-size: 32px;
    margin-bottom: 10px;
    display: inline-block;
}
.tool-card h3 { font-size: 15px; margin-bottom: 4px; }
.tool-card p { font-size: 13px; color: var(--text-dim); }

/* Tool page */
.tool-header { margin-bottom: 24px; }
.tool-header .back {
    color: var(--text-dim); font-size: 13px;
    display: inline-block; margin-bottom: 12px;
}
.tool-header h1 { font-size: 22px; }
.tool-header p { color: var(--text-dim); margin-top: 4px; }

/* Drop zone */
.dropzone {
    display: block;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 38px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover, .dropzone.drag {
    border-color: var(--primary);
    background: var(--bg-hover);
}
.dropzone strong { display: block; font-size: 15px; margin-bottom: 4px; }
.dropzone span { color: var(--text-dim); font-size: 13px; }
.dropzone input[type="file"] { display: none; }

.file-list {
    list-style: none;
    margin-top: 12px;
}
.file-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 6px;
    font-size: 13px;
}
.file-list .meta { color: var(--text-dim); margin-left: auto; }

/* Alerts */
.alert {
    padding: 12px 14px;
    border-radius: var(--radius);
    margin: 14px 0;
    font-size: 14px;
}
.alert-error { background: rgba(239,68,68,0.1); color: #f87171; border: 1px solid rgba(239,68,68,0.3); }
.alert-success { background: rgba(16,185,129,0.1); color: #34d399; border: 1px solid rgba(16,185,129,0.3); }
.alert-info { background: rgba(79,142,255,0.08); color: #9ec0ff; border: 1px solid rgba(79,142,255,0.25); }

/* Page Manager */
.page-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 14px;
    margin-top: 16px;
}
.page-card {
    position: relative;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 6px;
    padding: 8px;
    cursor: grab;
    user-select: none;
}
.page-card.dragging { opacity: 0.4; }
.page-card.drag-over { border-color: var(--primary); }
.page-card img {
    display: block;
    width: 100%;
    height: auto;
    background: white;
    border-radius: 3px;
}
.page-card .label {
    text-align: center;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-dim);
}
.page-card .source-badge {
    position: absolute;
    top: 4px; left: 4px;
    background: rgba(0,0,0,0.7);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 3px;
}
.page-card .source-blank { background: rgba(245,158,11,0.85); }
.page-card .source-insert { background: rgba(79,142,255,0.85); }
.page-card .delete-btn {
    position: absolute;
    top: 4px; right: 4px;
    background: rgba(239,68,68,0.9);
    color: white;
    border: none;
    border-radius: 3px;
    width: 22px; height: 22px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}
.page-card .delete-btn:hover { background: var(--danger); }

/* Toolbar (over previews) */
.toolbar {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    padding: 10px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
}
.toolbar .sep {
    width: 1px;
    height: 28px;
    background: var(--border);
    margin: 0 4px;
}

/* Page viewer (single page big preview, used in sign + edit) */
.viewer {
    display: flex;
    gap: 14px;
    margin-top: 16px;
}
.viewer-thumbs {
    width: 130px;
    flex-shrink: 0;
    max-height: 70vh;
    overflow-y: auto;
    padding: 4px;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.viewer-thumbs .page-card {
    margin-bottom: 8px;
}
.viewer-thumbs .page-card.active {
    border-color: var(--primary);
}
.viewer-stage {
    flex: 1;
    background: #1a1a1a;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 14px;
    overflow: auto;
    max-height: 70vh;
    text-align: center;
}
.viewer-stage canvas, .viewer-stage img {
    box-shadow: 0 4px 18px rgba(0,0,0,0.6);
    background: white;
    max-width: 100%;
    height: auto;
}

/* Page-canvas-wrapper – overlay annotation canvas */
.page-stack {
    position: relative;
    display: inline-block;
}
.page-stack .page-img {
    display: block;
}
.page-stack .annot-canvas {
    position: absolute;
    inset: 0;
    cursor: crosshair;
}

/* Sign Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.modal {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 16px 40px rgba(0,0,0,0.6);
}
.modal h3 { margin-bottom: 12px; }
.sign-pad {
    width: 100%;
    height: 200px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: crosshair;
    margin-bottom: 10px;
    display: block;
    touch-action: none;
}
.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}
.modal small {
    display: block;
    color: var(--text-dim);
    font-size: 12px;
    margin-top: 6px;
}

/* Edit toolbar selected box */
.selection-box {
    position: absolute;
    border: 2px dashed var(--primary);
    background: rgba(79,142,255,0.15);
    pointer-events: none;
}

/* Signatur-Marker auf Seite (dragbar + resizable) */
.sig-marker {
    position: absolute;
    border: 2px dashed var(--primary);
    background: rgba(79,142,255,0.04);
    cursor: move;
    user-select: none;
    -webkit-user-select: none;
    box-sizing: border-box;
    touch-action: none;
}
.sig-marker img {
    width: 100%;
    height: 100%;
    display: block;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}
.sig-marker .resize-handle {
    position: absolute;
    width: 22px;
    height: 22px;
    background: var(--primary);
    border: 2px solid white;
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0,0,0,0.4);
    cursor: nwse-resize;
    touch-action: none;
}
.sig-marker .handle-br {
    bottom: -12px;
    right: -12px;
}
.edit-list {
    margin-top: 12px;
    max-height: 250px;
    overflow-y: auto;
}
.edit-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    margin-bottom: 8px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.edit-item .edit-text {
    flex: 1;
    color: var(--text-dim);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Hidden helper */
.hidden { display: none !important; }