:root {
    --bg-main: #f8fafc;
    --sidebar-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

.hidden {
    display: none !important;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ── App container — CSS Grid: header spans all 3 columns ── */
.stamp-app-container {
    display: grid;
    grid-template-columns: 290px 1fr 230px;
    grid-template-rows: auto auto;
    width: 100%;
    max-width: 1400px;
    max-height: 96vh;
    margin: 0 auto;
    background: var(--bg-main);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

/* Shared header — spans all 3 columns */
.app-header {
    grid-column: 1 / -1;
    grid-row: 1;
    padding: 13px 24px;
    border-bottom: 1px solid var(--border-color);
    background: #ffffff;
    display: flex;
    align-items: center;
    gap: 20px;
}

.app-header h2 {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    margin: 0;
}

.app-header p {
    font-size: 13px;
    color: var(--text-muted);
    margin: 0;
}

.header-icon {
    width: 22px;
    height: 22px;
    object-fit: contain;
}

/* ── Panels (row 2) ─────────────────────────────────── */
.stamp-panel {
    grid-row: 2;
    display: flex;
    flex-direction: column;
    background: var(--sidebar-bg);
    overflow-y: auto;
}

.stamp-panel-left {
    grid-column: 1;
    border-right: 1px solid var(--border-color);
}

/* Right panel — compact settings */
.stamp-panel-right {
    grid-column: 3;
    border-left: 1px solid var(--border-color);
    background: #f8fafc;
}

.stamp-panel-right .controls-section {
    padding: 16px;
}

.stamp-panel-right .controls-footer {
    padding: 16px;
}

.stamp-panel-right .input-group label {
    font-size: 13px;
}

.stamp-panel-right .controls-section h3 {
    margin-bottom: 12px;
}

.controls-section {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.controls-section h3 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 16px;
}

.input-group {
    margin-bottom: 16px;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-main);
}

.input-group input[type="text"],
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
    outline: none;
    resize: vertical;
}

.input-group input[type="text"]:focus,
.input-group textarea:focus,
.input-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-group input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
}

.input-group input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
}

.range-value {
    display: inline-block;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
    font-variant-numeric: tabular-nums;
}

.controls-footer {
    padding: 24px;
}

.primary-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.secondary-btn {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    background: #f1f5f9;
}

.primary-btn:hover {
    background: var(--primary-hover);
}

.primary-btn:active {
    transform: translateY(1px);
}

/* Preview Area — fills horizontal space, stretches to tallest sibling */
.stamp-preview-area {
    grid-row: 2;
    grid-column: 2;
    align-self: stretch;      /* match the height of the tallest panel */
    background: #ffffff;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-scroll-container {
    width: 100%;
    height: 100%;
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.canvas-wrapper {
    background: #ffffff;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.07);
    flex-shrink: 0;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

/* Templates Section */
.templates-section {
    width: 100%;
    max-width: 800px;
    background: white;
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.more-templates-drawer {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px dashed var(--border-color);
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toggle-btn-centered {
    display: block;
    margin: 32px auto 0;
    width: 100%;
    max-width: 280px;
    background-color: var(--primary);
    color: white;
}

.toggle-btn-centered:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.section-header {
    margin-bottom: 24px;
}

.section-header h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.section-header p {
    font-size: 14px;
    color: var(--text-muted);
}

.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
}

.template-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.template-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.template-preview {
    width: 80px;
    height: 80px;
    border: 2px solid var(--primary);
    background: white;
    opacity: 0.85;
}

.circle-preview {
    border-radius: 50%;
    position: relative;
    border-width: 3px;
}

.circle-preview::after {
    content: '';
    position: absolute;
    inset: 10px;
    border: 1px solid var(--primary);
    border-radius: 50%;
    opacity: 0.6;
}

.rect-preview {
    border-radius: 8px;
    width: 100px;
    height: 60px;
    position: relative;
}

.rect-preview::after {
    content: '';
    position: absolute;
    inset: 8px;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
}

.oval-preview {
    border-radius: 50% / 30%;
    width: 100px;
    height: 60px;
    position: relative;
}

.oval-preview::after {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid #cbd5e1;
    border-radius: 50% / 30%;
}

.square-preview {
    border-radius: 4px;
    width: 70px;
    height: 70px;
    position: relative;
}

.square-preview::after {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid #cbd5e1;
    border-radius: 2px;
}

.template-card span {
    font-size: 13px;
    font-weight: 600;
    text-align: center;
}

/* Preview Text Decorations */
.template-preview {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.template-preview span {
    font-size: 6px;
    font-weight: 700;
    color: #94a3b8;
    pointer-events: none;
    line-height: 1;
}

.preview-text-arc {
    position: absolute;
    top: 14px;
    font-size: 5px !important;
}

.preview-text-arc-thin {
    position: absolute;
    top: 16px;
    font-size: 4px !important;
}

.preview-text-center {
    font-size: 8px !important;
    color: #64748b !important;
}

.preview-text-center-bold {
    font-size: 9px !important;
    font-weight: 800 !important;
    color: #475569 !important;
}

.preview-text-line {
    margin-bottom: 2px;
}

.preview-text-line-thin {
    font-size: 5px !important;
}

.preview-text-line-bold {
    font-size: 7px !important;
    font-weight: 800 !important;
}

/* Download format row */
.download-format-row {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.format-btn {
    flex: 1;
    padding: 11px 6px;
    background: #16a34a;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s, transform 0.1s;
    letter-spacing: 0.03em;
}

.format-btn:hover {
    background: #15803d;
}

.format-btn:active {
    transform: translateY(1px);
}

/* Size hint inline with label */
.label-hint {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-muted);
    margin-left: 6px;
    font-variant-numeric: tabular-nums;
}

/* Duplicate text button */
.dup-btn {
    font-size: 11px;
    font-weight: 500;
    color: var(--primary);
    background: none;
    border: 1px solid var(--primary);
    border-radius: 4px;
    padding: 2px 7px;
    cursor: pointer;
    margin-left: 6px;
    transition: background-color 0.15s, color 0.15s;
    vertical-align: middle;
    line-height: 1.4;
}

.dup-btn:hover {
    background: var(--primary);
    color: white;
}

.dup-input {
    margin-top: 6px;
}

/* ── Canvas Stack (stamp + symbol overlay) ── */
.canvas-stack {
    display: grid;
    max-width: 100%;
    max-height: 100%;
}

.canvas-stack canvas {
    grid-area: 1 / 1;
    max-width: 100%;
    max-height: 100%;
    display: block;
}

#symbolCanvas {
    cursor: crosshair;
}

/* ── Symbol Panel ── */
.symbol-palette {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    margin-bottom: 10px;
}

.sym-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 4px 6px;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 17px;
    line-height: 1;
    font-family: inherit;
    color: var(--text-main);
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.sym-btn span {
    font-size: 10px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.15s;
}

.sym-btn:hover,
.sym-btn:hover span {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.sym-ctrl-group {
    margin-bottom: 8px !important;
}

.sym-ctrl-group label {
    font-size: 12px !important;
    margin-bottom: 4px !important;
}

.symbol-actions {
    display: flex;
    gap: 6px;
    margin-top: 8px;
}

.sym-action-btn {
    flex: 1;
    padding: 7px 4px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: #f1f5f9;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    color: var(--text-main);
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.sym-action-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.sym-delete-btn:hover {
    background: #ef4444;
    border-color: #ef4444;
}

.sym-hint {
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 8px;
    line-height: 1.4;
}

/* Specific Preview Variations */
.minimal-preview::after {
    border-style: dashed;
}

.official-preview {
    border-width: 3px;
}