/* 이미지 도구 전용 스타일 — 아이잘한다 모던 심플 톤 (PDF 도구와 동일 토큰) */

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-soft: #dbeafe;
    --color-secondary: #16a34a;
    --color-canvas: #ffffff;
    --color-surface: #f8fafc;
    --color-surface-soft: #f1f5f9;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-hairline: #e2e8f0;
    --color-danger: #dc2626;
    --color-danger-soft: #fee2e2;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-pill: 999px;
    --elevation-1: 0 1px 2px rgba(15,23,42,0.06), 0 1px 3px rgba(15,23,42,0.04);
    --elevation-2: 0 4px 12px rgba(15,23,42,0.08), 0 2px 4px rgba(15,23,42,0.05);
    --font-main: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background: var(--color-surface);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* ── Header ── */
.util-header {
    background: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    position: sticky;
    top: 0;
    z-index: 10;
}
.util-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}
.util-title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
}
.back-link, .home-link {
    color: var(--color-text-muted);
    text-decoration: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-pill);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s;
}
.back-link:hover, .home-link:hover {
    background: var(--color-surface-soft);
    color: var(--color-text);
}

/* ── Main ── */
.util-main {
    padding-top: 1.5rem;
    padding-bottom: 5rem;
}
.util-note {
    background: var(--color-primary-soft);
    color: #1e3a8a;
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    margin: 0 0 1.25rem;
    font-size: 0.875rem;
}

/* ── Tabs (그룹 라벨 + 디바이더 지원) ── */
.tabs {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    padding: 0.3rem;
    margin-bottom: 1.25rem;
    overflow-x: auto;
    scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab-group-label {
    flex-shrink: 0;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 0.5rem 0 0.625rem;
    white-space: nowrap;
}
.tab-group-divider {
    flex-shrink: 0;
    width: 1px;
    height: 22px;
    background: var(--color-hairline);
    margin: 0 0.25rem;
}
.tab {
    flex-shrink: 0;
    min-width: max-content;
    padding: 0.55rem 0.875rem;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
    font-family: var(--font-main);
}
.tab:hover { color: var(--color-text); }
.tab.active {
    background: var(--color-primary);
    color: white;
}

/* ── Panels ── */
.tab-panel {
    display: none;
    background: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}
.tab-panel.active { display: block; }
.panel-title {
    margin: 0 0 0.375rem;
    font-size: 1.125rem;
    font-weight: 700;
}
.panel-desc {
    margin: 0 0 1.25rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ── Dropzone ── */
.dropzone {
    border: 2px dashed var(--color-hairline);
    border-radius: var(--radius-md);
    padding: 1.75rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    background: var(--color-surface);
}
.dropzone:hover,
.dropzone.dragover {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}
.dz-icon { font-size: 2rem; margin-bottom: 0.375rem; }
.dz-main { font-size: 0.95rem; font-weight: 600; }
.dz-link { color: var(--color-primary); text-decoration: underline; }
.dz-sub { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 0.25rem; }

/* ── File list ── */
.file-list {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.file-list:empty { display: none; }
.file-row {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
}
.file-row .file-thumb {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    background: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-sm);
    object-fit: cover;
    display: block;
}
.file-row .file-name {
    flex-grow: 1;
    font-size: 0.875rem;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}
.file-row .file-meta {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    flex-shrink: 0;
}
.file-row .row-btns {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}
.icon-btn {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid var(--color-hairline);
    color: var(--color-text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.icon-btn:hover { background: var(--color-surface-soft); color: var(--color-text); }
.icon-btn.danger:hover { background: var(--color-danger-soft); color: var(--color-danger); border-color: var(--color-danger); }
.icon-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Options block (합치기·변환·툴 패널 공용) ── */
.merge-options,
.tool-panel {
    margin-top: 1rem;
    padding: 0.875rem 1rem;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}
.tool-hint {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}
.control-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    flex-wrap: wrap;
}
.control-row > span:first-child {
    min-width: 80px;
    font-weight: 600;
    color: var(--color-text-muted);
}
.text-input {
    padding: 0.45rem 0.7rem;
    font-size: 0.9rem;
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-sm);
    background: var(--color-canvas);
    color: var(--color-text);
    font-family: var(--font-main);
    max-width: 240px;
}
.text-input:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -1px;
    border-color: var(--color-primary);
}
.range-input {
    flex: 1;
    max-width: 220px;
    accent-color: var(--color-primary);
}
.range-val {
    min-width: 2.5em;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}
.hint {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin: 0;
}

.resize-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.625rem;
}

/* ── Workspace (공유 캔버스 + 저장 툴바, 각 탭의 placeholder로 이동) ── */
.ws-canvas-area {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.ws-canvas-wrap {
    position: relative;
    width: 100%;
    max-height: 65vh;
    background:
        linear-gradient(45deg, #f1f5f9 25%, transparent 25%),
        linear-gradient(-45deg, #f1f5f9 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #f1f5f9 75%),
        linear-gradient(-45deg, transparent 75%, #f1f5f9 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, 10px 0;
    background-color: #fafbfc;
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}
.ws-canvas-wrap canvas {
    display: block;
    max-width: 100%;
    max-height: 65vh;
}
.ws-canvas-wrap #ws-overlay {
    position: absolute;
    pointer-events: none;
}
.ws-canvas-wrap.interactive #ws-overlay {
    pointer-events: auto;
    cursor: crosshair;
}
.ws-toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 0.625rem 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
}
.ws-info {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
}
.ws-spacer { flex: 1; }
.ws-toolbar select.text-input { padding: 0.35rem 0.55rem; font-size: 0.82rem; }

/* ── Buttons ── */
.actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}
.tool-panel .actions { margin-top: 0.25rem; }
.btn {
    padding: 0.55rem 1rem;
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, transform 0.05s;
    font-family: var(--font-main);
    border: 1px solid transparent;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.8rem; }
.btn-primary {
    background: var(--color-primary);
    color: white;
}
.btn-primary:hover:not(:disabled) { background: var(--color-primary-dark); }
.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    border-color: var(--color-hairline);
}
.btn-ghost:hover:not(:disabled) {
    background: var(--color-surface-soft);
    color: var(--color-text);
}

/* ── Status ── */
.status {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    min-height: 1.3em;
}
.status.error { color: var(--color-danger); }
.status.success { color: var(--color-secondary); }
.status .progress-bar {
    margin-top: 0.5rem;
    height: 6px;
    background: var(--color-surface-soft);
    border-radius: var(--radius-pill);
    overflow: hidden;
}
.status .progress-bar > div {
    height: 100%;
    background: var(--color-primary);
    transition: width 0.2s ease;
}

/* ── Footer ── */
.util-footer {
    border-top: 1px solid var(--color-hairline);
    background: var(--color-canvas);
    padding: 1.25rem 0;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-align: center;
}

/* ── 반응형 ── */
@media (max-width: 600px) {
    .util-main { padding-bottom: 3rem; }
    .tab-panel { padding: 1rem; }
    .tab-group-label { padding: 0 0.375rem 0 0.5rem; font-size: 0.68rem; }
    .tab { padding: 0.5rem 0.625rem; font-size: 0.82rem; }
    .panel-title { font-size: 1rem; }
    .panel-desc { font-size: 0.85rem; }
    .dropzone { padding: 1.25rem 0.75rem; }
    .ws-canvas-wrap { min-height: 200px; }
    .ws-canvas-wrap canvas { max-height: 50vh; }
}