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

:root {
    --bg: #f5f6f8;
    --panel: #ffffff;
    --border: #e2e4e9;
    --text: #1f2430;
    --text-muted: #6b7280;
    --accent: #4f46e5;
    --accent-light: #eef0fd;
    --success: #16a34a;
    --error: #dc2626;
    --radius: 8px;
}

body {
    font-family: -apple-system, "Segoe UI", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex; flex-direction: column; align-items: center;
    padding: 0 20px 40px;
}

.topbar {
    width: 100%; max-width: 1200px;
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
    width: 40px; height: 40px;
    background: var(--accent);
    border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; color: #fff;
}
.logo-name { font-size: 1.15rem; font-weight: 700; }
.logo-name span { color: var(--accent); }
.logo-tag { font-size: .75rem; color: var(--text-muted); }

.main-wrap {
    width: 100%; max-width: 1200px;
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 20px;
    align-items: start;
}
@media (max-width: 1000px) { .main-wrap { grid-template-columns: 1fr; } }

.left-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.upload-zone { padding: 20px; border-bottom: 1px solid var(--border); }
.panel-label {
    font-size: .75rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: .05em; color: var(--text-muted);
    margin-bottom: 12px;
}
.upload-box {
    border: 1.5px dashed var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
}
.upload-box:hover, .upload-box.drag-over { border-color: var(--accent); background: var(--accent-light); }
.upload-icon {
    width: 44px; height: 44px;
    background: var(--accent-light);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; color: var(--accent);
    margin: 0 auto 12px;
}
.upload-title { font-size: .9rem; font-weight: 600; margin-bottom: 4px; }
.upload-sub { font-size: .75rem; color: var(--text-muted); margin-bottom: 14px; }
.upload-btn {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--accent);
    color: #fff; border: none;
    padding: 8px 18px; border-radius: var(--radius);
    font-size: .82rem; font-weight: 600;
    cursor: pointer;
}
.upload-btn:hover { opacity: .9; }
#fileInput { display: none; }

.strength-zone { padding: 16px 20px; border-bottom: 1px solid var(--border); }
.strength-btns { display: flex; gap: 8px; }
.s-btn {
    flex: 1;
    padding: 8px 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    font-size: .8rem; font-weight: 600;
    cursor: pointer;
    text-align: center;
}
.s-btn:hover { border-color: var(--accent); }
.s-btn.active, .s-btn.active.gold {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}

.algo-zone { padding: 0; }
.algo-zone-header {
    padding: 14px 20px;
    display: flex; align-items: center; justify-content: space-between;
    border-bottom: 1px solid var(--border);
}
.algo-zone-title {
    font-size: .75rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: .05em; color: var(--text-muted);
}
.algo-badge {
    background: var(--accent-light);
    border-radius: 999px;
    padding: 2px 10px;
    font-size: .72rem; font-weight: 600;
    color: var(--accent);
}

.algo-list {
    display: flex;
    flex-direction: column;
}

.algo-row {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}
.algo-row:last-child { border-bottom: none; }
.algo-row:hover { background: var(--bg); }
.algo-row input[type="checkbox"] { display: none; }

.algo-stage-icon {
    flex-shrink: 0;
    width: 26px; height: 26px;
    border-radius: 7px;
    background: var(--accent-light);
    color: var(--accent);
    display: flex; align-items: center; justify-content: center;
    font-size: .75rem;
}
.algo-stage-tag {
    font-weight: 600;
    color: var(--accent);
}

.toggle {
    flex-shrink: 0;
    width: 34px; height: 18px;
    background: var(--border);
    border-radius: 999px;
    position: relative;
}
.toggle::after {
    content: '';
    position: absolute;
    width: 14px; height: 14px;
    background: #fff;
    border-radius: 50%;
    top: 2px; left: 2px;
    transition: transform .15s ease;
}
.algo-row input:checked + .toggle { background: var(--accent); }
.algo-row input:checked + .toggle::after { transform: translateX(16px); }

.algo-info { flex: 1; min-width: 0; }
.algo-name { font-size: .83rem; font-weight: 600; }
.algo-desc { font-size: .7rem; color: var(--text-muted); margin-top: 1px; }

.right-panel { display: flex; flex-direction: column; gap: 16px; }

.preview-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.preview-card-header {
    padding: 14px 20px;
    display: flex; align-items: center; justify-content: space-between;
    border-bottom: 1px solid var(--border);
}
.preview-card-title {
    font-size: .75rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: .05em; color: var(--text-muted);
}
.size-tag {
    font-size: .75rem; color: var(--text-muted);
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 3px 10px; border-radius: 999px;
}

.side-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.img-slot { position: relative; overflow: hidden; background: var(--bg); }
.img-slot + .img-slot { border-left: 1px solid var(--border); }
.img-slot-label {
    position: absolute; top: 10px; left: 10px; z-index: 4;
    background: rgba(255,255,255,.9);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 3px 10px;
    font-size: .7rem; font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
}
.img-slot.enhanced .img-slot-label { color: var(--accent); border-color: var(--accent); }

.img-wrap { width: 100%; aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.img-wrap img { width: 100%; height: 100%; object-fit: contain; display: block; }
.img-placeholder {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    width: 100%; height: 100%;
    color: var(--text-muted); font-size: .85rem; text-align: center;
    gap: 10px; padding: 20px;
}
.img-placeholder i { font-size: 2rem; color: var(--border); }

.compare-section { display: none; padding: 0; }
.compare-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: var(--bg);
    cursor: col-resize;
    user-select: none;
    display: block;
}
.compare-img-bottom { display: block; width: 100%; height: auto; }
.compare-clip { position: absolute; top: 0; left: 0; width: 50%; height: 100%; overflow: hidden; }
.compare-clip img { display: block; height: auto; }
.compare-divider {
    position: absolute; top: 0; bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: var(--accent);
    z-index: 10; cursor: col-resize;
}
.compare-handle {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 36px; height: 36px;
    background: var(--accent);
    border: 2px solid #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    gap: 3px; font-size: .7rem; color: #fff;
    pointer-events: none;
}
.compare-label {
    position: absolute; top: 12px;
    background: rgba(255,255,255,.9);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 3px 10px;
    font-size: .7rem; font-weight: 600; text-transform: uppercase;
    color: var(--text-muted);
    z-index: 5; pointer-events: none;
}
.compare-label.enhanced-label { color: var(--accent); border-color: var(--accent); }
.compare-label-left { left: 12px; }
.compare-label-right { right: 12px; }

.compare-toggle-bar { display: none; padding: 10px 20px; gap: 10px; border-top: 1px solid var(--border); }
.compare-toggle-bar.visible { display: flex; }
.view-btn {
    flex: 1;
    padding: 8px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    font-size: .8rem; font-weight: 600;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 7px;
}
.view-btn:hover { border-color: var(--accent); }
.view-btn.active { background: var(--accent-light); border-color: var(--accent); color: var(--accent); }

.stats-strip { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--border); }
.stat-block { padding: 14px 16px; border-right: 1px solid var(--border); text-align: center; }
.stat-block:last-child { border-right: none; }
.stat-val { font-size: 1.3rem; font-weight: 700; color: var(--accent); margin-bottom: 4px; }
.stat-key { font-size: .68rem; font-weight: 600; text-transform: uppercase; color: var(--text-muted); }
.stat-bar { height: 3px; background: var(--border); border-radius: 999px; overflow: hidden; margin-top: 6px; }
.stat-bar-fill { height: 100%; background: var(--accent); transition: width .3s ease; }

.action-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    display: flex; gap: 12px;
}
.action-btn {
    flex: 1;
    padding: 12px 20px;
    border: none; border-radius: var(--radius);
    font-size: .88rem; font-weight: 600;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.action-btn:hover { opacity: .9; }
.action-btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-enhance { background: var(--accent); color: #fff; }
.btn-download { background: var(--bg); border: 1px solid var(--border); color: var(--text); flex: 0 0 auto; min-width: 140px; }

.loader-overlay {
    display: none;
    position: absolute; inset: 0;
    background: rgba(255,255,255,.9);
    z-index: 20;
    flex-direction: column; align-items: center; justify-content: center; gap: 14px;
}
.loader-overlay.active { display: flex; }
.loader-ring-wrap { position: relative; width: 48px; height: 48px; }
.lring {
    position: absolute; width: 100%; height: 100%;
    border-radius: 50%;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    animation: lspin 1s linear infinite;
}
.lring:nth-child(2), .lring:nth-child(3) { display: none; }
@keyframes lspin { to { transform: rotate(360deg); } }
.loader-step { font-size: .85rem; font-weight: 600; }
.loader-sub { font-size: .75rem; color: var(--text-muted); }

.msg-bar {
    padding: 10px 16px;
    border-radius: var(--radius);
    font-size: .85rem; font-weight: 500;
    display: none;
}
.msg-bar.success { background: #ecfdf3; border: 1px solid #bbf7d0; color: var(--success); display: block; }
.msg-bar.error { background: #fef2f2; border: 1px solid #fecaca; color: var(--error); display: block; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (max-width: 640px) { body { padding: 0 12px 32px; } .action-card { flex-direction: column; } }