/* ============================================
   IMPROVEMENT PAGE CSS
   Использует переменные из global.css
   ============================================ */

/* ---------- Layout ---------- */
.tool-page {
    position: relative;
    padding: calc(80px + var(--space-2xl)) 0 var(--space-2xl);
    min-height: 70vh;
}
.tool-page__title {
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: var(--space-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.tool-page__subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    max-width: 640px;
    margin-bottom: var(--space-xl);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
}
.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs__sep { color: var(--text-muted); }

/* ---------- Loader ---------- */
.tool-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-3xl) 0;
    color: var(--text-secondary);
}
.tool-loader__spinner {
    width: 48px; height: 48px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    border-top-color: var(--color-primary);
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Empty / Error ---------- */
.tool-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-3xl) var(--space-lg);
    text-align: center;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    background: var(--bg-card);
    color: var(--text-secondary);
}
.tool-empty svg { color: var(--text-muted); }
.tool-empty h2 { color: var(--text-primary); font-size: var(--font-size-xl); }
.tool-empty .btn { margin-top: var(--space-sm); }
.tool-empty--error { border-color: rgba(255, 59, 48, 0.3); }
.tool-empty--error svg { color: #ff3b30; }

/* ---------- Workspace ---------- */
.workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    animation: fadeIn 0.4s ease;
}
.card-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
}

/* ---------- Preview ---------- */
.workspace__preview {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}
.preview-frame {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-image:
        linear-gradient(45deg, rgba(255,255,255,0.05) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(255,255,255,0.05) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.05) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.05) 75%);
    background-size: 24px 24px;
    background-position: 0 0, 0 12px, 12px -12px, -12px 0;
    background-color: #12121c;
}
.preview-frame img {
    max-width: 100%;
    max-height: 60vh;
    object-fit: contain;
}
.preview-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(6px);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}
.preview-overlay__spinner {
    width: 36px; height: 36px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    border-top-color: var(--color-primary);
    animation: spin 0.7s linear infinite;
}
.preview-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}
.preview-meta__name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-primary);
    font-weight: 500;
}

/* ---------- Settings ---------- */
.settings-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}
.setting-group {
    border: none;
    margin-bottom: var(--space-lg);
}
.setting-group__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

/* ---------- Scale Selector (2× / 4×) ---------- */
.scale-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}
.scale-card {
    position: relative;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    background: rgba(255, 255, 255, 0.02);
}
.scale-card:hover {
    border-color: rgba(0, 240, 255, 0.3);
    background: rgba(0, 240, 255, 0.03);
}
.scale-card input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}
.scale-card.is-active {
    border-color: var(--color-primary);
    background: rgba(0, 240, 255, 0.06);
    box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.15), 0 8px 24px rgba(0, 240, 255, 0.1);
}
.scale-card__content {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
    text-align: center;
}
.scale-card__factor {
    font-size: 32px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.scale-card__desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
}
.scale-card input:focus-visible ~ .scale-card__content {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* ---------- Projection ---------- */
.projection {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
}
.projection__item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.projection__label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.projection__value {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
}
.projection__value--accent {
    color: var(--color-primary);
}
.projection__arrow {
    color: var(--text-muted);
    flex-shrink: 0;
}

/* ---------- Stats ---------- */
.improvement-stats {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    margin-bottom: var(--space-lg);
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat__label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.stat__value { font-size: var(--font-size-base); font-weight: 600; color: var(--text-primary); }
.stat__value--accent { color: var(--color-primary); }
.stat--diff .stat__value { color: #34c759; }
.stat--diff .stat__value--bigger { color: #ff3b30; }
.stat__arrow { color: var(--text-muted); flex-shrink: 0; }

/* ---------- Buttons ---------- */
.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}
.btn-group .btn--primary { flex: 1; justify-content: center; }
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}
.btn--loading { position: relative; pointer-events: none; }
.btn--loading .btn__label { opacity: 0.6; }
.btn--loading::after {
    content: '';
    position: absolute;
    right: 16px;
    width: 16px; height: 16px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: var(--text-primary);
    animation: spin 0.7s linear infinite;
}
.settings-note { font-size: 12px; color: var(--text-muted); }

/* ---------- Responsive ---------- */
@media (min-width: 900px) {
    .workspace {
        grid-template-columns: 1.4fr 1fr;
        align-items: start;
    }
}
@media (max-width: 480px) {
    .tool-page { padding-top: calc(60px + var(--space-lg)); }
    .scale-selector { grid-template-columns: 1fr; }
    .projection { flex-wrap: wrap; }
    .improvement-stats { flex-wrap: wrap; }
    .btn-group { flex-direction: column; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}