/**
 * VTRACK Letter Highlight Effects
 * CSS анимации и стили для интерактивной подсветки букв на чертежах
 *
 * Версия: 1.0.0
 * Дата: 2026-01-17
 */

/* ============================================
   SVG OVERLAY LAYER
   ============================================ */

.letter-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
    overflow: visible;
}

/* ============================================
   LETTER HIGHLIGHT (статичный прямоугольник)
   ============================================ */

.letter-highlight {
    fill: rgba(255, 215, 0, 0.6);
    stroke: #FFD700;
    stroke-width: 2;
    opacity: 0.85;
    transition: opacity 0.2s ease-out;
}

/* Более яркая подсветка при активации */
.letter-highlight.active {
    fill: rgba(255, 215, 0, 0.75);
    stroke-width: 2.5;
    opacity: 1;
}

/* ============================================
   ZOOM CONTAINER EFFECTS
   ============================================ */

.swf-container.zooming {
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 100;
}

.swf-container.zoomed {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

/* ============================================
   SPEC ROW HOVER ENHANCEMENTS
   ============================================ */

/* Усиление hover эффекта при подсветке буквы */
.spec-row.highlighting {
    background: var(--accent-light, #dbeafe) !important;
    border-left: 4px solid var(--accent, #0969da);
    padding-left: 12px;
    transform: translateX(2px);
    box-shadow: 0 2px 8px rgba(9, 105, 218, 0.15);
}

/* Подсветка параметра-буквы */
.spec-param.active {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: #000;
    box-shadow: 0 3px 10px rgba(255, 215, 0, 0.5);
    transform: scale(1.15);
}

/* ============================================
   ZOOM OVERLAY BACKDROP
   ============================================ */

.zoom-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 99;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease-out;
}

.zoom-backdrop.active {
    opacity: 1;
}

/* ============================================
   TOOLTIP (опционально для дополнительной инфы)
   ============================================ */

.letter-tooltip {
    position: absolute;
    background: var(--text, #24292f);
    color: var(--white, #ffffff);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    pointer-events: none;
    z-index: 1000;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.2s ease-out;
}

.letter-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
}

.letter-tooltip::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid var(--text, #24292f);
}

/* ============================================
   LOADING SPINNER (пока загружаются координаты)
   ============================================ */

.letter-highlight-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--accent, #0969da);
    border-radius: 50%;
    animation: spinner-rotate 0.8s linear infinite;
    z-index: 20;
}

@keyframes spinner-rotate {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Reduced motion для пользователей с настройками accessibility */
@media (prefers-reduced-motion: reduce) {
    .letter-highlight,
    .spec-param.active,
    .letter-tooltip,
    .zoom-backdrop,
    .swf-container.zooming {
        transition-duration: 0.05s !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .letter-highlight {
        fill: rgba(255, 255, 0, 0.7);
        stroke: #FFFF00;
        stroke-width: 3;
    }
}

/* ============================================
   DARK MODE SUPPORT (если понадобится)
   ============================================ */

@media (prefers-color-scheme: dark) {
    .letter-highlight {
        fill: rgba(255, 215, 0, 0.5);
        stroke: #FFD700;
        opacity: 0.9;
    }

    .letter-tooltip {
        background: #1a1a1a;
        border: 1px solid #333;
    }

    .letter-tooltip::after {
        border-top-color: #1a1a1a;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .letter-overlay,
    .zoom-backdrop,
    .letter-tooltip {
        display: none !important;
    }
}