/* ==============================================
   EXPERIMENT COMMON STYLES
   ============================================== */

:root {
    /* Labosfera Colors */
    --primary-color: #0066CC;
    --secondary-color: #00A86B;
    --accent-color: #FF6B35;
    --success-color: #00C853;
    --warning-color: #FFB300;
    --error-color: #D32F2F;
    
    /* UI Colors */
    --bg-primary: #0A0E27;
    --bg-secondary: #1a1f3a;
    --bg-tertiary: #252b4a;
    --text-primary: #E8EAF6;
    --text-secondary: #9FA8DA;
    --border-color: rgba(159, 168, 218, 0.2);
    
    /* Glassmorphism */
    --glass-bg: rgba(26, 31, 58, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* Animations */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0A0E27 0%, #1a1f3a 50%, #0A0E27 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ==============================================
   HEADER
   ============================================== */

.experiment-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.btn-back {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-back:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(-5px);
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.4);
}

.experiment-title {
    flex: 1;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.experiment-number {
    display: block;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: rotate(90deg) scale(1.1);
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.4);
}

/* ==============================================
   PROGRESS BAR
   ============================================== */

.progress-container {
    padding: 2rem 2rem 1rem;
    background: var(--bg-secondary);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 20px var(--primary-color);
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    transition: var(--transition-smooth);
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 1;
}

.step-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    transition: var(--transition-smooth);
}

.step.active .step-circle {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--primary-color);
    animation: pulse 2s infinite;
}

.step.completed .step-circle {
    background: var(--success-color);
    border-color: var(--success-color);
}

.step.completed .step-circle::after {
    content: '✓';
}

.step-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.step.active .step-label {
    color: var(--text-primary);
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 20px var(--primary-color);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 30px var(--primary-color);
    }
}

/* ==============================================
   MAIN LAYOUT
   ============================================== */

.experiment-container {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 450px;
    gap: 2rem;
    padding: 2rem;
    max-width: 1920px;
    margin: 0 auto;
    height: calc(100vh - 85px);
    overflow-y: auto;
    overflow-x: hidden;
}

/* ==============================================
   SIMULATOR PANEL
   ============================================== */

.simulator-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--glass-shadow);
}

.simulator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.simulator-header h2 {
    font-size: 1.6rem;
    color: var(--text-primary);
}

.spring-selector {
    display: flex;
    gap: 1rem;
}

.spring-selector label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-weight: 600;
}

.spring-selector label:hover {
    border-color: var(--primary-color);
    background: rgba(0, 102, 204, 0.1);
}

.spring-selector input[type="radio"]:checked + label,
.spring-selector label:has(input[type="radio"]:checked) {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.4);
}

/* ==============================================
   CANVAS CONTAINER
   ============================================== */

.canvas-container {
    position: relative;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    height: clamp(1000px, 90vh, 1400px); /* Significantly increased for spring with multiple weights */
    background: linear-gradient(180deg, #1a1f3a 0%, #0f1429 100%);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
    /* 🔧 FIX: Предотвращаем прокрутку и зум на тач-устройствах */
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
}

.canvas-container canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#drag-drop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 5;
    cursor: grab;
    pointer-events: auto;
    background: transparent;
    /* 🔧 FIX: Предотвращаем нежелательные действия браузера на тач-устройствах */
    touch-action: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 39, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 10;
    transition: opacity 0.3s ease-out;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==============================================
   INSTRUCTIONS
   ============================================== */

.instructions {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: rgba(0, 102, 204, 0.1);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    margin-top: 1rem;
}

.instruction-icon {
    font-size: 2rem;
}

.instruction-text {
    flex: 1;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ==============================================
   CONTROL PANEL
   ============================================== */

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 0.5rem;
}

.control-panel::-webkit-scrollbar {
    width: 6px;
}

.control-panel::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

.control-panel::-webkit-scrollbar-thumb {
    background: rgba(0, 102, 204, 0.5);
    border-radius: 3px;
}

.control-panel::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 102, 204, 0.7);
}

.panel-section {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
    flex-shrink: 0;
}

.panel-section h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Индикатор прокрутки для тач-устройств */
.panel-section h3::after {
    content: "";
    display: none;
}

@media (hover: none) and (pointer: coarse) {
    .panel-section h3::after {
        content: "⇅";
        display: inline-block;
        margin-left: 8px;
        opacity: 0.5;
        font-size: 1.2rem;
        color: var(--secondary-color);
        animation: scrollHint 2s ease-in-out infinite;
    }
    
    @keyframes scrollHint {
        0%, 100% { transform: translateY(0); opacity: 0.5; }
        50% { transform: translateY(3px); opacity: 0.8; }
    }
}

/* ==============================================
   WEIGHTS
   ============================================== */

.weights-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
    max-height: 280px;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.4rem;
    /* 🔧 TOUCH FIX: Разрешаем прокрутку пальцем в контейнере */
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch; /* iOS плавная прокрутка */
    scroll-behavior: smooth;
    /* Увеличиваем зону прокрутки для удобства */
    padding-right: 8px;
}

.weights-container::-webkit-scrollbar {
    width: 8px; /* Увеличен для тач-устройств */
}

.weights-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}

.weights-container::-webkit-scrollbar-thumb {
    background: rgba(0, 102, 204, 0.5);
    border-radius: 4px;
    /* Увеличиваем видимость для тач */
    min-height: 40px;
}

.weights-container::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 102, 204, 0.7);
}

/* Индикатор прокрутки для тач-устройств */
@media (hover: none) and (pointer: coarse) {
    .weights-container::-webkit-scrollbar {
        width: 12px;
    }
    
    .weights-container::-webkit-scrollbar-thumb {
        background: rgba(0, 168, 107, 0.6);
        border: 2px solid rgba(15, 20, 41, 0.3);
    }
}

.weight-item,
.equipment-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 0.5rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: grab;
    transition: var(--transition-smooth);
    user-select: none;
    min-height: 95px;
    box-sizing: border-box;
    /* 🔧 CRITICAL FIX: Разрешаем Interact.js обрабатывать touch без конфликтов с браузером */
    touch-action: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

.weight-item.used {
    opacity: 0.45;
    cursor: not-allowed;
    filter: grayscale(0.3);
}

.weight-item[data-status="pending"] {
    opacity: 0.7;
    cursor: wait;
    filter: grayscale(0.2);
}

.weight-item[data-status="pending"] .weight-status {
    color: var(--warning-color);
}

.weight-item:not(.used):not([data-status="pending"]):hover,
.equipment-item:not(.used):hover {
    transform: translateY(-3px) scale(1.02);
    border-color: var(--secondary-color);
    box-shadow: 0 4px 12px rgba(0, 168, 107, 0.3);
}

.weight-item:active,
.equipment-item:active {
    cursor: grabbing;
    transform: scale(1.05) rotate(2deg);
}

.weight-item.dragging,
.equipment-item.dragging {
    opacity: 0.8;
    transform: scale(1.1);
    z-index: 1000;
    box-shadow: 0 8px 24px rgba(0, 168, 107, 0.5);
    border-color: var(--secondary-color);
    animation: draggingPulse 0.6s ease-in-out infinite;
}

@keyframes draggingPulse {
    0%, 100% {
        box-shadow: 0 8px 24px rgba(0, 168, 107, 0.5);
    }
    50% {
        box-shadow: 0 12px 32px rgba(0, 168, 107, 0.7);
    }
}

.weight-icon,
.equipment-icon {
    font-size: 2rem;
    line-height: 1;
}

.weight-label,
.equipment-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    line-height: 1.2;
}

.weight-meta,
.equipment-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.1;
}

.weight-status {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
}

.weight-figure {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.06);
    padding: 0.25rem;
}

.weight-figure img {
    max-width: 55px;
    max-height: 55px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.35));
    pointer-events: none;
}

.weight-placeholder {
    width: 60%;
    height: 60%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
}

/* ==============================================
   EQUIPMENT ITEMS
   ============================================== */

.equipment-item {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    padding: 0.75rem 0.5rem;
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    cursor: grab;
    transition: var(--transition-smooth);
    user-select: none;
    position: relative;
}

.equipment-item:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 8px 20px rgba(0, 168, 107, 0.25);
    transform: translateY(-4px);
}

.equipment-item--installed {
    border-style: solid;
    border-color: var(--secondary-color);
    box-shadow: 0 10px 24px rgba(0, 168, 107, 0.3);
}

.equipment-item.dragging {
    opacity: 0.6;
    transform: scale(0.96);
}

.equipment-icon {
    font-size: 2.2rem;
}

.equipment-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
}

.equipment-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.equipment-status {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.equipment-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    padding: 0.3rem 0.4rem;
    border-radius: 6px;
    background: rgba(0, 168, 107, 0.15);
    text-align: center;
}

.equipment-action {
    margin-top: 0.5rem;
    padding: 0.6rem 1rem;
    border: none;
    border-radius: 8px;
    background: rgba(0, 102, 204, 0.2);
    color: var(--primary-blue);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    min-height: 36px;
}

.equipment-action:hover {
    background: var(--primary-blue);
    color: #fff;
}

.weight-action {
    margin-top: 0.5rem;
    padding: 0.6rem 1rem;
    border: none;
    border-radius: 8px;
    background: rgba(0, 102, 204, 0.2);
    color: var(--primary-blue);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    min-height: 36px;
}

.weight-action:hover {
    background: var(--primary-blue);
    color: #fff;
}

/* ==============================================
   MEASUREMENT DISPLAY
   ============================================== */

.measurement-display {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.measurement-row {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 0.5rem;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.measurement-row.highlight {
    background: rgba(0, 168, 107, 0.2);
    border: 2px solid var(--secondary-color);
    padding: 0.65rem 1rem;
}

.measurement-row .label {
    font-size: 1rem;
    color: var(--text-secondary);
}

.measurement-row .value {
    font-size: 1.2rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
    min-width: 60px;
    text-align: right;
}

.measurement-row .unit {
    font-size: 1rem;
    color: var(--text-secondary);
    min-width: 30px;
}

/* ==============================================
   BUTTONS
   ============================================== */

.btn-primary,
.btn-secondary,
.btn-success {
    width: 100%;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 48px;
}

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

.btn-primary:hover:not(:disabled) {
    background: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 204, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: rgba(0, 102, 204, 0.1);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #00a244;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 200, 83, 0.4);
}

.btn-primary:disabled,
.btn-secondary:disabled,
.btn-success:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ==============================================
   RESULT DISPLAY
   ============================================== */

.result-display {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.result-formula {
    padding: 0.6rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    text-align: center;
    color: var(--primary-color);
    font-weight: 700;
}

.result-value {
    text-align: center;
}

.result-value .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.4rem;
}

.value-large {
    font-size: 2rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.result-accuracy {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.accuracy-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
}

.accuracy-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--error-color), var(--warning-color), var(--success-color));
    border-radius: 6px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.accuracy-label {
    font-size: 0.75rem;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ==============================================
   RESPONSIVE
   ============================================== */

@media (max-width: 1200px) {
    .experiment-container {
        grid-template-columns: 1fr;
    }
    
    .control-panel {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .experiment-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .experiment-title {
        font-size: 1.4rem;
    }
    
    .control-panel {
        grid-template-columns: 1fr;
    }
    
    .weights-container {
        grid-template-columns: repeat(2, 1fr);
    }
}