/* ========================================
   MOLBIT STYLES - Modular CSS
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary: #ff6b9d;
    --secondary: #4ecdc4;
    --accent: #ffe66d;
    --success: #4ecdc4;
    --warning: #ffe66d;
    --danger: #ff6b6b;
    --info: #a8dadc;
    
    /* Background */
    --bg-dark: #0f0c29;
    --bg-medium: #302b63;
    --bg-light: #24243e;
    
    /* Text */
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 40px;
    
    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-medium) 50%, var(--bg-light) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    font-size: 12px; /* Base font size reduced */
}

/* Main Layout */
#app {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    height: 100vh;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

.panel {
    background: rgba(36, 36, 62, 0.95);
    border-radius: var(--radius-lg);
    padding: 12px;
    overflow-y: auto;
    border: 2px solid rgba(255, 107, 157, 0.2);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.panel-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid rgba(255, 107, 157, 0.3);
}

.panel-header h2 {
    color: var(--primary);
    font-size: 1em;
    font-weight: 600;
}

/* ========================================
   LEFT PANEL: Element Selection
   ======================================== */

#level-selector-container {
    margin-bottom: var(--spacing-md);
}

#level-selector-container label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.9em;
}

#level-selector {
    width: 100%;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 107, 157, 0.3);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1em;
    cursor: pointer;
    transition: var(--transition-normal);
}

#level-selector:hover {
    border-color: var(--primary);
    background: rgba(255, 107, 157, 0.1);
}

#level-selector option {
    background: var(--bg-medium);
    color: var(--text-primary);
}

/* Atom Palette */
#atom-palette {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.atom-button {
    padding: 8px 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.8em;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}

.atom-button:hover {
    background: rgba(255, 107, 157, 0.2);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.3);
}

.atom-button.selected {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 0 20px var(--primary);
}

.atom-button .symbol {
    font-size: 1.1em;
}

.atom-button .name {
    font-size: 0.7em;
    color: var(--text-secondary);
}

.atom-button.selected .name {
    color: white;
}

/* Help Button */
#help-button {
    width: 100%;
    margin-top: auto;
}

/* ========================================
   CENTER PANEL: Canvas & Controls
   ======================================== */

#center-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Level Info */
#level-info {
    text-align: center;
    padding: 10px 15px;
    background: rgba(255, 107, 157, 0.1);
    border-radius: var(--radius-md);
    border: 2px solid rgba(255, 107, 157, 0.3);
}

#level-title {
    font-size: 1.1em;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

#level-objective {
    color: var(--text-secondary);
    font-size: 0.85em;
}

/* Canvas */
#canvas {
    flex: 1;
    background: radial-gradient(circle at center, rgba(78, 205, 196, 0.05), transparent);
    border-radius: var(--radius-lg);
    cursor: crosshair;
    border: 3px solid rgba(78, 205, 196, 0.3);
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.3);
    position: relative !important; /* FORCE relative positioning */
    overflow: hidden;
    min-height: 400px; /* Ensure it has height */
}

#canvas:hover {
    border-color: var(--secondary);
}

/* Bond Selector */
#bond-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
}

#bond-selector label {
    color: var(--text-secondary);
    font-weight: bold;
}

#bond-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex: 1;
}

.bond-button {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition-normal);
}

.bond-button:hover {
    background: rgba(78, 205, 196, 0.2);
    border-color: var(--secondary);
}

.bond-button.active {
    background: var(--secondary);
    border-color: var(--secondary);
    box-shadow: 0 0 15px var(--secondary);
}

.bond-button.ionic {
    background: rgba(255, 230, 109, 0.1);
}

.bond-button.ionic:hover,
.bond-button.ionic.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg-dark);
}

/* Controls */
#controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* Buttons */
.btn {
    padding: 10px 15px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.85em;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition-normal);
    flex: 1;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #ff8fab);
    color: white;
}

.btn-primary:hover {
    box-shadow: 0 5px 20px rgba(255, 107, 157, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-warning {
    background: var(--warning);
    color: var(--bg-dark);
}

.btn-info {
    background: var(--info);
    color: var(--bg-dark);
}

/* ========================================
   RIGHT PANEL: Info & Feedback
   ======================================== */

#info-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

#info-panel > div {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

#info-panel h3 {
    font-size: 0.8em;
    color: var(--primary);
    margin-bottom: 5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-description {
    color: var(--text-secondary);
    font-size: 0.85em;
    margin-top: var(--spacing-xs);
}

/* Completeness Meter (was Stability) */
.meter {
    position: relative;
    height: 28px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.meter-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--danger), var(--warning), var(--success));
    transition: width var(--transition-slow);
    border-radius: var(--radius-md);
}

.meter-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
    font-size: 0.85em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

/* Display Boxes */
.display-box {
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.9em;
    font-weight: bold;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder {
    color: var(--text-secondary);
    font-weight: normal;
    font-style: italic;
}

/* Notifications */
#notifications {
    min-height: 60px;
}

.notification {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.notification.success {
    background: rgba(78, 205, 196, 0.2);
    border: 2px solid var(--success);
    color: var(--success);
}

.notification.error {
    background: rgba(255, 107, 107, 0.2);
    border: 2px solid var(--danger);
    color: var(--danger);
}

.notification.info {
    background: rgba(168, 218, 220, 0.2);
    border: 2px solid var(--info);
    color: var(--info);
}

/* ========================================
   CANVAS ELEMENTS (Dynamic)
   ======================================== */

.atom {
    position: absolute !important; /* FORCE absolute positioning */
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 11px;
    cursor: pointer;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.4);
    transition: var(--transition-fast);
    user-select: none;
    z-index: 10; /* Ensure atoms are on top */
}

.atom:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.6);
}

.atom.highlighted {
    box-shadow: 0 0 25px currentColor;
    animation: pulse 0.5s ease;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.atom.ionic {
    border: 3px dashed var(--accent);
}

.atom .charge {
    position: absolute;
    top: -6px;
    right: -6px;
    background: var(--accent);
    color: var(--bg-dark);
    font-size: 10px;
    font-weight: bold;
    padding: 2px 5px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--bg-dark);
    min-width: 16px;
    text-align: center;
}

.bond-line {
    position: absolute;
    background: rgba(255, 255, 255, 0.7);
    transform-origin: left center;
    pointer-events: none;
    transition: var(--transition-fast);
}

.bond-line.ionic-bond {
    background: none;
    border-top: 3px dashed var(--accent);
    height: 0 !important;
    box-shadow: 0 0 10px rgba(255, 230, 109, 0.5);
}

.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--secondary);
    border-radius: 50%;
    pointer-events: none;
    animation: particle-burst 0.6s ease-out forwards;
}

@keyframes particle-burst {
    0% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(var(--tx), var(--ty)) scale(0);
    }
}

/* ========================================
   MODAL
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-medium);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    border: 3px solid var(--primary);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid rgba(255, 107, 157, 0.3);
}

.modal-header h2 {
    color: var(--primary);
    font-size: 1.5em;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 2.5em;
    cursor: pointer;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition-normal);
}

.close-btn:hover {
    background: rgba(255, 107, 157, 0.2);
    transform: rotate(90deg);
}

.modal-body section {
    margin-bottom: var(--spacing-lg);
}

.modal-body h3 {
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.modal-body p,
.modal-body li {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.modal-body ol,
.modal-body ul {
    margin-left: var(--spacing-lg);
}

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

@media (max-width: 1200px) {
    #app {
        grid-template-columns: 250px 1fr 280px;
    }
}

@media (max-width: 900px) {
    #app {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
        height: auto;
        min-height: 100vh;
    }
    
    .panel {
        overflow-y: visible;
    }
    
    #left-panel {
        order: 1;
    }
    
    #center-panel {
        order: 2;
        min-height: 500px;
    }
    
    #right-panel {
        order: 3;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.hidden {
    display: none !important;
}

.disabled {
    opacity: 0.5;
    pointer-events: none;
}

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }