@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-primary: #0a0b10;
    --bg-secondary: #121420;
    --bg-tertiary: #1a1d30;
    
    --accent-uv: #8b5cf6; /* Violet */
    --accent-neon: #06b6d4; /* Cyan */
    --accent-glow: rgba(139, 92, 246, 0.15);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --border-color: #2a2e45;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    --glass-bg: rgba(18, 20, 32, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-uv);
}

/* Layout */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    background: linear-gradient(180deg, rgba(139, 92, 246, 0.1) 0%, rgba(10, 11, 16, 0) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-uv), var(--accent-neon));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 1.25rem;
    box-shadow: 0 0 20px var(--accent-glow);
    animation: pulse 3s infinite ease-in-out;
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #fff 60%, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text p {
    font-size: 0.75rem;
    color: var(--accent-neon);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

nav {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.nav-btn.active {
    color: #fff;
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.3);
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.1);
}

/* Tabs Content */
.tab-content {
    display: none;
    padding: 2.5rem 0;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

/* Main Dashboard layout */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* Card Styling */
.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: border-color 0.3s ease;
}

.card:hover {
    border-color: rgba(139, 92, 246, 0.2);
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.card-title i {
    color: var(--accent-neon);
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.select-wrapper, .input-wrapper {
    position: relative;
}

select, input[type="text"], input[type="number"] {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.8rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.3s ease;
}

select:focus, input:focus {
    border-color: var(--accent-uv);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Property Selection Grid */
.checkbox-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.checkbox-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.checkbox-card:hover {
    border-color: rgba(139, 92, 246, 0.3);
    background: rgba(139, 92, 246, 0.02);
}

.checkbox-card input[type="checkbox"] {
    accent-color: var(--accent-uv);
    width: 16px;
    height: 16px;
}

.checkbox-card.selected {
    border-color: var(--accent-uv);
    background: rgba(139, 92, 246, 0.05);
}

.checkbox-card span {
    font-size: 0.85rem;
    font-weight: 500;
}

/* Predict Button */
.btn-primary {
    background: linear-gradient(135deg, var(--accent-uv), #7c3aed);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 1rem 2rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Result panel styling */
.result-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-muted);
}

.result-placeholder i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: var(--border-color);
    animation: float 4s ease-in-out infinite;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
}

.result-meta h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: #fff;
}

.result-meta p {
    font-size: 0.85rem;
    color: var(--accent-neon);
    font-weight: 600;
}

.badge {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-neon);
    border: 1px solid rgba(6, 182, 212, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Formulation Table */
.recipe-table-container {
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.recipe-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

.recipe-table th {
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    text-transform: uppercase;
}

.recipe-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.recipe-table tr:last-child td {
    border-bottom: none;
}

.recipe-table tr.total-row {
    font-weight: 700;
    background: rgba(255, 255, 255, 0.02);
}

/* Interactive weight calculator */
.calculator-box {
    background: rgba(139, 92, 246, 0.05);
    border: 1px solid rgba(139, 92, 246, 0.15);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.calculator-box .input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calculator-box input {
    max-width: 120px;
    text-align: center;
    font-weight: 700;
}

/* Distribution bar chart */
.chart-container {
    margin-bottom: 1.5rem;
}

.chart-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.bar-wrapper {
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
    display: flex;
}

.bar-segment {
    height: 100%;
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
}

/* Segment colors */
.seg-oligomer { background: #8b5cf6; }
.seg-monomer { background: #06b6d4; }
.seg-filler { background: #ec4899; }
.seg-photo { background: #f59e0b; }
.seg-additive { background: #10b981; }

.chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 2px;
}

/* Details and Warnings */
.explanation-box {
    background: rgba(255, 255, 255, 0.02);
    border-left: 3px solid var(--accent-neon);
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    margin-bottom: 1rem;
    font-size: 0.85rem;
}

.warning-box {
    background: rgba(239, 68, 68, 0.05);
    border-left: 3px solid var(--danger);
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    font-size: 0.85rem;
    color: #fca5a5;
}

.actions-row {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex: 1;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--text-secondary);
}

/* Formula Library Styles */
.library-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.search-box {
    position: relative;
    max-width: 400px;
    width: 100%;
}

.search-box input {
    padding-left: 2.5rem;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.formula-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.formula-card:hover {
    border-color: var(--accent-uv);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(139, 92, 246, 0.15);
}

.formula-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.formula-card-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.5rem;
}

.formula-card-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.formula-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    font-size: 0.75rem;
}

/* Material Dictionary Styles */
.material-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.material-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.material-item:hover {
    border-color: rgba(6, 182, 212, 0.3);
}

.material-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.material-name {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-neon);
}

.material-nature {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

.material-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.material-details {
    display: flex;
    gap: 1.5rem;
    font-size: 0.8rem;
}

.material-detail-item strong {
    color: #fff;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

.modal-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 700px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close:hover {
    color: #fff;
}

.modal-body {
    padding: 2rem;
    max-height: 70vh;
    overflow-y: auto;
}

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

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 20px rgba(139, 92, 246, 0.15); }
    50% { box-shadow: 0 0 35px rgba(139, 92, 246, 0.4); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Print Styles */
@media print {
    body {
        background: #fff;
        color: #000;
    }
    header, nav, .btn-primary, .btn-secondary, .calculator-box, .actions-row, .card:first-child {
        display: none !important;
    }
    .dashboard-grid {
        grid-template-columns: 1fr !important;
    }
    .card {
        border: none !important;
        box-shadow: none !important;
        background: transparent !important;
        padding: 0 !important;
    }
    .recipe-table th {
        background: #eee !important;
        color: #000 !important;
    }
    .recipe-table td {
        border-bottom: 1px solid #ccc !important;
    }
}