/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Medical Tech Color Palette */
    --primary: #0B3C5D;
    --secondary: #00B4D8;
    --accent: #48CAE4;
    --background: #F5F8FB;
    --text: #1A1A2E;
    --light-gray: #E8EEF2;
    --medium-gray: #CBD5E0;
    --dark-gray: #718096;
    --white: #FFFFFF;
    
    /* Dark Theme */
    --dark-bg: #0a1929;
    --dark-surface: #1a1a2e;
    --dark-text: #E2E8F0;
    
    /* Typography */
    --heading-font: 'Inter', sans-serif;
    --body-font: 'Roboto', sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(11, 60, 93, 0.1);
    --shadow-md: 0 4px 20px rgba(11, 60, 93, 0.15);
    --shadow-lg: 0 10px 40px rgba(11, 60, 93, 0.2);
    --shadow-xl: 0 20px 60px rgba(11, 60, 93, 0.25);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--body-font);
    font-weight: 400;
    line-height: 1.6;
    color: var(--white);
    background: var(--background);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-md);
    font-size: 1.125rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-lg) 0;
}

.dark-section {
    background: var(--dark-bg);
    color: var(--dark-text);
}

.dark-section h2,
.dark-section h3,
.dark-section h4 {
    color: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header h2 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-size: 2.25rem;
}

.section-header p {
    color: var(--dark-gray);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.dark-section .section-header p {
    color: var(--medium-gray);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    padding: 0.8rem 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-logo i {
    color: var(--secondary);
    font-size: 1.75rem;
}

.logo-accent {
    color: var(--secondary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-md);
}

.nav-menu li a {
    font-weight: 500;
    color: var(--text);
    padding: 0.5rem 0;
    font-size: 0.9375rem;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary);
    transition: width var(--transition-normal);
}

.nav-menu li a:hover {
    color: var(--secondary);
}

.nav-menu li a:hover::after {
    width: 100%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-presentation {
    background: var(--secondary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.6rem 1rem;
    font-weight: 500;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.btn-presentation:hover {
    background: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--primary);
    cursor: pointer;
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 90vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--space-lg);
    padding: 80px var(--space-md) var(--space-xl);
    background: linear-gradient(135deg, #f5f8fb 0%, #e3f2fd 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 180, 216, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(11, 60, 93, 0.05) 0%, transparent 50%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 550px;
}

.hero-title {
    font-size: 3rem;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    color: var(--primary);
}

.highlight {
    color: var(--secondary);
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 6px;
    background: rgba(0, 180, 216, 0.2);
    z-index: -1;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-bottom: var(--space-md);
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--secondary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--secondary);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-3d-preview {
    position: relative;
    height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.hero-3d-container {
    width: 100%;
    height: 100%;
    background: var(--dark-bg);
}

.scroll-indicator {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--secondary);
    font-size: 1.25rem;
    animation: bounce 2s infinite;
    z-index: 2;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-8px); }
}

/* ===== OVERVIEW SECTION ===== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.overview-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    text-align: center;
}

.overview-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
    color: var(--white);
    font-size: 1.75rem;
}

.overview-card h3 {
    margin-bottom: var(--space-sm);
    color: var(--primary);
    font-size: 1.25rem;
}

.overview-card p {
    color: var(--dark-gray);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* ===== PHYSICS SECTION ===== */
.physics-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.physics-explanation h3 {
    margin-bottom: var(--space-md);
    color: var(--white);
    font-size: 1.5rem;
}

.physics-explanation p {
    color: var(--medium-gray);
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

.physics-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.step {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: all var(--transition-normal);
}

.step:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.step-number {
    min-width: 36px;
    height: 36px;
    background: var(--secondary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1rem;
    flex-shrink: 0;
}

.step-content h4 {
    color: var(--white);
    margin-bottom: var(--space-xs);
    font-size: 1.125rem;
}

.step-content p {
    color: var(--medium-gray);
    margin-bottom: 0;
    font-size: 0.9375rem;
}

.physics-simulation {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.simulation-controls {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.sim-btn {
    padding: 0.7rem 1.25rem;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 500;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
}

.sim-btn:not(.secondary) {
    background: var(--secondary);
    color: var(--white);
}

.sim-btn:not(.secondary):hover {
    background: var(--accent);
    transform: translateY(-2px);
}

.sim-btn.secondary {
    background: transparent;
    color: var(--medium-gray);
    border: 1px solid var(--medium-gray);
}

.sim-btn.secondary:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

.simulation-visual {
    height: 250px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    position: relative;
    overflow: hidden;
}

.proton-visualization {
    width: 100%;
    height: 100%;
    position: relative;
}

.magnetic-field {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 180px;
    height: 180px;
    border: 2px dashed var(--secondary);
    border-radius: 50%;
    opacity: 0.5;
}

.protons-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.rf-pulse {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
}

.simulation-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
}

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

.info-label {
    display: block;
    font-size: 0.75rem;
    color: var(--medium-gray);
    margin-bottom: 0.25rem;
}

.info-value {
    display: block;
    font-size: 1rem;
    color: var(--white);
    font-weight: 500;
}

/* ===== 3D MRI SECTION ===== */
.mri-3d-section {
    display: grid;
    grid-template-areas:
        "viewer viewer"
        "controls details";
    grid-template-columns: 320px 1fr;
    grid-template-rows: 350px auto;
    gap: var(--space-md);
    max-width: 1400px;
    margin: 0 auto;
}

.mri-3d-viewer {
    grid-area: viewer;
    background: var(--dark-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.viewer-header {
    padding: var(--space-sm) var(--space-md);
    background: rgba(0, 0, 0, 0.5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.viewer-header h3 {
    color: var(--white);
    font-size: 1.125rem;
    margin: 0;
}

.viewer-stats {
    display: flex;
    gap: var(--space-md);
}

.stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--medium-gray);
    font-size: 0.75rem;
}

.stat i {
    color: var(--secondary);
    font-size: 0.875rem;
}

.viewer-container {
    position: relative;
    height: 280px;
}

.three-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.three-container canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

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

.loading-spinner {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: var(--space-md);
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--space-md);
}

.loading-progress {
    width: 250px;
    max-width: 90%;
}

.progress-bar {
    width: 100%;
    height: 5px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    color: var(--medium-gray);
    font-size: 0.75rem;
}

.viewer-hints {
    position: absolute;
    bottom: 0.75rem;
    left: 0.75rem;
    background: rgba(0, 0, 0, 0.8);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.7rem;
}

.hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--medium-gray);
    font-size: 0.7rem;
    margin-bottom: 0.25rem;
}

.hint:last-child {
    margin-bottom: 0;
}

.hint i {
    color: var(--accent);
    width: 14px;
    font-size: 0.75rem;
}

.viewer-controls {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    gap: 0.5rem;
}

.control-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.control-btn:hover {
    background: var(--secondary);
    transform: scale(1.1);
}

.viewer-info {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: rgba(0, 0, 0, 0.8);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.7rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    font-size: 0.7rem;
    margin-bottom: 0.25rem;
}

.info-row:last-child {
    margin-bottom: 0;
}

.label {
    color: var(--medium-gray);
}

.value {
    color: var(--white);
    font-family: 'Courier New', monospace;
    font-size: 0.7rem;
}

/* Controls Panel */
.controls-panel {
    grid-area: controls;
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-height: 450px;
    overflow-y: auto;
}

.panel-section {
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--light-gray);
    color: var(--text);
}

.panel-section:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.panel-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--space-sm);
    color: var(--primary);
    font-size: 1rem;
}

.panel-section h4 i {
    font-size: 0.875rem;
}

.view-modes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.mode-btn {
    padding: 0.5rem;
    border: 2px solid var(--light-gray);
    background: var(--white);
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.mode-btn:hover {
    border-color: var(--secondary);
    transform: translateY(-2px);
}

.mode-btn.active {
    border-color: var(--secondary);
    background: var(--secondary);
    color: var(--white);
}

.mode-btn i {
    font-size: 1rem;
}

.mode-btn span {
    font-size: 0.75rem;
    font-weight: 500;
}

.component-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    color: var(--text);
    max-height: 200px;
    overflow-y: auto;
    padding-right: 4px;
}

.component-list::-webkit-scrollbar {
    width: 4px;
}

.component-list::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 2px;
}

.component-list::-webkit-scrollbar-thumb {
    background: var(--secondary);
    border-radius: 2px;
}

.component-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.component-item:hover {
    background: var(--light-gray);
}

.component-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--secondary);
    cursor: pointer;
}

.component-item label {
    flex: 1;
    cursor: pointer;
    font-size: 0.875rem;
    user-select: none;
}

.focus-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--medium-gray);
    background: transparent;
    color: var(--medium-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.7rem;
}

.focus-btn:hover {
    border-color: var(--secondary);
    color: var(--secondary);
    transform: scale(1.1);
}

.effects {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.25rem;
}

.effect-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.effect-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--secondary);
    cursor: pointer;
}

.effect-item label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    user-select: none;
}

.effect-item i {
    color: var(--secondary);
    width: 18px;
    font-size: 0.875rem;
}

.control-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.ctrl-btn {
    padding: 0.5rem;
    border: 2px solid var(--light-gray);
    background: var(--white);
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.ctrl-btn:hover {
    border-color: var(--secondary);
    background: var(--secondary);
    color: var(--white);
    transform: translateY(-2px);
}

.ctrl-btn i {
    font-size: 1rem;
}

.ctrl-btn span {
    font-size: 0.7rem;
    font-weight: 500;
}

/* Component Details */
.component-details {
    grid-area: details;
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
}

.details-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--light-gray);
}

.details-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    color: var(--primary);
    font-size: 1.125rem;
}

.details-header h3 i {
    font-size: 1rem;
}

.details-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--medium-gray);
    background: transparent;
    color: var(--medium-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.nav-btn:hover {
    border-color: var(--secondary);
    color: var(--secondary);
    transform: scale(1.1);
}

.details-content {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-md);
}

.detail-view {
    min-height: 200px;
}

.empty-detail {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--dark-gray);
    text-align: center;
    padding: var(--space-md);
}

.empty-detail i {
    font-size: 2.5rem;
    color: var(--medium-gray);
    margin-bottom: var(--space-sm);
}

.empty-detail h4 {
    color: var(--primary);
    margin-bottom: var(--space-sm);
    font-size: 1.125rem;
}

.empty-detail p {
    color: var(--dark-gray);
    margin-bottom: 0;
    font-size: 0.9375rem;
}

.specs {
    background: var(--light-gray);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
}

.specs h5 {
    color: var(--primary);
    margin-bottom: var(--space-sm);
    font-size: 1rem;
}

.spec-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    padding: 0.25rem 0;
}

.spec-label {
    color: var(--dark-gray);
    font-weight: 500;
}

.spec-value {
    color: var(--text);
    text-align: right;
    font-weight: 500;
}

/* ===== COMPONENTS DETAIL SECTION ===== */
.components-detail {
    max-width: 1400px;
    margin: 0 auto;
}

.component-selection {
    margin-bottom: var(--space-md);
}

.comp-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.comp-tab {
    padding: 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--medium-gray);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.comp-tab:hover {
    background: rgba(0, 180, 216, 0.1);
    border-color: var(--secondary);
    color: var(--secondary);
}

.comp-tab.active {
    background: var(--secondary);
    border-color: var(--secondary);
    color: var(--white);
}

.comp-tab i {
    font-size: 1rem;
}

.comp-tab span {
    font-weight: 500;
}

.component-detail-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    background: var(--dark-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.detail-3d-viewer {
    position: relative;
    min-height: 350px;
    background: rgba(0, 0, 0, 0.3);
}

.detail-3d-container {
    width: 100%;
    height: 100%;
    min-height: 350px;
    position: relative;
}

.detail-loading {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--medium-gray);
}

.detail-loading i {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    color: var(--secondary);
}

.detail-loading p {
    font-size: 0.9375rem;
    margin: 0;
}

.detail-3d-controls {
    position: absolute;
    bottom: 0.75rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.8);
    padding: 0.4rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.detail-3d-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.detail-3d-btn:hover {
    background: var(--secondary);
    transform: scale(1.1);
}

.component-info {
    padding: var(--space-md);
    overflow-y: auto;
    max-height: 350px;
}

.component-info h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.comp-subtitle {
    color: var(--secondary);
    margin-bottom: var(--space-md);
    font-size: 1rem;
    font-weight: 500;
}

.comp-specs {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    margin-bottom: var(--space-md);
}

.comp-specs .spec-item {
    display: flex;
    justify-content: space-between;
    padding: 0.4rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
}

.comp-specs .spec-item:last-child {
    border-bottom: none;
}

.comp-specs .spec-label {
    color: var(--medium-gray);
    font-weight: 500;
}

.comp-specs .spec-value {
    color: var(--white);
    text-align: right;
}

.comp-description h4 {
    color: var(--white);
    margin: var(--space-sm) 0 var(--space-xs);
    font-size: 1rem;
}

.comp-description ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--space-md);
}

.comp-description li {
    padding: 0.2rem 0;
    padding-left: 1.25rem;
    position: relative;
    color: var(--medium-gray);
    font-size: 0.875rem;
}

.comp-description li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary);
    font-weight: bold;
}

.comp-description p {
    color: var(--medium-gray);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--space-sm);
}

/* ===== PROCESS TIMELINE ===== */
.process-timeline {
    max-width: 1000px;
    margin: 0 auto;
}

.timeline {
    position: relative;
    padding-left: 1.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0.75rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--secondary);
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-lg);
    padding-left: 1.5rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -0.75rem;
    top: 1.25rem;
    width: 0.75rem;
    height: 0.75rem;
    background: var(--secondary);
    border-radius: 50%;
    border: 3px solid var(--dark-bg);
    z-index: 1;
}

.timeline-item.active::before {
    background: var(--accent);
    box-shadow: 0 0 0 3px rgba(72, 202, 228, 0.3);
}

.timeline-icon {
    position: absolute;
    left: -2.5rem;
    top: 0.75rem;
    width: 2rem;
    height: 2rem;
    background: var(--dark-surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
    font-size: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.timeline-item.active .timeline-icon {
    background: var(--secondary);
    color: var(--white);
}

.timeline-content {
    background: var(--dark-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-content {
    transform: translateX(8px);
    border-color: var(--secondary);
}

.timeline-content h3 {
    color: var(--white);
    margin-bottom: var(--space-sm);
    font-size: 1.125rem;
}

.timeline-content p {
    color: var(--medium-gray);
    margin-bottom: 0;
    font-size: 0.9375rem;
}

/* ===== TEAM MEMBERS SECTION ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.team-member {
    background: var(--dark-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.team-member:hover {
    transform: translateY(-8px);
    border-color: var(--secondary);
    box-shadow: 0 8px 20px rgba(0, 180, 216, 0.2);
}

.member-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
    color: var(--white);
    font-size: 2rem;
}

.team-member h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.member-role {
    color: var(--secondary);
    font-weight: 500;
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
}

.member-bio {
    color: var(--medium-gray);
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.member-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.skill {
    background: rgba(0, 180, 216, 0.1);
    color: var(--secondary);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 500;
}
/* ===== TEAM MEMBERS SECTION - UPDATED FOR AVATARS ===== */
.team-member {
    background: var(--dark-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.team-member:hover {
    transform: translateY(-8px);
    border-color: var(--secondary);
    box-shadow: 0 8px 20px rgba(0, 180, 216, 0.2);
}

.member-avatar {
    width: 100px; /* Tăng kích thước */
    height: 100px;
    margin: 0 auto var(--space-md);
    position: relative;
}

.avatar-image {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover; /* Quan trọng: giữ tỷ lệ ảnh */
    border: 3px solid var(--secondary);
    box-shadow: 0 4px 12px rgba(0, 180, 216, 0.3);
    transition: all var(--transition-normal);
}

.team-member:hover .avatar-image {
    border-color: var(--accent);
    box-shadow: 0 6px 18px rgba(72, 202, 228, 0.4);
    transform: scale(1.05);
}

/* Fallback nếu không có ảnh */
.member-avatar i {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2.5rem; /* Tăng kích thước icon */
    border: 3px solid var(--secondary);
}

.team-member h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.member-role {
    color: var(--secondary);
    font-weight: 500;
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
}

.member-bio {
    color: var(--medium-gray);
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.member-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.skill {
    background: rgba(0, 180, 216, 0.1);
    color: var(--secondary);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 500;
}

/* Responsive cho avatar */
@media (max-width: 768px) {
    .member-avatar {
        width: 80px;
        height: 80px;
    }
    
    .member-avatar i {
        font-size: 2rem;
    }
}

/* ===== APPLICATIONS SECTION ===== */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

.app-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border-top: 3px solid;
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.app-card.neurology {
    border-color: #8E44AD;
}

.app-card.musculoskeletal {
    border-color: #E67E22;
}

.app-card.oncology {
    border-color: #E74C3C;
}

.app-card.cardiology {
    border-color: #27AE60;
}

.app-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.neurology .app-icon { background: #8E44AD; }
.musculoskeletal .app-icon { background: #E67E22; }
.oncology .app-icon { background: #E74C3C; }
.cardiology .app-icon { background: #27AE60; }

.app-card h3 {
    margin-bottom: var(--space-sm);
    font-size: 1.25rem;
}

.app-card ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.app-card li {
    padding: 0.2rem 0;
    padding-left: 1.25rem;
    position: relative;
    font-size: 0.875rem;
    color: var(--dark-gray);
}

.app-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: inherit;
}

.neurology li::before { color: #8E44AD; }
.musculoskeletal li::before { color: #E67E22; }
.oncology li::before { color: #E74C3C; }
.cardiology li::before { color: #27AE60; }

/* ===== FOOTER ===== */
.footer {
    background: var(--dark-bg);
    color: var(--dark-text);
    padding: var(--space-lg) 0 0;
    margin-top: var(--space-lg);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--space-sm);
    font-size: 1.125rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-sm);
}

.footer-logo i {
    color: var(--secondary);
    font-size: 2rem;
}

.footer-description {
    color: var(--medium-gray);
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--medium-gray);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--secondary);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tech-item {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 500;
}

.footer-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.footer-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--medium-gray);
    background: transparent;
    color: var(--medium-gray);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.footer-btn:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

.footer-bottom {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--space-sm);
    text-align: center;
}

.footer-bottom p {
    margin-bottom: 0.4rem;
    color: var(--medium-gray);
    font-size: 0.75rem;
}

.disclaimer {
    font-size: 0.7rem !important;
    color: rgba(255, 255, 255, 0.5) !important;
    line-height: 1.4;
}

/* ===== UPDATED FOOTER ===== */
.footer-references {
    grid-column: 1 / -1;
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.references-section {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
}

.references-section h4 {
    margin-bottom: var(--space-sm);
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.references-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-sm);
}

.reference-item {
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
}

.ref-title {
    color: var(--white);
    font-weight: 500;
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
    line-height: 1.4;
}

.ref-authors {
    color: var(--medium-gray);
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.ref-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.75rem;
    transition: color var(--transition-fast);
}

.ref-link:hover {
    color: var(--accent);
    text-decoration: underline;
}

.ref-link i {
    font-size: 0.7rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1200px) {
    .mri-3d-section {
        grid-template-columns: 280px 1fr;
        grid-template-rows: 320px auto;
    }
    
    .details-content {
        grid-template-columns: 1fr;
    }
    
    .component-detail-view {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 992px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 100px;
        min-height: auto;
    }
    
    .hero-content {
        max-width: 100%;
        margin-bottom: var(--space-lg);
    }
    
    .hero-3d-preview {
        height: 350px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .physics-content {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .mri-3d-section {
        grid-template-areas:
            "viewer"
            "controls"
            "details";
        grid-template-columns: 1fr;
        grid-template-rows: 280px auto auto;
    }
    
    .component-detail-view {
        grid-template-columns: 1fr;
        grid-template-rows: 300px auto;
    }
    
    .detail-3d-viewer {
        min-height: 300px;
    }
    
    .detail-3d-container {
        min-height: 300px;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-md);
        box-shadow: var(--shadow-md);
        z-index: 1000;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: var(--space-md) 0;
    }
    
    .section-header {
        margin-bottom: var(--space-md);
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .btn-primary, .btn-secondary {
        padding: 0.75rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    .simulation-info {
        grid-template-columns: 1fr;
    }
    
    .viewer-header {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
        padding: var(--space-sm);
    }
    
    .viewer-stats {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .mri-3d-section {
        grid-template-rows: 240px auto auto;
    }
    
    .viewer-container {
        height: 220px;
    }
    
    .controls-panel {
        padding: var(--space-sm);
    }
    
    .component-details {
        padding: var(--space-sm);
    }
    
    .details-content {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .component-detail-view {
        grid-template-rows: 250px auto;
    }
    
    .detail-3d-viewer {
        min-height: 250px;
    }
    
    .detail-3d-container {
        min-height: 250px;
    }
    
    .comp-nav {
        flex-direction: column;
        align-items: center;
    }
    
    .comp-tab {
        width: 100%;
        max-width: 280px;
        justify-content: center;
        padding: 0.6rem 1rem;
    }
    
    .references-list {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--space-md);
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
    }
    
    .overview-grid {
        grid-template-columns: 1fr;
    }
    
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .control-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .view-modes {
        grid-template-columns: 1fr;
    }
    
    .member-avatar {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }
    
    .team-member h3 {
        font-size: 1.125rem;
    }
    
    .mri-3d-section {
        grid-template-rows: 220px auto auto;
    }
    
    .viewer-container {
        height: 200px;
    }
    
    .viewer-hints {
        display: none;
    }
    
    .component-detail-view {
        grid-template-rows: 220px auto;
    }
    
    .detail-3d-viewer {
        min-height: 220px;
    }
    
    .detail-3d-container {
        min-height: 220px;
    }
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

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

/* Smooth scroll padding */
html {
    scroll-padding-top: 70px;
}