/* Design System Variables */
:root {
    --bg-primary: #f4f5f7;
    --bg-secondary: #ffffff;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    
    --primary: hsl(174, 72%, 45%);
    --primary-hover: hsl(174, 72%, 38%);
    --accent: hsl(145, 63%, 42%);
    --accent-hover: hsl(145, 63%, 35%);
    
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(17, 24, 39, 0.08);
    --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    
    --border-color: rgba(17, 24, 39, 0.08);
    --input-bg: rgba(255, 255, 255, 0.9);
    
    --transition-speed: 0.3s;
    --radius-lg: 16px;
    --radius-md: 8px;
}

/* System Preference: Dark Mode Overrides */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0b0c0e;
        --bg-secondary: #121417;
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
        
        --card-bg: rgba(18, 20, 23, 0.7);
        --card-border: rgba(255, 255, 255, 0.08);
        --card-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
        
        --border-color: rgba(255, 255, 255, 0.08);
        --input-bg: rgba(18, 20, 23, 0.9);
    }
}

/* Reset & Global Elements */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Alegreya', Georgia, serif;
    font-size: 1.15rem;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

h1, h2, h3, h4, h5 {
    font-family: 'Belleza', Helvetica, sans-serif;
    font-weight: normal;
    color: var(--text-primary);
    line-height: 1.25;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--accent);
}

/* Glassmorphism card template */
.glass {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'Belleza', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-speed), transform 0.2s, box-shadow var(--transition-speed);
    border: none;
    outline: none;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(20, 184, 166, 0.25);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 20px rgba(20, 184, 166, 0.4);
    color: #ffffff;
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: rgba(17, 24, 39, 0.05);
}

@media (prefers-color-scheme: dark) {
    .btn-secondary:hover {
        background-color: rgba(255, 255, 255, 0.05);
    }
}

.btn-large {
    padding: 0.8rem 1.6rem;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

/* Nav bar Layout */
.navbar {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(var(--bg-primary), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    transition: background var(--transition-speed);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-logo {
    height: 32px;
    display: block;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-item {
    font-family: 'Belleza', sans-serif;
    color: var(--text-secondary);
    font-size: 1.05rem;
    font-weight: 500;
}

.nav-item:hover {
    color: var(--primary);
}

/* Hero Section */
.hero {
    padding: 6rem 0 4rem 0;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.15;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

/* Hero preview widget */
.hero-preview {
    display: flex;
    justify-content: center;
    align-items: center;
}

.preview-card {
    width: 100%;
    max-width: 380px;
    padding: 1.5rem;
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 6px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.8rem;
    margin-bottom: 1rem;
}

.preview-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot-red { background-color: #ef4444; }
.dot-yellow { background-color: #eab308; }
.dot-green { background-color: #22c55e; }

.preview-title {
    font-family: 'Belleza', sans-serif;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-left: 6px;
}

.hub-metric {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 0.5rem;
}

.hub-val {
    font-family: 'Belleza', sans-serif;
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary);
}

.hub-unit {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hub-heart-icon {
    color: #ef4444;
    font-size: 1.2rem;
    margin-left: auto;
    animation: pulse 1.5s infinite;
}

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

.hub-chart {
    height: 80px;
    margin: 1rem 0;
}

.sparkline {
    width: 100%;
    height: 100%;
}

.hub-activity {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.activity-circle {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.progress-ring {
    transform: rotate(-90deg);
}

.activity-lbl {
    font-family: 'Belleza', sans-serif;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Sections Global */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-tagline {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.15rem;
    margin-bottom: 3.5rem;
}

/* Features Grid */
.features-section {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

@media (prefers-color-scheme: dark) {
    .feature-card:hover {
        box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
}

.card-icon-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-icon-header h3 {
    font-size: 1.4rem;
}

.teal-icon {
    color: var(--primary);
    flex-shrink: 0;
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.logo-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: auto;
}

.source-logo {
    height: 24px;
    width: auto;
    object-fit: contain;
    border-radius: 4px;
}

.sync-badge {
    margin-top: 0.5rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
}

.status-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent);
    animation: blink 2s infinite;
}

@keyframes blink {
    0% { opacity: 0.4; }
    50% { opacity: 1; }
    100% { opacity: 0.4; }
}

.timeline-visual {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    border-left: 2px solid var(--border-color);
    padding-left: 1rem;
    margin-left: 6px;
}

.timeline-item {
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: -21px;
    top: 6px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--primary);
}

.timeline-text {
    font-size: 0.85rem;
}

.timeline-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: bold;
}

.timeline-text p {
    color: var(--text-primary);
    font-weight: 500;
}

.chart-flex {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.radial-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.radial-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.radial-container svg {
    transform: rotate(-90deg);
}

.radial-text {
    position: absolute;
    font-size: 0.75rem;
    font-family: 'Belleza', sans-serif;
    font-weight: bold;
}

.radial-lbl {
    font-family: 'Belleza', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
}

.radial-sub {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.chat-preview-widget {
    margin-top: auto;
    background: rgba(17, 24, 39, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

@media (prefers-color-scheme: dark) {
    .chat-preview-widget {
        background: rgba(255, 255, 255, 0.03);
    }
}

.msg {
    font-size: 0.85rem;
    padding: 0.5rem 0.8rem;
    border-radius: 12px;
    max-width: 85%;
}

.bubble-user {
    background: rgba(20, 184, 166, 0.1);
    color: var(--text-primary);
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

.bubble-ai {
    background: var(--bg-primary);
    color: var(--text-secondary);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
}

/* How It Works Grid */
.how-it-works-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.steps-container {
    padding: 3rem;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
}

.step-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
}

.step-num {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Belleza', sans-serif;
    font-size: 1.4rem;
    box-shadow: 0 4px 10px rgba(20, 184, 166, 0.2);
}

.step-card h4 {
    font-size: 1.3rem;
}

.step-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.step-logos {
    display: flex;
    gap: 6px;
    margin-top: 0.5rem;
}

.mini-logo {
    height: 16px;
    width: auto;
    object-fit: contain;
}

.step-visual {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
}

.step-divider {
    width: 2px;
    align-self: stretch;
    background-color: var(--border-color);
}

/* Resources section */
.resources-section {
    padding: 5rem 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.resource-card {
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-align: left;
}

.hover-effect:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.res-icon {
    margin-bottom: 0.5rem;
}

.resource-card h3 {
    font-size: 1.4rem;
}

.resource-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.card-action-link {
    font-family: 'Belleza', sans-serif;
    color: var(--primary);
    font-weight: 500;
    margin-top: auto;
    display: inline-block;
}

.cursor-pointer {
    cursor: pointer;
}

/* Contact Section */
.contact-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.max-w-small {
    max-width: 650px !important;
}

.contact-card {
    padding: 3rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.form-group label {
    font-family: 'Belleza', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-family: 'Alegreya', serif;
    font-size: 1.05rem;
    outline: none;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.15);
}

.form-feedback {
    margin-top: 1rem;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
}

.feedback-success {
    color: var(--accent);
}

.feedback-error {
    color: #ef4444;
}

/* Footer styling */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    text-align: center;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.footer-sub {
    font-size: 0.85rem !important;
}

/* Modals overlays */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-box {
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transform: translateY(20px);
    transition: transform var(--transition-speed);
}

.modal-overlay.active .modal-box {
    transform: translateY(0);
}

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

.modal-header h3 {
    font-size: 1.6rem;
    color: var(--primary);
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-speed);
}

.modal-close:hover {
    color: var(--primary);
}

.scrollable-y {
    overflow-y: auto;
}

.modal-body {
    padding-right: 0.5rem;
    font-size: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Styling for Modal Scrollbars */
.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.modal-body h4 {
    font-size: 1.15rem;
    font-weight: bold;
    color: var(--text-secondary);
}

.modal-body h5 {
    font-size: 1.15rem;
    font-weight: bold;
    margin-top: 0.5rem;
}

/* Responsive Overrides */
@media (max-width: 991px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .steps-container {
        flex-direction: column;
        align-items: center;
        padding: 2rem;
    }
    
    .step-divider {
        width: 100%;
        height: 2px;
    }
}

@media (max-width: 767px) {
    .nav-menu {
        display: none;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .contact-card {
        padding: 1.8rem;
    }
    
    .modal-box {
        padding: 1.5rem;
        width: 95%;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
}

/* Metric Goals & Health Documents Cards */
.goals-visual {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.goal-item-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.goal-label {
    font-family: 'Belleza', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.goal-range-bar {
    display: flex;
    align-items: center;
    gap: 8px;
}

.range-marker {
    font-size: 0.7rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.range-track {
    flex-grow: 1;
    height: 4px;
    background-color: var(--border-color);
    position: relative;
    border-radius: 2px;
}

.range-fill {
    position: absolute;
    height: 100%;
    background: linear-gradient(to right, var(--primary), var(--accent));
    border-radius: 2px;
}

.fill-steps {
    left: 20%;
    width: 60%;
}

.fill-sleep {
    left: 15%;
    width: 55%;
}

.range-thumb {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: var(--accent);
    border: 2px solid var(--bg-secondary);
    border-radius: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.thumb-steps {
    left: 55%;
}

.thumb-sleep {
    left: 50%;
}

/* Docs visual */
.docs-visual {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.doc-badge-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(17, 24, 39, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.6rem 0.8rem;
}

@media (prefers-color-scheme: dark) {
    .doc-badge-item {
        background: rgba(255, 255, 255, 0.03);
    }
}

.doc-icon {
    color: var(--primary);
    flex-shrink: 0;
}

.doc-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 8px;
}

.doc-name {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.doc-tag {
    font-size: 0.65rem;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag-radiology {
    background-color: rgba(20, 184, 166, 0.1);
    color: var(--primary);
}

.tag-vaccine {
    background-color: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

/* Enforce 3 columns on desktop for visual balance */
@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}