/* Medissist Style Sheet - Clinical Design System */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
    --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Color Palette - Medical Teal & Slate theme (Light Mode default) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --primary: #0d9488;
    --primary-hover: #0f766e;
    --primary-light: #ccfbf1;
    --secondary: #0284c7;
    --secondary-hover: #0369a1;
    --secondary-light: #e0f2fe;
    
    --accent: #f59e0b;
    --accent-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #6b7280;
    
    --primary: #14b8a6;
    --primary-hover: #2dd4bf;
    --primary-light: #115e59;
    --secondary: #0ea5e9;
    --secondary-hover: #38bdf8;
    --secondary-light: #075985;
    
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

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

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

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

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

[data-theme="dark"] header {
    background-color: rgba(11, 15, 25, 0.8);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.logo svg {
    width: 28px;
    height: 28px;
    fill: currentColor;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-sm);
}

.nav-links a:hover, 
.nav-links a.active {
    color: var(--primary);
    background-color: var(--primary-light);
}

[data-theme="dark"] .nav-links a:hover,
[data-theme="dark"] .nav-links a.active {
    color: var(--primary-hover);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.theme-toggle-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary);
}

/* Main Layout */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    min-height: calc(100vh - 200px);
}

.page {
    display: none;
    animation: fadeIn 0.5s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    padding: 3rem 0;
}

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
}

.hero-content h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.hero-content h1 span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
}

@media (max-width: 768px) {
    .cta-buttons {
        justify-content: center;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
    border: none;
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

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

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

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-2px);
}

/* Image Placeholder Style (Requested: leave empty, styled block) */
.image-placeholder {
    width: 100%;
    aspect-ratio: 16/10;
    background: repeating-linear-gradient(
        45deg,
        var(--bg-secondary),
        var(--bg-secondary) 10px,
        var(--bg-tertiary) 10px,
        var(--bg-tertiary) 20px
    );
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.image-placeholder svg {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    stroke: var(--text-muted);
    stroke-width: 1.5;
}

.image-placeholder-label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.image-placeholder-sub {
    font-size: 0.875rem;
}

/* Crisis in German Healthcare Section */
.crisis-section {
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
}

.section-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--danger-light);
    color: var(--danger);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

[data-theme="dark"] .section-tag {
    color: #fca5a5;
}

.section-tag.solution {
    background-color: var(--primary-light);
    color: var(--primary);
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 800px;
}

.crisis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    position: relative;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.card-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon.crisis {
    background-color: var(--danger-light);
    color: var(--danger);
}

.card-icon.solution {
    background-color: var(--primary-light);
    color: var(--primary);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

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

/* Systemic Overload Banner */
.banner {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 3rem;
    margin-top: 4rem;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: center;
}

@media (max-width: 768px) {
    .banner {
        grid-template-columns: 1fr;
        padding: 2rem;
    }
}

.banner h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.banner p {
    color: #cbd5e1;
    margin-bottom: 1rem;
}

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

.stat-item {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-num {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-desc {
    font-size: 0.85rem;
    color: #cbd5e1;
}

/* Solutions Section */
.solutions-section {
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
}

/* Use Cases - Interactive Switcher */
.use-cases-section {
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
}

.use-case-switcher {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.switcher-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.switcher-btn.active, .switcher-btn:hover {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.use-case-display {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .use-case-display {
        grid-template-columns: 1fr;
        padding: 2rem;
    }
}

.use-case-details h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.use-case-details p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.use-case-benefit {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--primary);
}

/* Architectural Innovation */
.architecture-section {
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
}

.arch-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 900px) {
    .arch-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.arch-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.arch-item {
    display: flex;
    gap: 1rem;
}

.arch-bullet {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.8rem;
    font-weight: 700;
}

.arch-text h4 {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

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

/* References Section */
.references-section {
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.references-section h4 {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.ref-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 2rem;
}

@media (max-width: 768px) {
    .ref-list {
        grid-template-columns: 1fr;
    }
}

.ref-list li {
    line-height: 1.4;
}

/* Form Styles (Pilot Program) */
.form-container {
    max-width: 600px;
    margin: 3rem auto;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
    .form-container {
        padding: 2rem;
    }
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

.form-success {
    display: none;
    text-align: center;
    padding: 2rem;
    animation: fadeIn 0.5s ease;
}

.form-success-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
}

.form-success-icon svg {
    width: 32px;
    height: 32px;
}

/* Contact Details Page */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    margin-top: 3rem;
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-text h4 {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.contact-text p {
    color: var(--text-secondary);
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 2rem 2rem 2rem;
    margin-top: 5rem;
    transition: var(--transition);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.footer-info p {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 320px;
}

.footer-col h4 {
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-col a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    max-width: 1200px;
    margin: 3rem auto 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}