/* ========================================
   Daedalus Therapeutics - Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #0a4d68;
    --color-primary-dark: #083a4f;
    --color-primary-light: #0d6a8f;
    --color-secondary: #05b2dc;
    --color-accent: #00c9a7;
    --color-dark: #1a1a2e;
    --color-gray-900: #212529;
    --color-gray-700: #495057;
    --color-gray-500: #6c757d;
    --color-gray-300: #dee2e6;
    --color-gray-100: #f8f9fa;
    --color-white: #ffffff;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --nav-height: 80px;
    --container-max: 1200px;
    --section-padding: 100px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-gray-900);
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--color-primary-light);
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background-color: var(--color-white);
    color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo img {
    height: 28px;
    width: auto;
    transition: opacity var(--transition-base);
}

.logo-dark {
    display: none;
}

.logo-light {
    display: block;
}

.navbar.scrolled .logo-dark {
    display: block;
}

.navbar.scrolled .logo-light {
    display: none;
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: var(--color-white);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    position: relative;
    padding: 8px 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: currentColor;
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

.navbar.scrolled .nav-link {
    color: var(--color-gray-700);
}

.navbar.scrolled .nav-link:hover {
    color: var(--color-primary);
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    gap: 6px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-white);
    transition: all var(--transition-base);
}

.navbar.scrolled .nav-toggle span {
    background-color: var(--color-gray-700);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, #062a3a 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(5, 178, 220, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 201, 167, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
}

.hero h1 {
    color: var(--color-white);
    margin-bottom: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    color: rgba(255, 255, 255, 0.85);
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    font-weight: 400;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Sections */
.section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    margin-bottom: 16px;
}

.section-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 0 auto;
    border-radius: 2px;
}

/* About Section */
.about {
    background-color: var(--color-white);
}

.about-content {
    display: grid;
    gap: 60px;
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text .lead {
    font-size: 1.25rem;
    color: var(--color-gray-900);
    font-weight: 400;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.stat-card {
    background-color: var(--color-gray-100);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: all var(--transition-base);
}


.stat-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 12px;
}

.stat-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-white);
}

.stat-card h3 {
    font-size: 1.125rem;
    margin-bottom: 12px;
}

.stat-card p {
    color: var(--color-gray-500);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* Disease Section */
.disease {
    background-color: var(--color-gray-100);
}

.disease-intro {
    max-width: 800px;
    margin: 0 auto 50px;
    text-align: center;
}

.disease-intro h3 {
    color: var(--color-primary);
    margin-bottom: 20px;
}

.disease-intro p {
    font-size: 1.125rem;
    line-height: 1.8;
}

.disease-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.disease-card {
    background-color: var(--color-white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}


.disease-card h4 {
    color: var(--color-primary);
    margin-bottom: 16px;
    font-size: 1.125rem;
}

.disease-card p {
    color: var(--color-gray-700);
    margin-bottom: 0;
    line-height: 1.7;
}

/* Footer */
.footer {
    background-color: var(--color-dark);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
}

.footer-logo img {
    height: 36px;
    width: auto;
    opacity: 0.9;
}

.footer-text p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    margin-bottom: 4px;
}

.footer-tagline {
    font-size: 0.8125rem !important;
    color: rgba(255, 255, 255, 0.4) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --section-padding: 70px;
        --nav-height: 70px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        color: var(--color-gray-700);
        padding: 16px;
        display: block;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--color-gray-300);
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .hero-content {
        padding-top: 40px;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .disease-details {
        grid-template-columns: 1fr;
    }

}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .stat-card,
    .disease-card {
        padding: 30px 20px;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.875rem;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-overlay {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 40px 0;
        background: var(--color-gray-100);
    }

    .hero h1,
    .hero-subtitle {
        color: var(--color-gray-900);
    }

    .section {
        padding: 40px 0;
    }
}