/* ==========================================================================
   Μικροβιολογικό Εργαστήριο Σαμπάνης Ευάγγελος
   Mobile-First Responsive CSS
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Variables)
   -------------------------------------------------------------------------- */
:root {
    /* Colors - Professional Medical Palette - Serious & Trustworthy */
    --color-primary: #1a5276;
    --color-primary-dark: #0e3a53;
    --color-primary-light: #eaf2f8;
    --color-secondary: #1e8449;
    --color-accent: #c0392b;
    
    /* Neutral Colors - Higher Contrast for Readability */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-500: #6b7280;
    --color-gray-700: #374151;
    --color-gray-900: #111827;
    --color-black: #000000;
    
    /* Typography - Larger for Older Users */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-heading: var(--font-primary);
    
    /* Font Sizes - Larger for Better Readability */
    --font-size-xs: 0.875rem;   /* 14px */
    --font-size-sm: 1rem;       /* 16px */
    --font-size-base: 1.125rem; /* 18px - larger base */
    --font-size-lg: 1.25rem;    /* 20px */
    --font-size-xl: 1.5rem;     /* 24px */
    --font-size-2xl: 1.75rem;   /* 28px */
    --font-size-3xl: 2rem;      /* 32px */
    --font-size-4xl: 2.5rem;    /* 40px */
    --font-size-5xl: 3rem;      /* 48px */
    
    /* Line Heights - More Relaxed for Readability */
    --line-height-tight: 1.3;
    --line-height-normal: 1.7;
    --line-height-relaxed: 1.9;
    
    /* Spacing - Larger Touch Targets */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 2rem;
    --spacing-xl: 2.5rem;
    --spacing-2xl: 3.5rem;
    --spacing-3xl: 5rem;
    
    /* Border Radius - More Conservative/Professional */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-full: 9999px;
    
    /* Shadows - Subtle */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Container */
    --container-max-width: 1100px;
    --container-padding: var(--spacing-md);
    
    /* Header Height */
    --header-height: 80px;
}

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

html {
    font-size: 100%;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    /* Better text rendering */
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-gray-900);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Accessibility - Focus Styles */
:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 100;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-gray-900);
}

h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-md);
}

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

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

/* --------------------------------------------------------------------------
   Images
   -------------------------------------------------------------------------- */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    flex-shrink: 0;
}

/* Navigation */
.main-nav {
    display: flex;
    align-items: center;
}

.menu-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-900);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-900);
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
    list-style: none;
}

.nav-menu.is-active {
    display: block;
}

.nav-menu li {
    border-bottom: 1px solid var(--color-gray-200);
}

.nav-menu a {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-gray-900);
    font-weight: 500;
}

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

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */
#main-content {
    padding-top: var(--header-height);
}

/* --------------------------------------------------------------------------
   Sections Base Styles
   -------------------------------------------------------------------------- */
section {
    padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero-section {
    background-color: var(--color-primary-light);
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.hero-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-lg);
}

.hero-contact-info {
    background-color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    display: inline-block;
}

.hero-contact-info p {
    margin-bottom: var(--spacing-xs);
}

.hero-phones {
    font-size: var(--font-size-lg);
}

.click-to-call {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.click-to-call:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.click-to-email {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.click-to-email:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.address-link {
    color: var(--color-gray-700);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.address-link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.hero-email {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xs);
}

.hero-results {
    color: var(--color-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
}

.hero-hours {
    margin-bottom: var(--spacing-xl);
}

.hero-hours p {
    margin-bottom: var(--spacing-xs);
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-decoration: none;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    min-width: 220px;
    min-height: 52px;
    line-height: 1.4;
    /* Better touch target for mobile */
    -webkit-tap-highlight-color: transparent;
}

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

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

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

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

/* Services Section */
.services-section {
    background-color: var(--color-white);
}

.section-intro {
    font-size: var(--font-size-lg);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.services-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.service-card {
    background-color: var(--color-gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
    border-left: 4px solid var(--color-primary);
}

.service-card:hover {
    box-shadow: var(--shadow-md);
}

.service-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.service-card ul {
    list-style: none;
    padding: 0;
}

.service-card li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-gray-700);
}

.service-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

/* Preparation Section */
.preparation-section {
    background-color: var(--color-primary-light);
}

.preparation-list {
    list-style: none;
    padding: 0;
    max-width: 700px;
    margin: var(--spacing-xl) auto;
}

.preparation-list li {
    padding: var(--spacing-md);
    padding-left: var(--spacing-2xl);
    position: relative;
    background-color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.preparation-list li::before {
    content: "📋";
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
}

.preparation-note {
    text-align: center;
    color: var(--color-gray-700);
    font-style: italic;
    margin-top: var(--spacing-lg);
}

/* About Section */
.about-section {
    background-color: var(--color-gray-50);
}

.about-content {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.about-image {
    text-align: center;
}

.doctor-photo {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
    display: block;
    object-fit: cover;
    aspect-ratio: 2/3;
}

.image-caption {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-gray-700);
    text-align: center;
    font-weight: 500;
}

.image-caption small {
    display: block;
    color: var(--color-primary);
    font-weight: 400;
}

.about-text h3 {
    color: var(--color-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.bio-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

.bio-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.bio-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

/* Contact Section */
.contact-section {
    background-color: var(--color-white);
}

/* Laboratory Photo */
.laboratory-photo-container {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.laboratory-photo {
    width: 100%;
    max-width: 800px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
    display: block;
    object-fit: cover;
}

.contact-grid {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.contact-info address {
    font-style: normal;
    margin-bottom: var(--spacing-md);
}

.contact-info p {
    margin-bottom: var(--spacing-sm);
}

.contact-details {
    margin-bottom: var(--spacing-lg);
}

.opening-hours ul {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-sm);
}

.opening-hours li {
    padding: var(--spacing-xs) 0;
}

.contact-map {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.contact-map iframe {
    display: block;
}

.map-caption {
    text-align: center;
    padding: var(--spacing-sm);
    background-color: var(--color-gray-50);
    font-size: var(--font-size-sm);
}

.map-caption a {
    color: var(--color-primary);
    text-decoration: none;
}

.map-caption a:hover {
    text-decoration: underline;
}

.contact-actions {
    margin-top: var(--spacing-lg);
}

.btn-directions {
    display: inline-block;
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-directions:hover {
    background-color: #008855;
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-info p {
    margin-bottom: var(--spacing-xs);
}

.footer-brand {
    font-size: var(--font-size-lg);
    color: var(--color-white);
    margin-bottom: var(--spacing-sm) !important;
}

.footer-info a {
    color: var(--color-gray-300);
}

.footer-info a:hover {
    color: var(--color-white);
}

.footer-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-nav a {
    color: var(--color-gray-300);
}

.footer-nav a:hover {
    color: var(--color-white);
}

.footer-legal {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.legal-notice,
.privacy-notice {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-sm);
}

.footer-bottom {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: var(--font-size-sm);
}

/* Logo Styles */
.logo a {
    text-decoration: none;
    color: var(--color-gray-900);
}

.logo-text {
    font-size: var(--font-size-sm);
    line-height: 1.3;
}

.logo-text strong {
    color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Back to Top Button
   -------------------------------------------------------------------------- */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 44px;
    height: 44px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
}

.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

/* --------------------------------------------------------------------------
   Mobile Optimizations
   -------------------------------------------------------------------------- */

/* Larger touch targets for mobile */
a, button {
    min-height: 44px;
    min-width: 44px;
}

/* Better tap feedback */
a:active, button:active {
    opacity: 0.8;
}

/* Prevent horizontal scroll */
html, body {
    overflow-x: hidden;
}

/* Better spacing for mobile readability */
.click-to-call,
.click-to-email,
.address-link {
    display: inline-block;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-lg);
}

/* Larger phone numbers for easy tapping */
.hero-phones .click-to-call {
    font-size: var(--font-size-xl);
    padding: var(--spacing-sm) var(--spacing-xs);
}

/* Better list readability */
ul, ol {
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-sm);
}

/* --------------------------------------------------------------------------
   Media Queries - Tablet (768px+)
   -------------------------------------------------------------------------- */
@media screen and (min-width: 768px) {
    :root {
        --container-padding: var(--spacing-lg);
    }
    
    h1 {
        font-size: var(--font-size-4xl);
    }
    
    h2 {
        font-size: var(--font-size-3xl);
    }
    
    .menu-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex;
        position: static;
        box-shadow: none;
        gap: var(--spacing-md);
    }
    
    .nav-menu li {
        border-bottom: none;
    }
    
    .nav-menu a {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .hero-cta {
        flex-direction: row;
        justify-content: center;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
    
    .doctor-photo {
        max-width: 280px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-content {
        grid-template-columns: 2fr 1fr;
    }
    
    .logo-text {
        font-size: var(--font-size-base);
    }
}

/* --------------------------------------------------------------------------
   Media Queries - Desktop (1024px+)
   -------------------------------------------------------------------------- */
@media screen and (min-width: 1024px) {
    :root {
        --container-padding: var(--spacing-xl);
    }
    
    h1 {
        font-size: var(--font-size-5xl);
    }
    
    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    section {
        padding: var(--spacing-3xl) 0;
    }
    
    .hero-section {
        padding: var(--spacing-3xl) 0;
    }
    
    .about-content {
        grid-template-columns: 300px 1fr;
        align-items: start;
    }
    
    .about-image {
        position: sticky;
        top: calc(var(--header-height) + var(--spacing-xl));
    }
    
    .doctor-photo {
        max-width: 100%;
    }
    
    .laboratory-photo {
        max-width: 900px;
    }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    .site-header,
    .back-to-top,
    .menu-toggle {
        display: none;
    }
    
    #main-content {
        padding-top: 0;
    }
    
    body {
        font-size: 12pt;
        color: #000;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
}