/* ===========================
   brainYdoc - Calm & Professional Design System
   =========================== */

/* CSS Variables for Design Tokens */
:root {
    /* Colors - Calm, Trustworthy Palette */
    --color-primary: #2c5f8d;           /* Deep calm blue */
    --color-primary-light: #4a7ba7;
    --color-primary-dark: #1d4263;
    --color-secondary: #5a8ca8;
    --color-accent: #7ba7bc;
    
    /* Neutrals */
    --color-text: #2d3436;
    --color-text-light: #636e72;
    --color-text-lighter: #95a5a6;
    --color-bg: #ffffff;
    --color-bg-light: #f8f9fa;
    --color-bg-alt: #ecf0f1;
    --color-border: #dfe6e9;
    
    /* Semantic Colors */
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-error: #e74c3c;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: Georgia, 'Times New Roman', serif;
    
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    
    --line-height-base: 1.6;
    --line-height-heading: 1.2;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Layout */
    --container-width: 1200px;
    --container-padding: var(--space-lg);
    --border-radius: 8px;
    --border-radius-sm: 4px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
}

/* ===========================
   Reset & Base Styles
   =========================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-heading);
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--space-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.375rem; }
}

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

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

a:hover, a:focus {
    color: var(--color-primary-light);
    text-decoration: underline;
}

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

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

ul, ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xl);
}

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

li:last-child {
    margin-bottom: 0;
}

/* ===========================
   Layout Components
   =========================== */

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

.section {
    padding: var(--space-3xl) 0;
}

.section:nth-child(even) {
    background-color: var(--color-bg-light);
}

.section-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
}

/* ===========================
   Accessibility
   =========================== */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    z-index: 10000;
    border-radius: 0 0 var(--border-radius) 0;
}

.skip-link:focus {
    top: 0;
    text-decoration: none;
}

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

/* ===========================
   Header & Navigation
   =========================== */

.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

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

.nav-brand {
    flex-shrink: 0;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

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

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
    margin: 0;
    padding: 0;
    flex-wrap: nowrap;
}

.nav-list li {
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-list a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--space-sm) var(--space-xs);
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus {
    background-color: var(--color-bg-alt);
    color: var(--color-primary);
    text-decoration: none;
}

.btn-contact {
    background-color: var(--color-primary) !important;
    color: white !important;
    padding: var(--space-sm) var(--space-lg) !important;
    border-radius: var(--border-radius);
}

.btn-contact:hover,
.btn-contact:focus {
    background-color: var(--color-primary-light) !important;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: var(--space-xs);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--space-xs);
}

.lang-btn {
    background: none;
    border: none;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.lang-btn:hover,
.lang-btn:focus {
    background-color: var(--color-bg-alt);
    color: var(--color-text);
}

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

/* Mobile Navigation */
.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.hamburger,
.hamburger::before,
.hamburger::after {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

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

.hamburger::after {
    top: 8px;
}

@media (max-width: 992px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-lg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        transition: transform var(--transition-base), opacity var(--transition-base);
        pointer-events: none;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-list {
        flex-direction: column;
        width: 100%;
        gap: var(--space-sm);
    }
    
    .nav-list li {
        white-space: nowrap;
    }
    
    .nav-list a {
        display: block;
        width: 100%;
    }
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
    padding: var(--space-3xl) 0;
    text-align: center;
}

.hero-title {
    font-size: 2.75rem;
    color: white;
    margin-bottom: var(--space-lg);
    line-height: 1.15;
}

.hero-description {
    font-size: var(--font-size-xl);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
    opacity: 0.95;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Add border to primary button in hero for better visibility on blue background */
.hero .btn-primary {
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.hero .btn-primary:hover,
.hero .btn-primary:focus {
    border-color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .hero {
        padding: var(--space-2xl) 0;
    }
    
    .hero-title {
        font-size: 1.875rem;
    }
    
    .hero-description {
        font-size: var(--font-size-base);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: center;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    line-height: 1.5;
}

.btn:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-bg-alt);
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-lg);
}

@media (max-width: 768px) {
    .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* ===========================
   Cards & Grids
   =========================== */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.card {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.card ul {
    list-style-position: inside;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    align-items: start;
}

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

.content-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.content-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
}

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

/* Timeline */
.timeline {
    list-style: none;
    padding: 0;
}

.timeline li {
    padding: var(--space-sm) 0;
    border-left: 2px solid var(--color-primary);
    padding-left: var(--space-md);
    margin-left: var(--space-md);
    position: relative;
}

.timeline li::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 12px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-primary);
}

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

/* ===========================
   News & Blog
   =========================== */

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.news-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: var(--space-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news-card time {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-lighter);
    margin-bottom: var(--space-sm);
}

.news-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-md);
}

.news-card p {
    color: var(--color-text-light);
}

.read-more {
    color: var(--color-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.read-more::after {
    content: '→';
    transition: transform var(--transition-fast);
}

.read-more:hover::after {
    transform: translateX(4px);
}

/* ===========================
   Contact Section
   =========================== */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-2xl);
}

@media (max-width: 992px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

.contact-info {
    background: var(--color-bg-light);
    padding: var(--space-xl);
    border-radius: var(--border-radius);
}

.info-block {
    margin-bottom: var(--space-xl);
}

.info-block h4 {
    color: var(--color-primary);
    font-size: var(--font-size-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.info-block address {
    font-style: normal;
}

.hours-list {
    list-style: none;
    padding: 0;
}

.hours-list li {
    display: flex;
    justify-content: space-between;
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

/* Contact Form */
.contact-form-wrapper {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 95, 141, 0.1);
}

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

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.form-checkbox input[type="checkbox"] {
    width: auto;
    margin-top: 4px;
    flex-shrink: 0;
}

.form-checkbox label {
    margin-bottom: 0;
}

.form-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-md);
}

/* ===========================
   Cookie Consent Banner
   =========================== */

.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-primary-dark);
    color: white;
    padding: var(--space-lg);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.cookie-consent[hidden] {
    display: none;
}

.cookie-consent-content {
    max-width: var(--container-width);
    margin: 0 auto;
}

.cookie-consent h2 {
    color: white;
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
}

.cookie-consent p {
    margin-bottom: var(--space-md);
    opacity: 0.95;
}

.cookie-consent-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.cookie-consent .btn-secondary {
    background-color: rgba(255, 255, 255, 0.9);
    border-color: white;
    color: var(--color-primary-dark);
}

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

/* ===========================
   Footer
   =========================== */

.site-footer {
    background: var(--color-primary-dark);
    color: white;
    padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.footer-brand .brand-name {
    color: white;
}

.footer-brand p {
    opacity: 0.85;
    margin-top: var(--space-sm);
}

.footer-nav h3,
.footer-legal h3 {
    color: white;
    font-size: var(--font-size-base);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.footer-nav ul,
.footer-legal ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-nav li,
.footer-legal li {
    margin-bottom: var(--space-sm);
}

.footer-nav a,
.footer-legal a {
    color: white;
    opacity: 0.85;
    transition: opacity var(--transition-fast);
}

.footer-nav a:hover,
.footer-legal a:hover,
.footer-nav a:focus,
.footer-legal a:focus {
    opacity: 1;
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--space-lg);
    text-align: center;
    opacity: 0.85;
    font-size: var(--font-size-sm);
}

/* ===========================
   Utilities
   =========================== */

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.publications-list {
    list-style: none;
    padding: 0;
}

.publications-list li {
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    background: var(--color-bg-light);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--border-radius-sm);
}

/* ===========================
   Print Styles
   =========================== */

@media print {
    .nav-toggle,
    .language-switcher,
    .cookie-consent,
    .hero-actions,
    .btn {
        display: none;
    }
    
    .site-header {
        position: static;
        box-shadow: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    h1 { font-size: 24pt; }
    h2 { font-size: 20pt; }
    h3 { font-size: 16pt; }
    
    .section {
        page-break-inside: avoid;
    }
}

/* ===========================
   Performance Optimizations
   =========================== */

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #1a4d7a;
        --color-text: #000000;
        --color-border: #000000;
    }
    
    .btn {
        border-width: 3px;
    }
}
/* i18n Loading State */
html.i18n-loading body {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease-in;
}

html:not(.i18n-loading) body {
    opacity: 1;
    visibility: visible;
}