/**
 * Corvicac Web - Optimized CSS
 * Performance-focused, responsive, and accessible styles
 * Version: 1.0.0
 * Last Updated: 2026-01-09
 */

/* ========================================
   CSS CUSTOM PROPERTIES
   ======================================== */

:root {
    /* Colors - Light Theme */
    --color-primary: #2E7D32;
    --color-primary-dark: #1B5E20;
    --color-primary-light: #4CAF50;
    --color-secondary: #1565C0;
    --color-secondary-dark: #0D47A1;
    --color-accent: #FF6F00;
    
    --color-text: #212121;
    --color-text-light: #757575;
    --color-text-lighter: #9E9E9E;
    
    --color-background: #FFFFFF;
    --color-surface: #F5F5F5;
    --color-surface-alt: #EEEEEE;
    --color-border: #E0E0E0;
    
    --color-success: #43A047;
    --color-error: #D32F2F;
    --color-warning: #F57C00;
    --color-info: #1976D2;
    
    /* Typography */
    --font-primary: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-heading: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    --line-height-tight: 1.25;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --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 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
    --z-loading: 500;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1rem;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-primary: #4CAF50;
    --color-primary-dark: #2E7D32;
    --color-primary-light: #81C784;
    
    --color-text: #FAFAFA;
    --color-text-light: #B0B0B0;
    --color-text-lighter: #808080;
    
    --color-background: #121212;
    --color-surface: #1E1E1E;
    --color-surface-alt: #2C2C2C;
    --color-border: #3C3C3C;
}

/* ========================================
   RESET & BASE
   ======================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* 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: 0;
}

/* Skip links */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 1000;
    transition: top var(--transition-fast);
}

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

/* Focus visible */
body:not(.keyboard-nav) *:focus:not(:focus-visible) {
    outline: none;
}

body.keyboard-nav *:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* Reduced motion */
.reduced-motion * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
}

/* ========================================
   CONTAINER
   ======================================== */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }
.container-xl { max-width: 1280px; }

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

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);
    text-decoration: underline;
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    line-height: var(--line-height-base);
    text-align: center;
    white-space: nowrap;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
}

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ========================================
   CARDS
   ======================================== */

.card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

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

.card-img-top {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.card-title {
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

/* ========================================
   NAVIGATION
   ======================================== */

.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--color-background);
    box-shadow: var(--shadow-sm);
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--color-primary);
}

.navbar-brand img {
    height: 40px;
    width: auto;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.navbar-menu a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.navbar-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.navbar-menu a:hover::after,
.navbar-menu a.active::after {
    width: 100%;
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   ACCORDION
   ======================================== */

.accordion,
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.accordion-header,
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-surface);
    cursor: pointer;
    font-weight: 600;
    -webkit-user-select: none;
    user-select: none;
    transition: background var(--transition-fast);
}

.accordion-header:hover,
.faq-question:hover {
    background: var(--color-surface-alt);
}

.accordion-header::after,
.faq-question::after {
    content: '+';
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    transition: transform var(--transition-base);
}

.accordion.active .accordion-header::after,
.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.accordion-content,
.faq-answer {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    padding: 0 var(--spacing-lg);
    transition: all var(--transition-base);
}

.accordion.active .accordion-content,
.faq-item.active .faq-answer {
    max-height: 500px;
    opacity: 1;
    padding: var(--spacing-lg);
}

/* ========================================
   FORMS
   ======================================== */

.form-group,
.input-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form-group label,
.input-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.form-control:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
}

.form-control.valid {
    border-color: var(--color-success);
}

.form-control.invalid {
    border-color: var(--color-error);
}

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

/* Floating label */
.form-group.focused label,
.input-group.focused label {
    top: 0;
    font-size: var(--font-size-xs);
    color: var(--color-primary);
}

/* ========================================
   GALLERY & LIGHTBOX
   ======================================== */

.gallery,
.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.gallery img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform var(--transition-base), filter var(--transition-base);
}

.gallery img:hover {
    transform: scale(1.02);
    filter: brightness(1.1);
}

/* Lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-image {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.lightbox-caption {
    color: white;
    text-align: center;
    padding: var(--spacing-md);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    font-size: var(--font-size-3xl);
    color: white;
    cursor: pointer;
    background: none;
    border: none;
    transition: color var(--transition-fast);
}

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

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-4xl);
    color: white;
    cursor: pointer;
    background: none;
    border: none;
    padding: var(--spacing-md);
    transition: color var(--transition-fast);
}

.lightbox-prev:hover,
.lightbox-next:hover {
    color: var(--color-primary-light);
}

.lightbox-prev { left: -60px; }
.lightbox-next { right: -60px; }

/* ========================================
   TOOLTIPS
   ======================================== */

.tooltip {
    position: fixed;
    background: var(--color-text);
    color: var(--color-background);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    z-index: var(--z-tooltip);
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

/* ========================================
   BACK TO TOP
   ======================================== */

.back-to-top,
.scroll-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-sticky);
}

.back-to-top.visible,
.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover,
.scroll-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-5px);
}

/* ========================================
   TABS
   ======================================== */

.tabs,
.tab-container {
    margin-bottom: var(--spacing-xl);
}

.tab-list {
    display: flex;
    border-bottom: 2px solid var(--color-border);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tab,
.tab-button {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    position: relative;
    transition: color var(--transition-fast);
}

.tab:hover,
.tab-button:hover {
    color: var(--color-text);
}

.tab.active,
.tab-button.active {
    color: var(--color-primary);
}

.tab.active::after,
.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
}

.tab-content,
.tab-pane {
    display: none;
}

.tab-content.active,
.tab-pane.active {
    display: block;
    animation: fadeIn var(--transition-base);
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-on-scroll,
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-slow);
}

.animate-on-scroll.animated,
.fade-in.animated {
    opacity: 1;
    transform: translateY(0);
}

.slide-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-slow);
}

.slide-up.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   LOADING STATES
   ======================================== */

.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    100% { left: 100%; }
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========================================
   LAZY LOADING
   ======================================== */

img[data-src] {
    opacity: 0;
    transition: opacity var(--transition-base);
}

img[data-src].loaded {
    opacity: 1;
}

/* ========================================
   RESPONSIVE BREAKPOINTS
   ======================================== */

/* Extra small devices (phones, < 576px) */
@media (max-width: 575.98px) {
    :root {
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --container-padding: 0.75rem;
    }
    
    .navbar-menu {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: var(--color-background);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .navbar-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .gallery {
        grid-template-columns: 1fr;
    }
    
    .lightbox-prev {
        left: 10px;
    }
    
    .lightbox-next {
        right: 10px;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .btn-lg {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
}

/* Small devices (landscape phones, 576px - 767px) */
@media (min-width: 576px) and (max-width: 767.98px) {
    :root {
        --container-padding: 1.5rem;
    }
    
    .gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Medium devices (tablets, 768px - 991px) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .navbar-menu a {
        font-size: var(--font-size-sm);
    }
    
    .gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large devices (desktops, 992px - 1199px) */
@media (min-width: 992px) and (max-width: 1199.98px) {
    .gallery {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Extra large devices (large desktops, >= 1200px) */
@media (min-width: 1200px) {
    .gallery {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Print styles */
@media print {
    .navbar,
    .back-to-top,
    .lightbox,
    .mobile-menu-toggle {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* High contrast mode */
@media (prefers-contrast: more) {
    :root {
        --color-border: #000;
    }
    
    [data-theme="dark"] {
        --color-border: #fff;
    }
    
    .btn {
        border-width: 3px;
    }
    
    .card {
        border-width: 2px;
    }
}