/*
 * Welcome to Kazakhstan - Main Stylesheet
 * Production-ready, mobile-first responsive design
 */

/* ===============================================
   CSS VARIABLES & CUSTOM PROPERTIES
   =============================================== */
:root {
    /* Colors */
    --color-primary: #0066CC;
    --color-primary-dark: #004C99;
    --color-primary-light: #3385D6;
    --color-secondary: #00A8CC;
    --color-accent: #FFB800;
    --color-success: #28A745;
    --color-warning: #FFC107;
    --color-danger: #DC3545;

    /* Neutrals */
    --color-text: #1A1A1A;
    --color-text-light: #4A4A4A;
    --color-text-lighter: #757575;
    --color-bg: #FFFFFF;
    --color-bg-gray: #F5F7FA;
    --color-bg-dark: #2C3E50;
    --color-border: #E0E0E0;
    --color-border-light: #F0F0F0;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Georgia', 'Times New Roman', serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Layout */
    --container-max: 1200px;
    --container-padding: 1.5rem;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 400ms ease-in-out;
}

/* ===============================================
   RESET & BASE STYLES
   =============================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* ===============================================
   TYPOGRAPHY
   =============================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); }
h3 { font-size: clamp(1.5rem, 3vw, 1.875rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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);
}

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

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

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

strong {
    font-weight: 600;
}

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

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

.section {
    padding: var(--spacing-xxl) 0;
}

.section-gray {
    background-color: var(--color-bg-gray);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: 1fr;
}

.grid-3 {
    grid-template-columns: 1fr;
}

.grid-4 {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===============================================
   ACCESSIBILITY
   =============================================== */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm);
    z-index: 100;
    text-decoration: none;
}

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

/* ===============================================
   HEADER & NAVIGATION
   =============================================== */
.header {
    background-color: var(--color-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--container-padding);
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    fill: var(--color-primary);
}

.logo-text {
    display: none;
}

@media (min-width: 768px) {
    .logo-text {
        display: inline;
    }
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
    transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-base);
}

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

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

.nav-toggle[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg) translate(5px, 6px);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg) translate(5px, -6px);
}

.nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--color-bg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xxl) var(--spacing-lg);
    list-style: none;
    transition: right var(--transition-base);
    overflow-y: auto;
}

.nav-menu.active {
    right: 0;
}

.nav-menu li {
    margin-bottom: 0;
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) 0;
    font-size: 1.125rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-light);
    transition: color var(--transition-fast);
}

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

.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

@media (min-width: 1024px) {
    .nav-toggle {
        display: none;
    }

    .nav-menu {
        position: static;
        display: flex;
        gap: var(--spacing-lg);
        width: auto;
        max-width: none;
        height: auto;
        padding: 0;
        box-shadow: none;
        overflow-y: visible;
    }

    .nav-link {
        border-bottom: none;
        padding: var(--spacing-xs) 0;
        font-size: 1rem;
        position: relative;
    }

    .nav-link::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 0;
        width: 0;
        height: 2px;
        background-color: var(--color-primary);
        transition: width var(--transition-base);
    }

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

/* ===============================================
   HERO SECTION
   =============================================== */
.hero {
    position: relative;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    color: white;
}

@media (min-width: 768px) {
    .hero {
        min-height: 600px;
    }
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-background::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.5));
    z-index: 2;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    padding: var(--spacing-lg);
}

.hero-title {
    color: white;
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

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

@media (min-width: 640px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* ===============================================
   BUTTONS
   =============================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

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

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

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

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* ===============================================
   BREADCRUMB
   =============================================== */
.breadcrumb {
    padding: var(--spacing-md) var(--container-padding);
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--spacing-xs);
}

.breadcrumb-list li {
    margin: 0;
}

.breadcrumb-list li:not(:last-child)::after {
    content: '›';
    margin-left: var(--spacing-xs);
    color: var(--color-text-lighter);
}

.breadcrumb-list a {
    color: var(--color-text-light);
    text-decoration: none;
}

.breadcrumb-list a:hover {
    color: var(--color-primary);
}

.breadcrumb-list [aria-current="page"] {
    color: var(--color-text-lighter);
}

/* ===============================================
   FOOTER
   =============================================== */
.footer {
    background-color: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    margin-top: auto;
}

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

@media (min-width: 640px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-links {
    list-style: none;
    padding: 0;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-copyright,
.footer-disclaimer {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-sm);
}

/* ===============================================
   UTILITIES
   =============================================== */
.lead {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--color-text-light);
}

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

.section-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.intro-text {
    font-size: 1.125rem;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    color: var(--color-text-light);
}

/* ===============================================
   RESPONSIVE IMAGES
   =============================================== */
picture {
    display: block;
}

img[loading="lazy"] {
    opacity: 0;
    transition: opacity var(--transition-slow);
}

img.loaded,
img[loading="lazy"]:not([src=""]) {
    opacity: 1;
}