/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Colors - Kaspersky-inspired blue gradient theme */
    --color-primary-50: #e8f4fd;
    --color-primary-100: #b8e0fb;
    --color-primary-200: #87ccf8;
    --color-primary-300: #57b8f5;
    --color-primary-400: #36a8f3;
    --color-primary-500: #1598f0;
    --color-primary-600: #0d84d9;
    --color-primary-700: #0a6bb3;
    --color-primary-800: #08538d;
    --color-primary-900: #053b67;
    
    --color-gradient-start: #0a2e5c;
    --color-gradient-mid: #0d4a8a;
    --color-gradient-end: #1598f0;
    
    --color-white: #ffffff;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #f1f3f5;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    
    --color-success: #28a745;
    --color-error: #dc3545;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 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: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --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: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: var(--color-primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-700);
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    overflow-x: hidden;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
    color: var(--color-white);
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(21, 152, 240, 0.4);
}

.btn--primary:hover {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
    color: var(--color-white);
    box-shadow: 0 6px 20px rgba(21, 152, 240, 0.5);
    transform: translateY(-1px);
}

.btn--outline {
    background: transparent;
    color: var(--color-primary-600);
    border-color: var(--color-primary-600);
}

.btn--outline:hover {
    background: var(--color-primary-50);
    color: var(--color-primary-700);
    border-color: var(--color-primary-700);
}

.btn--full {
    width: 100%;
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.header__logo {
    flex-shrink: 0;
}

.header__logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (min-width: 768px) {
    .header__logo-text {
        font-size: 1.5rem;
    }
}

.header__nav {
    display: none;
    gap: var(--spacing-xl);
    pointer-events: none;
}

.header__nav .header__link {
    pointer-events: auto;
}

@media (min-width: 768px) {
    .header__nav {
        display: flex;
    }
}

.header__link {
    color: var(--color-gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.header__link:hover {
    color: var(--color-primary-600);
}

.header__contacts {
    display: none;
    align-items: center;
    gap: var(--spacing-md);
}

@media (min-width: 1024px) {
    .header__contacts {
        display: flex;
    }
}

.header__phone {
    color: var(--color-gray-700);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.header__phone:hover {
    color: var(--color-primary-600);
}

.header__btn {
    display: none;
    position: relative;
    z-index: 10;
    pointer-events: auto;
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    padding-bottom: var(--spacing-3xl);
    overflow: hidden;
}

.hero__background {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-mid) 50%, var(--color-gradient-end) 100%);
    z-index: -2;
}

.hero__background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    z-index: -1;
}

.hero__container {
    display: grid;
    gap: var(--spacing-2xl);
    align-items: center;
}

@media (min-width: 992px) {
    .hero__container {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3xl);
    }
}

.hero__content {
    color: var(--color-white);
    text-align: center;
}

@media (min-width: 992px) {
    .hero__content {
        text-align: left;
    }
}

.hero__title {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .hero__title {
        font-size: 2.5rem;
    }
}

@media (min-width: 992px) {
    .hero__title {
        font-size: 3rem;
    }
}

.hero__subtitle {
    font-size: 1.1rem;
    line-height: 1.7;
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

@media (min-width: 992px) {
    .hero__subtitle {
        font-size: 1.25rem;
    }
}

.hero__buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .hero__buttons {
        flex-direction: row;
        align-items: center;
    }
}

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

.btn--white:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border-color: var(--color-white);
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__graphic {
    position: relative;
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (min-width: 768px) {
    .hero__graphic {
        width: 450px;
        height: 450px;
    }
}

.hero__circle {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.15);
    animation: pulse 3s ease-in-out infinite;
}

.hero__circle--1 {
    width: 100%;
    height: 100%;
    animation-delay: 0s;
}

.hero__circle--2 {
    width: 70%;
    height: 70%;
    animation-delay: 0.5s;
}

.hero__circle--3 {
    width: 45%;
    height: 45%;
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.15;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.3;
    }
}

.hero__logo-img {
    position: relative;
    z-index: 10;
    max-width: 280px;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
    animation: logo-pulse 4s ease-in-out infinite;
}

@media (min-width: 768px) {
    .hero__logo-img {
        max-width: 400px;
    }
}

@keyframes logo-pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.03);
    }
}

/* ========================================
   Section Styles
   ======================================== */
.section__title {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-900);
}

@media (min-width: 768px) {
    .section__title {
        font-size: 2.25rem;
    }
}

.section__subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--color-gray-600);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle, var(--color-primary-300) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: 0 0;
    opacity: 0.4;
    pointer-events: none;
}

.services__grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--spacing-lg);
}

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

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

.service-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-100);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-200);
}

.service-card__icon {
    width: 48px;
    height: 48px;
    color: var(--color-primary-600);
    margin-bottom: var(--spacing-lg);
}

.service-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.service-card__text {
    font-size: 0.95rem;
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-primary-50) 100%);
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary-200), transparent);
}

.about::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, rgba(21, 152, 240, 0.25) 0%, rgba(21, 152, 240, 0.5) 100%);
    clip-path: polygon(50% 0%, 55% 12%, 50% 25%, 58% 37%, 52% 50%, 60% 62%, 54% 75%, 62% 87%, 56% 100%, 100% 100%, 100% 0%);
    z-index: 0;
    pointer-events: none;
}

.about__container {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--spacing-2xl);
    align-items: center;
}

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

@media (max-width: 991px) {
    .about__container {
        max-width: 100%;
        overflow-x: hidden;
    }
}

.about__text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-lg);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

@media (max-width: 767px) {
    .about__text {
        font-size: 0.95rem;
    }
}

.about__text:last-child {
    margin-bottom: 0;
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    min-width: 0;
}

@media (max-width: 639px) {
    .about__stats {
        gap: var(--spacing-sm);
    }
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary-50), var(--color-primary-100));
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-primary-200);
    min-width: 0;
}

@media (max-width: 639px) {
    .stat-card {
        padding: var(--spacing-md);
    }
}

.stat-card__number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary-700);
    margin-bottom: var(--spacing-xs);
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.2;
}

@media (min-width: 768px) {
    .stat-card__number {
        font-size: 2.25rem;
    }
}

@media (max-width: 639px) {
    .stat-card__number {
        font-size: 1.25rem;
    }
}

.stat-card__label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-gray-600);
    font-weight: 500;
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.3;
}

@media (max-width: 639px) {
    .stat-card__label {
        font-size: 0.75rem;
    }
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    position: relative;
    padding: var(--spacing-3xl) 0;
    overflow: hidden;
}

.contact__background {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-mid) 50%, var(--color-gradient-end) 100%);
    z-index: -1;
}

.contact__background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 30% 70%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
}

.contact__container {
    position: relative;
    z-index: 1;
}

.contact__wrapper {
    max-width: 500px;
    margin: 0 auto;
}

.contact__content {
    text-align: center;
    color: var(--color-white);
    margin-bottom: var(--spacing-xl);
}

.contact .section__title {
    color: var(--color-white);
}

.contact__text {
    font-size: 1.1rem;
    opacity: 0.9;
    line-height: 1.7;
}

.contact__phones {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
}

.contact__phones-title {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.8;
}

.contact__phone {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
    transition: opacity var(--transition-fast);
}

.contact__phone:hover {
    opacity: 0.8;
    color: var(--color-white);
}

.contact__socials {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
    .contact__socials {
        flex-direction: row;
        flex-wrap: wrap;
    }
}

.contact__social {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.contact__social:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    transform: translateY(-2px);
}

.contact__social svg {
    flex-shrink: 0;
}

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

.footer__container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    align-items: center;
}

@media (min-width: 768px) {
    .footer__container {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer__logo-img {
    height: 32px;
    width: auto;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.footer__text {
    font-size: 0.875rem;
    color: var(--color-gray-400);
    margin-top: var(--spacing-xs);
}

@media (min-width: 768px) {
    .footer__text {
        margin-top: 0;
    }
}

.footer__contacts {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
}

.footer__phone,
.footer__email {
    color: var(--color-gray-300);
    transition: color var(--transition-fast);
}

.footer__phone:hover,
.footer__email:hover {
    color: var(--color-white);
}

.footer__divider {
    color: var(--color-gray-500);
}

.footer__socials {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

@media (min-width: 768px) {
    .footer__socials {
        margin-bottom: 0;
    }
}

.footer__link {
    font-size: 0.875rem;
    color: var(--color-gray-400);
}

.footer__link:hover {
    color: var(--color-white);
}

/* ========================================
   Responsive Utilities
   ======================================== */
@media (max-width: 639px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

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

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}