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

:root {
    --color-primary: #1a3a5c;
    --color-primary-dark: #0f2640;
    --color-accent: #e8a838;
    --color-accent-hover: #d4952e;
    --color-text: #333;
    --color-text-light: #666;
    --color-bg: #fff;
    --color-bg-gray: #f5f6f8;
    --color-bg-dark: #1a2332;
    --color-border: #e0e0e0;
    --font-main: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --container-width: 1140px;
    --header-height: 72px;
    --radius: 8px;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

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

/* ===== Container ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: box-shadow var(--transition);
}

.header--scrolled {
    box-shadow: 0 2px 16px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: var(--color-primary);
}

.nav {
    display: flex;
    gap: 32px;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 4px 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav__link:hover::after {
    width: 100%;
}

/* Burger */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.burger span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
    border-radius: 2px;
}

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

.burger--active span:nth-child(2) {
    opacity: 0;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.btn--primary {
    background: var(--color-accent);
    color: #fff;
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(232,168,56,0.35);
}

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

/* ===== Section ===== */
.section {
    padding: 96px 0;
}

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

.section--dark {
    background: var(--color-bg-dark);
    color: #fff;
}

.section__title {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 56px;
    color: var(--color-primary);
}

.section__title--light {
    color: #fff;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: #fff;
    padding-top: var(--header-height);
}

.hero__inner {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.hero__title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero__subtitle {
    font-size: 1.25rem;
    opacity: 0.85;
    margin-bottom: 40px;
    line-height: 1.6;
}

/* ===== About ===== */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.about__text p {
    margin-bottom: 16px;
    color: var(--color-text-light);
    font-size: 1.05rem;
}

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

.about__stats {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.stat {
    text-align: center;
    padding: 24px;
    background: var(--color-bg-gray);
    border-radius: var(--radius);
}

.stat__number {
    display: block;
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat__label {
    font-size: 0.95rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Services ===== */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    background: #fff;
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}

.service-card__icon {
    width: 56px;
    height: 56px;
    color: var(--color-accent);
    margin-bottom: 20px;
}

.service-card__icon svg {
    width: 100%;
    height: 100%;
}

.service-card__title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-primary);
}

.service-card__text {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ===== Advantages ===== */
.advantages__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.advantage {
    text-align: center;
    padding: 32px 20px;
}

.advantage__number {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 16px;
    line-height: 1;
}

.advantage__title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-primary);
}

.advantage__text {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* ===== Contacts ===== */
.contacts__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
}

.contact-item {
    margin-bottom: 28px;
}

.contact-item__label {
    display: block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.6;
    margin-bottom: 8px;
}

.contact-item__value {
    font-size: 1.05rem;
    line-height: 1.6;
}

.contact-item__link {
    color: var(--color-accent);
}

.contact-item__link:hover {
    color: var(--color-accent-hover);
}

/* Contact Form */
.contact-form {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 36px;
}

.contact-form__title {
    font-size: 1.3rem;
    margin-bottom: 24px;
}

.contact-form__input {
    width: 100%;
    padding: 14px 16px;
    margin-bottom: 16px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius);
    color: #fff;
    font-size: 1rem;
    font-family: var(--font-main);
    transition: border-color var(--transition);
}

.contact-form__input::placeholder {
    color: rgba(255,255,255,0.4);
}

.contact-form__input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.contact-form__textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-primary-dark);
    color: rgba(255,255,255,0.5);
    padding: 24px 0;
}

.footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer__copy {
    font-size: 0.9rem;
}

.footer__top {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.5);
}

.footer__top:hover {
    color: var(--color-accent);
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in--visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero__title {
        font-size: 2.2rem;
    }

    .hero__subtitle {
        font-size: 1.05rem;
    }

    .section {
        padding: 64px 0;
    }

    .section__title {
        font-size: 1.8rem;
        margin-bottom: 40px;
    }

    .about__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about__stats {
        flex-direction: row;
        justify-content: center;
    }

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

    .advantages__grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .contacts__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    /* Mobile nav */
    .burger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: center;
        gap: 0;
        padding: 16px 0;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition);
    }

    .nav--open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav__link {
        padding: 12px 24px;
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: 1.8rem;
    }

    .about__stats {
        flex-direction: column;
    }

    .stat__number {
        font-size: 2.2rem;
    }

    .contact-form {
        padding: 24px;
    }

    .footer__inner {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}