:root {
    --evc-orange: #ff6600;
    --evc-dark: #111111;
    --evc-gray: #1a1a1a;
    --text-white: #ffffff;
    --text-gray: #999999;
    --line-color: #333333;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family:
        Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans SC",
        "Helvetica Neue", Arial, sans-serif;
    background-color: var(--evc-dark);
    color: var(--text-white);
    overflow-x: hidden;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

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

/* Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: transparent;
    transition: background 0.4s;
}

header.scrolled {
    background: rgba(17, 17, 17, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    cursor: pointer;
    position: relative;
    z-index: 1101;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: #fff;
    margin: 5px auto;
    transition: 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(12px);
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity 0.35s ease,
        visibility 0.35s ease;
}

.mobile-menu.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.mobile-menu-inner {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 100px 32px 40px;
    gap: 24px;
}

.mobile-menu-inner a {
    font-size: 28px;
    font-weight: 600;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 14px;
}

.mobile-menu-inner a:hover,
.mobile-menu-inner a.active {
    color: var(--evc-orange);
}

.mobile-contact {
    margin-top: 12px;
}

.mobile-lang-switch {
    margin-top: 20px;
    color: #aaa;
    font-size: 14px;
    letter-spacing: 1px;
}

.mobile-menu-close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    color: #fff;
    font-size: 34px;
    line-height: 1;
    cursor: pointer;
    z-index: 1102;
}

.mobile-menu-close:hover {
    color: var(--evc-orange);
}

.logo {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 2px;
}

.logo-img {
    height: 36px;
    width: auto;
    display: block;
    object-fit: contain;
}

.logo span {
    color: var(--evc-orange);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-menu li {
    margin: 0 25px;
}

.nav-menu li a {
    font-size: 14px;
    font-weight: 500;
    color: #ddd;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: var(--evc-orange);
}

.nav-right {
    display: flex;
    align-items: center;
}

.lang-switch {
    margin-right: 30px;
    font-size: 14px;
    cursor: pointer;
    color: #ddd;
}

.btn-contact {
    padding: 10px 25px;
    background: var(--evc-orange);
    color: #fff;
    border-radius: 2px;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    display: inline-block;
}

.btn-contact:hover {
    background: #ff8533;
    box-shadow: 0 0 15px rgba(255, 102, 0, 0.4);
}

/* Common sections */
.section {
    padding: 100px 5%;
}

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

.section.dark {
    background: var(--evc-dark);
}

.section-title,
.kicker {
    font-size: 14px;
    color: var(--evc-orange);
    letter-spacing: 4px;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.section-main-title {
    font-size: 48px;
    margin-bottom: 60px;
    font-weight: 300;
    line-height: 1.2;
}

.section-desc {
    color: var(--text-gray);
    font-size: 16px;
    line-height: 1.9;
    margin-bottom: 40px;
    max-width: 840px;
}

.page-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 18px;
}

.page-title span {
    color: var(--evc-orange);
}

.page-desc {
    color: var(--text-gray);
    font-size: 16px;
    line-height: 1.9;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* Common buttons */
.btn-solid,
.btn-outline {
    padding: 14px 28px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--evc-orange);
    display: inline-block;
    transition: 0.25s;
    white-space: nowrap;
}

.btn-solid {
    background: var(--evc-orange);
    color: #fff;
}

.btn-solid:hover {
    background: transparent;
    color: var(--evc-orange);
}

.btn-outline {
    background: transparent;
    color: var(--evc-orange);
}

.btn-outline:hover {
    background: var(--evc-orange);
    color: #fff;
    box-shadow: 0 0 18px rgba(255, 102, 0, 0.25);
}

/* Footer */
footer {
    padding: 50px 5%;
    background: #000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid #222;
}

.footer-links a {
    margin-left: 20px;
    color: #666;
    font-size: 12px;
}

.footer-links a:hover {
    color: var(--evc-orange);
}

/* Animations */
@keyframes zoomIn {
    0% {
        transform: scale(1.02);
    }
    100% {
        transform: scale(1.12);
    }
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(36px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 992px) {
    .page-title {
        font-size: 40px;
    }
}

@media (max-width: 768px) {
    header {
        padding: 16px 5%;
    }

    .nav-menu,
    .nav-right {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .logo,
    .logo a {
        font-size: 24px;
    }

    .logo-img {
        height: 28px;
    }

    .page-title {
        font-size: 36px;
    }

    .section-main-title {
        font-size: 34px;
        margin-bottom: 38px;
    }

    footer {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

    .footer-links a {
        margin-left: 0;
        margin-right: 20px;
    }
}