:root {
    --primary: #ff5500;
    --primary-dark: #e04a00;
    --primary-light: #ff7733;
    --accent: #ffc107;
    --dark: #1a1a2e;
    --dark-2: #2d2d44;
    --gray-900: #212529;
    --gray-700: #495057;
    --gray-500: #6c757d;
    --gray-300: #dee2e6;
    --gray-100: #f8f9fa;
    --white: #ffffff;
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-width: 1500px;
    --header-height: 80px;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    color: var(--gray-700);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
    margin: 0;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 12px;
    position: relative;
    padding: 0 20px;
}

.section-tag::before,
.section-tag::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30px;
    height: 2px;
    background: var(--primary);
}

.section-tag::before { left: -20px; }
.section-tag::after { right: -20px; }

.section-title {
    font-size: 40px;
    font-weight: 900;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-title.text-left {
    text-align: left;
}

.section-subtitle {
    font-size: 17px;
    color: var(--gray-500);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.8;
}

.section-action {
    text-align: center;
    margin-top: 50px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    box-shadow: 0 6px 20px rgba(255, 85, 0, 0.35);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 6px 20px rgba(255, 85, 0, 0.35);
    transform: translateY(-2px);
}

.btn-outline-light {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.6);
}

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

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 13px;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
    padding-top: env(safe-area-inset-top);
}

.site-header.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.header-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.logo img {
    height: 50px;
    width: auto;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: var(--radius);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 18px;
    right: 18px;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-header {
    padding: 10px 24px;
    font-size: 14px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-900);
    border-radius: 2px;
    transition: var(--transition);
}

.site-footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 50px;
    padding-bottom: 50px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    height: 45px;
    width: auto;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
}

.footer-about {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: rgba(255,255,255,0.7);
}

.footer-social a:hover {
    background: var(--primary);
    color: var(--white);
}

.footer-heading {
    font-size: 17px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 24px;
    position: relative;
    padding-bottom: 12px;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--primary);
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
}

.footer-links a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 14px;
}

.footer-contact i {
    color: var(--primary);
    margin-top: 4px;
    width: 16px;
    text-align: center;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255, 85, 0, 0.4);
    z-index: 999;
    border: none;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

@media (max-width: 1200px) {
    .container { padding: 0 30px; }
    .section-title { font-size: 34px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .section { padding: 60px 0; }
    .section-header { margin-bottom: 40px; }
    .section-title { font-size: 28px; }
    .section-subtitle { font-size: 15px; }

    .header-inner { padding: 0 20px; }
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 35px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        transition: var(--transition);
        z-index: 999;
    }
    .main-nav.open { transform: translateY(0); }
    .nav-link { padding: 12px 16px; width: 100%; }
    .nav-link::after { display: none; }
    .header-actions { display: none; }
    .mobile-toggle { display: flex; }
    .site-header { background: var(--white); border-bottom: none; backdrop-filter: none; -webkit-backdrop-filter: none; }

    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; }
}