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

:root {
    --primary: #c9a962;
    --primary-dark: #a88b4a;
    --primary-light: #e0c088;
    --black: #0a0a0a;
    --dark: #1a1a1a;
    --gray: #2a2a2a;
    --light-gray: #666;
    --text-gray: #999;
    --white: #f5f5f5;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
    scroll-snap-type: y mandatory;
}

html::-webkit-scrollbar {
    display: none;
}

body {
    font-family: 'Noto Serif SC', 'Songti SC', serif;
    background-color: var(--black);
    color: var(--white);
    line-height: 1.8;
    overflow-x: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

body::-webkit-scrollbar {
    display: none;
}

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

ul {
    list-style: none;
}

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

/* ========== 导航栏 ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 25px 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent);
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(10, 10, 10, 0.95);
    padding: 15px 60px;
    backdrop-filter: blur(10px);
}

.nav-logo {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 8px;
    color: var(--primary);
    opacity: 0;
    animation: fadeInLeft 0.8s ease 0.5s forwards;
    display: flex;
    align-items: center;
    height: 42px;
    width: auto;
    img{
        height: 42px;
        width: auto;
    }
}

.nav-links {
    display: flex;
    gap: 50px;
}

.nav-links a {
    font-size: 13px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--white);
    position: relative;
    padding: 8px 0;
    opacity: 0;
    animation: fadeInDown 0.6s ease forwards;
}

.nav-links a:nth-child(1) { animation-delay: 0.8s; }
.nav-links a:nth-child(2) { animation-delay: 0.9s; }
.nav-links a:nth-child(3) { animation-delay: 1.0s; }
.nav-links a:nth-child(4) { animation-delay: 1.1s; }
.nav-links a:nth-child(5) { animation-delay: 1.2s; }

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    opacity: 0;
    animation: fadeInRight 0.8s ease 1.2s forwards;
}

.nav-toggle span {
    width: 30px;
    height: 1px;
    background: var(--white);
    transition: var(--transition);
}

/* ========== Hero Section ========== */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--black);
    scroll-snap-align: start;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, #1a1a2e 0%, #0a0a0a 70%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(201, 169, 98, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(201, 169, 98, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(201, 169, 98, 0.05) 0%, transparent 70%);
    animation: pulseGlow 8s ease-in-out infinite;
}

@keyframes pulseGlow {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0;
    animation: floatParticle 15s infinite;
}

@keyframes floatParticle {
    0% {
        opacity: 0;
        transform: translateY(100vh) scale(0);
    }
    10% {
        opacity: 0.8;
    }
    90% {
        opacity: 0.8;
    }
    100% {
        opacity: 0;
        transform: translateY(-100vh) scale(1);
    }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: 0 20px;
}

.hero-subtitle {
    font-size: 14px;
    letter-spacing: 12px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 30px;
    opacity: 0;
    animation: fadeInUp 1s ease 1.5s forwards;
}

.hero-title {
    font-size: clamp(56px, 12vw, 150px);
    font-weight: 300;
    letter-spacing: 20px;
    margin-bottom: 30px;
    line-height: 1.1;
    opacity: 0;
    animation: fadeInUp 1s ease 1.8s forwards;
}

.hero-title span {
    display: inline-block;
    color: var(--primary);
    animation: textShimmer 3s ease-in-out infinite;
}

@keyframes textShimmer {
    0%, 100% { color: var(--primary); }
    50% { color: var(--primary-light); }
}

.hero-desc {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto 60px;
    opacity: 0;
    animation: fadeInUp 1s ease 2.1s forwards;
}

.hero-cta {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 1s ease 2.4s forwards;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0;
    animation: fadeIn 1s ease 3s forwards;
}

.scroll-indicator span {
    font-size: 12px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-gray);
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(1.5); }
}

/* ========== Buttons ========== */
.btn {
    padding: 18px 50px;
    font-size: 13px;
    letter-spacing: 3px;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(201, 169, 98, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1px solid var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--black);
    transform: translateY(-3px);
}

.btn-gold {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-gold:hover {
    background: var(--primary);
    color: var(--black);
    transform: translateY(-3px);
}

/* ========== Section Common ========== */
.section {
    padding: 120px 60px;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-subtitle {
    font-size: 12px;
    letter-spacing: 6px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 25px;
    display: inline-block;
    position: relative;
}

.section-subtitle::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 1px;
    background: var(--primary);
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 300;
    letter-spacing: 5px;
}

/* ========== About Section ========== */
.about {
    background: linear-gradient(180deg, var(--black) 0%, #0f0f0f 50%, var(--black) 100%);
    min-height: 100vh;
    scroll-snap-align: start;
    display: flex;
    align-items: center;
    padding-top: 80px;
    padding-bottom: 80px;
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    align-items: center;
}

.about-text h3 {
    font-size: 32px;
    font-weight: 400;
    margin-bottom: 30px;
    letter-spacing: 3px;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.about-text h3.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
}

.about-text p {
    color: var(--text-gray);
    margin-bottom: 20px;
    font-size: 16px;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.about-text p.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.value-item {
    text-align: center;
    padding: 40px 25px;
    background: var(--dark);
    border: 1px solid var(--gray);
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.value-item.visible {
    opacity: 1;
    transform: translateY(0);
    transition: var(--transition-slow);
}

.value-item:nth-child(1) { transition-delay: 0.1s; }
.value-item:nth-child(2) { transition-delay: 0.2s; }
.value-item:nth-child(3) { transition-delay: 0.3s; }

.value-icon {
    font-size: 40px;
    margin-bottom: 20px;
    display: inline-block;
    transition: var(--transition);
}

.value-item:hover .value-icon {
    transform: scale(1.2) rotate(10deg);
    color: var(--primary);
}

.value-item h4 {
    font-size: 16px;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.value-item p {
    font-size: 13px;
    color: var(--text-gray);
}

.about-visual {
    position: relative;
    box-shadow: 
        0 30px 60px -12px rgba(0, 0, 0, 0.85),
        0 0 40px rgba(201, 169, 98, 0.12),
        0 15px 30px rgba(0, 0, 0, 0.5),
        inset 0 0 25px rgba(201, 169, 98, 0.05);
    transition: var(--transition-slow);
}

.about-visual:hover {
    box-shadow: 
        0 45px 80px -12px rgba(0, 0, 0, 0.9),
        0 0 50px rgba(201, 169, 98, 0.18),
        0 25px 50px rgba(0, 0, 0, 0.6),
        inset 0 0 35px rgba(201, 169, 98, 0.08);
}

.about-visual::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: 20px;
    bottom: 20px;
    border: 1px solid var(--primary);
    opacity: 0.3;
}

.visual-content {
    aspect-ratio: 1;
    background: var(--dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: scale(0.9);
    transition: var(--transition-slow);
}

.visual-content.visible {
    opacity: 1;
    transform: scale(1);
    transition: var(--transition-slow);
}

.visual-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.visual-content:hover .visual-image {
    transform: scale(1.1);
}

.visual-overlay {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
    padding: 40px;
    border: 1px solid rgba(201, 169, 98, 0.3);
}

.visual-icon {
    font-size: 60px;
    margin-bottom: 15px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.visual-text {
    font-size: 18px;
    letter-spacing: 5px;
    color: var(--primary);
}

/* ========== Technology Section ========== */
.tech {
    background: var(--black);
    position: relative;
    overflow: hidden;
    height: 100vh;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;    
}

.tech::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(201, 169, 98, 0.03) 0%, transparent 50%);
    animation: rotateBg 30s linear infinite;
}

@keyframes rotateBg {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

.tech-card {
    background: linear-gradient(145deg, var(--dark) 0%, var(--gray) 100%);
    padding: 50px 35px;
    text-align: center;
    border: 1px solid var(--gray);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-slow);
}

.tech-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: var(--transition-slow);
}

.tech-card:nth-child(1) { transition-delay: 0s; }
.tech-card:nth-child(2) { transition-delay: 0.15s; }
.tech-card:nth-child(3) { transition-delay: 0.3s; }
.tech-card:nth-child(4) { transition-delay: 0.45s; }

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    transform: scaleX(0);
    transition: var(--transition);
}

.tech-card:hover::before {
    transform: scaleX(1);
}

.tech-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.tech-icon {
    font-size: 50px;
    margin-bottom: 25px;
    display: inline-block;
    transition: var(--transition);
}

.tech-card:hover .tech-icon {
    transform: scale(1.1) rotate(5deg);
    color: var(--primary);
}

.tech-card h4 {
    font-size: 20px;
    margin-bottom: 15px;
    letter-spacing: 2px;
}

.tech-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

.tech-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 80px auto 0;
    padding-top: 60px;
    border-top: 1px solid var(--gray);
}

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

.stat-number {
    font-size: clamp(48px, 6vw, 72px);
    font-weight: 200;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 15px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.stat-number.visible {
    opacity: 1;
    transform: translateY(0);
    transition: var(--transition);
}

.stat-number .plus-sign {
    font-size: 0.6em;
    margin-left: 4px;
    display: inline-block;
    transform: translateY(-8px);
}

.stat-number .unit {
    font-size: 0.5em;
    margin-left: 4px;
    display: inline-block;
    transform: translateY(-4px);
}

.stat-label {
    font-size: 13px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-gray);
}

/* ========== Works Section ========== */
.works {
    background: linear-gradient(180deg, var(--black) 0%, #0f0f0f 50%, var(--black) 100%);
    min-height: 100vh;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 120px;
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap:30px 30px;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
}

.work-item {
    position: relative;
    aspect-ratio: 9/16;
    overflow: hidden;
    cursor: pointer;
    border-radius: 4px;
    opacity: 0;
    transform: scale(0.9);
    transition: var(--transition-slow);
}

.work-item.visible {
    opacity: 1;
    transform: scale(1);
    transition: var(--transition-slow);
}

.work-item:nth-child(1) { transition-delay: 0s; }
.work-item:nth-child(2) { transition-delay: 0.1s; }
.work-item:nth-child(3) { transition-delay: 0.2s; }
.work-item:nth-child(4) { transition-delay: 0.3s; }
.work-item:nth-child(5) { transition-delay: 0.4s; }
.work-item:nth-child(6) { transition-delay: 0.5s; }

.work-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2a2a4a 0%, #1a1a3a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: var(--primary);
    opacity: 0.6;
    transition: var(--transition);
}

.work-item:hover .work-image {
    transform: scale(1.1);
    opacity: 0.8;
}

.work-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.3) 50%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 30px;
    transform: translateY(100%);
    transition: var(--transition);
    pointer-events: none;
}

.work-item:hover .work-overlay {
    transform: translateY(0);
}

.work-title {
    font-size: 22px;
    letter-spacing: 2px;
    margin-bottom: 8px;
    transform: translateY(20px);
    opacity: 0;
    transition: var(--transition);
}

.work-item:hover .work-title {
    transform: translateY(0);
    opacity: 1;
    transition-delay: 0.1s;
}

.work-category {
    font-size: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    transform: translateY(20px);
    opacity: 0;
    transition: var(--transition);
}

.work-item:hover .work-category {
    transform: translateY(0);
    opacity: 1;
    transition-delay: 0.2s;
}

/* ========== Contact Section ========== */
.contact {
    background: var(--black);
    position: relative;
    padding: 80px 60px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    scroll-snap-align: start;
}

.contact-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 80px;
    align-items: center;
    width: 100%;
}

.contact-info h3 {
    font-size: 32px;
    letter-spacing: 3px;
    margin-bottom: 20px;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.contact-info h3.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
}

.contact-info p {
    color: var(--text-gray);
    font-size: 16px;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.contact-intro {
    margin-bottom: 40px !important;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.contact-intro.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
    transition-delay: 0.1s;
}

.cooperation-modes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.cooperation-modes.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
    transition-delay: 0.2s;
}

.mode-card {
    background: var(--dark);
    border: 1px solid var(--gray);
    padding: 28px 24px;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.cooperation-modes.visible .mode-card {
    opacity: 1;
    transform: translateY(0);
}

.cooperation-modes.visible .mode-card:nth-child(1) {
    transition-delay: 0.3s;
}

.cooperation-modes.visible .mode-card:nth-child(2) {
    transition-delay: 0.4s;
}

.cooperation-modes.visible .mode-card:nth-child(3) {
    transition-delay: 0.5s;
}

.mode-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.mode-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.mode-card h4 {
    font-size: 18px;
    letter-spacing: 2px;
    margin-bottom: 12px;
    color: var(--white);
}

.mode-card > p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 20px;
    opacity: 1;
    transform: none;
}

.mode-target {
    font-size: 13px;
    color: var(--primary);
    margin-bottom: 16px;
    opacity: 1;
    transform: none;
}

.mode-value {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

.mode-value li {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 2;
    padding-left: 16px;
    position: relative;
    opacity: 1;
    transform: none;
}

.mode-value li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.mode-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.mode-tags span {
    font-size: 11px;
    color: var(--primary);
    background: rgba(212, 175, 55, 0.1);
    padding: 5px 10px;
    border-radius: 2px;
    letter-spacing: 1px;
}

.contact-info p.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
    transition-delay: 0.1s;
}

.contact-details {
    margin-top: 76px;
    display: flex;
    flex-direction: column;
    gap: 32px;
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.contact-details.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
    transition-delay: 0.2s;
}

.contact-item {
    display: flex;
    flex-direction: row;
    /* align-items: center; */
    gap: 20px;
    margin-bottom: 20px;
}

.contact-icon {
    width: 60px;
    height: 60px;
    margin-top: 4px;
    background: var(--dark);
    border: 1px solid var(--gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: var(--primary);
    flex-shrink: 0;
    transition: var(--transition);
    border-radius: 50%;
}

.contact-item:hover .contact-icon {
    background: var(--primary);
    color: var(--black);
}

.contact-label {
    font-size: 12px;
    color: var(--text-gray);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.contact-value {
    font-size: 16px;
    color: var(--white);
}

.contact-form {
    background: var(--dark);
    padding: 40px;
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition-slow);
}

.contact-form.visible {
    opacity: 1;
    transform: translateX(0);
    transition: var(--transition-slow);
    transition-delay: 0.3s;
}

.form-group {
    margin-bottom: 30px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-gray);
    margin-bottom: 15px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 18px 20px;
    background: var(--black);
    border: 1px solid var(--gray);
    color: var(--white);
    font-family: inherit;
    font-size: 15px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(201, 169, 98, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--light-gray);
}

.form-group textarea {
    height: 150px;
    resize: none;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.form-submit {
    width: 100%;
    padding: 20px;
    background: var(--primary);
    color: var(--black);
    border: none;
    font-size: 14px;
    letter-spacing: 3px;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.form-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(201, 169, 98, 0.3);
}

/* ========== Footer ========== */
.footer {
    padding: 60px;
    background: var(--dark);
    text-align: center;
    border-top: 1px solid var(--gray);
    scroll-snap-align: start;
}

.footer-logo {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: 8px;
    color: var(--primary);
    margin-bottom: 20px;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-gray);
    max-width: 400px;
    margin: 0 auto;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.social-link {
    width: 45px;
    height: 45px;
    background: var(--black);
    border: 1px solid var(--gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-gray);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: var(--black);
    border-color: var(--primary);
}

.footer-copyright {
    margin-top: 40px;
    font-size: 13px;
    color: var(--light-gray);
}

/* ========== Cooperation Section ========== */
.cooperation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.coop-card {
    background: linear-gradient(145deg, var(--dark) 0%, var(--gray) 100%);
    padding: 50px 40px;
    text-align: center;
    border: 1px solid var(--gray);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-slow);
}

.coop-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: var(--transition-slow);
}

.coop-card:nth-child(1) { transition-delay: 0s; }
.coop-card:nth-child(2) { transition-delay: 0.15s; }
.coop-card:nth-child(3) { transition-delay: 0.3s; }

.coop-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    transform: scaleX(0);
    transition: var(--transition);
}

.coop-card:hover::before {
    transform: scaleX(1);
}

.coop-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.coop-icon {
    font-size: 50px;
    margin-bottom: 25px;
    display: inline-block;
    transition: var(--transition);
}

.coop-card:hover .coop-icon {
    transform: scale(1.1);
    color: var(--primary);
}

.coop-card h4 {
    font-size: 20px;
    margin-bottom: 15px;
    letter-spacing: 2px;
}

.coop-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

.coop-card ul {
    list-style: none;
    text-align: left;
}

.coop-card li {
    font-size: 14px;
    color: var(--text-gray);
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.coop-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* ========== Animations ========== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Responsive ========== */
@media (max-width: 1200px) {
    .nav {
        padding: 20px 40px;
    }

    .section {
        padding: 100px 40px;
    }

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

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

    .works-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 600px;
    }

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

@media (max-width: 992px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .about-values {
        grid-template-columns: 1fr;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .cooperation-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .nav {
        padding: 15px 20px;
    }

    .section {
        padding: 80px 20px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .tech-grid,
    .tech-stats,
    .works-grid {
        grid-template-columns: 1fr;
    }

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

    .cooperation-modes {
        grid-template-columns: 1fr;
    }

    .contact-details {
        grid-template-columns: 1fr;
        margin-top: 40px;
    }

    .contact-form {
        padding: 40px 25px;
    }
}

/* ========== Mobile Menu ========== */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--black);
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu a {
    font-size: 24px;
    letter-spacing: 3px;
    text-transform: uppercase;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.mobile-menu.active a {
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu a:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu a:nth-child(2) { transition-delay: 0.2s; }
.mobile-menu a:nth-child(3) { transition-delay: 0.3s; }
.mobile-menu a:nth-child(4) { transition-delay: 0.4s; }
.mobile-menu a:nth-child(5) { transition-delay: 0.5s; }

.mobile-close {
    position: absolute;
    top: 30px;
    right: 30px;
    font-size: 40px;
    color: var(--white);
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
}

.mobile-menu.active .mobile-close {
    opacity: 1;
    transition-delay: 0.3s;
}