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

:root {
    --color-bg-dark: #0d0d1a;
    --color-bg-section: #12121f;
    --color-bg-card: #1a1a2e;
    --color-bg-light: #16213e;
    --color-gold: #c9a96e;
    --color-gold-light: #e0c48a;
    --color-gold-dark: #a08040;
    --color-text: #e8e8e8;
    --color-text-muted: #9a9ab0;
    --color-border: rgba(201, 169, 110, 0.2);
    --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(13, 13, 26, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    color: var(--color-gold);
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    position: relative;
    padding: 5px 0;
}

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

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

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

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

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #0d0d1a 0%, #1a1a2e 50%, #16213e 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at center, rgba(201, 169, 110, 0.03) 0%, transparent 70%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(5%, 5%) scale(1.1); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(201,169,110,0.03)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 0 20px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 20px;
    letter-spacing: 4px;
}

.hero-title-sub {
    display: block;
    font-size: clamp(0.9rem, 1.5vw, 1.1rem);
    color: var(--color-gold);
    font-weight: 400;
    letter-spacing: 6px;
    margin-bottom: 15px;
}

.hero-desc {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--color-text-muted);
    margin-bottom: 40px;
    letter-spacing: 1px;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}
/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 2px;
    letter-spacing: 1px;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--color-gold);
    color: #0d0d1a;
}

.btn-primary:hover {
    background: var(--color-gold-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(201, 169, 110, 0.3);
}

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

.btn-outline:hover {
    background: var(--color-gold);
    color: #0d0d1a;
    transform: translateY(-2px);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    letter-spacing: 2px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 1px solid var(--color-gold);
    border-bottom: 1px solid var(--color-gold);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 1; }
    50% { transform: rotate(45deg) translate(5px, 5px); opacity: 0.5; }
}

/* ===== Section Common ===== */
.section {
    padding: 100px 0;
}

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

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--color-gold);
    letter-spacing: 4px;
    margin-bottom: 10px;
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 15px;
}

.section-line {
    width: 60px;
    height: 2px;
    background: var(--color-gold);
    margin: 0 auto;
}

/* ===== About ===== */
.about {
    background: var(--color-bg-section);
}

.about-text {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.about-intro {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 15px;
    color: var(--color-text);
}

.about-text p:last-child {
    color: var(--color-text-muted);
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 40px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    border-color: var(--color-gold);
    box-shadow: 0 15px 40px rgba(201, 169, 110, 0.1);
}

.feature-icon {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    color: var(--color-gold);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-item h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--color-text);
}

.feature-item p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}
/* ===== Services ===== */
.services {
    background: var(--color-bg-dark);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-gold);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.service-img {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.service-img svg {
    width: 60px;
    height: 60px;
    color: var(--color-gold);
    opacity: 0.8;
}

.service-card h3 {
    padding: 20px 25px 10px;
    font-size: 1.1rem;
    color: var(--color-text);
}

.service-card p {
    padding: 0 25px 25px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===== Cases ===== */
.cases {
    background: var(--color-bg-section);
}

.cases-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 24px;
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 2px;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-gold);
    border-color: var(--color-gold);
    color: #0d0d1a;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.case-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition);
}

.case-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.case-item.hidden {
    display: none;
}

.case-img {
    height: 200px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: flex-end;
    padding: 15px;
    opacity: 0;
    transition: var(--transition);
}

.case-item:hover .case-overlay {
    opacity: 1;
}

.case-category {
    font-size: 0.75rem;
    color: var(--color-gold);
    border: 1px solid var(--color-gold);
    padding: 3px 10px;
    border-radius: 2px;
}

.case-info {
    padding: 20px;
}

.case-info h4 {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 8px;
}

.case-info p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}
/* ===== Stats ===== */
.stats {
    background: linear-gradient(135deg, var(--color-bg-dark), var(--color-bg-light));
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item {
    padding: 30px 20px;
}

.stat-number {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--color-gold);
    display: inline;
}

.stat-unit {
    font-size: 1rem;
    color: var(--color-gold);
    display: inline;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 10px;
    letter-spacing: 2px;
}

/* ===== Contact ===== */
.contact {
    background: var(--color-bg-dark);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 25px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.contact-item:hover {
    border-color: var(--color-gold);
}

.contact-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    color: var(--color-gold);
}

.contact-icon svg {
    width: 100%;
    height: 100%;
}

.contact-item h4 {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 5px;
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.contact-map {
    height: 100%;
    min-height: 300px;
}

.map-placeholder {
    width: 100%;
    height: 100%;
    min-height: 300px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    color: var(--color-text-muted);
}

.map-placeholder svg {
    width: 50px;
    height: 50px;
    color: var(--color-gold);
    opacity: 0.5;
}

.map-placeholder p {
    text-align: center;
    font-size: 0.9rem;
    line-height: 1.6;
}
/* ===== Footer ===== */
.footer {
    background: #080810;
    padding: 60px 0 30px;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-brand .logo-icon,
.footer-brand .logo-text {
    display: inline;
}

.footer-desc {
    margin-top: 15px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1rem;
    color: var(--color-text);
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h4::after,
.footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--color-gold);
}

.footer-links a {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 10px;
}

.footer-links a:hover {
    color: var(--color-gold);
    padding-left: 5px;
}

.footer-contact p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 25px;
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ===== Animations ===== */
.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

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

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}
/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .about-features {
        grid-template-columns: repeat(2, 1fr);
    }
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(13, 13, 26, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        transition: var(--transition);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

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

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

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

    .hero-title {
        font-size: 2rem;
    }

    .about-features {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

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

    .footer-bottom {
        flex-direction: column;
        align-items: center;
        gap: 10px;
        text-align: center;
    }

    .section {
        padding: 70px 0;
    }

    .cases-filter {
        gap: 8px;
    }

    .filter-btn {
        padding: 6px 16px;
        font-size: 0.8rem;
    }
}