/* ============================================
   喆萱信息技术 - 现代高端设计
   BIM Design | Interior Design | 3D Modeling
   ============================================ */

/* === CSS Variables === */
:root {
    /* Colors - Dark luxury palette */
    --color-primary: #c9a96e;
    --color-primary-dark: #b8944d;
    --color-primary-light: #e8d5a8;
    --color-dark: #0a0a0a;
    --color-dark-2: #1a1a1a;
    --color-dark-3: #2a2a2a;
    --color-dark-4: #3a3a3a;
    --color-text: #e8e8e8;
    --color-text-muted: #999;
    --color-text-light: #666;
    --color-white: #fff;
    --color-bg: #0a0a0a;
    --color-bg-alt: #111;
    --color-border: rgba(201, 169, 110, 0.15);

    /* Typography */
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --container-max: 1200px;
    --section-padding: 100px 0;
    --gap: 24px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    /* Border radius */
    --radius: 8px;
    --radius-lg: 16px;
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    gap: 8px;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(201, 169, 110, 0.3);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-dark);
}

.btn-outline-light {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255,255,255,0.4);
}

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

.btn-lg {
    padding: 18px 40px;
    font-size: 1.05rem;
}

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 2px;
}

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

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--color-text-muted);
    border-radius: var(--radius);
    transition: var(--transition);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-toggle {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--color-text-muted);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

.lang-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: var(--transition);
    border-radius: 1px;
}

.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 Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0a0a0a 100%);
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(201, 169, 110, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(201, 169, 110, 0.05) 0%, transparent 50%);
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-carousel {
    position: absolute;
    inset: 0;
}

.hero-carousel .carousel-slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-carousel .carousel-slide.active {
    opacity: 1;
}

.hero-carousel .carousel-slide::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10,10,10,0.7) 0%, rgba(10,10,10,0.3) 100%);
}

.carousel-dots {
    position: absolute;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: 10px;
}

.carousel-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(255,255,255,0.5);
}

.carousel-dots .dot.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: scale(1.2);
}

.carousel-dots .dot:hover {
    background: rgba(255,255,255,0.6);
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 0 24px;
    max-width: 800px;
}

.hero-subtitle {
    font-size: 0.95rem;
    color: var(--color-primary);
    letter-spacing: 6px;
    text-transform: uppercase;
    margin-bottom: 24px;
    font-weight: 300;
    opacity: 0;
    animation: fadeInUp 0.8s 0.2s forwards;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeInUp 0.8s 0.4s forwards;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    animation: fadeInUp 0.8s 0.6s forwards;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s 0.8s forwards;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    letter-spacing: 2px;
    opacity: 0;
    animation: fadeInUp 0.8s 1s forwards;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s infinite;
}

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

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* === Stats Bar === */
.stats-bar {
    background: var(--color-dark-2);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 50px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-number {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-plus, .stat-percent {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.stat-label {
    margin-top: 8px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

/* === Section Header === */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    font-size: 0.85rem;
    color: var(--color-primary);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 16px;
    font-weight: 300;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* === Services Section === */
.services {
    padding: var(--section-padding);
    background: var(--color-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.service-card {
    background: var(--color-dark-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-8px);
    border-color: rgba(201, 169, 110, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    color: var(--color-primary);
}

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

.service-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 12px;
}

.service-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

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

.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto auto;
    gap: 20px;
}

.case-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4/3;
}

.case-card-large {
    grid-column: span 2;
    grid-row: span 2;
    aspect-ratio: auto;
}

.case-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.case-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 60%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 28px;
    opacity: 0;
    transition: var(--transition);
}

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

.case-card:hover img {
    transform: scale(1.08);
}

.case-overlay h3 {
    font-size: 1.3rem;
    color: var(--color-white);
    font-weight: 600;
}

.case-overlay p {
    font-size: 0.85rem;
    color: var(--color-primary-light);
    margin-top: 4px;
}

.cases-more {
    text-align: center;
    margin-top: 48px;
}

/* === Process Section === */
.process {
    padding: var(--section-padding);
    background: var(--color-bg);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark), var(--color-primary));
    opacity: 0.3;
}

.process-step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--color-dark-2);
    border: 2px solid var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.process-step:hover .step-number {
    background: var(--color-primary);
    color: var(--color-dark);
    transform: scale(1.1);
    box-shadow: 0 0 40px rgba(201, 169, 110, 0.3);
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* === All Inclusive Section === */
.all-inclusive {
    padding: var(--section-padding);
    background: var(--color-dark-2);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.inclusive-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.inclusive-item {
    background: var(--color-dark-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 20px;
    text-align: center;
    transition: var(--transition);
}

.inclusive-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.inclusive-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.inclusive-item h4 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-white);
}

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

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-text .section-tag {
    text-align: left;
}

.about-text h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 24px;
}

.about-text p {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-text .btn {
    margin-top: 16px;
}

.about-img-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    aspect-ratio: 4/3;
}

.about-img-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    z-index: 1;
}

.about-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.about-img-wrapper:hover img {
    transform: scale(1.05);
}

/* === CTA Section === */
.cta {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(135deg, var(--color-dark-2) 0%, var(--color-dark) 100%);
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(201, 169, 110, 0.1) 0%, transparent 60%);
}

.cta h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    color: var(--color-white);
    margin-bottom: 16px;
    position: relative;
}

.cta p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    position: relative;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
}

/* === Footer === */
.footer {
    background: var(--color-dark);
    border-top: 1px solid var(--color-border);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1.5fr 2fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.footer-col ul li {
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-col ul li a:hover {
    color: var(--color-primary);
}

.footer-qr img {
    width: 120px;
    height: 120px;
    border-radius: var(--radius);
    margin-bottom: 8px;
}

.footer-qr p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.footer-bottom a:hover {
    color: var(--color-primary);
}

/* === Floating Contact === */
.floating-contact {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.float-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 4px 20px rgba(201, 169, 110, 0.3);
    transition: var(--transition);
}

.float-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(201, 169, 110, 0.5);
}

/* === 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 Design === */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .case-card-large {
        grid-column: span 2;
        grid-row: span 1;
    }
    .process-timeline {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-timeline::before {
        display: none;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--color-dark-2);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 32px 32px;
        gap: 4px;
        transition: var(--transition);
        border-left: 1px solid var(--color-border);
    }

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

    .nav-link {
        width: 100%;
        padding: 14px 16px;
        font-size: 1rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-actions .btn {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

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

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

    .case-card-large {
        grid-column: span 1;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

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

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

@media (max-width: 480px) {
    .inclusive-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .inclusive-item {
        padding: 20px 12px;
    }

    .stat-number {
        font-size: 2.2rem;
    }
}