/* ============================================
   FDS GmbH - 全新视觉风格 & 布局
   与原网站功能一致，样式与布局完全不同
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-bg: #f5f6f8;
    --color-bg-alt: #eaecf0;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #6b6b6b;
    --color-text-muted: #999999;
    --color-primary: #2b4c7e;
    --color-primary-hover: #1e3a5f;
    --color-primary-light: rgba(43, 76, 126, 0.08);
    --color-accent: #3A5FA0;
    --color-accent-light: rgba(58, 95, 160, 0.08);
    --color-border: #e0e2e6;
    --color-border-light: #eceef2;
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-shadow-md: rgba(0, 0, 0, 0.1);
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    --max-width: 1200px;
    --header-height: 72px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 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);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

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

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: #1e3a5f;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 2px 24px rgba(0, 0, 0, 0.3);
    background: rgba(30, 58, 95, 0.97);
    backdrop-filter: blur(12px);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

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

.logo-img {
    height: 44px;
    width: auto;
    border-radius: 7px;
}

.logo-text {
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.nav-list {
    display: flex;
    gap: 36px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75);
    position: relative;
    transition: var(--transition);
    padding: 6px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.9);
    transform: scaleX(0);
    transition: transform var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: #fff;
}

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

/* --- Language Switcher --- */
.lang-switch-wrapper {
    display: flex;
    align-items: center;
    margin-left: 12px;
    list-style: none;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 0;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    padding: 4px 0;
    transition: var(--transition);
    font-family: var(--font-sans);
    position: relative;
}

.lang-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: #fff;
    transform: scaleX(0);
    transition: transform var(--transition);
}

.lang-btn:hover {
    color: rgba(255, 255, 255, 0.85);
}

.lang-btn.active {
    color: #fff;
}

.lang-btn.active::after {
    transform: scaleX(1);
}

.lang-sep {
    color: rgba(255, 255, 255, 0.3);
    margin: 0 10px;
    font-size: 0.85rem;
    user-select: none;
}

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

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
}

.hero-shape-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary-light) 0%, transparent 70%);
    top: -20%;
    right: -10%;
}

.hero-shape-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-accent-light) 0%, transparent 70%);
    bottom: 10%;
    left: -5%;
}

.hero-shape-3 {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(58, 95, 160, 0.08) 0%, transparent 70%);
    top: 40%;
    left: 45%;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 32px;
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 28px;
}

.hero-title-line {
    display: block;
}

.hero-title-highlight {
    color: var(--color-primary);
    position: relative;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    border-radius: 0 4px 4px 0;
}

.stat-card:hover {
    transform: translateX(6px);
    box-shadow: 0 8px 30px var(--color-shadow);
    border-color: var(--color-primary-light);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 2px;
}

.stat-desc {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-muted);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-text-muted);
    border-radius: 2px;
    animation: scrollWheel 1.8s ease-in-out infinite;
}

@keyframes scrollWheel {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.3; transform: translateX(-50%) translateY(8px); }
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #e08a5e);
    color: #fff;
    box-shadow: 0 4px 16px rgba(212, 120, 76, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(212, 120, 76, 0.4);
}

.btn-outline {
    border: 2px solid var(--color-border);
    color: var(--color-text);
    background: transparent;
}

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

.btn-lg {
    padding: 18px 40px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

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

.section-header {
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
    max-width: 700px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    margin-top: 12px;
}

/* --- Services --- */
.services {
    background: var(--color-bg-alt);
}

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

.service-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px var(--color-shadow-md);
    border-color: transparent;
}

.service-icon {
    width: 56px;
    height: 56px;
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--color-accent);
    transition: var(--transition);
}

.service-icon svg {
    width: 28px;
    height: 28px;
}

.service-card:hover .service-icon {
    background: var(--color-accent);
    color: #fff;
}

.service-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-desc {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 20px;
}

.service-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.service-link span {
    transition: transform var(--transition);
}

.service-link:hover span {
    transform: translateX(4px);
}

/* --- Capabilities --- */
.capabilities {
    background: var(--color-bg);
}

.capabilities-layout {
    display: grid;
    grid-template-columns: 1fr 1px 1fr 1px 1fr;
    gap: 0;
    align-items: start;
}

.capability-item {
    padding: 0 40px;
}

.capability-number {
    font-size: 5rem;
    font-weight: 800;
    color: var(--color-border);
    line-height: 1;
    margin-bottom: 16px;
    transition: var(--transition);
}

.capability-item:hover .capability-number {
    color: var(--color-primary-light);
}

.capability-content h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.capability-content > p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.capability-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.capability-list li {
    font-size: 0.9rem;
    color: var(--color-text);
    padding-left: 24px;
    position: relative;
}

.capability-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    transform: rotate(45deg);
}

.capability-divider {
    background: linear-gradient(180deg, transparent, var(--color-border), transparent);
    height: 100%;
    min-height: 200px;
}

/* --- Partners --- */
.partners {
    background: var(--color-bg-alt);
}

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

.partner-logo-wrap {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 36px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.partner-logo-wrap:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px var(--color-shadow);
    transform: translateY(-4px);
}

.partner-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 0.02em;
    text-align: center;
}

.partner-logo-1 { color: #95bf47; }
.partner-logo-2 { color: #ff9900; }
.partner-logo-3 { color: #e53238; }
.partner-logo-4 { color: #ee4d2d; }
.partner-logo-5 { color: #0f1568; }
.partner-logo-6 { color: #ff6a00; }
.partner-logo-7 { color: #c91623; }
.partner-logo-8 { color: #0071dc; }
.partner-logo-9 { color: #e2001a; }
.partner-logo-10 { color: #1a1a1a; }
.partner-logo-11 { color: #00a6a0; }
.partner-logo-12 { color: #8e24aa; }
.partner-logo-13 { color: #0066b3; }
.partner-logo-14 { color: #6abf4b; }
.partner-logo-15 { color: #ff5a00; }
.partner-logo-16 { color: #1c9b4e; }

/* --- CTA --- */
.cta {
    background: var(--color-bg);
    padding: 120px 0;
}

.cta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.cta-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.cta-desc {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 36px;
}

.cta-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.cta-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.cta-graphic {
    position: relative;
    width: 320px;
    height: 320px;
}

.cta-circle {
    position: absolute;
    border-radius: 50%;
}

.cta-circle-1 {
    width: 280px;
    height: 280px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
    top: 20px;
    left: 20px;
    animation: floatCircle 6s ease-in-out infinite;
}

.cta-circle-2 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-primary-light));
    top: 60px;
    left: 60px;
    animation: floatCircle 6s ease-in-out 2s infinite;
}

.cta-circle-3 {
    width: 120px;
    height: 120px;
    background: var(--color-primary);
    opacity: 0.15;
    top: 100px;
    left: 100px;
    animation: floatCircle 6s ease-in-out 4s infinite;
}

@keyframes floatCircle {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-16px) scale(1.03); }
}

/* --- Footer --- */
.footer {
    background: #1e3a5f;
    color: rgba(255, 255, 255, 0.7);
    padding: 72px 0 32px;
}

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

.footer-logo {
    display: inline-block;
    margin-bottom: 16px;
}

.footer-logo-img {
    height: 40px;
    width: auto;
    border-radius: 6px;
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 320px;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-contact p {
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.footer-contact a {
    color: inherit;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
}

/* --- Animations --- */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-visible {
    opacity: 1;
    transform: translateY(0);
}

[data-aos-delay="100"] { transition-delay: 0.1s; }
[data-aos-delay="200"] { transition-delay: 0.2s; }
[data-aos-delay="300"] { transition-delay: 0.3s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .container { padding: 0 28px; }
    .hero-grid { grid-template-columns: 1fr; gap: 56px; }
    .hero-title { font-size: 2.75rem; }
    .hero-stats {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .stat-card { flex: 1; min-width: 200px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .capabilities-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .capability-divider { display: none; }
    .capability-item { padding: 0; }
    .partners-showcase { grid-template-columns: repeat(2, 1fr); }
    .cta-grid { grid-template-columns: 1fr; gap: 48px; }
    .cta-visual { order: -1; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .section-title { font-size: 2rem; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }

    .nav-list {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: #1e3a5f;
        flex-direction: column;
        padding: 24px;
        gap: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-list.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        display: block;
        padding: 14px 0;
        border-bottom: 1px solid var(--color-border-light);
    }

    .lang-switch-wrapper {
        margin-left: 0;
        padding-top: 14px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        justify-content: center;
    }

    .menu-toggle { display: flex; }

    .hero { padding: 100px 0 60px; }
    .hero-title { font-size: 2.25rem; }
    .hero-desc { font-size: 1rem; }
    .hero-stats { flex-direction: column; }

    .services-grid { grid-template-columns: 1fr; }
    .section { padding: 64px 0; }
    .section-title { font-size: 1.75rem; }

    .capability-number { font-size: 3.5rem; }

    .partners-showcase { grid-template-columns: 1fr 1fr; gap: 12px; }
    .partner-logo-wrap { padding: 24px 16px; }
    .partner-logo { font-size: 1.1rem; }

    .cta-title { font-size: 2rem; }
    .btn-lg { padding: 14px 28px; font-size: 0.95rem; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .cta-graphic { width: 240px; height: 240px; }
    .cta-circle-1 { width: 200px; height: 200px; }
    .cta-circle-2 { width: 140px; height: 140px; }
    .cta-circle-3 { width: 80px; height: 80px; }
}