/* ============================================================
   Design System: Minimalist Modern
   ============================================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
    --background: #FAFAFA;
    --foreground: #0F172A;
    --muted: #F1F5F9;
    --muted-foreground: #64748B;
    --accent: #0052FF;
    --accent-secondary: #4D7CFF;
    --accent-foreground: #FFFFFF;
    --border: #E2E8F0;
    --card: #FFFFFF;
    --ring: #0052FF;
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --font-display: "Calistoga", Georgia, serif;
    --font-body: "Inter", system-ui, -apple-system, sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", monospace;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.08);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);
    --shadow-accent: 0 4px 14px rgba(0,82,255,0.25);
    --shadow-accent-lg: 0 8px 24px rgba(0,82,255,0.35);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 16px;
    color: var(--foreground);
    background: var(--background);
    line-height: 1.625;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s var(--ease-out); }
a:hover { opacity: 0.85; }
img { max-width: 100%; height: auto; display: block; }

/* --- Container --- */
.section-container {
    max-width: 72rem;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================================
   HEADER / NAVIGATION
   ============================================================ */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: all 0.3s var(--ease-out);
}

.site-header.scrolled {
    background: rgba(15, 23, 42, 0.96);
    box-shadow: 0 4px 30px rgba(0,0,0,0.25);
}

.header-inner {
    max-width: 72rem;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 2rem;
}

.logo-link {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    text-decoration: none;
}

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

/* --- Navigation --- */
.main-nav { flex: 1; display: flex; justify-content: center; }

.nav-list {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 0.25rem;
}

.nav-item { position: relative; }

.nav-item > a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0.625rem 1.25rem;
    color: rgba(255,255,255,0.80);
    font-size: 0.9375rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all 0.2s var(--ease-out);
    white-space: nowrap;
}

.nav-item > a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.nav-item.active > a { color: #fff; background: rgba(0,82,255,0.2); }

.nav-item .arrow { font-size: 0.625rem; opacity: 0.6; transition: transform 0.2s; }
.nav-item:hover .arrow { transform: rotate(180deg); }

/* Dropdown */
.has-dropdown .dropdown {
    display: block;
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    background: var(--card);
    min-width: 220px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-xl);
    list-style: none;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s var(--ease-out);
    pointer-events: none;
}

.has-dropdown:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.dropdown li a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--foreground);
    font-size: 0.875rem;
    font-weight: 400;
    text-decoration: none;
    transition: all 0.15s;
}

.dropdown li a:hover {
    background: var(--muted);
    color: var(--accent);
    padding-left: 1.5rem;
}

/* Language switch */
.header-actions { display: flex; align-items: center; gap: 1rem; flex-shrink: 0; }

.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255,255,255,0.7);
    font-size: 0.8125rem;
}

.lang-active {
    color: var(--accent-secondary);
    font-weight: 600;
}

.lang-sep { opacity: 0.3; }

.lang-link { color: rgba(255,255,255,0.7); text-decoration: none; transition: color 0.2s; }
.lang-link:hover { color: #fff; opacity: 1; }

/* Mobile menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px; height: 2px;
    background: #fff;
    border-radius: 1px;
    transition: all 0.3s var(--ease-out);
}

/* ============================================================
   BANNER / HERO
   ============================================================ */
.banner-section {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 600px;
    max-height: 850px;
    overflow: hidden;
    background: var(--foreground);
}

.banner-slider { width: 100%; height: 100%; }

.banner-slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s var(--ease-out);
}

.banner-slide.active { opacity: 1; }

.banner-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0,82,255,0.12), transparent),
        linear-gradient(to top, rgba(15,23,42,0.7) 0%, rgba(15,23,42,0.25) 50%, rgba(15,23,42,0.45) 100%);
}

/* Banner hero content */
.banner-hero-content {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    z-index: 10;
    padding: 0 1.5rem;
}

.banner-hero-inner {
    max-width: 48rem;
}

.banner-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    border: 1px solid rgba(0,82,255,0.3);
    background: rgba(0,82,255,0.08);
    margin-bottom: 2rem;
    backdrop-filter: blur(8px);
}

.banner-hero-badge .pulse-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse-dot 2s infinite;
}

.banner-hero-badge span:last-child {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-secondary);
}

.banner-hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 400;
    line-height: 1.08;
    color: #fff;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.banner-hero-title .gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.banner-hero-desc {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.7;
    max-width: 36rem;
    margin: 0 auto 2.5rem;
}

.banner-hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Banner dots */
.banner-dots {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.625rem;
    z-index: 10;
}

.banner-dots .dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.25);
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    border: 1px solid rgba(255,255,255,0.1);
}

.banner-dots .dot.active {
    background: var(--accent);
    border-color: var(--accent);
    transform: scale(1.3);
    box-shadow: 0 0 12px rgba(0,82,255,0.5);
}

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-header { margin-bottom: 4rem; text-align: center; }

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    border: 1px solid rgba(0,82,255,0.25);
    background: rgba(0,82,255,0.04);
    margin-bottom: 1.25rem;
}

.section-badge .badge-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
}

.section-badge .badge-dot.pulse { animation: pulse-dot 2s infinite; }

.section-badge span:last-child {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 500;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.25rem);
    font-weight: 400;
    line-height: 1.15;
    color: var(--foreground);
    letter-spacing: -0.01em;
}

.section-title .gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--muted-foreground);
    max-width: 32rem;
    margin: 1rem auto 0;
    line-height: 1.65;
}

.section-label-en {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.25rem);
    color: rgba(15,23,42,0.03);
    line-height: 1;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 500;
    font-family: var(--font-body);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
    white-space: nowrap;
    line-height: 1.4;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #fff;
    box-shadow: var(--shadow-sm), 0 2px 8px rgba(0,82,255,0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent-lg);
    filter: brightness(1.1);
    opacity: 1;
    color: #fff;
}

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

.btn-outline:hover {
    background: var(--muted);
    border-color: rgba(0,82,255,0.25);
    opacity: 1;
}

.btn-ghost {
    background: transparent;
    color: var(--muted-foreground);
    border: 1px solid transparent;
}

.btn-ghost:hover {
    color: var(--foreground);
    background: var(--muted);
    opacity: 1;
}

.btn-light {
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.15);
    backdrop-filter: blur(8px);
}

.btn-light:hover {
    background: rgba(255,255,255,0.18);
    color: #fff;
    opacity: 1;
}

/* Arrow animation */
.arrow-icon {
    transition: transform 0.2s var(--ease-out);
}

.btn:hover .arrow-icon {
    transform: translateX(3px);
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-section {
    padding: 7rem 0;
    background: var(--background);
    position: relative;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    top: -200px; right: -200px;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(0,82,255,0.04), transparent);
    border-radius: 50%;
    pointer-events: none;
}

.about-layout {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 5rem;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transition: transform 0.5s var(--ease-out);
}

.about-image:hover img {
    transform: scale(1.02);
}

.about-image::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(0,82,255,0.08), transparent);
    pointer-events: none;
    z-index: -1;
}

.about-text .section-badge { margin-bottom: 1.5rem; }

.about-text .section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--foreground);
    margin-bottom: 1.5rem;
    line-height: 1.15;
}

.about-description {
    color: var(--muted-foreground);
    font-size: 1rem;
    line-height: 1.75;
    margin-bottom: 2.5rem;
}

.about-description p { margin-bottom: 1rem; }

.about-description p:last-child { margin-bottom: 0; }

/* Stats */
.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.stat-item {
    text-align: center;
    padding: 1.25rem;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s var(--ease-out);
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0,82,255,0.15);
}

.stat-icon {
    width: 48px; height: 48px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #fff;
}

.stat-icon svg { width: 24px; height: 24px; }

.stat-number {
    font-family: var(--font-display);
    font-size: 2.25rem;
    color: var(--foreground);
    line-height: 1.2;
}

.stat-plus { font-size: 1.5rem; }

.stat-label {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin-top: 0.25rem;
}

/* ============================================================
   SERVICES SECTION
   ============================================================ */
.services-section {
    padding: 7rem 0;
    background: var(--foreground);
    position: relative;
    overflow: hidden;
}

/* Dot pattern texture */
.services-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,1) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.025;
    pointer-events: none;
}

/* Radial glow */
.services-section::after {
    content: '';
    position: absolute;
    bottom: -100px; right: -100px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0,82,255,0.08), transparent);
    border-radius: 50%;
    pointer-events: none;
}

.services-section .section-header { position: relative; z-index: 1; }

.services-section .section-label-en { color: rgba(255,255,255,0.04); }

.services-section .section-title {
    font-family: var(--font-display);
    color: #fff;
}

.services-section .section-subtitle { color: rgba(255,255,255,0.55); }

.services-section .section-badge {
    border-color: rgba(0,82,255,0.35);
    background: rgba(0,82,255,0.1);
}

.services-section .section-badge span:last-child {
    color: var(--accent-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    position: relative;
    z-index: 1;
}

.service-card {
    text-align: center;
    padding: 2.5rem 1.5rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    transition: all 0.35s var(--ease-out);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,82,255,0.06), transparent);
    opacity: 0;
    transition: opacity 0.35s var(--ease-out);
}

.service-card:hover {
    transform: translateY(-6px);
    border-color: rgba(0,82,255,0.25);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

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

.service-card > * { position: relative; z-index: 1; }

.service-icon {
    width: 56px; height: 56px;
    margin: 0 auto 1.25rem;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: var(--shadow-accent);
}

.service-icon svg { width: 26px; height: 26px; }

.service-card h3 {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.service-card p {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.7;
}

/* ============================================================
   CLIENTS SECTION
   ============================================================ */
.clients-section {
    padding: 7rem 0;
    background: var(--background);
    position: relative;
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 56rem;
    margin: 0 auto;
}

.client-card {
    text-align: center;
    padding: 2.5rem 2rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.35s var(--ease-out);
    position: relative;
}

.client-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(0,82,255,0.15);
}

.client-card-header { margin-bottom: 1rem; }

.client-card-header h3 {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.client-card-header h4 {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--accent);
}

.client-card-divider {
    color: var(--border);
    font-size: 0.875rem;
    margin: 1rem 0;
    letter-spacing: 0.05em;
}

.client-card p {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    line-height: 1.8;
}

/* ============================================================
   INDUSTRIES SECTION
   ============================================================ */
.industries-section {
    padding: 7rem 0;
    background: var(--foreground);
    position: relative;
    overflow: hidden;
}

.industries-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,1) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.025;
    pointer-events: none;
}

.industries-section::after {
    content: '';
    position: absolute;
    top: -150px; left: -150px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0,82,255,0.06), transparent);
    border-radius: 50%;
    pointer-events: none;
}

.industries-header {
    text-align: center;
    margin-bottom: 3.5rem;
    position: relative;
    z-index: 1;
}

.industries-header .section-badge {
    margin-bottom: 1.5rem;
}

.industries-header h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: #fff;
    font-weight: 400;
    line-height: 1.5;
    max-width: 48rem;
    margin: 0 auto;
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    position: relative;
    z-index: 1;
}

.industry-col { display: flex; flex-direction: column; gap: 1.5rem; }

.industry-item {
    padding: 1.25rem;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius);
    transition: all 0.3s var(--ease-out);
}

.industry-item:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(0,82,255,0.2);
    transform: translateY(-2px);
}

.industry-item h4 {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.5rem;
}

.industry-item p {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.7;
}

/* ============================================================
   ADVANTAGES SECTION
   ============================================================ */
.advantages-section {
    padding: 7rem 0;
    background: linear-gradient(180deg, #0b1a35 0%, var(--foreground) 100%);
    position: relative;
    overflow: hidden;
}

.advantages-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,1) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.02;
    pointer-events: none;
}

.advantages-section .section-label-en { color: rgba(255,255,255,0.04); }

.advantages-section .section-title {
    font-family: var(--font-display);
    color: #fff;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem 4rem;
    position: relative;
    z-index: 1;
}

.advantage-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    padding: 1.5rem;
    border-radius: var(--radius);
    transition: all 0.3s var(--ease-out);
}

.advantage-item:hover {
    background: rgba(255,255,255,0.03);
}

.advantage-icon {
    flex-shrink: 0;
    width: 68px; height: 68px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    border: 2px dashed rgba(0,82,255,0.3);
    position: relative;
}

.advantage-icon-inner {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #fff;
    font-family: var(--font-display);
    font-size: 1.5rem;
}

.advantage-text h3 {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.advantage-num {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 400;
    color: var(--accent-secondary);
    line-height: 1;
}

.advantage-text p {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.8;
}

/* ============================================================
   ARTICLES PREVIEW
   ============================================================ */
.articles-preview {
    padding: 7rem 0;
    background: var(--background);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.article-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 0.35s var(--ease-out);
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(0,82,255,0.15);
}

.article-cover {
    height: 200px;
    background-size: cover;
    background-position: center;
    background-color: var(--muted);
}

.article-cover-placeholder {
    background: linear-gradient(135deg, #e8edf5, #dce3ee);
}

.article-info { padding: 1.5rem; }

.article-info h4 {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: 0.5rem;
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.article-summary {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-date {
    font-size: 0.8125rem;
    color: #b0b8c4;
}

.view-all-link {
    text-align: center;
    margin-top: 3rem;
}

/* ============================================================
   PAGE BANNER (articles list / detail)
   ============================================================ */
.page-banner {
    padding: 8rem 0 4rem;
    background: linear-gradient(180deg, var(--foreground), #162240);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(255,255,255,1) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.025;
    pointer-events: none;
}

.page-banner-content {
    position: relative;
    z-index: 1;
    max-width: 48rem;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.page-banner h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    color: #fff;
    margin-bottom: 0.75rem;
}

.page-banner p {
    font-size: 1.0625rem;
    color: rgba(255,255,255,0.55);
}

/* ============================================================
   ARTICLES LIST PAGE
   ============================================================ */
.articles-section-page {
    padding: 4rem 0;
}

.articles-page-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* ============================================================
   PAGINATION
   ============================================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 3rem 0 1rem;
}

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--foreground);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    background: var(--card);
    transition: all 0.2s var(--ease-out);
}

.page-link:hover { border-color: var(--accent); color: var(--accent); opacity: 1; }
.page-link.active { background: linear-gradient(135deg, var(--accent), var(--accent-secondary)); color: #fff; border-color: transparent; }

.page-dots { padding: 0 0.5rem; line-height: 2.5rem; color: var(--muted-foreground); }

/* ============================================================
   ARTICLE DETAIL
   ============================================================ */
.article-detail-section { padding: 4rem 0; }

.article-detail-container {
    max-width: 48rem;
    margin: 0 auto;
}

.article-detail-cover {
    margin-bottom: 2rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.article-detail-cover img { width: 100%; }

.article-detail-body {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--foreground);
}

.article-detail-body p { margin-bottom: 1.25rem; }

.article-detail-footer {
    margin-top: 4rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
    font-size: 0.9375rem;
    font-weight: 500;
}

.back-link:hover { opacity: 0.8; }

/* ============================================================
   EMPTY STATE
   ============================================================ */
.empty-state {
    text-align: center;
    padding: 5rem 1.5rem;
    color: var(--muted-foreground);
    font-size: 1rem;
}

/* ============================================================
   SERVICE DETAIL PAGE
   ============================================================ */
.service-detail-section {
    padding: 4rem 0;
}

.breadcrumb {
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: var(--muted-foreground);
}

.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
}

.breadcrumb a:hover { opacity: 0.8; }

.breadcrumb-sep {
    margin: 0 0.5rem;
    color: var(--border);
}

.service-detail-header {
    text-align: center;
    margin-bottom: 3rem;
}

.service-detail-icon {
    width: 80px; height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(0,82,255,0.08), rgba(77,124,255,0.08));
    border: 1px solid rgba(0,82,255,0.1);
    color: var(--accent);
}

.service-detail-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    color: var(--foreground);
    margin-bottom: 1rem;
}

.service-detail-summary {
    font-size: 1.125rem;
    color: var(--muted-foreground);
    max-width: 36rem;
    margin: 0 auto;
    line-height: 1.7;
}

.service-detail-body {
    max-width: 48rem;
    margin: 0 auto;
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--foreground);
}

.service-detail-body h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--foreground);
    margin: 2.5rem 0 1rem;
}

.service-detail-body h3 {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--foreground);
    margin: 2rem 0 0.75rem;
}

.service-detail-body p { margin-bottom: 1rem; }

.service-detail-body ul, .service-detail-body ol {
    margin: 0.75rem 0 1.5rem 1.5rem;
}

.service-detail-body li { margin-bottom: 0.5rem; }

.service-detail-cta {
    max-width: 48rem;
    margin: 4rem auto 0;
    text-align: center;
    padding: 2.5rem;
    background: linear-gradient(135deg, rgba(0,82,255,0.04), rgba(77,124,255,0.04));
    border: 1px solid rgba(0,82,255,0.1);
    border-radius: var(--radius-lg);
}

.service-detail-cta h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--foreground);
}

.service-detail-cta p {
    color: var(--muted-foreground);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

/* Service cards as links */
a.service-card {
    text-decoration: none;
    color: inherit;
    display: block;
}

a.service-card:hover h3 {
    color: var(--accent);
}

/* ============================================================
   WECHAT-STYLE ARTICLE
   ============================================================ */
.wechat-article {
    max-width: 677px;
    margin: 0 auto;
    padding: 2rem 1rem;
    background: #fff;
    min-height: 100vh;
}

.wechat-article-header {
    text-align: center;
    padding: 2rem 0 1.5rem;
}

.wechat-article-title {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 1.375rem;
    font-weight: 700;
    color: #1a1a1a;
    line-height: 1.5;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.wechat-article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: #999;
}

.wechat-article-meta span + span::before {
    content: '';
    display: none;
}

.wechat-article-author {
    color: #576b95;
}

.wechat-article-date {
    color: #b0b0b0;
}

.wechat-article-summary {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: #f7f8fa;
    border-radius: 8px;
    border-left: 3px solid #576b95;
}

.wechat-article-summary p {
    font-size: 0.875rem;
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.wechat-article-cover {
    margin-bottom: 1.5rem;
    border-radius: 4px;
    overflow: hidden;
}

.wechat-article-cover img {
    width: 100%;
    display: block;
}

/* Body — WeChat typography */
.wechat-article-body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    font-size: 1.0625rem;
    color: #333;
    line-height: 1.85;
    word-break: break-word;
    padding-bottom: 1rem;
}

.wechat-article-body h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1a1a1a;
    margin: 2rem 0 0.75rem;
    padding-left: 10px;
    border-left: 3px solid #576b95;
}

.wechat-article-body h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1a1a1a;
    margin: 1.5rem 0 0.5rem;
}

.wechat-article-body p {
    margin-bottom: 1rem;
    text-align: justify;
}

.wechat-article-body a {
    color: #576b95;
    text-decoration: none;
    border-bottom: 1px solid rgba(87,107,149,0.3);
}

.wechat-article-body a:hover { border-bottom-color: #576b95; }

.wechat-article-body strong {
    font-weight: 600;
    color: #1a1a1a;
}

.wechat-article-body ul, .wechat-article-body ol {
    margin: 0.75rem 0 1.25rem 1.5rem;
    padding: 0;
}

.wechat-article-body li {
    margin-bottom: 0.5rem;
    padding-left: 0.25rem;
}

.wechat-article-body blockquote {
    margin: 1.25rem 0;
    padding: 0.75rem 1rem;
    background: #f7f8fa;
    border-left: 3px solid #ddd;
    color: #666;
    font-size: 0.9375rem;
}

.wechat-article-body blockquote p { margin: 0; }

.wechat-article-body code {
    background: #f0f0f0;
    padding: 0.125rem 0.375rem;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: "JetBrains Mono", "Fira Code", monospace;
    color: #e74c3c;
}

.wechat-article-body pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.25rem 0;
    font-size: 0.875rem;
    line-height: 1.6;
}

.wechat-article-body pre code {
    background: none;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

.wechat-article-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.25rem auto;
    border-radius: 4px;
}

.wechat-article-body hr {
    border: none;
    border-top: 1px solid #eee;
    margin: 2rem 0;
}

/* Footer */
.wechat-article-footer {
    text-align: center;
    padding: 1.5rem 0;
}

.wechat-article-divider {
    width: 60px;
    height: 2px;
    background: #ddd;
    margin: 0 auto 2rem;
}

.wechat-article-brand {
    margin-bottom: 1.5rem;
}

.wechat-brand-logo {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: contain;
    margin-bottom: 0.5rem;
    background: #f0f0f0;
    padding: 4px;
}

.wechat-brand-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: #333;
    margin: 0 0 0.25rem;
}

.wechat-brand-desc {
    font-size: 0.75rem;
    color: #999;
    margin: 0;
}

.wechat-back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: #576b95;
    text-decoration: none;
}

.wechat-back-link:hover { opacity: 0.8; }

@media (max-width: 768px) {
    .wechat-article {
        padding: 1rem 1rem;
    }
    .wechat-article-title {
        font-size: 1.25rem;
    }
    .wechat-article-body {
        font-size: 1rem;
    }
}

/* ============================================================
   CONTACT MODAL
   ============================================================ */
.contact-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
}

.contact-modal.active { display: block; }

.contact-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(4px);
}

.contact-modal-content {
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    max-width: 560px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    z-index: 1;
}

.contact-modal-close {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--muted-foreground);
    line-height: 1;
}

.contact-modal-close:hover { color: var(--foreground); }

.contact-modal-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 0.375rem;
    color: var(--foreground);
}

.contact-modal-sub {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin-bottom: 1.5rem;
}

.contact-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.contact-modal-content .form-group {
    margin-bottom: 1rem;
}

.contact-modal-content .form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--foreground);
    margin-bottom: 0.375rem;
}

.contact-modal-content .form-group input,
.contact-modal-content .form-group textarea {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-family: var(--font-body);
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.contact-modal-content .form-group input:focus,
.contact-modal-content .form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0,82,255,0.08);
}

.contact-modal-content .form-actions {
    margin-top: 0.5rem;
}

.contact-form-msg {
    margin-top: 0.75rem;
    font-size: 0.875rem;
    text-align: center;
}

.contact-form-msg-success { color: #10b981; }
.contact-form-msg-error { color: #ef4444; }

@media (max-width: 768px) {
    .contact-form-row { grid-template-columns: 1fr; }
    .contact-modal-content { padding: 1.5rem; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    background: #080d18;
    color: var(--muted-foreground);
    padding: 3.5rem 0 2rem;
    font-size: 0.9375rem;
    position: relative;
}

.footer-inner { max-width: 72rem; margin: 0 auto; padding: 0 1.5rem; }

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 3rem;
    margin-bottom: 2.5rem;
}

.footer-info p { margin-bottom: 0.375rem; line-height: 2; }

.footer-about {
    max-width: 24rem;
    line-height: 1.8;
    color: rgba(255,255,255,0.5);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.8125rem;
}

.footer-bottom a {
    color: rgba(255,255,255,0.4);
    transition: color 0.2s;
}

.footer-bottom a:hover { color: rgba(255,255,255,0.7); opacity: 1; }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.4); }
}

@keyframes float-y {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(28px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.7s var(--ease-out) forwards;
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* --- Scroll-reveal base --- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.reveal-stagger > * {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 0.4s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 0.5s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(7) { transition-delay: 0.6s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(8) { transition-delay: 0.7s; opacity: 1; transform: translateY(0); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .about-layout { grid-template-columns: 1fr; gap: 3rem; }
    .about-image { max-width: 500px; margin: 0 auto; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .industries-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: 1fr; gap: 2rem; }
    .articles-grid, .articles-page-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: flex; }

    .nav-list {
        display: none;
        position: absolute;
        top: 72px;
        left: 0; right: 0;
        background: rgba(15,23,42,0.98);
        backdrop-filter: blur(16px);
        padding: 1rem;
        flex-direction: column;
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .nav-list.open { display: flex; }

    .nav-list .nav-item > a { padding: 0.875rem 1rem; width: 100%; }

    .has-dropdown .dropdown {
        position: static;
        transform: none;
        background: rgba(255,255,255,0.04);
        border: none;
        box-shadow: none;
        border-radius: 0;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        display: none;
    }

    .has-dropdown.open .dropdown { display: block; }

    .header-actions { margin-left: auto; margin-right: 1rem; }

    .banner-section { height: 80vh; min-height: 500px; max-height: 650px; }

    .banner-hero-title { font-size: 2.25rem; }

    .about-section, .services-section, .clients-section,
    .industries-section, .advantages-section, .articles-preview {
        padding: 4rem 0;
    }

    .about-stats { grid-template-columns: repeat(3, 1fr); gap: 1rem; }
    .stat-number { font-size: 1.75rem; }
    .services-grid { grid-template-columns: 1fr; }
    .clients-grid { grid-template-columns: 1fr; }
    .industries-grid { grid-template-columns: 1fr; }
    .articles-grid, .articles-page-grid { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; gap: 1.5rem; }
}