/* ============================================================
   智企云服 ZhiQi Cloud Services — Enterprise Corporate Website
   Style: High-end B2B · Dark Navy · Teal Accent
   ============================================================ */

/* --- Design Tokens --- */
:root {
    /* Colors */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #0f1629;
    --color-bg-tertiary: #131b30;
    --color-bg-card: #151d33;
    --color-bg-card-hover: #1a2440;
    --color-bg-input: #111827;

    --color-navy-900: #0a0e1a;
    --color-navy-800: #0f1629;
    --color-navy-700: #1a2340;
    --color-navy-600: #243054;

    --color-teal-500: #06b6d4;
    --color-teal-400: #22d3ee;
    --color-teal-300: #67e8f9;
    --color-cyan-500: #0ea5e9;
    --color-cyan-400: #38bdf8;

    --color-accent: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 100%);
    --color-accent-glow: rgba(6, 182, 212, 0.15);

    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;

    --color-border: rgba(148, 163, 184, 0.1);
    --color-border-hover: rgba(148, 163, 184, 0.2);
    --color-border-accent: rgba(6, 182, 212, 0.3);

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Inter', 'Noto Sans SC', sans-serif;

    /* Spacing */
    --section-py: 120px;
    --container-max: 1200px;
    --container-px: 24px;

    /* Effects */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px rgba(6, 182, 212, 0.12);

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 0.15s var(--ease-out);
    --transition-base: 0.3s var(--ease-out);
    --transition-slow: 0.5s var(--ease-out);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

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

ul { list-style: none; }

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

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

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    white-space: nowrap;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 2px 12px rgba(6, 182, 212, 0.3);
}
.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.45);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}
.btn-outline:hover {
    border-color: var(--color-teal-400);
    color: var(--color-teal-400);
    background: rgba(6, 182, 212, 0.05);
}

.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn-full { width: 100%; justify-content: center; padding: 14px 28px; }

/* --- Section Header --- */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}
.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-teal-400);
    margin-bottom: 16px;
}
.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.section-desc {
    font-size: 17px;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-base);
    border-bottom: 1px solid transparent;
}
.navbar.scrolled {
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-px);
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-icon svg {
    width: 36px;
    height: 36px;
}
.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    position: relative;
}
.nav-link:hover {
    color: var(--color-text-primary);
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: 2px;
    transition: width var(--transition-base);
}
.nav-link:hover::after { width: 100%; }

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

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}
.lang-toggle:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
}
.lang-arrow {
    transition: transform var(--transition-fast);
}
.lang-toggle.open .lang-arrow { transform: rotate(180deg); }

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 6px;
    min-width: 100px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
}
.lang-toggle.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.lang-option {
    display: block;
    width: 100%;
    padding: 8px 12px;
    font-size: 13px;
    color: var(--color-text-muted);
    text-align: left;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.lang-option:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}
.lang-option.active {
    color: var(--color-teal-400);
}

.nav-cta {
    padding: 8px 18px;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(148,163,184,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148,163,184,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
}
.hero-glow-1 {
    width: 500px;
    height: 500px;
    background: rgba(6, 182, 212, 0.15);
    top: -10%;
    right: -5%;
}
.hero-glow-2 {
    width: 400px;
    height: 400px;
    background: rgba(14, 165, 233, 0.12);
    bottom: -10%;
    left: -5%;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-teal-400);
    margin-bottom: 28px;
}
.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-teal-400);
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.1;
    color: var(--color-text-primary);
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}
.hero-title-accent {
    display: block;
    background: var(--color-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-text-muted);
    max-width: 520px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
}
.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}
.stat-label {
    font-size: 13px;
    color: var(--color-text-dim);
}
.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--color-border);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 450px;
}

.hero-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.hero-card-main {
    width: 100%;
    max-width: 420px;
    animation: heroFloat 6s ease-in-out infinite;
}
@keyframes heroFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}
.card-dots { display: flex; gap: 6px; }
.card-dots span { width: 10px; height: 10px; border-radius: 50%; }
.card-dots span:nth-child(1) { background: #ef4444; }
.card-dots span:nth-child(2) { background: #eab308; }
.card-dots span:nth-child(3) { background: #22c55e; }
.card-title { font-size: 12px; color: var(--color-text-dim); margin-left: auto; }

.card-body { padding: 24px; }
.card-metric {
    display: grid;
    grid-template-columns: 80px 1fr 40px;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}
.metric-label { font-size: 13px; color: var(--color-text-muted); }
.metric-bar {
    height: 6px;
    background: var(--color-bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}
.metric-fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: 3px;
    transition: width 1.5s var(--ease-out);
}
.metric-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-teal-400);
    text-align: right;
}

.card-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 80px;
    margin-top: 24px;
}
.chart-bar {
    flex: 1;
    background: linear-gradient(to top, rgba(6,182,212,0.2), rgba(6,182,212,0.6));
    border-radius: 3px 3px 0 0;
    animation: chartGrow 1.5s var(--ease-out) both;
}
.chart-bar:nth-child(1) { animation-delay: 0.1s; }
.chart-bar:nth-child(2) { animation-delay: 0.2s; }
.chart-bar:nth-child(3) { animation-delay: 0.3s; }
.chart-bar:nth-child(4) { animation-delay: 0.4s; }
.chart-bar:nth-child(5) { animation-delay: 0.5s; }
.chart-bar:nth-child(6) { animation-delay: 0.6s; }
.chart-bar:nth-child(7) { animation-delay: 0.7s; }
@keyframes chartGrow {
    from { height: 0 !important; }
}

/* Floating card */
.hero-card-float {
    position: absolute;
    bottom: 30px;
    left: -20px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    animation: floatCard 4s ease-in-out infinite 1s;
}
@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}
.float-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.1);
    border-radius: var(--radius-md);
}
.float-text { display: flex; flex-direction: column; }
.float-title { font-size: 14px; font-weight: 600; color: var(--color-text-primary); }
.float-sub { font-size: 12px; color: var(--color-teal-400); }

/* Scroll indicator */
.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-dim);
    font-size: 12px;
    z-index: 1;
}
.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-teal-400), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
    0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
    50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
    51% { transform-origin: bottom; }
    100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================================
   TRUST BAR
   ============================================================ */
.trust-bar {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
}
.trust-bar .container {
    text-align: center;
}
.trust-label {
    font-size: 13px;
    color: var(--color-text-dim);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
}
.trust-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}
.trust-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-dim);
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}
.trust-logo:hover { opacity: 1; }

/* ============================================================
   SERVICES
   ============================================================ */
.services {
    padding: var(--section-py) 0;
    background: var(--color-bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: all var(--transition-base);
    overflow: hidden;
}
.service-card:hover {
    border-color: var(--color-border-accent);
    background: var(--color-bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
    opacity: 0;
    transition: opacity var(--transition-base);
}
.service-card:hover::before { opacity: 1; }

.service-card-featured {
    border-color: rgba(6, 182, 212, 0.25);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.08);
}
.featured-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    background: rgba(6, 182, 212, 0.15);
    color: var(--color-teal-400);
    border-radius: 100px;
}

.service-icon-wrapper {
    position: relative;
    margin-bottom: 24px;
}
.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: var(--radius-md);
    color: var(--color-teal-400);
    position: relative;
    z-index: 1;
}
.service-icon-bg {
    position: absolute;
    top: -8px;
    left: -8px;
    width: 72px;
    height: 72px;
    background: radial-gradient(circle, rgba(6,182,212,0.12) 0%, transparent 70%);
    border-radius: 50%;
}

.service-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}
.service-subtitle {
    font-size: 12px;
    color: var(--color-teal-400);
    font-weight: 500;
    margin-bottom: 16px;
}
.service-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.service-features {
    margin-bottom: 24px;
}
.service-features li {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}
.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--color-teal-400);
    border-radius: 50%;
    opacity: 0.6;
}

.service-tech {
    font-size: 12px;
    color: var(--color-text-dim);
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   SOLUTIONS
   ============================================================ */
.solutions {
    padding: var(--section-py) 0;
    background: var(--color-bg-secondary);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.solution-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-base);
}
.solution-card:hover {
    border-color: var(--color-border-accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.solution-icon {
    font-size: 36px;
    margin-bottom: 16px;
}
.solution-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 12px;
}
.solution-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}
.solution-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.solution-tags span {
    font-size: 12px;
    padding: 4px 12px;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: 100px;
    color: var(--color-teal-400);
}

/* ============================================================
   TECH / WHY CHOOSE US
   ============================================================ */
.tech {
    padding: var(--section-py) 0;
    background: var(--color-bg-primary);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 64px;
}

.tech-card {
    text-align: center;
    padding: 36px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}
.tech-card:hover {
    border-color: var(--color-border-accent);
    box-shadow: var(--shadow-glow);
}

.tech-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: var(--radius-md);
    color: var(--color-teal-400);
}
.tech-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 12px;
}
.tech-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-muted);
}

/* Tech Stack */
.tech-stack {
    text-align: center;
    padding: 48px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}
.stack-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 28px;
}
.stack-items {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 24px;
}
.stack-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--color-text-muted);
}
.stack-dot {
    width: 6px;
    height: 6px;
    background: var(--color-teal-400);
    border-radius: 50%;
    opacity: 0.6;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
    padding: var(--section-py) 0;
    background: var(--color-bg-secondary);
}

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

.contact-info {
    padding-top: 20px;
}
.contact-info .section-tag { text-align: left; }
.contact-title {
    font-size: clamp(28px, 3.5vw, 38px);
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.contact-desc {
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 40px;
}
.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}
.contact-item-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: var(--radius-md);
    color: var(--color-teal-400);
    flex-shrink: 0;
}
.contact-label {
    display: block;
    font-size: 12px;
    color: var(--color-text-dim);
    margin-bottom: 2px;
}
.contact-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-primary);
}

.contact-social {
    display: flex;
    align-items: center;
    gap: 16px;
}
.social-label {
    font-size: 13px;
    color: var(--color-text-dim);
}
.social-links {
    display: flex;
    gap: 10px;
}
.social-link {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}
.social-link:hover {
    border-color: var(--color-teal-400);
    color: var(--color-teal-400);
    background: rgba(6, 182, 212, 0.05);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-fast);
    outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-dim);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-teal-400);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}
.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}
.form-group select option {
    background: var(--color-bg-input);
    color: var(--color-text-primary);
}
.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-note {
    font-size: 12px;
    color: var(--color-text-dim);
    text-align: center;
}

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

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
.footer-logo .logo-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-primary);
}
.footer-tagline {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}
.footer-social {
    display: flex;
    gap: 10px;
}
.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}
.footer-social a:hover {
    border-color: var(--color-teal-400);
    color: var(--color-teal-400);
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 16px;
}
.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-col a {
    font-size: 14px;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}
.footer-col a:hover {
    color: var(--color-teal-400);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}
.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-dim);
}
.footer-links {
    display: flex;
    gap: 24px;
}
.footer-links a {
    font-size: 13px;
    color: var(--color-text-dim);
    transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-text-muted); }

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    z-index: 900;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    border-color: var(--color-teal-400);
    color: var(--color-teal-400);
    box-shadow: var(--shadow-glow);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .hero-visual { min-height: 350px; }
    .hero-card-main { max-width: 380px; }

    .services-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    :root { --section-py: 80px; }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10, 14, 26, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 0;
        padding: 16px 0;
        border-bottom: 1px solid var(--color-border);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-base);
    }
    .nav-menu.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    .nav-link {
        display: block;
        padding: 14px 24px;
        font-size: 15px;
    }
    .nav-link::after { display: none; }

    .nav-cta { display: none; }
    .mobile-toggle { display: flex; }

    .hero { min-height: auto; padding: 120px 0 80px; }
    .hero-title { font-size: clamp(30px, 7vw, 42px); }
    .hero-stats { gap: 20px; }
    .stat-number { font-size: 22px; }

    .hero-visual { min-height: 300px; }
    .hero-card-main { max-width: 320px; }
    .hero-card-float { left: -10px; bottom: 20px; padding: 12px 16px; }

    .solutions-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .tech-stack { padding: 32px 20px; }

    .form-row { grid-template-columns: 1fr; }
    .contact-form-wrapper { padding: 28px 24px; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { justify-content: center; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }

    .trust-logos { gap: 24px; }
    .trust-logo { font-size: 15px; }

    .service-card { padding: 28px 24px; }
    .solution-card { padding: 24px; }
}

/* ============================================================
   ANIMATIONS (Intersection Observer)
   ============================================================ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.stagger-children .fade-in:nth-child(1) { transition-delay: 0.05s; }
.stagger-children .fade-in:nth-child(2) { transition-delay: 0.1s; }
.stagger-children .fade-in:nth-child(3) { transition-delay: 0.15s; }
.stagger-children .fade-in:nth-child(4) { transition-delay: 0.2s; }
.stagger-children .fade-in:nth-child(5) { transition-delay: 0.25s; }
.stagger-children .fade-in:nth-child(6) { transition-delay: 0.3s; }