/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    --color-bg: #0a0a0b;
    --color-bg-alt: #111113;
    --color-bg-card: #18181b;
    --color-bg-card-hover: #1f1f23;
    --color-border: #27272a;
    --color-border-light: #3f3f46;
    --color-text: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-primary: #06b6d4;
    --color-primary-hover: #22d3ee;
    --color-primary-glow: rgb(6 182 212 / 15%);
    --color-accent: #67e8f9;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --font-family: 'Inter', -apple-system, blinkmacsystemfont, 'Segoe UI', sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 4px 24px rgb(0 0 0 / 30%);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

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

/* ===========================
   Container
   =========================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
    gap: 8px;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 0 20px var(--color-primary-glow);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 0 30px rgb(6 182 212 / 25%);
    transform: translateY(-1px);
}

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

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

.btn-nav {
    padding: 8px 20px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

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

.btn-full {
    width: 100%;
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgb(10 10 11 / 80%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo-icon {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-text);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
    border-radius: 2px;
}

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

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

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

/* ===========================
   Hero
   =========================== */
.hero {
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, var(--color-primary-glow) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgb(103 232 249 / 5%) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    position: relative;
}

.hero-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-glow);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 24px;
    border: 1px solid rgb(6 182 212 / 20%);
}

.hero h1 {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 24px;
}

.highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 540px;
}

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

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Code Window */
.code-window {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow), 0 0 60px var(--color-primary-glow);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 18px;
    background: rgb(0 0 0 / 30%);
    border-bottom: 1px solid var(--color-border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #22c55e; }

.code-title {
    margin-left: 8px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.code-body {
    padding: 24px;
    font-size: 0.875rem;
    line-height: 1.8;
    overflow-x: auto;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

.code-body code {
    font-family: inherit;
}

.code-body .kw { color: #c084fc; }
.code-body .type { color: #67e8f9; }
.code-body .fn { color: #60a5fa; }
.code-body .param { color: #fb923c; }

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

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   Services
   =========================== */
.services {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

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

.service-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: var(--transition);
}

.service-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-light);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgb(0 0 0 / 30%);
}

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--color-primary-glow);
    border: 1px solid rgb(6 182 212 / 20%);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-card p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* ===========================
   Technologies
   =========================== */
.technologies {
    padding: 100px 0;
}

.tech-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.tech-category {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
}

.tech-category h3 {
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.8rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    display: inline-block;
    padding: 8px 16px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition);
}

.tech-tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-hover);
    background: var(--color-primary-glow);
}

/* ===========================
   Process
   =========================== */
.process {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

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

.step {
    text-align: center;
    padding: 36px 24px;
    position: relative;
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary);
    opacity: 0.3;
    margin-bottom: 16px;
    line-height: 1;
}

.step h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.step p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===========================
   About
   =========================== */
.about {
    padding: 100px 0;
}

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

.about-content .section-tag {
    display: inline-block;
    margin-bottom: 12px;
}

.about-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 8px;
}

.about-role {
    font-size: 1.05rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 24px;
}

.about-content p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.about-highlights {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.about-highlight {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text-secondary);
    font-size: 0.925rem;
}

.about-highlight svg {
    color: var(--color-success);
    flex-shrink: 0;
}

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

.about-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    box-shadow: var(--shadow), 0 0 60px var(--color-primary-glow);
}

.about-avatar {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    margin: 0 auto 24px;
}

.about-card-content h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.about-card-content p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ===========================
   Contact
   =========================== */
.contact {
    padding: 100px 0;
    background: var(--color-bg-alt);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.95rem;
    color: var(--color-text);
    font-family: var(--font-family);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2371717a' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-group select option {
    background: var(--color-bg-card);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding-top: 8px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--color-primary-glow);
    border: 1px solid rgb(6 182 212 / 20%);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 2px;
}

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

.contact-cta {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    margin-top: 12px;
}

.contact-cta p:first-child {
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-cta-text {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

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

.footer-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-left p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

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

/* ===========================
   Animations
   =========================== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   Responsive
   =========================== */
@media (width <= 1024px) {
    .hero h1 {
        font-size: 2.5rem;
    }

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

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

@media (width <= 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-visual {
        order: -1;
    }

    .section-header h2 {
        font-size: 2rem;
    }

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

    .tech-categories {
        grid-template-columns: 1fr;
    }

    .process-steps {
        grid-template-columns: 1fr;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-visual {
        order: -1;
    }

    .about-content h2 {
        font-size: 2rem;
    }

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

    .footer-container {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

@media (width <= 480px) {
    .hero h1 {
        font-size: 1.85rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* ===========================
   Hero badge (AI)
   =========================== */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 7px 16px 7px 12px;
    margin-bottom: 20px;
    background: var(--color-primary-glow);
    border: 1px solid rgb(6 182 212 / 25%);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    transition: var(--transition);
}

.hero-badge:hover {
    border-color: var(--color-primary);
    background: rgb(6 182 212 / 18%);
    transform: translateY(-1px);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 0 0 rgb(6 182 212 / 70%);
    animation: ai-pulse 2.4s infinite;
}

.hero-badge-arrow {
    transition: var(--transition);
}

.hero-badge:hover .hero-badge-arrow {
    transform: translateX(3px);
}

@keyframes ai-pulse {
    70% { box-shadow: 0 0 0 10px rgb(6 182 212 / 0%); }
    100% { box-shadow: 0 0 0 0 rgb(6 182 212 / 0%); }
}

.nav-ai {
    color: var(--color-accent);
}

/* ===========================
   AI Section
   =========================== */
.ai {
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.ai::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
    pointer-events: none;
}

.ai .container {
    position: relative;
}

.badge-new {
    display: inline-block;
    margin-left: 8px;
    padding: 3px 10px;
    background: var(--color-primary);
    color: #0a0a0b;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    vertical-align: middle;
}

.ai-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    margin-bottom: 72px;
}

.ai-showcase-content h3 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
}

.ai-showcase-lead {
    color: var(--color-text-secondary);
    margin-bottom: 28px;
}

.ai-benefits {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.ai-benefits li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.ai-benefits svg {
    flex-shrink: 0;
    margin-top: 3px;
    color: var(--color-primary);
}

.ai-benefits strong {
    color: var(--color-text);
    font-weight: 600;
}

/* Animated chat window */
.ai-chat {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 24px 60px rgb(0 0 0 / 45%);
    overflow: hidden;
}

.ai-chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.ai-chat-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--color-primary-glow);
    border: 1px solid rgb(6 182 212 / 30%);
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 700;
}

.ai-chat-meta h4 {
    font-size: 0.95rem;
    font-weight: 700;
}

.ai-chat-meta p {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.ai-status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-success);
}

.ai-chat-body {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 24px 20px;
    min-height: 340px;
}

.ai-msg {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    line-height: 1.55;
    animation: ai-msg-in 0.4s ease both;
}

.ai-msg.user {
    align-self: flex-end;
    background: var(--color-primary);
    color: #06212a;
    font-weight: 500;
    border-bottom-right-radius: 4px;
}

.ai-msg.bot {
    align-self: flex-start;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    border-bottom-left-radius: 4px;
}

.ai-msg .ai-msg-time {
    display: block;
    margin-top: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
}

.ai-typing {
    display: flex;
    align-self: flex-start;
    gap: 5px;
    padding: 14px 16px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    border-bottom-left-radius: 4px;
    animation: ai-msg-in 0.3s ease both;
}

.ai-typing span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-text-muted);
    animation: ai-bounce 1.2s infinite;
}

.ai-typing span:nth-child(2) {
    animation-delay: 0.15s;
}

.ai-typing span:nth-child(3) {
    animation-delay: 0.3s;
}

@keyframes ai-msg-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

@keyframes ai-bounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }

    30% {
        transform: translateY(-5px);
        opacity: 1;
    }
}

/* AI service cards */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 72px;
}

.ai-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: var(--transition);
}

.ai-card:hover {
    background: var(--color-bg-card-hover);
    border-color: rgb(6 182 212 / 40%);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgb(0 0 0 / 30%);
}

.ai-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.ai-card p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* ROI calculator */
.ai-calc {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 44px;
}

.ai-calc-head {
    text-align: center;
    margin-bottom: 36px;
}

.ai-calc-head h3 {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.ai-calc-head p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.ai-calc-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 44px;
    align-items: center;
}

.calc-field {
    margin-bottom: 28px;
}

.calc-field:last-child {
    margin-bottom: 0;
}

.calc-field label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.calc-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

.calc-field input[type="range"] {
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 100px;
    background: var(--color-border);
    outline: none;
    cursor: pointer;
}

.calc-field input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid var(--color-bg-card);
    box-shadow: 0 0 12px var(--color-primary-glow);
    cursor: pointer;
}

.calc-field input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid var(--color-bg-card);
    cursor: pointer;
}

.ai-calc-result {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 28px;
    text-align: center;
}

.calc-result-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.calc-result-value {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.2;
    margin-bottom: 20px;
}

.calc-result-value.accent {
    color: var(--color-primary);
    text-shadow: 0 0 30px var(--color-primary-glow);
}

.calc-note {
    font-size: 0.775rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    margin-bottom: 20px;
}

/* Featured tech category */
.tech-category.featured {
    grid-column: 1 / -1;
    border-color: rgb(6 182 212 / 30%);
    background: linear-gradient(160deg, rgb(6 182 212 / 7%) 0%, var(--color-bg-card) 60%);
}

.tech-category.featured h3 {
    color: var(--color-primary);
}

/* ===========================
   AI Section — Responsive
   =========================== */
@media (width <= 1024px) {
    .ai-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (width <= 768px) {
    .ai-showcase {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .ai-calc {
        padding: 28px 20px;
    }

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

    .ai-calc-head h3 {
        font-size: 1.3rem;
    }

    .calc-result-value {
        font-size: 1.6rem;
    }
}