/* ==========================================================================
   CSS Variables & Reset
   ========================================================================== */

:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #161616;
    --bg-card-hover: #1a1a1a;

    --text-primary: #ffffff;
    --text-secondary: #a1a1a1;
    --text-muted: #666666;

    --accent-start: #06b6d4;
    --accent-end: #0891b2;
    --accent-gradient: linear-gradient(135deg, var(--accent-start), var(--accent-end));

    --border-color: #222222;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --section-padding: 6rem;
    --container-max: 1200px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: var(--section-padding) 0;
}

/* ==========================================================================
   Typography
   ========================================================================== */

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 3rem;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px -10px var(--accent-start);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 4rem 0;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-start);
    margin-bottom: 1.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--accent-start);
    border-radius: 2rem;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.1s forwards;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.2s forwards;
}

.hero-note {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.25s forwards;
}

.hero .btn {
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.35s forwards;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(6, 182, 212, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(8, 145, 178, 0.08), transparent);
    pointer-events: none;
}

/* ==========================================================================
   Services Section
   ========================================================================== */

.services {
    background-color: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.service-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.service-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-start);
    transform: translateY(-4px);
}

.service-icon {
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    color: var(--bg-primary);
}

.service-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.service-desc {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ==========================================================================
   Tech Stack Section
   ========================================================================== */

.tech-stack {
    background-color: var(--bg-primary);
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.25rem 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    transition: all var(--transition-base);
}

.tech-item:hover {
    border-color: var(--accent-start);
    transform: translateY(-2px);
}

.tech-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.tech-category {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   Use Cases Section
   ========================================================================== */

.use-cases {
    background-color: var(--bg-secondary);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.use-case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.75rem;
    transition: all var(--transition-base);
}

.use-case-card:hover {
    border-color: var(--accent-start);
    transform: translateY(-4px);
}

.use-case-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 1rem;
}

.use-case-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.use-case-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==========================================================================
   Case Study Section
   ========================================================================== */

.case-study {
    background-color: var(--bg-primary);
}

.case-study-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.case-study-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    overflow: hidden;
    transition: all var(--transition-base);
}

.case-study-card:hover {
    border-color: var(--accent-start);
    transform: translateY(-4px);
}

.case-study-header {
    background: var(--accent-gradient);
    padding: 2rem;
    text-align: center;
}

.case-study-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(0, 0, 0, 0.7);
    margin-bottom: 0.5rem;
}

.case-study-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--bg-primary);
}

.case-study-number {
    font-size: 3rem;
    display: block;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.case-study-content {
    padding: 2rem;
}

.case-study-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
}

.case-study-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric {
    text-align: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.75rem;
}

.metric-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.metric-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.case-study-note {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

.case-study-cta {
    text-align: center;
    font-size: 0.9375rem;
    color: var(--accent-start);
    font-weight: 500;
}

.case-study-header--alt {
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
}

.case-study-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.case-study-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.case-study-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-start);
    font-weight: 600;
}

/* ==========================================================================
   How We Work Section
   ========================================================================== */

.how-we-work {
    background-color: var(--bg-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.step-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all var(--transition-base);
}

.step-card:hover {
    border-color: var(--accent-start);
    transform: translateY(-4px);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--accent-gradient);
    color: var(--bg-primary);
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: 1rem;
}

.step-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact {
    background-color: var(--bg-secondary);
    text-align: center;
}

.contact-email {
    display: inline-block;
    font-size: clamp(1.25rem, 4vw, 2rem);
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    padding: 1rem 2rem;
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    transition: all var(--transition-base);
}

.contact-email:hover {
    border-color: var(--accent-start);
    color: var(--accent-start);
    transform: translateY(-2px);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    :root {
        --section-padding: 4rem;
    }

    .case-study-grid {
        grid-template-columns: 1fr;
    }

    .case-study-number {
        font-size: 2rem;
    }

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

@media (max-width: 600px) {
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-label {
        font-size: 0.75rem;
    }

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

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

    .tech-item {
        padding: 1rem 1.25rem;
    }
}