/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-card: #1a1a1d;
    --bg-card-hover: #222225;

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --accent: #10b981;
    --accent-hover: #059669;
    --accent-subtle: rgba(16, 185, 129, 0.1);
    --accent-glow: 0 0 20px rgba(16, 185, 129, 0.3);
    --accent-glow-lg: 0 0 40px rgba(16, 185, 129, 0.2);

    --border: #27272a;
    --border-light: #3f3f46;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Space Grotesk', 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition: 150ms ease;
}

/* ===== 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(--text-primary);
    background-color: var(--bg-primary);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--accent-glow);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-muted);
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.875rem;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

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

.nav-links a:not(.btn) {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    transition: color var(--transition);
}

.nav-links a:not(.btn):hover {
    color: var(--text-primary);
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--accent-subtle);
    color: var(--accent);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 100px;
    margin-bottom: 24px;
    border: 1px solid rgba(16, 185, 129, 0.2);
    box-shadow: var(--accent-glow);
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    font-weight: 700;
    line-height: 1.15;
    max-width: 900px;
    margin-bottom: 24px;
}

.hero-sub {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 40px;
    line-height: 1.7;
}

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

/* ===== Metrics ===== */
.metrics {
    padding: 60px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.metric {
    text-align: center;
}

.metric-value {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent);
    line-height: 1;
    text-shadow: 0 0 30px rgba(16, 185, 129, 0.3);
}

.metric-unit {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-top: 4px;
}

.metric-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ===== Services ===== */
.services {
    background: var(--bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid transparent;
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 250ms ease;
    cursor: pointer;
}

.service-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    border-left-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(16, 185, 129, 0.05);
}

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--accent-subtle);
    color: var(--accent);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 20px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-tags li {
    padding: 6px 12px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.8125rem;
    border-radius: var(--radius-sm);
    transition: color 250ms ease;
}

.service-card:hover .service-tags li {
    color: var(--text-secondary);
}

/* ===== Work / Case Studies ===== */
.work {
    background: var(--bg-secondary);
}

.case-study {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

.case-study:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.case-study.featured {
    margin-bottom: 40px;
    padding: 48px;
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
    border: 1px solid transparent;
    background-clip: padding-box;
    position: relative;
}

.case-study.featured::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, var(--accent), rgba(16, 185, 129, 0.1), var(--border-light));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.case-study-badge {
    display: inline-block;
    padding: 6px 12px;
    background: var(--accent-subtle);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.case-study h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.case-study-company {
    color: var(--text-muted);
    font-size: 0.9375rem;
    margin-bottom: 24px;
}

.case-study-before-after {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.case-study-before-after h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.before ul li,
.after ul li {
    position: relative;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 8px;
}

.before ul li::before {
    content: '×';
    position: absolute;
    left: 0;
    color: #ef4444;
    font-weight: bold;
}

.after ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.case-study-results {
    display: flex;
    gap: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

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

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent);
}

.result-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.case-studies-grid .case-study p:not(.case-study-company) {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 20px;
}

.case-study-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.case-study-tech span {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    border-radius: var(--radius-sm);
}

/* ===== About ===== */
.about {
    background: var(--bg-primary);
}

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

.about-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent);
    margin-bottom: 24px;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.0625rem;
    line-height: 1.7;
}

.about-cta {
    display: flex;
    gap: 16px;
    margin-top: 32px;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.social-link:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.about-skills h3 {
    font-size: 1.25rem;
    margin-bottom: 24px;
}

.skills-category {
    margin-bottom: 24px;
}

.skills-category h4 {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skills-tags span {
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    transition: all 250ms ease;
    cursor: default;
}

.skills-tags span:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-subtle);
    box-shadow: var(--accent-glow);
}

.cert-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--accent-subtle);
    color: var(--accent);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    margin-top: 8px;
    border: 1px solid rgba(16, 185, 129, 0.2);
    box-shadow: var(--accent-glow);
}

/* ===== Contact ===== */
.contact {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.contact > .container > .contact-content > p:first-of-type {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 40px;
}

.contact-methods {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
}

.contact-method {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: all var(--transition);
}

.contact-method:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--accent-glow);
}

.contact-method svg {
    color: var(--accent);
}

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

/* ===== Footer ===== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

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

/* ===== Animations ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* Nav active link indicator */
.nav-links a:not(.btn).active {
    color: var(--accent);
}

/* Accent line under hero heading */
.hero h1 .accent {
    position: relative;
}

.hero h1 .accent::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
}

/* Result value glow */
.result-value {
    text-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

/* ===== Accessibility ===== */
/* Focus states */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

.service-card:focus-within {
    border-color: var(--accent);
}

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

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* Cursor pointer on interactive elements */
.case-study,
.contact-method,
.social-link,
.nav-links a {
    cursor: pointer;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: 1fr;
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 80px 0;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: 24px;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border);
        gap: 16px;
    }

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

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 120px 0 80px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-sub {
        font-size: 1.0625rem;
    }

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

    .metric-value {
        font-size: 2.25rem;
    }

    .case-study.featured {
        padding: 24px;
    }

    .case-study-before-after {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .case-study-results {
        flex-direction: column;
        gap: 20px;
    }

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

    .contact-methods {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

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

    .hero-cta .btn {
        width: 100%;
    }

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

    .about-cta {
        flex-direction: column;
    }
}