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

:root {
    --color-bg: #fafafa;
    --color-bg-alt: #f0f0f0;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #555;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-border: #e0e0e0;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
    --max-width: 960px;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 600;
}

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

a:hover {
    color: var(--color-accent-hover);
}

/* ── Nav ── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.btn-nav {
    background: var(--color-text);
    color: #fff !important;
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.85rem !important;
}

.btn-nav:hover {
    background: #333 !important;
    color: #fff !important;
}

/* ── Hero ── */
.hero {
    padding: 140px 0 80px;
}

.hero-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.hero-sub {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 560px;
    margin-bottom: 32px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    color: #fff;
}

.btn-outline {
    border: 1.5px solid var(--color-border);
    color: var(--color-text);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--color-text);
    color: var(--color-text);
}

/* ── Sections ── */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section h2 {
    font-size: 1.8rem;
    margin-bottom: 40px;
    letter-spacing: -0.02em;
}

/* ── About ── */
.about-content p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin-bottom: 16px;
}

.about-content strong {
    color: var(--color-text);
}

/* ── Services ── */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 28px;
}

.service-icon {
    color: var(--color-accent);
    margin-bottom: 16px;
}

.service-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.service-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ── Tech Stack ── */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
}

.tech-group h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.tech-list {
    list-style: none;
}

.tech-list li {
    padding: 6px 0;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--color-border);
}

.tech-list li:last-child {
    border-bottom: none;
}

/* ── Case Study ── */
.case-study {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
}

.case-study-header {
    padding: 32px 32px 0;
}

.case-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
}

.case-study-header h3 {
    font-size: 1.4rem;
    margin-top: 8px;
    letter-spacing: -0.01em;
}

.case-study-body {
    padding: 24px 32px 32px;
}

.case-summary {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: 28px;
    max-width: 640px;
}

.case-details {
    display: grid;
    gap: 24px;
    margin-bottom: 28px;
}

.case-detail h4 {
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.case-detail p,
.case-detail li {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.case-detail ul {
    padding-left: 20px;
}

.case-detail li {
    margin-bottom: 6px;
}

.case-detail li strong {
    color: var(--color-text);
}

/* ── Screenshots ── */
.case-screenshots {
    margin-bottom: 28px;
}

.case-screenshots h4 {
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.screenshot-grid {
    display: grid;
    gap: 16px;
}

.screenshot {
    margin: 0;
}

.screenshot img {
    width: 100%;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

.screenshot figcaption {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 8px;
    text-align: center;
}

.case-tech-stack h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

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

.tag {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 12px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    color: var(--color-text-muted);
}

.more-projects {
    margin-top: 32px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* ── Contact ── */
.contact-content {
    max-width: 520px;
}

.contact-content p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.contact-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ── Footer ── */
footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

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

/* ── Responsive ── */
@media (max-width: 640px) {
    .nav-links {
        gap: 16px;
    }

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

    .section {
        padding: 60px 0;
    }

    .case-study-header,
    .case-study-body {
        padding-left: 20px;
        padding-right: 20px;
    }
}