:root {
    --bg: #090b18;
    --bg-alt: #11152b;
    --card: #161b33;
    --accent: #4f46e5;
    --accent-light: #818cf8;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --border: rgba(129, 140, 248, 0.25);
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 28px;
    --shadow: 0 18px 45px rgba(15, 24, 65, 0.35);
    --max-width: 1200px;
    --transition: all 0.25s ease;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: radial-gradient(circle at top, rgba(79, 70, 229, 0.16), transparent 55%), var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

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

img {
    max-width: 100%;
    display: block;
    border-radius: var(--radius-md);
}

p {
    color: var(--muted);
    margin-top: 0.5rem;
}

h1,
h2,
h3,
h4 {
    color: var(--text);
    margin: 0;
}

.container {
    width: min(100%, var(--max-width));
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 5vw, 2.5rem);
}

.section {
    padding: clamp(4rem, 8vw, 6rem) 0;
    position: relative;
}

.page-nav {
    padding: 1.25rem 0 0.5rem;
}

.page-nav .container {
    display: flex;
    justify-content: flex-start;
}

.page-nav .back-home {
    gap: 0.5rem;
}

.page-nav--bottom {
    padding: 0.75rem 0 2.5rem;
}

.back-home {
    gap: 0.5rem;
}

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

.section-header {
    max-width: 620px;
    margin-bottom: clamp(2rem, 6vw, 3rem);
}

.eyebrow {
    display: inline-block;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--accent-light);
    font-size: 0.75rem;
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.125rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.85rem 1.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    color: var(--text);
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), #6366f1);
    box-shadow: var(--shadow);
}

.btn.primary:hover,
.btn.primary:focus {
    transform: translateY(-2px);
}

.btn.ghost {
    border-color: var(--border);
    background: rgba(148, 163, 184, 0.08);
}

.btn.ghost:hover,
.btn.ghost:focus {
    border-color: var(--accent-light);
    color: var(--accent-light);
}

.btn.small {
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
}

.cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.75rem;
}

.hero {
    padding-top: 0;
}

@media (min-width: 768px) {
    .hero {
        padding-top: clamp(6rem, 12vw, 10rem);
    }
}

.hero h1 {
    font-size: clamp(2.25rem, 4.6vw, 3.5rem);
    line-height: 1.1;
}

.hero-grid {
    display: grid;
    gap: clamp(2rem, 5vw, 3.5rem);
    align-items: flex-start;
}

.hero-copy {
    max-width: 680px;
}

.hero-sidebar {
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.hero-sidebar::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.22), transparent 65%);
    z-index: 0;
}

.hero-sidebar h2 {
    font-size: 1.35rem;
    margin-bottom: 1.5rem;
}

.contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.contact-icon {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: #ffffff;
    border: 1px solid rgba(148, 163, 184, 0.35);
    box-shadow: 0 6px 14px rgba(15, 24, 65, 0.18);
    flex-shrink: 0;
}

.contact-icon img {
    width: 30px;
    height: 30px;
    object-fit: contain;
}

.grid {
    display: grid;
    gap: clamp(1.5rem, 4vw, 2.5rem);
}

.project-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.project-grid > * {
    flex: 1 1 270px;
    max-width: 100%;
}

@media (min-width: 768px) {
    .project-grid > * {
        max-width: calc(50% - clamp(0.75rem, 2vw, 1.25rem));
    }
}

@media (min-width: 1024px) {
    .project-grid > * {
        max-width: calc(33.333% - clamp(1rem, 2.67vw, 1.67rem));
    }
}

.card {
    background: var(--card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 45px rgba(15, 24, 65, 0.28);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.project-card {
    height: 100%;
}

.project-card img {
    width: 100%;
    height: clamp(220px, 28vw, 260px);
    object-fit: cover;
}

.project-card img.project-thumb--contain {
    object-fit: contain;
    background: #ffffff;
    padding: clamp(0.75rem, 2vw, 1rem);
}

.project-hero-logo {
    width: 100%;
    height: clamp(260px, 40vw, 420px);
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: clamp(1rem, 3vw, 1.5rem);
    box-shadow: 0 18px 36px rgba(15, 24, 65, 0.25);
    border: 1px solid rgba(148, 163, 184, 0.25);
    object-fit: contain;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 35px 55px rgba(15, 24, 65, 0.38);
}

.card-body {
    padding: clamp(1.5rem, 4vw, 2.1rem);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex: 1;
}

.card-body h3 {
    margin: 0;
    padding: 0;
}

.card-heading h3 {
    font-size: 1.35rem;
}

.card-subtitle {
    color: var(--muted);
    font-weight: 500;
}

.card-actions {
    margin-top: auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

p.card-meta {
    display: flex;
    align-items: center;
    color: var(--muted);
    margin: 0.5rem 0;
    padding: 0;
}

.card-meta i {
    margin: 0;
    padding: 0;
    flex-shrink: 0;
}

.edu-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem;
    margin: 0;
    padding: 0;
    list-style: none;
    color: var(--muted);
}

.edu-meta i {
    color: var(--accent-light);
}

.pill-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.pill-list li {
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 999px;
    padding: 0.4rem 0.85rem;
    background: rgba(99, 102, 241, 0.16);
    color: var(--accent-light);
}

.image-link {
    gap: 0.75rem;
}

.image-link img {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    object-fit: contain;
    background: #ffffff;
    padding: 4px;
    border: 1px solid rgba(148, 163, 184, 0.35);
}

.btn.small.image-link img {
    width: 22px;
    height: 22px;
    padding: 2px;
    background: #ffffff;
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 6px;
}

.certification-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.contact-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.contact-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 999;
    backdrop-filter: blur(18px);
    background: rgba(9, 11, 24, 0.76);
    border-bottom: 1px solid rgba(129, 140, 248, 0.16);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 72px;
}

.brand {
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-size: 0.95rem;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    padding: 0;
    margin: 0;
}

.nav-list a {
    color: var(--muted);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.8rem;
    position: relative;
    padding-bottom: 0.35rem;
}

.nav-list a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-light);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.25s ease;
}

.nav-list a:hover::after,
.nav-list a:focus::after,
.nav-list a.active::after {
    transform: scaleX(1);
}

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

.site-footer {
    padding: 2.5rem 0;
    background: rgba(9, 11, 24, 0.92);
    border-top: 1px solid rgba(129, 140, 248, 0.16);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: 0.9rem;
}

.back-to-top {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-light);
    font-weight: 600;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Project detail pages */
.project-hero {
    padding: 0 0 2.5rem;
}

@media (min-width: 768px) {
    .project-hero {
        padding: clamp(5rem, 10vw, 7rem) 0 3rem;
    }
}

.project-layout {
    display: grid;
    gap: clamp(2rem, 5vw, 3rem);
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.1rem;
    color: var(--muted);
}

.project-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.project-body {
    display: grid;
    gap: 2.5rem;
}

.project-body section {
    background: var(--card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: clamp(1.75rem, 4vw, 2.5rem);
}

.floating-top {
    position: fixed;
    right: clamp(1rem, 3vw, 1.75rem);
    bottom: clamp(1.5rem, 4vw, 2.5rem);
    min-width: 48px;
    height: 48px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0 1.2rem;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0;
    box-shadow: 0 15px 35px rgba(15, 24, 65, 0.45);
    opacity: 0;
    pointer-events: none;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 999;
}

.floating-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.floating-top span {
    line-height: 1;
}

.floating-top i {
    font-size: 1.05rem;
}

@media (max-width: 600px) {
    .page-nav {
        padding: 0.5rem 0 0.25rem;
    }

    .page-nav .back-home {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
}

.project-thumb--hero-contain {
    width: 100%;
    height: clamp(260px, 40vw, 420px);
    object-fit: contain;
    background: #ffffff;
    padding: clamp(1rem, 3vw, 1.5rem);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(148, 163, 184, 0.25);
}

.project-body h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-list {
    margin: 0;
    padding-left: 1.05rem;
    display: grid;
    gap: 0.75rem;
    color: var(--muted);
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.tech-pill {
    background: rgba(79, 70, 229, 0.18);
    border: 1px solid rgba(129, 140, 248, 0.28);
    padding: 0.4rem 0.95rem;
    border-radius: 999px;
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--accent-light);
}

.action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

/* Responsive */
@media (max-width: 960px) {
    .contact-section {
        flex-direction: column;
        align-items: flex-start;
    }

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

@media (max-width: 860px) {
    .nav-toggle {
        display: inline-flex;
    }

    nav {
        position: absolute;
        top: 100%;
        right: 1.75rem;
        background: rgba(15, 18, 40, 0.96);
        border: 1px solid rgba(129, 140, 248, 0.2);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow);
        padding: 1rem;
        opacity: 0;
        pointer-events: none;
        transform: translateY(-10px);
        transition: var(--transition);
        min-width: 220px;
    }

    nav.open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .nav-list {
        flex-direction: column;
        gap: 1rem;
    }

    .header-inner {
        position: relative;
    }
}

@media (max-width: 640px) {
    .cta-group,
    .contact-actions {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }

    .btn,
    .btn.small {
        justify-content: center;
        width: 100%;
    }

    .hero-sidebar {
        padding: 1.65rem;
    }

    .project-meta {
        flex-direction: column;
        align-items: flex-start;
    }
}