/* --------------------------------------------------------------------------
   Mehul Sharma — Portfolio
   Dark, minimal, mobile-first
   -------------------------------------------------------------------------- */

:root {
  --bg: #0f1419;
  --bg-elevated: #161c24;
  --bg-alt: #121820;
  --surface: #1a222d;
  --border: #2a3441;
  --border-subtle: #222b36;
  --text: #e8eef5;
  --text-muted: #9aa8b8;
  --text-faint: #6b7a8c;
  --accent: #5b9fd4;
  --accent-soft: rgba(91, 159, 212, 0.14);
  --accent-hover: #7ab3e0;
  --focus: #7ab3e0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 8px 24px rgba(0, 0, 0, 0.25);
  --font: "DM Sans", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --space-2xl: 5.5rem;
  --header-h: 4rem;
  --max: 68rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 0.75rem);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.2s var(--ease);
}

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

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--text);
}

p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

p:last-child {
  margin-bottom: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-sm);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header / Nav ----------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.nav__logo {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--text);
  text-decoration: none;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
}

.nav__logo:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  cursor: pointer;
}

.nav__toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.25s var(--ease), opacity 0.2s ease;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__list {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  flex-direction: column;
  gap: 0.25rem;
  padding: var(--space-md);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.nav__list.is-open {
  display: flex;
}

.nav__list a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
}

.nav__list a:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.nav__cta {
  color: var(--accent) !important;
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__list {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 0.35rem;
    padding: 0;
    background: transparent;
    border: none;
  }

  .nav__list a {
    padding: 0.45rem 0.85rem;
  }

  .nav__cta {
    margin-left: 0.35rem;
    border: 1px solid var(--border);
    background: var(--surface);
  }

  .nav__cta:hover {
    border-color: var(--accent);
  }
}

/* Hero ------------------------------------------------------------------- */

.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(91, 159, 212, 0.12), transparent 60%),
    var(--bg);
}

.hero__inner {
  max-width: 40rem;
}

.hero__eyebrow {
  margin: 0 0 var(--space-sm);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero__title {
  margin: 0 0 var(--space-md);
  font-size: clamp(2.4rem, 6vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero__tagline {
  margin: 0 0 var(--space-lg);
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 34rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.25rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn--primary {
  background: var(--accent);
  color: #0a1016;
}

.btn--primary:hover {
  background: var(--accent-hover);
  color: #0a1016;
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  background: var(--accent-soft);
}

/* Sections --------------------------------------------------------------- */

.section {
  padding: var(--space-xl) 0;
}

.section--alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border-subtle);
}

.section__title {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1.5rem, 3vw, 1.85rem);
}

.section__lead {
  margin: 0 0 var(--space-lg);
  max-width: 36rem;
  color: var(--text-faint);
  font-size: 0.98rem;
}

/* About ------------------------------------------------------------------ */

.about__grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 1.4fr 0.85fr;
    gap: var(--space-xl);
    align-items: start;
  }
}

.about__copy p + p {
  margin-top: 1rem;
}

.facts {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: var(--space-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.facts li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.facts li:first-child {
  padding-top: 0.25rem;
}

.facts li:last-child {
  border-bottom: none;
  padding-bottom: 0.25rem;
}

.facts__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.facts__value {
  color: var(--text);
  font-weight: 500;
}

/* Projects --------------------------------------------------------------- */

.projects {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .projects {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .projects {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color 0.2s var(--ease), transform 0.25s var(--ease);
}

.card:hover {
  border-color: #3d4d60;
  transform: translateY(-2px);
}

.card__title {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

.card__desc {
  margin: 0 0 var(--space-md);
  font-size: 0.95rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tags li {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.28rem 0.55rem;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}

.card__links {
  display: flex;
  gap: 1rem;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-subtle);
}

.card__links a {
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
}

.card__links a:hover {
  text-decoration: underline;
}

/* Skills ----------------------------------------------------------------- */

.skills {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .skills {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }
}

.skills__heading {
  margin: 0 0 var(--space-sm);
  font-size: 0.85rem;
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chips li {
  padding: 0.45rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}

/* Contact ---------------------------------------------------------------- */

.contact {
  text-align: center;
  max-width: 36rem;
}

.contact .section__title,
.contact__lead {
  text-align: center;
  margin-inline: auto;
}

.contact__email {
  display: inline-block;
  margin: 0.25rem 0 var(--space-lg);
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.15rem;
}

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

.social {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}

.social a {
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
}

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

/* Footer ----------------------------------------------------------------- */

.site-footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border-subtle);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-sm);
  align-items: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-faint);
}

.site-footer__note {
  font-family: var(--mono);
  font-size: 0.75rem !important;
}

/* Reduced motion --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .card:hover {
    transform: none;
  }
}