/* ---------- CSS RESET (modern minimal) ---------- */
*,
*::before,
*::after { box-sizing: border-box; }
body, h1, h2, h3, h4, p, figure, blockquote, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; background: none; border: none; }
a { text-decoration: none; }

/* ---------- DESIGN TOKENS (Dark only) ---------- */
:root {
  --font-sans: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;

  /* Typography scale */
  --fs-300: 0.85rem;
  --fs-400: 1rem;
  --fs-500: 1.125rem;
  --fs-600: 1.4rem;
  --fs-700: clamp(1.9rem, 4vw, 2.6rem);
  --fs-800: clamp(2.2rem, 5vw, 3.4rem);

  /* Spacing scale */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-7: 32px;
  --sp-8: 48px;
  --sp-9: 64px;

  /* Color tokens (dark) */
  --c-bg: #161616;
  --c-surface: #1f1f1f;
  --c-surface-alt: #262626;
  --c-border: #343434;
  --c-border-strong: #525252;
  --c-text: #f4f4f4;
  --c-text-secondary: #c6c6c6;
  --c-accent: #0f62fe;
  --c-accent-hover: #0043ce;
  --c-focus: #78a9ff;
  --c-danger: #fa4d56;
  --c-link: #78a9ff;
  --c-gradient: linear-gradient(135deg,#0f62fe,#0043ce);
  --c-shadow-rgb: 15 15 15;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --transition: 0.28s cubic-bezier(.2,.8,.2,1);
  --line-width: 2px;

  color-scheme: dark;
}

/* ---------- GLOBAL ---------- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-400);
  line-height: 1.55;
  background: var(--c-bg);
  color: var(--c-text);
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  width: min(1240px, 100% - 2*var(--sp-7));
  margin-inline: auto;
}

.section {
  padding: var(--sp-9) 0;
}

.section__title {
  font-size: var(--fs-600);
  font-weight: 600;
  letter-spacing: -0.5px;
  margin-bottom: var(--sp-5);
}

.section__subtitle {
  max-width: 58ch;
  font-size: var(--fs-400);
  color: var(--c-text-secondary);
  margin-bottom: var(--sp-7);
}

/* ---------- HEADER NAV ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(22,22,22,0.75);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition: background var(--transition), border-color var(--transition);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  width: min(1240px, 100% - 2*var(--sp-7));
  margin-inline: auto;
  padding: var(--sp-3) 0;
  position: relative;
}

.brand {
  font-weight: 600;
  font-size: var(--fs-500);
  color: var(--c-text);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
}

.nav {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.nav button {
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-300);
  font-weight: 500;
  color: var(--c-text-secondary);
  border-radius: var(--radius-pill);
  transition: color var(--transition), background var(--transition);
}

.nav button:hover,
.nav button:focus-visible {
  color: var(--c-text);
  background: var(--c-surface-alt);
}

/* Mobile menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--sp-2);
  width: 40px;
  height: 40px;
  justify-content: center;
  border-radius: var(--radius-sm);
}
.menu-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform .4s, opacity .4s;
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 880px) {
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    padding: var(--sp-4);
    border-radius: var(--radius-md);
    flex-direction: column;
    align-items: stretch;
    min-width: 180px;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }
  .site-header__inner {
    gap: var(--sp-3);
  }
  .menu-toggle { display: flex; margin-left: auto; }
  .nav.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
}

/* ---------- HERO ---------- */
.hero {
  padding-top: clamp(4rem, 12vh, 8rem);
  background:
    radial-gradient(at 85% 15%, #0043ce 0, transparent 60%),
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg) 100%);
  position: relative;
}

.hero__content {
  display: grid;
  gap: var(--sp-8);
  align-items: center;
}
@media (min-width: 900px) {
  .hero__content {
    grid-template-columns: 1.05fr 0.95fr;
  }
}

.hero__headline {
  font-size: var(--fs-800);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: var(--sp-5);
}

.hero__tagline {
  font-size: var(--fs-500);
  color: var(--c-text-secondary);
  max-width: 56ch;
  margin-bottom: var(--sp-6);
}

.hero__cta {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.hero__visual {
  aspect-ratio: 4/3;
  border-radius: var(--radius-md);
  background: var(--c-gradient);
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
  box-shadow:
    0 8px 24px -6px rgba(var(--c-shadow-rgb) / .55),
    0 2px 4px -1px rgba(var(--c-shadow-rgb) / .4);
}
.hero__logo {
  font-size: clamp(3rem, 8vw, 5.2rem);
  font-weight: 600;
  letter-spacing: -4px;
  color: #fff;
  text-shadow: 0 4px 18px rgba(0,0,0,.4);
  position: relative;
}

/* ---------- BUTTONS ---------- */
.btn {
  --btn-bg: var(--c-surface-alt);
  --btn-color: var(--c-text);
  --btn-border: var(--c-border);
  --btn-bg-hover: var(--c-surface-alt);
  font-size: var(--fs-300);
  font-weight: 600;
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-pill);
  border: 1px solid var(--btn-border);
  color: var(--btn-color);
  background: var(--btn-bg);
  display: inline-flex;
  gap: var(--sp-2);
  align-items: center;
  position: relative;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.btn-primary {
  --btn-bg: var(--c-accent);
  --btn-bg-hover: var(--c-accent-hover);
  --btn-border: var(--c-accent);
  --btn-color: #fff;
}
.btn-outline {
  --btn-bg: transparent;
  --btn-bg-hover: var(--c-surface-alt);
  --btn-border: var(--c-border-strong);
  --btn-color: var(--c-text);
}
.btn:hover,
.btn:focus-visible {
  background: var(--btn-bg-hover);
  border-color: var(--btn-border);
}

/* ---------- CARDS GRID ---------- */
.cards-grid {
  display: grid;
  gap: var(--sp-6);
  grid-template-columns: repeat(auto-fill,minmax(250px,1fr));
}

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: var(--sp-6) var(--sp-5) var(--sp-6);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  position: relative;
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(255,255,255,.06), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--c-border-strong);
}
.card:hover::before {
  opacity: 1;
}
.card h3, .card h4 {
  font-size: var(--fs-500);
  font-weight: 600;
  letter-spacing: -.5px;
}
.card p {
  font-size: var(--fs-300);
  color: var(--c-text-secondary);
}
.card ul {
  padding-left: 1.1em;
  list-style: disc;
  display: grid;
  gap: 4px;
  font-size: var(--fs-300);
}
.card a.inline-link {
  font-weight: 600;
  color: var(--c-link);
  font-size: var(--fs-300);
  margin-top: auto;
}
.card a.inline-link:hover { text-decoration: underline; }

/* Tags */
.tags {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}
.tag {
  font-size: 11px;
  padding: 3px 10px;
  background: var(--c-surface-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  letter-spacing: .3px;
  color: var(--c-text-secondary);
  font-weight: 500;
}

/* ---------- TIMELINE ---------- */
.timeline {
  position: relative;
  margin-left: var(--sp-7);
  border-left: var(--line-width) solid var(--c-border);
  display: grid;
  gap: var(--sp-7);
  padding-left: var(--sp-7);
}
.timeline-item {
  position: relative;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--sp-7));
  top: 4px;
  width: 14px;
  height: 14px;
  background: var(--c-accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--c-surface);
  border: 1px solid var(--c-border-strong);
}
.timeline-role {
  font-weight: 600;
  font-size: var(--fs-400);
}
.timeline-meta {
  font-size: var(--fs-300);
  color: var(--c-text-secondary);
  margin: 2px 0 var(--sp-3) 0;
  font-weight: 500;
}
.timeline-summary {
  font-size: var(--fs-300);
  color: var(--c-text-secondary);
  max-width: 60ch;
}

/* ---------- CONTACT ---------- */
.contact-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: var(--sp-7) var(--sp-6);
  border-radius: var(--radius-md);
  max-width: 640px;
  display: grid;
  gap: var(--sp-4);
}
.contact-card__notice {
  font-size: var(--fs-300);
  color: var(--c-text-secondary);
}
.contact-card__socials {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}
.contact-card__socials .btn {
  font-size: var(--fs-300);
  padding: var(--sp-2) var(--sp-4);
}

/* ---------- FOOTER ---------- */
.footer {
  padding: var(--sp-8) 0 var(--sp-9);
  text-align: center;
  font-size: var(--fs-300);
  color: var(--c-text-secondary);
  border-top: 1px solid var(--c-border);
  background: var(--c-surface);
  margin-top: var(--sp-9);
}

/* ---------- ANIMATION / REVEAL ---------- */
[ data-animate ] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .8s cubic-bezier(.2,.8,.2,1),
              transform .8s cubic-bezier(.2,.8,.2,1);
  will-change: opacity, transform;
}
[ data-animate ].visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- UTILITIES ---------- */
.hidden { display: none !important; }

/* Scrollbar styling (optional) */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--c-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--c-surface-alt);
  border-radius: 20px;
  border: 2px solid var(--c-bg);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--c-border-strong);
}