/* ============================================================
   A9uzzOG — premium grey/black theme
   Display: Clash Display · Body: General Sans · Mono: JetBrains Mono
   ============================================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-tap-highlight-color: transparent; }

:root {
  /* ---- dark (default) ---- */
  --bg:            #08080a;
  --bg-soft:       #0e0e11;
  --surface:       #17171b;
  --surface-2:     #1e1e23;
  --border:        #2a2a30;
  --border-strong: #3a3a41;
  --text:          #f1f1ee;
  --text-muted:    #9c9ca3;
  --text-faint:    #63636b;
  --shine-1:       #ffffff;
  --shine-2:       #8a8a90;
  --on-shine:      #0a0a0b;
  --overlay-bg:    rgba(6, 6, 8, 0.86);

  --font-display: 'Clash Display', system-ui, sans-serif;
  --font-body:    'General Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --fs-hero: clamp(2.75rem, 5vw + 1.4rem, 6rem);
  --fs-h2:   clamp(1.9rem, 1.6vw + 1.3rem, 2.75rem);
  --fs-lede: clamp(1.05rem, 0.4vw + 0.95rem, 1.2rem);

  --pad-x: clamp(1.5rem, 6vw, 6rem);
  --pad-y: clamp(4rem, 9vw, 7.5rem);
}

[data-theme="light"] {
  --bg:            #f2f1ed;
  --bg-soft:       #ebe9e4;
  --surface:       #ffffff;
  --surface-2:     #f8f7f4;
  --border:        #dcd8d0;
  --border-strong: #c7c2b7;
  --text:          #17171a;
  --text-muted:    #57575e;
  --text-faint:    #8c8c92;
  --shine-1:       #17171a;
  --shine-2:       #48484f;
  --on-shine:      #f5f5f3;
  --overlay-bg:    rgba(242, 241, 237, 0.92);
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background .4s var(--ease-in-out), color .4s var(--ease-in-out);
}

a { color: inherit; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; line-height: 1.05; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

::selection { background: var(--text); color: var(--bg); }

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------------- grain + progress ---------------- */

.grain {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: .035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

.progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 65;
  background: transparent;
}
.progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--shine-2), var(--shine-1));
  will-change: transform;
}

/* ---------------- header ---------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--pad-x);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.brand span { color: var(--text-muted); }

.header-actions { display: flex; align-items: center; gap: .5rem; }

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text);
  transition: background .25s var(--ease-out), transform .25s var(--ease-out);
}
.icon-btn:hover { background: var(--surface-2); transform: translateY(-1px); }

#themeToggle .icon-sun,
#themeToggle .icon-moon {
  position: absolute;
  transition: transform .5s var(--ease-out), opacity .35s var(--ease-out);
}
#themeToggle { position: relative; }
#themeToggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(.5); }
#themeToggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] #themeToggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] #themeToggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(.5); }

/* hamburger — the "3 lines" */
.hamburger {
  width: 40px;
  height: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 50%;
  transition: background .25s var(--ease-out);
}
.hamburger:hover { background: var(--surface-2); }
.hamburger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .4s var(--ease-out), opacity .3s var(--ease-out), width .3s var(--ease-out);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------------- nav overlay ---------------- */

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 55;
  visibility: hidden;
  pointer-events: none;
}
.nav-overlay.is-open { visibility: visible; pointer-events: auto; }

.nav-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity .45s var(--ease-in-out);
}
.nav-overlay.is-open .nav-overlay__backdrop { opacity: 1; }

.nav-overlay__panel {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem var(--pad-x);
  pointer-events: none;
}
.nav-overlay__panel a,
.nav-overlay__panel .nav-close {
  pointer-events: auto;
}

.nav-close {
  position: absolute;
  top: 1.3rem;
  right: var(--pad-x);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text);
  opacity: 0;
  transform: scale(.7) rotate(-45deg);
  transition: opacity .4s var(--ease-out) .15s, transform .4s var(--ease-out) .15s, background .25s var(--ease-out);
}
.nav-close:hover { background: var(--surface-2); }
.nav-overlay.is-open .nav-close { opacity: 1; transform: scale(1) rotate(0); }

.nav-list { list-style: none; display: flex; flex-direction: column; }
.nav-list li {
  overflow: hidden;
}
.nav-list a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: .7rem 0;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .5s var(--ease-out), transform .5s var(--ease-out), color .25s var(--ease-out), gap .3s var(--ease-out);
  transition-delay: calc(var(--i) * 55ms);
}
.nav-overlay.is-open .nav-list a { opacity: 1; transform: translateY(0); }

.nav-list__title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}
.nav-list__desc {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-faint);
  letter-spacing: .01em;
}
.nav-list a:hover { color: var(--text-muted); gap: 1.6rem; }
.nav-list a:hover .nav-list__title { color: var(--text); }

/* current-page indicator */
.nav-list a.is-current { border-bottom-color: var(--text-faint); }
.nav-list a.is-current .nav-list__title { color: var(--text-muted); }
.nav-list a.is-current .nav-list__desc::after { content: " · here"; }

.nav-overlay__footer {
  display: flex;
  justify-content: space-between;
  padding-top: 2rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-faint);
  opacity: 0;
  transition: opacity .6s var(--ease-out) .4s;
}
.nav-overlay.is-open .nav-overlay__footer { opacity: 1; }

/* ---------------- hero ---------------- */

.hero {
  position: relative;
  min-height: 78svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1.6rem;
  padding: 6rem var(--pad-x);
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20%;
  z-index: -1;
  background: radial-gradient(560px circle at var(--x, 50%) var(--y, 30%), color-mix(in srgb, var(--text) 8%, transparent), transparent 62%);
  transition: opacity .3s;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(var(--bg) 0%, transparent 12%, transparent 88%, var(--bg) 100%),
    repeating-linear-gradient(0deg, color-mix(in srgb, var(--text) 5%, transparent) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--text) 5%, transparent) 0 1px, transparent 1px 64px);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.hero__title {
  font-size: var(--fs-hero);
  max-width: 16ch;
}

/* ---------------- buttons ---------------- */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  padding: .85rem 1.6rem;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 500;
  text-decoration: none;
  overflow: hidden;
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out);
}
.btn svg { transition: transform .35s var(--ease-out); }
.btn:hover { transform: translateY(-2px); }
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  color: var(--on-shine);
  background: linear-gradient(120deg, var(--shine-1), var(--shine-2));
  box-shadow: 0 1px 0 0 color-mix(in srgb, var(--text) 25%, transparent) inset, 0 8px 24px -12px rgba(0,0,0,.6);
}
.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 20%, color-mix(in srgb, var(--on-shine) 35%, transparent) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform .7s var(--ease-out);
}
.btn--primary:hover::before { transform: translateX(120%); }

.btn--ghost {
  border: 1px solid var(--border-strong);
  padding: .6rem 1.2rem;
  font-size: .88rem;
}
.btn--ghost:hover { background: var(--surface-2); border-color: var(--text-faint); }

/* ---------------- sections ---------------- */

.section {
  padding: var(--pad-y) var(--pad-x);
  max-width: 1180px;
  margin: 0 auto;
}
.section--alt { background: var(--bg-soft); max-width: none; }
.section--alt > * { max-width: 1180px; margin-left: auto; margin-right: auto; }

/* standalone page sections get a little extra breathing room under the sticky header */
.page-section { padding-top: clamp(3.5rem, 7vw, 6rem); min-height: calc(100svh - 140px); }

.section-title { font-size: var(--fs-h2); margin-top: .6rem; max-width: 14ch; }
.section-lede {
  font-size: var(--fs-lede);
  color: var(--text-muted);
  max-width: 56ch;
  margin-top: 1.1rem;
}

/* ---------------- grid + cards ---------------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}
.grid--tight { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); max-width: 640px; }

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.75rem;
  transition: transform .4s var(--ease-out), border-color .4s var(--ease-out), background .4s var(--ease-out);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--text-faint);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: .2rem .6rem;
  margin-bottom: 1rem;
}
.card h3 { font-size: 1.15rem; margin-bottom: .5rem; }
.card p { color: var(--text-muted); font-size: .92rem; }

.card__link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin-top: 1.2rem;
  font-size: .88rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text);
}
.card__link svg { transition: transform .3s var(--ease-out); }
.card__link:hover svg { transform: translateX(3px); }

.card--download {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.4rem 1.6rem;
}
.card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--surface-2);
  flex-shrink: 0;
}
.card__body { flex: 1; }
.card__body h3 { font-size: 1rem; margin-bottom: .15rem; }
.card__body p { font-size: .82rem; color: var(--text-faint); }

/* ---------------- contact ---------------- */

.email-copy {
  margin-top: 2rem;
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  padding: .9rem 1.4rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .95rem;
  transition: background .3s var(--ease-out), transform .3s var(--ease-out);
}
.email-copy:hover { background: var(--surface-2); transform: translateY(-2px); }
.email-copy svg { color: var(--text-faint); }

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  margin-top: 1.4rem;
}
.social-link {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  padding: .75rem 1.35rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  text-decoration: none;
  font-size: .92rem;
  font-weight: 500;
  transition: background .3s var(--ease-out), transform .3s var(--ease-out), border-color .3s var(--ease-out);
}
.social-link:hover {
  background: var(--surface-2);
  transform: translateY(-2px);
  border-color: var(--text-faint);
}
.social-link__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  transition: color .3s var(--ease-out);
}
.social-link:hover .social-link__icon { color: var(--text); }

/* ---------------- footer ---------------- */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem var(--pad-x);
  border-top: 1px solid var(--border);
  font-size: .85rem;
  color: var(--text-faint);
}

/* ---------------- scroll reveal ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.hero .reveal { transition-delay: calc(var(--r-i, 0) * 90ms); }

/* ---------------- responsive ---------------- */

@media (max-width: 640px) {
  .site-footer { flex-direction: column; gap: .75rem; text-align: center; }
  .card--download { flex-wrap: wrap; }
  .card--download .btn--ghost { width: 100%; text-align: center; justify-content: center; }
}

/* ---------------- motion & pointer preferences ---------------- */

@media (hover: none) {
  .hero::before { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .nav-list a { transform: none; }
}