/* ============================================================
   Shared styles — Kareem Elkhatib portfolio
   Layout · nav · footer · components · motion
   Depends on tokens.css (load first).
   ============================================================ */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin: 0;
  font-optical-sizing: auto;
}

p { margin: 0 0 var(--space-sm); }

/* Faint paper grain — the one cinematic texture, applied site-wide */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(var(--space-xl), 12vh, var(--space-2xl)); position: relative; z-index: 2; }
.section--tight { padding-block: var(--space-xl); }

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-weight: 600;
  color: var(--bronze);
  margin: 0 0 var(--space-md);
  display: inline-flex;
  align-items: center;
  gap: 0.75em;
}
.eyebrow::before {
  content: "";
  width: 2.2em;
  height: 1px;
  background: var(--bronze);
  opacity: 0.6;
}

.lead {
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: var(--measure);
  font-weight: 350;
}

.muted { color: var(--ink-faint); }
.serif { font-family: var(--font-display); }
.accent { color: var(--bronze); }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  display: inline-flex;
  align-items: center;
  gap: 0.65em;
  padding: 0.85em 1.6em;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  border: 1px solid var(--btn-bg);
  transition: background var(--dur-fast) var(--ease-soft),
              color var(--dur-fast) var(--ease-soft),
              transform var(--dur-fast) var(--ease-soft);
}
.btn:hover { transform: translateY(-2px); }
.btn .arrow { transition: transform var(--dur-fast) var(--ease-out); }
.btn:hover .arrow { transform: translateX(4px); }

.btn--accent { --btn-bg: var(--bronze); --btn-fg: #fff; }
.btn--accent:hover { --btn-bg: var(--bronze-deep); border-color: var(--bronze-deep); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--sand);
}
.btn--ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* Quiet text link with animated underline */
.link-underline {
  position: relative;
  font-weight: 600;
  color: var(--ink);
  padding-bottom: 2px;
}
.link-underline::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--bronze);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}
.link-underline:hover::after { transform: scaleX(1); }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-med) var(--ease-soft);
}
.nav.is-scrolled { border-bottom-color: var(--line); }

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.32rem;
  letter-spacing: -0.01em;
  font-weight: 500;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5ch;
}
.brand .brand__dot { color: var(--bronze); }

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.5vw, 2.6rem);
  list-style: none;
  margin: 0; padding: 0;
}
.nav__link {
  position: relative;
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding: 0.4em 0;
  transition: color var(--dur-fast) var(--ease-soft);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--bronze);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}
.nav__link:hover { color: var(--ink); }
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__link[aria-current="page"] { color: var(--ink); }

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  background: none; border: 0; cursor: pointer;
  padding: 10px;
}
.nav__toggle span {
  display: block; height: 1.5px; width: 100%;
  background: var(--ink);
  transition: transform var(--dur-fast) var(--ease-soft),
              opacity var(--dur-fast) var(--ease-soft);
}
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 720px) {
  /* Push the hamburger to the right edge. The Primary <nav> wrapper stays
     in flex flow as a zero-width item once .nav__links goes position:fixed,
     so space-between alone would strand the toggle in the middle. */
  .nav__toggle { display: flex; margin-left: auto; }
  .nav__links {
    position: fixed;
    inset: 76px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: var(--space-sm) var(--gutter) var(--space-md);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-med) var(--ease-soft),
                transform var(--dur-med) var(--ease-soft);
  }
  .nav.is-open .nav__links { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav__link { width: 100%; padding: 0.9em 0; font-size: var(--step-1); border-bottom: 1px solid var(--line); }
  .nav__link::after { display: none; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  position: relative;
  z-index: 2;
  background: var(--ink);
  color: var(--paper);
  padding-block: var(--space-xl) var(--space-md);
}
.footer a { color: var(--paper); }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}
.footer__name { font-family: var(--font-display); font-size: var(--step-2); margin-bottom: var(--space-xs); }
.footer__tag { color: color-mix(in srgb, var(--paper) 60%, transparent); max-width: 32ch; }
.footer__col h4 {
  font-family: var(--font-body);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--sand);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}
.footer__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.55em; }
.footer__col a {
  color: color-mix(in srgb, var(--paper) 78%, transparent);
  transition: color var(--dur-fast) var(--ease-soft);
}
.footer__col a:hover { color: var(--sand); }
.footer__base {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid color-mix(in srgb, var(--paper) 14%, transparent);
  font-size: var(--step--1);
  color: color-mix(in srgb, var(--paper) 55%, transparent);
}
@media (max-width: 720px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brandcol { grid-column: 1 / -1; }
}

/* ============================================================
   IMAGE / PLACEHOLDER frames
   ============================================================ */
.frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--sand-wash);
}
.frame img { width: 100%; height: 100%; object-fit: cover; }

/* Tasteful placeholder used until real photos are dropped in */
.frame--placeholder {
  display: grid;
  place-items: center;
  background:
    radial-gradient(120% 120% at 30% 20%, #f3ece0 0%, var(--sand-wash) 45%, #e3d6c2 100%);
}
.frame--placeholder::after {
  content: attr(data-label);
  font-family: var(--font-body);
  font-size: var(--step--1);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--bronze) 70%, var(--ink));
  opacity: 0.6;
}

/* ============================================================
   MOTION — scroll reveals (single, consistent effect)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }
/* Stagger children via inline --i (set in markup) */
.reveal[style*="--i"] { transition-delay: calc(var(--i) * 90ms); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}