/* =========================================================
   Mojtaba MofidiNejad — Portfolio
   Design language: Light + Blue + Gaming + Premium
   ========================================================= */

:root {
  /* Color */
  --bg: #F6F9FF;
  --surface: #FFFFFF;
  --surface-alt: #EEF3FF;
  --ink: #0A1A3C;
  --ink-soft: #48577C;
  --ink-faint: #8593B4;
  --primary: #2454FF;
  --primary-deep: #12318F;
  --accent-glow: #7AA2FF;
  --border: #DCE6FA;
  --white: #FFFFFF;

  /* Type — self-hosted brand fonts (assets/fonts/, see css/fonts.css),
     then a full system fallback stack so the page never breaks if a
     font file fails to load. No remote/CDN font requests. */
  --font-en: "Poppins", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-fa: "Vazirmatn", Tahoma, "Segoe UI", system-ui, sans-serif;
  --font-base: var(--font-en);

  /* Scale */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.08rem);
  --step-1: clamp(1.2rem, 1.12rem + 0.4vw, 1.4rem);
  --step-2: clamp(1.5rem, 1.3rem + 0.9vw, 1.9rem);
  --step-3: clamp(2rem, 1.6rem + 1.8vw, 2.7rem);
  --step-4: clamp(2.6rem, 2rem + 2.8vw, 3.8rem);
  --step-5: clamp(3.2rem, 2.3rem + 4.2vw, 5.2rem);

  /* Layout */
  --container-w: 1180px;
  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 28px;
  --nav-h: 76px;

  /* Motion */
  --ease: cubic-bezier(.22,.8,.32,1);
  --dur-s: .22s;
  --dur-m: .5s;
  --dur-l: .9s;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-base);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
html[dir="rtl"] body { --font-base: var(--font-fa); }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }
button { font: inherit; background: none; border: none; cursor: pointer; color: inherit; }

.skip-link {
  position: fixed; top: -100px; left: 1rem; z-index: 1000;
  background: var(--primary); color: #fff; padding: .7rem 1.1rem;
  border-radius: var(--radius-s); transition: top var(--dur-s) var(--ease);
}
.skip-link:focus { top: 1rem; }

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

.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

/* ---------- Sections ---------- */
.section { padding-block: clamp(4rem, 9vw, 7.5rem); }
.section--alt { background: var(--surface-alt); }
.section--contact { background: var(--ink); color: #fff; }

.section__head { max-width: 640px; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.eyebrow {
  color: var(--primary);
  font-weight: 600;
  font-size: var(--step--1);
  margin: 0 0 .6rem;
}
.section--contact .eyebrow { color: var(--accent-glow); }
.section__head h2, .contact h2 {
  font-size: var(--step-3);
  line-height: 1.15;
}

/* ---------- Nav ---------- */
.site-header {
  position: fixed; inset-inline: 0; top: 0; z-index: 100;
  height: var(--nav-h);
  transition: background var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease), border-color var(--dur-s) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(246, 249, 255, 0.78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--border);
  box-shadow: 0 8px 30px -20px rgba(10,26,60,.35);
}
.nav {
  height: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
  display: flex; align-items: center; gap: 1.5rem;
}
.nav__brand { font-weight: 700; font-size: var(--step-0); margin-inline-end: auto; white-space: nowrap; }
.nav__menu { display: flex; align-items: center; gap: clamp(1rem, 2vw, 1.8rem); }
.nav__menu a {
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--ink-soft);
  position: relative;
  padding-block: .3rem;
}
.nav__menu a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--primary); transform: scaleX(0); transform-origin: center;
  transition: transform var(--dur-s) var(--ease);
}
.nav__menu a:hover, .nav__menu a.is-active { color: var(--ink); }
.nav__menu a:hover::after, .nav__menu a.is-active::after { transform: scaleX(1); }

.nav__actions { display: flex; align-items: center; gap: .9rem; }
.nav__icon-link {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 50%;
  color: var(--ink-soft); background: var(--surface);
  border: 1px solid var(--border);
  transition: color var(--dur-s), border-color var(--dur-s), transform var(--dur-s);
}
.nav__icon-link:hover { color: var(--primary); border-color: var(--primary); transform: translateY(-2px); }

.lang-switch {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: .45rem .9rem;
  border-radius: 999px;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--primary-deep);
  transition: border-color var(--dur-s), background var(--dur-s);
}
.lang-switch:hover { border-color: var(--primary); background: var(--surface-alt); }

.nav__toggle {
  display: none;
  width: 40px; height: 40px;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav__toggle span { width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform var(--dur-s) var(--ease), opacity var(--dur-s); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
  background:
    radial-gradient(60% 55% at 82% 28%, rgba(122,162,255,.28), transparent 70%),
    radial-gradient(45% 40% at 15% 85%, rgba(36,84,255,.12), transparent 70%),
    var(--bg);
}
.hero__content {
  position: relative; z-index: 2;
  padding-inline: clamp(1.25rem, 5vw, 4.5rem);
  max-width: 640px;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-weight: 700; font-size: var(--step--1);
  color: var(--primary-deep);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: .5rem 1rem;
  border-radius: 999px;
  margin-bottom: 1.4rem;
}
.hero__eyebrow::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--primary); box-shadow: 0 0 0 4px rgba(36,84,255,.18);
}
.hero__name {
  font-size: var(--step-5);
  line-height: .98;
  color: var(--ink);
  margin-bottom: 1.3rem;
}
.hero__statement {
  font-size: var(--step-1);
  color: var(--ink-soft);
  max-width: 46ch;
  margin-bottom: 2.2rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 1.25rem 1.5rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .95rem 1.7rem;
  border-radius: 999px;
  font-weight: 600; font-size: var(--step--1);
  transition: transform var(--dur-s) var(--ease), box-shadow var(--dur-s) var(--ease), background var(--dur-s), color var(--dur-s), border-color var(--dur-s);
}
.btn--primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 14px 30px -12px rgba(36,84,255,.55);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px -12px rgba(36,84,255,.6); }
.btn--ghost {
  background: transparent; color: var(--ink);
  border: 1px solid var(--border);
}
.btn--ghost:hover { border-color: var(--primary); color: var(--primary-deep); transform: translateY(-2px); }
.section--contact .btn--ghost { border-color: rgba(255,255,255,.3); color: #fff; }

.hero__scroll-hint {
  position: absolute; z-index: 2;
  inset-inline-start: clamp(1.25rem, 5vw, 4.5rem);
  bottom: 2.4rem;
  display: flex; flex-direction: column; align-items: center; gap: .6rem;
  font-size: var(--step--1); color: var(--ink-faint); font-weight: 600;
}
.hero__scroll-line {
  width: 1px; height: 34px; background: linear-gradient(var(--primary), transparent);
}

/* ---------- Hero 3D scene ---------- */
.hero__scene {
  position: relative; z-index: 1;
  height: 100%;
  perspective: 1400px;
}
.scene__layer { position: absolute; inset: 0; transform-style: preserve-3d; }

.die, .cube {
  position: absolute;
  width: var(--s, 88px); height: var(--s, 88px);
  transform-style: preserve-3d;
}
.die span, .cube span {
  position: absolute; inset: 0;
  background: linear-gradient(155deg, var(--surface), var(--surface-alt));
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: inset 0 0 24px rgba(36,84,255,.06);
}

/* ---------- Die pips (dot patterns) ----------
   Opposite faces sum to 7, like a real die:
   front=1 / back=6, right=3 / left=4, top=2 / bottom=5 */
.die span {
  --pip: var(--primary-deep);
  --pip-tl: radial-gradient(circle at 24% 24%, var(--pip) 0 15%, transparent 16%);
  --pip-tr: radial-gradient(circle at 76% 24%, var(--pip) 0 15%, transparent 16%);
  --pip-ml: radial-gradient(circle at 24% 50%, var(--pip) 0 15%, transparent 16%);
  --pip-mr: radial-gradient(circle at 76% 50%, var(--pip) 0 15%, transparent 16%);
  --pip-bl: radial-gradient(circle at 24% 76%, var(--pip) 0 15%, transparent 16%);
  --pip-br: radial-gradient(circle at 76% 76%, var(--pip) 0 15%, transparent 16%);
  --pip-c:  radial-gradient(circle at 50% 50%, var(--pip) 0 15%, transparent 16%);
  background-repeat: no-repeat;
}
.die span:nth-child(1) {
  transform: translateZ(calc(var(--s, 88px) / 2));
  background-image: var(--pip-c), linear-gradient(155deg, var(--surface), var(--surface-alt));
}
.die span:nth-child(2) {
  transform: rotateY(180deg) translateZ(calc(var(--s, 88px) / 2));
  background-image: var(--pip-tl), var(--pip-tr), var(--pip-ml), var(--pip-mr), var(--pip-bl), var(--pip-br),
    linear-gradient(155deg, var(--surface), var(--surface-alt));
}
.die span:nth-child(3) {
  transform: rotateY(90deg) translateZ(calc(var(--s, 88px) / 2));
  background-image: var(--pip-tl), var(--pip-c), var(--pip-br), linear-gradient(155deg, #E3ECFF, var(--surface-alt));
}
.die span:nth-child(4) {
  transform: rotateY(-90deg) translateZ(calc(var(--s, 88px) / 2));
  background-image: var(--pip-tl), var(--pip-tr), var(--pip-bl), var(--pip-br), linear-gradient(155deg, #E3ECFF, var(--surface-alt));
}
.die span:nth-child(5) {
  transform: rotateX(90deg) translateZ(calc(var(--s, 88px) / 2));
  background-image: var(--pip-tl), var(--pip-tr), linear-gradient(155deg, #F3F7FF, var(--surface));
}
.die span:nth-child(6) {
  transform: rotateX(-90deg) translateZ(calc(var(--s, 88px) / 2));
  background-image: var(--pip-tl), var(--pip-tr), var(--pip-c), var(--pip-bl), var(--pip-br),
    linear-gradient(155deg, #D9E5FF, var(--surface-alt));
}

.cube span { border-radius: 6px; }
.cube span:nth-child(1) { transform: translateZ(calc(var(--s, 60px) / 2)); background: linear-gradient(155deg, var(--primary), var(--primary-deep)); border-color: transparent; }
.cube span:nth-child(2) { transform: rotateY(180deg) translateZ(calc(var(--s, 60px) / 2)); background: linear-gradient(155deg, var(--primary-deep), #0A1E63); border-color: transparent; }
.cube span:nth-child(3) { transform: rotateY(90deg) translateZ(calc(var(--s, 60px) / 2)); background: linear-gradient(155deg, var(--accent-glow), var(--primary)); border-color: transparent; }
.cube span:nth-child(4) { transform: rotateY(-90deg) translateZ(calc(var(--s, 60px) / 2)); background: linear-gradient(155deg, var(--accent-glow), var(--primary)); border-color: transparent; }
.cube span:nth-child(5) { transform: rotateX(90deg) translateZ(calc(var(--s, 60px) / 2)); background: linear-gradient(155deg, #9DBBFF, var(--accent-glow)); border-color: transparent; }
.cube span:nth-child(6) { transform: rotateX(-90deg) translateZ(calc(var(--s, 60px) / 2)); background: linear-gradient(155deg, #1E3FCC, var(--primary-deep)); border-color: transparent; }

.card-chip {
  position: absolute;
  width: 74px; height: 100px;
  border-radius: 12px;
  background: linear-gradient(160deg, var(--surface), var(--surface-alt));
  border: 1px solid var(--border);
  box-shadow: 0 20px 40px -20px rgba(10,26,60,.35);
}
.card-chip::before {
  content: ""; position: absolute; inset: 10px;
  border: 1.5px dashed var(--accent-glow); border-radius: 8px; opacity: .6;
}

.die--a  { --s: 96px; top: 12%; inset-inline-end: 18%; }
.die--b  { --s: 56px; bottom: 16%; inset-inline-end: 38%; }
.cube--a { --s: 64px; top: 42%; inset-inline-end: 6%; }
.cube--b { --s: 42px; bottom: 30%; inset-inline-end: 62%; }
.card-chip--a { top: 26%; inset-inline-end: 46%; transform: rotate(-8deg); }
.card-chip--b { bottom: 10%; inset-inline-end: 12%; transform: rotate(10deg); }

/* ---------- About ---------- */
.about__body { display: grid; grid-template-columns: 240px 1.4fr 1fr; align-items: start; gap: clamp(2rem, 5vw, 4rem); }
.about__media { display: flex; justify-content: center; }
.about__photo-frame {
  position: relative;
  width: 100%;
  max-width: 240px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 48px -28px rgba(10,26,60,.4);
  background: linear-gradient(155deg, var(--primary), var(--primary-deep));
}
.about__photo-frame img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about__photo-fallback {
  position: absolute; inset: 0;
  display: none; align-items: center; justify-content: center;
  font-family: var(--font-en);
  font-size: clamp(2.4rem, 6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: .04em;
  color: #fff;
}
.about__text p {
  color: var(--ink-soft);
  font-size: var(--step-0);
  max-width: 62ch;
}
.about__text p + p { margin-top: 1.2rem; }
.about__highlights { display: flex; flex-direction: column; gap: 1rem; }
.about__highlights li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 1.1rem 1.3rem;
}
.about__highlights .h-label { display: block; font-size: var(--step--1); color: var(--ink-faint); font-weight: 600; margin-bottom: .25rem; }
.about__highlights .h-value { font-weight: 700; color: var(--ink); }

/* ---------- Timeline (Experience) ---------- */
.timeline { position: relative; max-width: 820px; }
.timeline::before {
  content: ""; position: absolute; inset-inline-start: 9px; top: 6px; bottom: 6px;
  width: 2px; background: var(--border);
}
.timeline-item { position: relative; padding-inline-start: 2.6rem; padding-bottom: 2.6rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; inset-inline-start: 0; top: 6px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--primary);
}
.timeline-item[data-stage="production"]::before { background: var(--primary); }
.timeline-item__meta { display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: baseline; margin-bottom: .4rem; }
.timeline-item__role { font-weight: 700; font-size: var(--step-1); }
.timeline-item__company { color: var(--primary-deep); font-weight: 600; }
.timeline-item__dates { color: var(--ink-faint); font-size: var(--step--1); margin-inline-start: auto; }
.timeline-item__location { color: var(--ink-faint); font-size: var(--step--1); }
.timeline-item__desc { color: var(--ink-soft); max-width: 62ch; margin-top: .5rem; }
.timeline-item__resp { margin-top: .7rem; display: flex; flex-direction: column; gap: .35rem; }
.timeline-item__resp li { position: relative; padding-inline-start: 1.1rem; color: var(--ink-soft); font-size: var(--step--1); }
.timeline-item__resp li::before { content: "–"; position: absolute; inset-inline-start: 0; color: var(--accent-glow); }

/* ---------- Projects ---------- */
.project-filters { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 2rem; }
.project-filters button {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: .5rem 1rem;
  border-radius: 999px;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--ink-soft);
  transition: all var(--dur-s) var(--ease);
}
.project-filters button:hover { border-color: var(--primary); color: var(--primary-deep); }
.project-filters button.is-active { background: var(--primary); border-color: var(--primary); color: #fff; }

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.6rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  overflow: hidden;
  transition: transform var(--dur-m) var(--ease), box-shadow var(--dur-m) var(--ease), border-color var(--dur-m);
}
.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 50px -28px rgba(10,26,60,.4);
  border-color: var(--accent-glow);
}
.project-card__media {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--surface-alt), #E3ECFF);
  position: relative;
  overflow: hidden;
}
.project-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-l) var(--ease); }
.project-card:hover .project-card__media img { transform: scale(1.06); }
.project-card__media .media-fallback {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--ink-faint); font-size: var(--step--1); font-weight: 600; text-align: center; padding: 1rem;
}
.project-card__body { padding: 1.4rem 1.5rem 1.6rem; }
.project-card__title { font-size: var(--step-1); margin-bottom: .4rem; }
.project-card__desc { color: var(--ink-soft); font-size: var(--step--1); margin-bottom: 1rem; }
.project-card__tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1rem; }
.project-card__tags span {
  font-size: .72rem; font-weight: 700; letter-spacing: .02em;
  color: var(--primary-deep); background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: .25rem .6rem; border-radius: 999px;
}
.project-card__link { font-size: var(--step--1); font-weight: 700; color: var(--primary); }

/* ---------- Skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.6rem; }
.skill-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m); padding: 1.6rem; }
.skill-card h3 { font-size: var(--step-0); margin-bottom: 1rem; }
.skill-card ul { display: flex; flex-wrap: wrap; gap: .5rem; }
.skill-card li {
  font-size: var(--step--1); font-weight: 600;
  background: var(--surface-alt); border: 1px solid var(--border);
  padding: .4rem .85rem; border-radius: 999px; color: var(--ink);
}

/* ---------- Education ---------- */
.education-list { display: flex; flex-direction: column; gap: 1.2rem; max-width: 760px; }
.education-item {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m);
  padding: 1.4rem 1.6rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.education-item__main .degree { font-weight: 700; font-size: var(--step-0); }
.education-item__main .institution { color: var(--primary-deep); font-weight: 600; margin-top: .2rem; }
.education-item__main .desc { color: var(--ink-soft); font-size: var(--step--1); margin-top: .4rem; }
.education-item__dates { color: var(--ink-faint); font-size: var(--step--1); white-space: nowrap; }

/* ---------- Contact ---------- */
.contact { text-align: center; max-width: 680px; }
.contact h2 { color: #fff; }
.contact__subtext { color: rgba(255,255,255,.7); margin-block: 1.2rem 2.2rem; font-size: var(--step-1); }
.contact__links { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; }
.contact__links a {
  display: inline-flex; align-items: center; gap: .6rem;
  border: 1px solid rgba(255,255,255,.2);
  padding: .85rem 1.5rem; border-radius: 999px;
  font-weight: 600; font-size: var(--step--1);
  transition: all var(--dur-s) var(--ease);
}
.contact__links a:hover { background: #fff; color: var(--ink); transform: translateY(-2px); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding-block: 2rem; }
.site-footer__inner { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; color: var(--ink-faint); font-size: var(--step--1); }

.back-to-top {
  position: fixed; inset-inline-end: 1.4rem; bottom: 1.4rem; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: grid; place-items: center;
  box-shadow: 0 14px 30px -14px rgba(36,84,255,.6);
  opacity: 0; pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--dur-s) var(--ease), transform var(--dur-s) var(--ease);
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }