:root,
html[data-theme="dark"] {
  --bg: #13141c;
  --bg-soft: #191b26;
  --card: #1d2030;
  --text: #ecEAE4;
  --text-dim: #9a9cae;
  --line: rgba(236, 234, 228, 0.09);
  --accent: #ff9a52;
  --accent-text: #1a1206;
}

html[data-theme="light"] {
  --bg: #f6f4ef;
  --bg-soft: #efece4;
  --card: #ffffff;
  --text: #1b1c22;
  --text-dim: #6b6c78;
  --line: rgba(27, 28, 34, 0.09);
  --accent: #e8722c;
  --accent-text: #fff8f0;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Vazirmatn', sans-serif;
  direction: rtl;
  transition: background 0.4s ease, color 0.4s ease;
}

.display { font-family: 'Vazirmatn', sans-serif; font-weight: 700; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}
.nav-mark { font-weight: 600; font-size: 15px; letter-spacing: 0.2px; }
.nav-mark span { color: var(--accent); }
.theme-btn {
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-soft);
  color: var(--text); display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: transform 0.25s ease, border-color 0.25s ease;
  position: relative;
}
.theme-btn:hover { border-color: var(--accent); transform: rotate(14deg); }
.theme-btn .icon-sun, .theme-btn .icon-moon {
  position: absolute; display: flex; transition: opacity 0.2s ease, transform 0.2s ease;
}
html[data-theme="dark"] .icon-sun { opacity: 1; transform: scale(1); }
html[data-theme="dark"] .icon-moon { opacity: 0; transform: scale(0.5); }
html[data-theme="light"] .icon-sun { opacity: 0; transform: scale(0.5); }
html[data-theme="light"] .icon-moon { opacity: 1; transform: scale(1); }

/* HERO */
.hero { padding: 88px 0 70px; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-dim); margin-bottom: 22px;
}
.hero-eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 22px;
  max-width: 780px;
}
.hero p.lead {
  font-size: 17px; line-height: 1.9; color: var(--text-dim);
  max-width: 540px; margin: 0 0 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.btn-primary {
  background: var(--accent); color: var(--accent-text);
  padding: 13px 22px; border-radius: 11px; font-weight: 600; font-size: 14.5px;
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; border: none; cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px -8px var(--accent); }
.icon-link {
  width: 42px; height: 42px; border-radius: 11px; border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; color: var(--text);
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.icon-link:hover { border-color: var(--accent); transform: translateY(-2px); }

.stats-row {
  display: flex; gap: 44px; margin-top: 64px; flex-wrap: wrap;
  border-top: 1px solid var(--line); padding-top: 30px;
}
.stat .num { font-family: 'Vazirmatn', sans-serif; font-size: 30px; font-weight: 700; color: var(--accent); }
.stat .lbl { font-size: 13.5px; color: var(--text-dim); margin-top: 2px; }
.stat .lbl.loc { display: flex; align-items: center; gap: 6px; margin-top: 4px; }

/* SECTION HEADS */
.sec { padding: 76px 0; border-top: 1px solid var(--line); }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 40px; gap: 20px; flex-wrap: wrap; }
.sec-head h2 { font-size: 28px; font-weight: 700; margin: 0; letter-spacing: 0; }
.sec-head .num { color: var(--text-dim); font-size: 14px; }

/* SKILLS */
.skills-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.skill-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 24px; text-align: right; transition: border-color 0.25s ease, transform 0.25s ease, opacity 0.7s cubic-bezier(.22,1,.36,1), transform 0.7s cubic-bezier(.22,1,.36,1);
}
.skill-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.skill-card svg { color: var(--accent); margin-bottom: 14px; display: block; margin-inline-start: auto; }
.skill-card h4 { margin: 0 0 8px; font-size: 15.5px; font-weight: 600; }
.skill-card p { margin: 0; font-size: 13.5px; color: var(--text-dim); line-height: 1.6; }

/* EXPERIENCE */
.timeline { position: relative; padding-inline-end: 28px; padding-inline-start: 0; }
.timeline::before {
  content: ''; position: absolute; inset-inline-end: 5px; top: 8px; bottom: 8px; width: 1px;
  background: var(--line);
}
.tl-item { position: relative; padding-bottom: 40px; text-align: right; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute; inset-inline-end: -28px; top: 6px; width: 11px; height: 11px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.tl-period { font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 6px; letter-spacing: 0.02em; }
.tl-item h3 { margin: 0 0 4px; font-size: 19px; font-weight: 600; }
.tl-org { color: var(--text-dim); font-size: 14px; margin-bottom: 10px; }
.tl-item p { margin: 0; margin-inline-start: auto; color: var(--text-dim); font-size: 14.5px; line-height: 1.7; max-width: 560px; }

/* PROJECTS */
.proj-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; perspective: 1200px; }
.proj-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  overflow: hidden; text-align: right; transition: transform 0.5s cubic-bezier(.22,1,.36,1), opacity 0.6s ease, border-color 0.3s ease;
  transform-style: preserve-3d; cursor: pointer;
}
.proj-card:hover { border-color: var(--accent); }
.proj-media { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.proj-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.7s cubic-bezier(.22,1,.36,1);
  filter: saturate(0.92);
}
.proj-card:hover .proj-media img { transform: scale(1.08); }
.proj-media-veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, color-mix(in srgb, var(--card) 90%, transparent) 100%);
}
.proj-body { padding: 22px 24px 26px; }
.proj-tag { font-size: 12px; color: var(--accent); font-weight: 600; }
.proj-body h3 { margin: 10px 0 8px; font-size: 20px; font-weight: 600; }
.proj-body p { margin: 0 0 14px; font-size: 14px; color: var(--text-dim); line-height: 1.7; }
.proj-link { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; font-weight: 600; color: var(--text); }
.proj-card:hover .proj-link { color: var(--accent); }

/* FOOTER */
.footer { padding: 60px 0 50px; text-align: center; }
.footer h2 { font-size: clamp(24px, 4.5vw, 36px); margin: 0 0 18px; font-weight: 700; line-height: 1.5; }
.footer p { color: var(--text-dim); margin: 0 0 28px; }
.foot-bottom {
  margin-top: 60px; padding-top: 24px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; font-size: 13px; color: var(--text-dim);
  flex-wrap: wrap; gap: 10px;
}

/* SCROLL REVEAL (JS toggles .is-visible) */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(.22,1,.36,1), transform 0.7s cubic-bezier(.22,1,.36,1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.proj-card.reveal { transform: translateY(30px); }
.proj-card.reveal.is-visible { transform: translateY(0); }

@media (max-width: 760px) {
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .proj-grid { grid-template-columns: 1fr; }
  .hero { padding: 60px 0 50px; }
  .sec { padding: 54px 0; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}
/* proj-card is now an <a> */
.proj-card {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* CASE STUDY PAGE */
.case-wrap { padding-bottom: 80px; }

.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-dim); text-decoration: none; font-size: 14px;
  margin-top: 32px; margin-bottom: 36px;
  transition: color 0.2s ease, gap 0.2s ease;
}
.back-link svg { transform: scaleX(-1); }
.back-link:hover { color: var(--accent); gap: 10px; }

.case-head { margin-bottom: 36px; }
.case-head h1 {
  font-size: clamp(32px, 5.5vw, 48px);
  font-weight: 700;
  margin: 14px 0 16px;
  line-height: 1.3;
}
.case-lead {
  font-size: 17px; line-height: 1.9; color: var(--text-dim);
  max-width: 620px; margin: 0 0 32px;
}

.case-meta {
  display: flex; gap: 48px; flex-wrap: wrap;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
.case-meta-item { display: flex; flex-direction: column; gap: 10px; }
.case-meta-label { font-size: 12.5px; color: var(--text-dim); }
.case-meta-value { font-size: 15px; font-weight: 600; }
.case-tech { display: flex; gap: 8px; flex-wrap: wrap; }
.tech-chip {
  background: var(--card); border: 1px solid var(--line);
  padding: 6px 12px; border-radius: 20px; font-size: 13px; color: var(--text);
}

.case-hero {
  border-radius: 20px; overflow: hidden; margin: 40px 0;
  aspect-ratio: 16/9; border: 1px solid var(--line);
}
.case-hero img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.92); }

.case-body { max-width: 680px; margin: 0 0 56px; }
.case-body h2 { font-size: 24px; font-weight: 700; margin: 0 0 16px; }
.case-body p { font-size: 15.5px; line-height: 1.95; color: var(--text-dim); }

.case-gallery {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 56px;
}
.case-gallery-item {
  border-radius: 16px; overflow: hidden; border: 1px solid var(--line);
  aspect-ratio: 16/9;
  background: var(--card);
}
.case-gallery-item img {
  width: 100%; height: 100%; object-fit: contain;
  transition: transform 0.6s cubic-bezier(.22,1,.36,1);
  filter: saturate(0.92);
}
.case-gallery-item:hover img { transform: scale(1.06); }

.case-nav { text-align: center; padding: 20px 0 40px; }

@media (max-width: 700px) {
  .case-gallery { grid-template-columns: 1fr; }
  .case-meta { gap: 28px; }
}