/* ===== Variables — Dark (default) ===== */
:root,
[data-theme="dark"] {
  --bg: #0a0e17;
  --bg-elevated: #111827;
  --bg-card: rgba(17, 24, 39, 0.72);
  --header-bg: rgba(10, 14, 23, 0.75);
  --border: rgba(148, 163, 184, 0.12);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-gradient-end: #94a3b8;
  --accent: #22d3ee;
  --accent-secondary: #06b6d4;
  --accent-dim: rgba(34, 211, 238, 0.15);
  --accent-glow: rgba(34, 211, 238, 0.35);
  --mesh-1: rgba(34, 211, 238, 0.18);
  --mesh-2: rgba(99, 102, 241, 0.12);
  --mesh-3: rgba(16, 185, 129, 0.08);
  --photo-shadow: rgba(34, 211, 238, 0.25);
  --btn-primary-text: #0a0e17;
  --theme-color: #0a0e17;
}

/* ===== Light theme ===== */
[data-theme="light"] {
  --bg: #f1f5f9;
  --bg-elevated: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --header-bg: rgba(241, 245, 249, 0.85);
  --border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --text-muted: #475569;
  --text-gradient-end: #64748b;
  --accent: #0891b2;
  --accent-secondary: #0e7490;
  --accent-dim: rgba(8, 145, 178, 0.1);
  --accent-glow: rgba(8, 145, 178, 0.2);
  --mesh-1: rgba(8, 145, 178, 0.12);
  --mesh-2: rgba(99, 102, 241, 0.08);
  --mesh-3: rgba(16, 185, 129, 0.06);
  --photo-shadow: rgba(8, 145, 178, 0.2);
  --btn-primary-text: #ffffff;
  --theme-color: #f1f5f9;
}

:root {
  --font: "Vazir", "Vazir FD", Tahoma, system-ui, sans-serif;
  --mono: "Cascadia Code", "Fira Code", Consolas, monospace;
  --radius: 14px;
  --radius-lg: 20px;
  --header-h: 72px;
  --max-w: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
  height: auto;
}

strong {
  font-weight: 700;
  color: var(--text);
}

.mono {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--accent);
  direction: ltr;
  display: inline-block;
}

/* ===== Background ===== */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, var(--mesh-1), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 20%, var(--mesh-2), transparent 50%),
    radial-gradient(ellipse 50% 30% at 50% 100%, var(--mesh-3), transparent 45%);
  pointer-events: none;
  transition: background 0.35s var(--ease);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 75%);
  pointer-events: none;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.35s var(--ease), border-color 0.35s;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  transition: opacity 0.2s var(--ease);
}

.logo:hover {
  opacity: 0.85;
}

.logo-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  color: var(--btn-primary-text);
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 800;
}

.logo-text {
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.2s var(--ease);
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.05);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  grid-area: 1 / 1;
  transition: opacity 0.25s, transform 0.25s var(--ease);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0);
}

.nav {
  display: flex;
  gap: 1.35rem;
}

.nav a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color 0.2s var(--ease);
  position: relative;
  white-space: nowrap;
}

.nav a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  right: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.25s var(--ease);
  border-radius: 1px;
}

.nav a:hover {
  color: var(--text);
}

.nav a:hover::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

/* ===== Main layout ===== */
main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: calc(var(--header-h) + 3rem) clamp(1.25rem, 4vw, 2.5rem) 4rem;
}

/* ===== Hero ===== */
.hero {
  display: grid;
  grid-template-columns: 260px 1fr 280px;
  gap: 2.5rem;
  align-items: start;
  padding-bottom: 1.5rem;
  margin-bottom: 0.5rem;
}

.hero-photo {
  margin: 0;
}

.photo-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: 0 20px 50px var(--photo-shadow);
}

.photo-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(0, 0, 0, 0.35));
  z-index: 1;
  pointer-events: none;
}

[data-theme="light"] .photo-frame::before {
  background: linear-gradient(180deg, transparent 65%, rgba(15, 23, 42, 0.12));
}

.photo-frame img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center top;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
  padding: 0.35rem 0.9rem;
  background: var(--accent-dim);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 999px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-glow);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-bottom: 1.5rem;
}

.hero-name-fa {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text) 30%, var(--text-gradient-end) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-name-en {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  direction: ltr;
  text-align: right;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 36rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.2s, background 0.2s, border-color 0.2s;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: var(--btn-primary-text);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 12px 40px var(--accent-glow);
}

.btn-ghost {
  background: var(--bg-card);
  border-color: var(--border);
  color: var(--text);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  background: var(--accent-dim);
}

.hero-card {
  padding: 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: background 0.35s, border-color 0.35s;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.stat:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.stat-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.stack-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.stack-preview li {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.3rem 0.65rem;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  direction: ltr;
}

/* ===== Sections ===== */
.section {
  margin-bottom: 5rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-tag {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  opacity: 0.8;
  direction: ltr;
}

.section-header h2 {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* About */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2.5rem;
  align-items: start;
}

.about-text {
  display: grid;
  gap: 1.25rem;
}

.about-text p {
  color: var(--text-muted);
}

.about-quote {
  margin-top: 0.5rem;
  padding: 1.25rem 1.5rem;
  border-right: 3px solid var(--accent);
  background: var(--accent-dim);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

.about-quote span {
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 0.35rem;
}

.gallery {
  display: grid;
  gap: 1rem;
}

.gallery-item {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: transform 0.25s var(--ease), border-color 0.25s;
}

.gallery-item:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.skill-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.35s;
}

.skill-card:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  transform: translateY(-3px);
}

.skill-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.skill-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tags li {
  font-size: 0.78rem;
  font-family: var(--mono);
  padding: 0.25rem 0.6rem;
  background: color-mix(in srgb, var(--text-muted) 12%, transparent);
  color: var(--text-muted);
  border-radius: 6px;
  direction: ltr;
}

/* Timeline */
.timeline {
  position: relative;
  padding-right: 1.5rem;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-right: 2rem;
  padding-bottom: 2.5rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  right: -5px;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-glow);
  transition: background 0.35s;
}

.timeline-item time {
  display: block;
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 0.35rem;
  font-family: var(--mono);
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.timeline-org {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.timeline-content p:last-child {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Education */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.edu-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.25s var(--ease), background 0.35s;
}

.edu-card:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}

.edu-degree {
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.5rem;
}

.edu-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.edu-card > p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.edu-meta {
  margin-top: 0.75rem;
  font-size: 0.82rem !important;
  opacity: 0.85;
}

/* Contact */
.contact-panel {
  padding: 2rem;
  background: linear-gradient(135deg, var(--bg-card), var(--accent-dim));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.contact-panel > p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
}

.contact-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s var(--ease), background 0.35s;
}

.contact-link:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.contact-link-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  direction: ltr;
}

.contact-link-value {
  font-weight: 600;
  direction: ltr;
  text-align: right;
  color: var(--accent);
  font-size: 0.9rem;
  word-break: break-all;
}

/* Footer */
.site-footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem clamp(1.25rem, 4vw, 2.5rem) 3rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-note {
  margin-top: 0.25rem;
  font-size: 0.8rem !important;
  opacity: 0.7;
}

/* Binary 0/1 digits around cursor */
.cursor-binary {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 40;
  opacity: 0;
  transition: opacity 0.45s var(--ease);
  will-change: transform, opacity;
}

body.cursor-active .cursor-binary {
  opacity: 1;
}

.cursor-bit {
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.85);
  transition:
    opacity 0.4s var(--ease),
    transform 0.4s var(--ease),
    color 0.2s;
  text-shadow: 0 0 10px var(--accent-glow);
  user-select: none;
}

body.cursor-active .cursor-bit {
  opacity: var(--bit-opacity, 0.85);
  transform: translate(-50%, -50%) scale(1);
}

.cursor-bit.is-flip {
  color: var(--text-muted);
}

/* Scroll reveal — sections */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.75s var(--ease),
    transform 0.75s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Scroll reveal — staggered children */
.reveal-item {
  opacity: 0;
  transform: translateY(28px) scale(0.98);
  transition:
    opacity 0.65s var(--ease),
    transform 0.65s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal-item.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.reveal .section-header.reveal-item.visible {
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 220px 1fr;
  }

  .hero-card {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .stat {
    border-bottom: none;
    padding-bottom: 0;
  }

  .stack-preview {
    grid-column: 1 / -1;
  }

  .about-layout {
    grid-template-columns: 1fr;
  }

  .gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-photo {
    max-width: 280px;
    margin: 0 auto;
  }

  .skills-grid,
  .edu-grid {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--header-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.35s var(--ease), opacity 0.35s;
    pointer-events: none;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 0.85rem 2rem;
    font-size: 1rem;
  }

  .nav a::after {
    display: none;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (max-width: 640px) {
  .hero-card {
    grid-template-columns: 1fr 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }

  .gallery {
    grid-template-columns: 1fr;
  }
}

@media (hover: none), (pointer: coarse) {
  .cursor-binary {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .cursor-binary {
    display: none;
  }

  .reveal,
  .reveal-item {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .pulse-dot {
    animation: none;
  }

  body,
  .bg-mesh,
  .site-header,
  .hero-card,
  .skill-card,
  .edu-card,
  .contact-link {
    transition: none;
  }
}