/* ==========================================================================
   Fahmid Siyam — Portfolio Stylesheet
   Design system: dark "developer terminal" aesthetic
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Colors — dark theme (default) */
  --bg: #0b0f1a;
  --bg-alt: #0e1420;
  --surface: #121826;
  --surface-2: #161d2e;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.28);

  --text: #e7ecf5;
  --text-muted: #93a0b8;
  --text-faint: #5c6a85;

  --accent: #5eead4;        /* teal / cyan */
  --accent-2: #a78bfa;      /* violet */
  --accent-3: #f472b6;      /* pink, sparing use */
  --success: #4ade80;
  --warning: #fbbf24;
  --danger: #fb7185;

  --gradient: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);

  /* Typography */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Layout */
  --container-w: 1180px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --nav-h: 72px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 220ms var(--ease);

  color-scheme: dark;
}

/* Light theme overrides */
[data-theme="light"] {
  --bg: #f7f8fb;
  --bg-alt: #eef1f6;
  --surface: #ffffff;
  --surface-2: #f2f4f8;
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.18);

  --text: #101623;
  --text-muted: #4b5670;
  --text-faint: #8794ac;

  --accent: #0d9488;
  --accent-2: #7c3aed;
  --accent-3: #db2777;

  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; margin: 0; line-height: 1.15; }
p { margin: 0 0 1em; color: var(--text-muted); }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #06251f;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  z-index: 999;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

.text-gradient {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--gradient);
  color: #06251f;
  box-shadow: 0 8px 24px -8px rgba(94, 234, 212, 0.5);
}
.btn--primary:hover { box-shadow: 0 12px 28px -6px rgba(94, 234, 212, 0.55); }

.btn--ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn--icon {
  width: 48px;
  height: 48px;
  padding: 0;
  justify-content: center;
  border: 1px solid var(--border-strong);
  color: var(--text);
  border-radius: 50%;
  font-size: 1.1rem;
}
.btn--icon:hover { border-color: var(--accent); color: var(--accent); }

.btn--sm { padding: 9px 18px; font-size: 0.85rem; }
.btn--block { width: 100%; justify-content: center; }
.btn.disabled { opacity: 0.45; pointer-events: none; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.navbar__inner {
  max-width: var(--container-w);
  margin-inline: auto;
  height: 100%;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.navbar__brand {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.brand__bracket { color: var(--text-faint); }
.brand__accent { color: var(--accent); }

.navbar__list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-block;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }

.navbar__actions { display: flex; align-items: center; gap: 10px; }

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  display: grid;
  place-items: center;
  position: relative;
  transition: border-color var(--transition), background var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle i { position: absolute; transition: opacity var(--transition), transform var(--transition); }
.theme-toggle .fa-sun { opacity: 0; transform: rotate(-90deg) scale(0.6); }
.theme-toggle .fa-moon { opacity: 1; transform: rotate(0) scale(1); color: var(--accent-2); }
[data-theme="light"] .theme-toggle .fa-sun { opacity: 1; transform: rotate(0) scale(1); color: var(--warning); }
[data-theme="light"] .theme-toggle .fa-moon { opacity: 0; transform: rotate(90deg) scale(0.6); }

.hamburger {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.hamburger span {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}

.hero__bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero__grid {
  position: absolute;
  inset: -10% -10%;
  background-image:
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 60% 55% at 50% 40%, black 10%, transparent 75%);
  opacity: 0.6;
}
.hero__glow {
  position: absolute;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
}
.hero__glow--one { background: var(--accent); top: -10%; left: -8%; }
.hero__glow--two { background: var(--accent-2); bottom: -15%; right: -5%; }

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
  padding-block: 60px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(74, 222, 128, 0); }
  100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}

.hero__title {
  font-size: clamp(2.3rem, 5vw, 3.6rem);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.hero__subtitle {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  margin-bottom: 20px;
}
.hero__intro { max-width: 52ch; font-size: 1.02rem; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 30px 0 34px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-size: 0.85rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
}
.hero__stats i { color: var(--accent); margin-right: 6px; }

/* Terminal token colors — reused by the photo badge snippet below */
.terminal__dot { width: 11px; height: 11px; border-radius: 50%; }
.terminal__dot--red { background: #fb7185; }
.terminal__dot--yellow { background: #fbbf24; }
.terminal__dot--green { background: #4ade80; }
.tok-kw { color: var(--accent-2); }
.tok-var { color: #93c5fd; }
.tok-key { color: #7dd3fc; }
.tok-str { color: var(--success); }
.tok-bool { color: var(--warning); }
.tok-punc { color: var(--text-faint); }

/* Hero photo frame */
.hero__visual { display: flex; justify-content: center; }

.photo-frame {
  position: relative;
  width: min(360px, 78vw);
  aspect-ratio: 4 / 5;
  transform: perspective(1200px) rotateY(-4deg) rotateX(2deg);
  transition: transform 500ms var(--ease);
}
.photo-frame:hover { transform: perspective(1200px) rotateY(0deg) rotateX(0deg); }

.photo-frame__ring {
  position: absolute;
  inset: -10px;
  border-radius: calc(var(--radius-lg) + 10px);
  background: var(--gradient);
  opacity: 0.55;
  filter: blur(2px);
  z-index: 0;
}

.photo-frame__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 4px solid var(--bg);
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.55);
  display: block;
}

.photo-badge {
  position: absolute;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 9px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
  box-shadow: 0 14px 28px -14px rgba(0, 0, 0, 0.5);
}
.photo-badge i { color: var(--accent); }
.photo-badge--top {
  top: -18px;
  right: -14px;
}
.photo-badge--bottom {
  bottom: -18px;
  left: -14px;
}
.terminal-snippet .tok-punc { margin-inline: 2px; }

.scroll-cue {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid var(--border-strong);
  border-radius: 20px;
  z-index: 1;
}
.scroll-cue span {
  display: block;
  width: 4px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  margin: 7px auto 0;
  animation: scrollcue 1.6s infinite;
}
@keyframes scrollcue {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(12px); opacity: 0; }
  100% { opacity: 0; }
}

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section--alt { background: var(--bg-alt); }

.section__eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}
.section__title {
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.section__lead {
  max-width: 60ch;
  font-size: 1.05rem;
  margin-bottom: 46px;
}

/* Reveal animation base */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
  transition-delay: var(--delay, 0ms);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 54px;
  align-items: start;
}
.about__text p { font-size: 1.02rem; }

.about__cards { display: grid; gap: 18px; }
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.info-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.info-card i { color: var(--accent); font-size: 1.3rem; margin-bottom: 12px; }
.info-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.info-card p { margin: 0; font-size: 0.92rem; }

/* ---------- Skills ---------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.skill-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: 0 16px 30px -18px rgba(94, 234, 212, 0.4);
}
.skill-card__icon {
  width: 52px; height: 52px;
  margin: 0 auto 14px;
  border-radius: 14px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  font-size: 1.3rem;
}
.skill-card h3 { font-size: 0.95rem; margin-bottom: 12px; }
.skill-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}
.skill-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--gradient);
  border-radius: 999px;
  transition: width 1200ms var(--ease);
}
.skill-card.is-visible .skill-bar span { width: var(--level); }

/* ---------- Projects ---------- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: 0 24px 40px -24px rgba(0,0,0,0.5);
}
.project-card__top {
  height: 110px;
  display: grid;
  place-items: center;
  font-size: 2rem;
  color: var(--accent);
  background:
    radial-gradient(circle at 30% 20%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 55%),
    radial-gradient(circle at 80% 90%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 55%),
    var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.project-card__body { padding: 22px 24px 6px; flex: 1; }
.project-card__body h3 { font-size: 1.15rem; margin-bottom: 10px; }
.project-card__body p { font-size: 0.93rem; }
.project-card__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.project-card__tags li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 25%, transparent);
  padding: 4px 10px;
  border-radius: 999px;
}
.project-card__actions {
  display: flex;
  gap: 10px;
  padding: 20px 24px 24px;
}

/* ---------- GitHub ---------- */
.github__profile {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  margin-bottom: 34px;
  flex-wrap: wrap;
}
.github__profile i { font-size: 2.4rem; color: var(--text); }
.github__profile h3 { font-family: var(--font-mono); font-size: 1.1rem; margin-bottom: 4px; }
.github__profile p { margin: 0; font-size: 0.9rem; }
.github__profile .btn { margin-left: auto; }

.repo-status {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 20px 0;
}
.repo-status.is-error { color: var(--danger); }
.repo-status.is-hidden { display: none; }

.repo__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.repo-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform var(--transition), border-color var(--transition);
}
.repo-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.repo-card__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.repo-card__head h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  word-break: break-word;
}
.repo-card__head a { color: var(--text-faint); font-size: 1.1rem; }
.repo-card__head a:hover { color: var(--text); }
.repo-card p { font-size: 0.88rem; margin: 0; flex: 1; }
.repo-card__meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  flex-wrap: wrap;
}
.repo-card__meta span { display: inline-flex; align-items: center; gap: 6px; }
.repo-card__meta i.fa-star { color: var(--warning); }
.lang-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent-2); display: inline-block; }

/* ---------- Education ---------- */
.timeline { position: relative; padding-left: 40px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 19px; top: 0; bottom: 0;
  width: 2px;
  background: var(--border-strong);
}
.timeline__item { position: relative; }
.timeline__marker {
  position: absolute;
  left: -40px; top: 0;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  color: var(--accent);
}
.timeline__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
}
.timeline__card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.timeline__org { color: var(--accent); font-weight: 600; margin-bottom: 4px; }
.timeline__meta { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-faint); margin-bottom: 14px; }
.timeline__meta i { margin-right: 6px; }

/* ---------- Contact ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
}
.contact__info { display: flex; flex-direction: column; gap: 16px; }
.contact__item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: transform var(--transition), border-color var(--transition);
}
.contact__item:hover { transform: translateX(4px); border-color: var(--border-strong); }
.contact__item i { font-size: 1.3rem; color: var(--accent); width: 24px; text-align: center; }
.contact__item span { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.04em; }
.contact__item p { margin: 2px 0 0; color: var(--text); font-weight: 500; }

.contact__form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); }
.form-group input,
.form-group textarea {
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
  outline: none;
}
.form-group.has-error input,
.form-group.has-error textarea { border-color: var(--danger); }
.form-error {
  font-size: 0.78rem;
  color: var(--danger);
  min-height: 1em;
  font-family: var(--font-mono);
}
.form-success {
  margin: 0;
  font-size: 0.9rem;
  color: var(--success);
  font-weight: 600;
  text-align: center;
  min-height: 1.2em;
}

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 30px 0; }
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}
.footer p { margin: 0; font-size: 0.85rem; color: var(--text-faint); }
.footer__socials { display: flex; gap: 14px; }
.footer__socials a {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: grid; place-items: center;
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition);
}
.footer__socials a:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  display: grid;
  place-items: center;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), border-color var(--transition), color var(--transition);
  z-index: 90;
  box-shadow: 0 12px 24px -12px rgba(0,0,0,0.5);
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { border-color: var(--accent); color: var(--accent); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1080px) {
  .skills__grid { grid-template-columns: repeat(4, 1fr); }
  .repo__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 960px) {
  .navbar__nav {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 320ms var(--ease);
  }
  .navbar__nav.is-open { max-height: 420px; }
  .navbar__list { flex-direction: column; align-items: stretch; padding: 10px 24px 20px; gap: 4px; }
  .nav-link { padding: 12px 14px; }
  .hamburger { display: flex; }

  .hero__inner { grid-template-columns: 1fr; gap: 44px; padding-block: 40px; }
  .hero__visual { order: -1; }
  .photo-frame { transform: none; }

  .about__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .section { padding: 76px 0; }
  .skills__grid { grid-template-columns: repeat(3, 1fr); }
  .projects__grid { grid-template-columns: 1fr; }
  .repo__grid { grid-template-columns: 1fr; }
  .github__profile { flex-direction: column; align-items: flex-start; }
  .github__profile .btn { margin-left: 0; }
}

@media (max-width: 480px) {
  .container { padding-inline: 18px; }
  .skills__grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .hero__title { font-size: 2rem; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn--icon { align-self: flex-start; }
  .photo-badge { font-size: 0.72rem; padding: 8px 12px; }
  .photo-badge--top { top: -14px; right: -8px; }
  .photo-badge--bottom { bottom: -14px; left: -8px; }
  .timeline { padding-left: 30px; }
  .timeline__marker { left: -30px; width: 32px; height: 32px; font-size: 0.85rem; }
}