/* ================================================================
   PORTFOLIO.CSS — Nikola Markovic Portfolio
   Architecture: Design tokens → Base → Layout → Components → Sections → Responsive
   UI UX Pro Max: Portfolio / Motion-Driven / Archivo + Space Grotesk / Dark theme
================================================================ */

/* ── 1. DESIGN TOKENS ─────────────────────────────────────────── */
:root {
  /* Colors */
  --c-bg:          #0d0f14;
  --c-bg-2:        #131620;
  --c-bg-card:     #1a1d27;
  --c-border:      rgba(255,255,255,0.07);
  --c-border-hover:rgba(255,255,255,0.16);
  --c-text:        #e2e4ef;
  --c-text-muted:  #7c8399;
  --c-text-faint:  #4a5068;
  --c-accent:      #4f9cf9;
  --c-accent-dim:  rgba(79,156,249,0.12);
  --c-accent-glow: rgba(79,156,249,0.25);
  --c-cta:         #4f9cf9;
  --c-cta-hover:   #2f7de0;
  --c-white:       #ffffff;
  --c-tag-bg:      rgba(79,156,249,0.1);
  --c-tag-text:    #a8c8f8;
  --c-badge-dot:   #22c55e;

  /* Typography */
  --f-heading: 'Archivo', system-ui, sans-serif;
  --f-body:    'Space Grotesk', system-ui, sans-serif;

  /* Type scale */
  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.125rem;
  --fs-xl:   1.25rem;
  --fs-2xl:  1.5rem;
  --fs-3xl:  1.875rem;
  --fs-4xl:  2.25rem;
  --fs-5xl:  3rem;
  --fs-6xl:  3.75rem;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10:2.5rem;
  --sp-12:3rem;
  --sp-16:4rem;
  --sp-20:5rem;
  --sp-24:6rem;

  /* Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 9999px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-base: 250ms ease;
  --t-slow: 400ms ease;

  /* Layout */
  --max-w: 1200px;
  --nav-h: 68px;
}

/* ── 2. RESET & BASE ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--f-body);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
svg { flex-shrink: 0; }

/* ── 3. ACCESSIBILITY ─────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--sp-4);
  background: var(--c-accent);
  color: var(--c-white);
  padding: var(--sp-2) var(--sp-5);
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: var(--fs-sm);
  z-index: 9999;
  transition: top var(--t-fast);
}
.skip-link:focus { top: var(--sp-4); }

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

/* ── 4. LAYOUT UTILITIES ──────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

.section {
  padding-block: var(--sp-24);
}
.section + .section { border-top: 1px solid var(--c-border); }

.section__header {
  margin-bottom: var(--sp-12);
}
.section__label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-3);
}
.section__title {
  font-family: var(--f-heading);
  font-size: clamp(var(--fs-3xl), 4vw, var(--fs-5xl));
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.section__sub {
  margin-top: var(--sp-4);
  color: var(--c-text-muted);
  font-size: var(--fs-lg);
  max-width: 52ch;
}

/* ── 5. BUTTONS ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.65rem 1.5rem;
  font-family: var(--f-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--r-full);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--t-base), color var(--t-base), border-color var(--t-base),
              box-shadow var(--t-base), transform var(--t-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}
.btn--primary:hover {
  background: var(--c-cta-hover);
  border-color: var(--c-cta-hover);
  box-shadow: 0 4px 18px var(--c-accent-glow);
}

.btn--ghost {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border-hover);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.3);
  color: var(--c-white);
}

.btn--accent {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
  padding: 0.8rem 2rem;
  font-size: var(--fs-base);
}
.btn--accent:hover {
  background: var(--c-cta-hover);
  box-shadow: 0 6px 24px var(--c-accent-glow);
}

.btn--sm { padding: 0.5rem 1.1rem; font-size: var(--fs-xs); }

/* ── 6. SCROLL REVEAL ─────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

.reveal--delay-1 { transition-delay: 80ms; }
.reveal--delay-2 { transition-delay: 160ms; }
.reveal--delay-3 { transition-delay: 240ms; }
.reveal--delay-4 { transition-delay: 320ms; }
.reveal--delay-5 { transition-delay: 400ms; }
.reveal--delay-6 { transition-delay: 480ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ── 7. NAVIGATION ────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(13, 15, 20, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-border);
  transition: background var(--t-base), box-shadow var(--t-base);
}
.site-header.scrolled {
  background: rgba(13, 15, 20, 0.95);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--f-heading);
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--c-white);
  letter-spacing: -0.02em;
}
.nav__logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--c-accent);
  color: var(--c-white);
  border-radius: var(--r-sm);
  font-size: var(--fs-base);
  font-weight: 800;
  margin-right: var(--sp-2);
}
.nav__logo-text { color: var(--c-text); }
.nav__logo:hover .nav__logo-text { color: var(--c-white); }

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}
.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--c-text-muted);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  transition: color var(--t-base), background var(--t-base);
  letter-spacing: 0.01em;
}
.nav__link:hover,
.nav__link.active { color: var(--c-white); background: rgba(255,255,255,0.06); }
.nav__link.active { color: var(--c-accent); }

.nav__link--cta {
  background: var(--c-accent-dim);
  color: var(--c-accent);
  border: 1px solid rgba(79,156,249,0.25);
  margin-left: var(--sp-3);
  padding: var(--sp-2) var(--sp-5);
}
.nav__link--cta:hover {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 4px;
}
.nav__burger span {
  display: block;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-base), width var(--t-base);
}
.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__start,
.nav__end {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.music-player {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.music-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-full);
  color: var(--c-text-muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--c-border);
  transition: color var(--t-base), background var(--t-base),
              border-color var(--t-base), transform var(--t-fast);
  flex-shrink: 0;
}
.music-btn:hover {
  color: var(--c-accent);
  background: var(--c-accent-dim);
  border-color: rgba(79,156,249,0.35);
  transform: scale(1.08);
}
.music-btn.is-playing {
  color: var(--c-accent);
  background: var(--c-accent-dim);
  border-color: rgba(79,156,249,0.35);
  animation: music-pulse 2s ease-in-out infinite;
}
@keyframes music-pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--c-accent-glow); }
  50%       { box-shadow: 0 0 0 6px transparent; }
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-full);
  color: var(--c-text-muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--c-border);
  transition: color var(--t-base), background var(--t-base), border-color var(--t-base), transform var(--t-fast);
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--c-white);
  background: rgba(255,255,255,0.1);
  border-color: var(--c-border-hover);
  transform: rotate(20deg);
}

/* ── 8. HERO ──────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
  background: var(--c-bg);
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 75% 65% at 20% 0%,   rgba(79,156,249,0.16) 0%, transparent 60%),
    radial-gradient(ellipse 55% 45% at 88% 105%, rgba(79,156,249,0.08) 0%, transparent 55%),
    repeating-linear-gradient(0deg,   transparent, transparent 59px, rgba(79,156,249,0.025) 60px),
    repeating-linear-gradient(90deg,  transparent, transparent 59px, rgba(79,156,249,0.025) 60px);
  animation: hero-glow-breathe 10s ease-in-out infinite;
}
@keyframes hero-glow-breathe {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.55; }
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  will-change: transform, opacity;
}
.hero__orb--1 {
  width: 700px; height: 600px;
  top: -18%; left: -10%;
  background: radial-gradient(circle, rgba(79,156,249,0.22) 0%, transparent 70%);
  animation: hero-orb-1 14s ease-in-out infinite;
}
.hero__orb--2 {
  width: 450px; height: 450px;
  bottom: -15%; right: 0%;
  background: radial-gradient(circle, rgba(99,102,241,0.14) 0%, transparent 70%);
  animation: hero-orb-2 19s ease-in-out infinite;
}
.hero__orb--3 {
  width: 300px; height: 300px;
  top: 30%; right: 18%;
  background: radial-gradient(circle, rgba(79,156,249,0.09) 0%, transparent 70%);
  filter: blur(60px);
  animation: hero-orb-2 25s ease-in-out infinite reverse;
}

#heroCanvas {
  position: absolute;
  inset: 0; width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  mask-image: linear-gradient(to right, transparent 0%, rgba(0,0,0,0.4) 22%, black 50%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, rgba(0,0,0,0.4) 22%, black 50%);
}

@keyframes hero-orb-1 {
  0%, 100% { transform: translate(0,0) scale(1);      opacity: 1; }
  33%       { transform: translate(60px,45px) scale(1.08); opacity: 0.8; }
  66%       { transform: translate(-28px,70px) scale(0.94); opacity: 0.9; }
}
@keyframes hero-orb-2 {
  0%, 100% { transform: translate(0,0) scale(1);       opacity: 1; }
  50%       { transform: translate(-60px,-45px) scale(1.14); opacity: 0.6; }
}

/* inner layout — two columns on wide screens */
.hero__inner {
  position: relative;
  z-index: 1;
  padding-block: var(--sp-24);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: center;
  width: 100%;
}

.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

/* eyebrow status pill */
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: rgba(79,156,249,0.08);
  border: 1px solid rgba(79,156,249,0.22);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-full);
  width: fit-content;
}
.hero__eyebrow-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.75); }
}

/* name with glitch on hover */
.hero__name {
  font-family: var(--f-heading);
  font-size: clamp(var(--fs-4xl), 6vw, 5.5rem);
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -0.04em;
  line-height: 1.05;
  position: relative;
}
.hero__name--glitch:hover {
  animation: glitch 0.4s linear;
}
@keyframes glitch {
  0%   { clip-path: inset(0 0 100% 0); transform: translate(0); }
  10%  { clip-path: inset(10% 0 60% 0); transform: translate(-3px, 1px); color: var(--c-accent); }
  20%  { clip-path: inset(50% 0 30% 0); transform: translate(3px, -1px); }
  30%  { clip-path: inset(70% 0 10% 0); transform: translate(-2px, 2px); color: #a78bfa; }
  40%  { clip-path: inset(20% 0 70% 0); transform: translate(2px, -2px); }
  50%  { transform: translate(0); color: var(--c-white); }
  100% { transform: translate(0); clip-path: none; }
}

/* role line */
.hero__role {
  font-family: var(--f-heading);
  font-size: clamp(var(--fs-xl), 2.5vw, var(--fs-3xl));
  font-weight: 500;
  color: var(--c-accent);
  letter-spacing: -0.01em;
  margin-top: calc(var(--sp-5) * -1);
}

.hero__tagline {
  font-size: clamp(var(--fs-lg), 2vw, var(--fs-2xl));
  color: var(--c-text);
  font-weight: 400;
  line-height: 1.55;
  max-width: 52ch;
}
.hero__br { display: none; }
@media (min-width: 640px) { .hero__br { display: inline; } }

.hero__sub {
  font-size: var(--fs-base);
  color: var(--c-text-muted);
  max-width: 58ch;
  line-height: 1.75;
}

/* glow CTA */
.btn--glow {
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 18px rgba(79,156,249,0.35), 0 0 40px rgba(79,156,249,0.12);
}
.btn--glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 40%, rgba(255,255,255,0.18) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.55s ease;
}
.btn--glow:hover::after { transform: translateX(100%); }
.btn--glow:hover {
  box-shadow: 0 0 28px rgba(79,156,249,0.55), 0 0 60px rgba(79,156,249,0.18);
}

/* ghost sci-fi button */
.btn--ghost-sci {
  border-color: rgba(79,156,249,0.35);
  color: var(--c-accent);
  position: relative;
  overflow: hidden;
}
.btn--ghost-sci::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 40%, rgba(79,156,249,0.08) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.55s ease;
}
.btn--ghost-sci:hover::before { transform: translateX(100%); }
.btn--ghost-sci:hover {
  background: rgba(79,156,249,0.08);
  border-color: var(--c-accent);
  box-shadow: 0 0 18px rgba(79,156,249,0.2);
}

.hero__actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-top: var(--sp-2);
}

.hero__trust {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: var(--sp-4);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--c-border);
}

/* floating code panel */
.hero__panel {
  background: rgba(26, 29, 39, 0.65);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(79,156,249,0.18);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.45), inset 0 1px 0 rgba(255,255,255,0.06);
  animation: panel-float 6s ease-in-out infinite;
  position: relative;
}
.hero__panel::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(79,156,249,0.06) 0%, transparent 50%);
  pointer-events: none;
}
@keyframes panel-float {
  0%, 100% { transform: translateY(0px) rotate(0.3deg); }
  50%       { transform: translateY(-10px) rotate(-0.3deg); }
}

.hero__panel-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(79,156,249,0.1);
}
.hero__panel-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.hero__panel-dot--r { background: #ff5f57; }
.hero__panel-dot--y { background: #febc2e; }
.hero__panel-dot--g { background: #28c840; }
.hero__panel-title {
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  letter-spacing: 0.06em;
  margin-left: var(--sp-2);
  font-family: 'Courier New', monospace;
}

.hero__panel-code {
  padding: var(--sp-5) var(--sp-5) var(--sp-4);
  font-family: 'Courier New', Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--c-text-muted);
  white-space: pre;
  overflow-x: auto;
  tab-size: 2;
}
.tok-k  { color: #c792ea; } /* keyword */
.tok-n  { color: #82aaff; } /* identifier */
.tok-s  { color: #c3e88d; } /* string */
.tok-m  { color: #f78c6c; } /* number */
.tok-p  { color: #89ddff; } /* punctuation */
.tok-c  { color: #546e7a; font-style: italic; } /* comment */
.tok-kc { color: #ff9cac; } /* keyword-constant */

.hero__panel-status {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border-top: 1px solid rgba(79,156,249,0.1);
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  letter-spacing: 0.06em;
  font-family: 'Courier New', monospace;
}
.hero__panel-led {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
  animation: pulse-dot 2.4s ease-in-out infinite;
}

.hero__scroll {
  position: absolute;
  bottom: var(--sp-8);
  left: 50%;
  transform: translateX(-50%);
  color: var(--c-text-faint);
  animation: bounce 2s ease-in-out infinite;
  transition: color var(--t-base);
  z-index: 2;
}
.hero__scroll:hover { color: var(--c-accent); }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ── 9. ABOUT ─────────────────────────────────────────────────── */
.about { background: var(--c-bg-2); }

.about__grid {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: var(--sp-16);
  align-items: start;
}

.about__content { display: flex; flex-direction: column; gap: var(--sp-5); }

.about__lead {
  font-family: var(--f-heading);
  font-size: var(--fs-xl);
  font-weight: 500;
  color: var(--c-white);
  line-height: 1.6;
}
.about__body {
  color: var(--c-text-muted);
  line-height: 1.8;
}
.about__body strong { color: var(--c-text); font-weight: 600; }

.about__stats {
  display: flex;
  gap: var(--sp-8);
  padding: var(--sp-6) 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.stat { display: flex; flex-direction: column; gap: var(--sp-1); }
.stat__num {
  font-family: var(--f-heading);
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--c-accent);
  letter-spacing: -0.03em;
  line-height: 1;
}
.stat__label { font-size: var(--fs-xs); color: var(--c-text-muted); text-transform: uppercase; letter-spacing: 0.08em; }

.about__links { display: flex; gap: var(--sp-3); flex-wrap: wrap; }

/* ── 10. PROJECTS ─────────────────────────────────────────────── */
.projects__group-label {
  font-family: var(--f-heading);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--sp-6);
}

.projects__grid--featured {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--sp-6);
  margin-bottom: var(--sp-10);
}

.pcard {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
  display: flex;
  flex-direction: column;
}
.pcard:hover {
  border-color: var(--c-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4);
}

.pcard__img-wrap {
  overflow: hidden;
  aspect-ratio: 16/9;
}
.pcard__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}
.pcard:hover .pcard__img { transform: scale(1.04); }

.pcard__body {
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  flex: 1;
}
.pcard__body--compact { padding: var(--sp-5) var(--sp-6); }

.pcard__meta { display: flex; gap: var(--sp-2); flex-wrap: wrap; }
.pcard__tag {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-tag-text);
  background: var(--c-tag-bg);
  padding: 2px 10px;
  border-radius: var(--r-full);
  letter-spacing: 0.03em;
}

.pcard__title {
  font-family: var(--f-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.pcard__body--compact .pcard__title { font-size: var(--fs-lg); }

.pcard__desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: 1.7;
  flex: 1;
}

.pcard__stack {
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  font-family: var(--f-heading);
  letter-spacing: 0.01em;
  margin-top: auto;
}

.pcard__actions {
  display: flex;
  gap: var(--sp-3);
  align-items: center;
  margin-top: var(--sp-2);
}

.pcard__link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: color var(--t-base), opacity var(--t-base);
}
.pcard__link--live { color: var(--c-accent); }
.pcard__link--live:hover { color: var(--c-white); }
.pcard__link--gh { color: var(--c-text-muted); }
.pcard__link--gh:hover { color: var(--c-text); }

.projects__archive-toggle {
  display: flex;
  justify-content: center;
  padding-block: var(--sp-8);
}

.archive-icon {
  transition: transform var(--t-base);
}
#archiveToggle[aria-expanded="true"] .archive-icon {
  transform: rotate(180deg);
}

.projects__grid--archive {
  border-top: 1px solid var(--c-border);
  padding-top: var(--sp-8);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--sp-4);
}
.projects__grid--archive .projects__group-label {
  grid-column: 1 / -1;
  margin-bottom: var(--sp-3);
}

/* ── 11. EXPERIENCE / TIMELINE ────────────────────────────────── */
.experience { background: var(--c-bg-2); }

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-accent) 0%, var(--c-border) 100%);
}

.timeline__item {
  position: relative;
  padding-left: var(--sp-10);
  padding-bottom: var(--sp-10);
}
.timeline__item:last-child { padding-bottom: 0; }

.timeline__marker {
  position: absolute;
  left: 4px;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--c-bg-2);
  border: 2px solid var(--c-accent);
  border-radius: 50%;
  z-index: 1;
  transition: background var(--t-base), box-shadow var(--t-base);
}
.timeline__item:hover .timeline__marker {
  background: var(--c-accent);
  box-shadow: 0 0 0 4px var(--c-accent-dim);
}

.timeline__card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-8);
  transition: border-color var(--t-base);
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}
.timeline__item:hover .timeline__card { border-color: var(--c-border-hover); }

.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.timeline__title-group { display: flex; flex-direction: column; gap: var(--sp-1); }

.timeline__role {
  font-family: var(--f-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.02em;
}
.timeline__company {
  font-size: var(--fs-sm);
  color: var(--c-accent);
  font-weight: 500;
  transition: opacity var(--t-fast);
}
a.timeline__company:hover { opacity: 0.75; text-decoration: underline; text-underline-offset: 3px; }
.timeline__company--solo { color: var(--c-text-muted); }

.timeline__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--sp-1);
  flex-shrink: 0;
}
.timeline__period {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--c-text-muted);
  white-space: nowrap;
  font-family: var(--f-heading);
}
.timeline__location {
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
}

.timeline__summary {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: 1.75;
}

.timeline__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding-left: var(--sp-4);
}
.timeline__list li {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: 1.65;
  position: relative;
}
.timeline__list li::before {
  content: '–';
  position: absolute;
  left: calc(var(--sp-4) * -1);
  color: var(--c-accent);
  font-weight: 700;
}

/* Sub-project cards inside timeline */
.exp__project {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.exp__project-header { display: flex; align-items: center; gap: var(--sp-3); flex-wrap: wrap; }
.exp__project-badge {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-dim);
  padding: 2px 10px;
  border-radius: var(--r-full);
}
.exp__project-name {
  font-family: var(--f-heading);
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.01em;
}
.exp__project-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: 1.75;
}

.exp__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.exp__tags span {
  font-size: var(--fs-xs);
  color: var(--c-text-faint);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  padding: 3px 10px;
  border-radius: var(--r-full);
  font-family: var(--f-heading);
  letter-spacing: 0.01em;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.exp__tags span:hover { color: var(--c-text); border-color: var(--c-border-hover); }

/* ── 12. SKILLS ───────────────────────────────────────────────── */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-6);
}

.skill-group {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  transition: border-color var(--t-base), transform var(--t-base);
}
.skill-group:hover {
  border-color: var(--c-border-hover);
  transform: translateY(-2px);
}

.skill-group__title {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--f-heading);
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--c-white);
}
.skill-group__title svg { color: var(--c-accent); }

.skill-group__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.skill-group__tags span {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  padding: 4px 12px;
  border-radius: var(--r-full);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.skill-group__tags span:hover {
  color: var(--c-accent);
  border-color: rgba(79,156,249,0.3);
  background: var(--c-accent-dim);
}

/* ── 13. CONTACT ──────────────────────────────────────────────── */
.contact { background: var(--c-bg-2); }

.contact__inner {
  max-width: 680px;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-6);
}

.contact__title {
  font-family: var(--f-heading);
  font-size: clamp(var(--fs-3xl), 4vw, var(--fs-5xl));
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -0.04em;
  line-height: 1.1;
}
.contact__sub {
  font-size: var(--fs-lg);
  color: var(--c-text-muted);
  line-height: 1.7;
  max-width: 52ch;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  width: 100%;
  max-width: 420px;
}
.contact__item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--sp-4) var(--sp-5);
  transition: color var(--t-base), border-color var(--t-base), background var(--t-base);
}
.contact__item:hover {
  color: var(--c-white);
  border-color: var(--c-border-hover);
  background: rgba(255,255,255,0.04);
}
.contact__item svg { color: var(--c-accent); flex-shrink: 0; }

.contact__ctas {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--sp-4);
}

/* ── 14. FOOTER ───────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--c-border);
  padding-block: var(--sp-6);
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.footer__copy { font-size: var(--fs-xs); color: var(--c-text-faint); }
.footer__socials { display: flex; gap: var(--sp-4); }
.footer__socials a {
  color: var(--c-text-faint);
  transition: color var(--t-base);
}
.footer__socials a:hover { color: var(--c-accent); }

/* ── 15. BACK TO TOP ──────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  width: 44px;
  height: 44px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-muted);
  transition: color var(--t-base), border-color var(--t-base), box-shadow var(--t-base), transform var(--t-base);
  z-index: 50;
}
.back-to-top:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
  box-shadow: 0 0 16px var(--c-accent-glow);
  transform: translateY(-2px);
}
.back-to-top[hidden] { display: none; }

/* ── 16. RESPONSIVE ───────────────────────────────────────────── */
/* ── LIGHT THEME ─────────────────────────────────────────────── */
html[data-theme="light"] {
  --c-bg:          #f4f6fb;
  --c-bg-2:        #eceff8;
  --c-bg-card:     #ffffff;
  --c-border:      rgba(0,0,0,0.07);
  --c-border-hover:rgba(0,0,0,0.18);
  --c-text:        #3b4166;
  --c-text-muted:  #637097;
  --c-text-faint:  #9ca6c4;
  --c-accent:      #2563eb;
  --c-accent-dim:  rgba(37,99,235,0.1);
  --c-accent-glow: rgba(37,99,235,0.22);
  --c-cta:         #2563eb;
  --c-cta-hover:   #1d4ed8;
  --c-white:       #1a1d2e;
  --c-tag-bg:      rgba(37,99,235,0.08);
  --c-tag-text:    #1e4dcf;
}
html[data-theme="light"] .site-header {
  background: rgba(244,246,251,0.85);
  border-bottom-color: rgba(0,0,0,0.07);
}
html[data-theme="light"] .site-header.scrolled {
  background: rgba(244,246,251,0.97);
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}
html[data-theme="light"] .nav__menu {
  background: rgba(244,246,251,0.98);
  border-bottom-color: rgba(0,0,0,0.07);
}
html[data-theme="light"] .hero__bg-grid {
  background:
    radial-gradient(ellipse 80% 70% at 15% -5%, rgba(37,99,235,0.09) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 85% 110%, rgba(37,99,235,0.05) 0%, transparent 55%),
    repeating-linear-gradient(0deg,   transparent, transparent 59px, rgba(37,99,235,0.03) 60px),
    repeating-linear-gradient(90deg,  transparent, transparent 59px, rgba(37,99,235,0.03) 60px);
}
html[data-theme="light"] .hero__orb--1 {
  background: radial-gradient(circle, rgba(37,99,235,0.11) 0%, transparent 70%);
}
html[data-theme="light"] .hero__orb--2 {
  background: radial-gradient(circle, rgba(99,102,241,0.07) 0%, transparent 70%);
}
html[data-theme="light"] .hero__eyebrow {
  background: rgba(37,99,235,0.07);
  border-color: rgba(37,99,235,0.2);
}
html[data-theme="light"] .hero__panel {
  background: rgba(255,255,255,0.75);
  border-color: rgba(37,99,235,0.18);
  box-shadow: 0 8px 40px rgba(0,0,0,0.12), inset 0 1px 0 rgba(255,255,255,0.9);
}
html[data-theme="light"] .hero__panel-bar,
html[data-theme="light"] .hero__panel-status {
  background: rgba(0,0,0,0.03);
  border-color: rgba(37,99,235,0.1);
}
html[data-theme="light"] .hero__panel-code { color: #4a5280; }
html[data-theme="light"] .tok-k  { color: #7c3aed; }
html[data-theme="light"] .tok-n  { color: #1d4ed8; }
html[data-theme="light"] .tok-s  { color: #15803d; }
html[data-theme="light"] .tok-m  { color: #c2410c; }
html[data-theme="light"] .tok-p  { color: #0891b2; }
html[data-theme="light"] .tok-c  { color: #94a3b8; }
html[data-theme="light"] .tok-kc { color: #b91c1c; }
html[data-theme="light"] .hero__trust { border-top-color: rgba(0,0,0,0.08); }
html[data-theme="light"] .btn--primary,
html[data-theme="light"] .btn--accent { color: #ffffff; }
html[data-theme="light"] .theme-toggle,
html[data-theme="light"] .music-btn {
  background: rgba(0,0,0,0.05);
  border-color: rgba(0,0,0,0.12);
}
html[data-theme="light"] .theme-toggle:hover,
html[data-theme="light"] .music-btn:hover {
  background: rgba(37,99,235,0.08);
  border-color: rgba(37,99,235,0.3);
  color: var(--c-accent);
}
html[data-theme="light"] .music-btn.is-playing {
  background: rgba(37,99,235,0.1);
  border-color: rgba(37,99,235,0.35);
  color: var(--c-accent);
}
html[data-theme="light"] .exp__tags span {
  background: rgba(0,0,0,0.05);
  color: var(--c-text);
}
html[data-theme="light"] .section + .section {
  border-top-color: rgba(0,0,0,0.07);
}
html[data-theme="light"] .hero__trust {
  border-top-color: rgba(0,0,0,0.08);
}

@media (max-width: 1024px) {
  .about__grid { grid-template-columns: 180px 1fr; gap: var(--sp-10); }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__panel { display: none; }
}

@media (max-width: 768px) {
  :root { --nav-h: 60px; }

  .nav__menu {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(13,15,20,0.97);
    backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: stretch;
    padding: var(--sp-4) var(--sp-6) var(--sp-8);
    gap: var(--sp-1);
    border-bottom: 1px solid var(--c-border);
    transform: translateY(-110%);
    transition: transform var(--t-base), opacity var(--t-base);
    opacity: 0;
    pointer-events: none;
  }
  .nav__menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav__link { padding: var(--sp-3) var(--sp-4); border-radius: var(--r-sm); }
  .nav__link--cta { margin-left: 0; margin-top: var(--sp-2); text-align: center; justify-content: center; }
  .nav__burger { display: flex; }

  .about__grid { grid-template-columns: 1fr; }
  .about__photo-wrap {
    position: static;
    max-width: 340px;
    margin-inline: auto;
  }

  .timeline::before { left: 8px; }
  .timeline__item { padding-left: var(--sp-8); }
  .timeline__marker { left: 1px; width: 14px; height: 14px; }
  .timeline__header { flex-direction: column; gap: var(--sp-2); }
  .timeline__meta { align-items: flex-start; }
  .timeline__card { padding: var(--sp-5); gap: var(--sp-4); }

  .section { padding-block: var(--sp-16); }
  .hero__inner { padding-block: var(--sp-16); }
}

@media (max-width: 480px) {
  .container { padding-inline: var(--sp-4); }
  .projects__grid--featured { grid-template-columns: 1fr; }
  .projects__grid--archive { grid-template-columns: 1fr 1fr; }
  .hero__actions { flex-direction: column; align-items: flex-start; }
  .about__stats { flex-wrap: wrap; gap: var(--sp-5); }
  .contact__ctas { flex-direction: column; width: 100%; }
  .contact__ctas .btn { justify-content: center; }
}