/* =========================================================
   Dario Brkic — Portfolio
   Design: Swiss Fintech / Developer
   Palette: Midnight Navy base · Teal→Indigo aurora · glass surfaces
   Type: Space Grotesk (display) · Inter (body) · JetBrains Mono (data)
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  /* base */
  --bg:           #070a14;
  --bg-2:         #0a0e1c;
  --surface:      rgba(255, 255, 255, 0.045);
  --surface-2:    rgba(255, 255, 255, 0.07);
  --border:       rgba(255, 255, 255, 0.10);
  --border-soft:  rgba(255, 255, 255, 0.06);

  /* text */
  --text:         #e8ecf6;
  --text-soft:    #aab2c8;
  --text-dim:     #6b7490;

  /* accents */
  --teal:         #3ddbd0;
  --indigo:       #7c83ff;
  --violet:       #a778ff;
  --accent:       var(--teal);
  --grad:         linear-gradient(120deg, var(--teal), var(--indigo) 55%, var(--violet));

  /* glow */
  --glow-teal:    rgba(61, 219, 208, 0.45);
  --glow-indigo:  rgba(124, 131, 255, 0.40);

  /* type */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body:    "Inter", system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, monospace;

  /* layout */
  --container:    1200px;
  --radius:       18px;
  --radius-sm:    12px;
  --ease:         cubic-bezier(0.22, 1, 0.36, 1);
  --header-h:     72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: clamp(15px, 1vw + 0.6rem, 17px);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font: inherit; }

::selection { background: var(--teal); color: #04121a; }

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 48px);
}

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

.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05) inset, 0 24px 60px -28px rgba(0,0,0,0.7);
}

.skip-link {
  position: fixed;
  top: -100px; left: 16px; z-index: 200;
  background: var(--teal); color: #04121a;
  padding: 10px 18px; border-radius: 10px; font-weight: 600;
  transition: top 0.25s var(--ease);
}
.skip-link:focus { top: 16px; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- Ambient background ---------- */
.bg {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(1200px 800px at 80% -10%, rgba(124,131,255,0.10), transparent 60%),
    radial-gradient(1000px 700px at -10% 110%, rgba(61,219,208,0.10), transparent 55%),
    var(--bg);
  overflow: hidden;
}
.bg__aurora {
  position: absolute; inset: -30%;
  background:
    radial-gradient(40% 40% at 30% 30%, rgba(61,219,208,0.28), transparent 60%),
    radial-gradient(45% 45% at 70% 40%, rgba(124,131,255,0.26), transparent 62%),
    radial-gradient(40% 40% at 50% 75%, rgba(167,120,255,0.20), transparent 60%);
  filter: blur(40px);
  animation: aurora 24s ease-in-out infinite alternate;
  will-change: transform;
}
.bg__mesh {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
}
.bg__grid {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  opacity: 0.6;
}

@keyframes aurora {
  0%   { transform: translate3d(-4%, -2%, 0) rotate(0deg) scale(1.05); }
  50%  { transform: translate3d(3%, 4%, 0) rotate(8deg) scale(1.15); }
  100% { transform: translate3d(-2%, 2%, 0) rotate(-6deg) scale(1.08); }
}

/* ---------- Custom cursor ---------- */
.cursor {
  position: fixed; top: 0; left: 0; z-index: 150;
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--teal);
  transform: translate(-50%, -50%);
  pointer-events: none;
  transition: width 0.25s var(--ease), height 0.25s var(--ease),
              background 0.25s var(--ease), border-color 0.25s var(--ease);
  mix-blend-mode: difference;
}
.cursor.is-hover {
  width: 52px; height: 52px;
  background: rgba(61,219,208,0.18);
  border-color: transparent;
}
.cursor.is-down { width: 18px; height: 18px; }

/* ---------- Preloader ---------- */
.preloader {
  position: fixed; inset: 0; z-index: 300;
  display: grid; place-content: center; gap: 22px; justify-items: center;
  background: var(--bg);
  transition: opacity 0.6s var(--ease), visibility 0.6s var(--ease);
}
.preloader.is-done { opacity: 0; visibility: hidden; }
.preloader__brand {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  letter-spacing: 0.04em;
  display: flex; gap: 0.2em;
}
.preloader__bracket { color: var(--teal); }
.preloader__name { color: var(--text); font-weight: 600; }
.preloader__logo { width: 48px; height: 48px; object-fit: contain; display: block; }
.preloader__bar {
  width: min(240px, 60vw); height: 3px; border-radius: 3px;
  background: rgba(255,255,255,0.1); overflow: hidden;
}
.preloader__bar span {
  display: block; height: 100%; width: 0;
  background: var(--grad);
  animation: load 1.4s var(--ease) forwards;
}
@keyframes load { to { width: 100%; } }

/* ---------- Header ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease),
              backdrop-filter 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}
.header.is-scrolled {
  background: rgba(7,10,20,0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--border-soft);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; }

.brand { display: inline-flex; align-items: center; gap: 12px; font-family: var(--font-display); }
.brand__mark {
  display: grid; place-content: center;
  width: 38px; height: 38px; border-radius: 11px;
  font-weight: 700; font-size: 0.95rem; letter-spacing: 0.02em;
  color: #04121a;
  background: var(--grad);
  box-shadow: 0 0 24px -6px var(--glow-teal);
}
.brand__logo { width: 38px; height: 38px; border-radius: 11px; object-fit: contain; display: block; }
.brand__text { font-weight: 600; letter-spacing: -0.01em; font-size: 1.05rem; }
.brand__dot { color: var(--teal); }

.nav__list { display: flex; align-items: center; gap: 6px; }
.nav__link {
  position: relative;
  padding: 9px 14px; border-radius: 10px;
  color: var(--text-soft); font-weight: 500; font-size: 0.94rem;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.nav__link::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px;
  height: 2px; border-radius: 2px; background: var(--grad);
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s var(--ease);
}
.nav__link:hover { color: var(--text); }
.nav__link.is-active { color: var(--text); }
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link--cta {
  color: #04121a; background: var(--grad); font-weight: 600;
  box-shadow: 0 0 24px -8px var(--glow-teal);
}
.nav__link--cta::after { display: none; }
.nav__link--cta:hover { color: #04121a; filter: brightness(1.08); }

/* Burger */
.burger {
  display: none; width: 44px; height: 44px; border-radius: 12px;
  position: relative; border: 1px solid var(--border);
}
.burger span {
  position: absolute; left: 11px; right: 11px; height: 2px; border-radius: 2px;
  background: var(--text); transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}
.burger span:nth-child(1) { top: 15px; }
.burger span:nth-child(2) { top: 21px; }
.burger span:nth-child(3) { top: 27px; }
.burger.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 24px; border-radius: 12px;
  font-weight: 600; font-size: 0.95rem; letter-spacing: 0.01em;
  transition: transform 0.25s var(--ease), box-shadow 0.3s var(--ease), filter 0.25s var(--ease);
  will-change: transform;
}
.btn--primary {
  color: #04121a; background: var(--grad);
  box-shadow: 0 10px 30px -12px var(--glow-teal);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -12px var(--glow-teal); filter: brightness(1.05); }
.btn--ghost {
  color: var(--text); background: var(--surface);
  border: 1px solid var(--border);
}
.btn--ghost:hover { transform: translateY(-2px); border-color: var(--teal); box-shadow: 0 12px 30px -16px var(--glow-teal); }
.btn--block { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex; align-items: center;
  padding-top: var(--header-h);
}
.hero__inner { padding-block: clamp(40px, 8vh, 90px); max-width: 880px; }
.hero__eyebrow {
  font-family: var(--font-mono); font-size: 0.9rem; color: var(--text-soft);
  margin-bottom: 22px; letter-spacing: 0.02em;
}
.hero__prompt { color: var(--teal); }
.hero__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.8rem, 9vw, 6rem);
  line-height: 0.98; letter-spacing: -0.03em;
  margin-bottom: 18px;
  background: linear-gradient(180deg, #fff, #c4ccdf);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__role {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.3rem, 3.6vw, 2.2rem);
  line-height: 1.15; letter-spacing: -0.01em;
  color: var(--text); margin-bottom: 26px;
}
.hero__lead {
  max-width: 56ch; color: var(--text-soft);
  font-size: clamp(1rem, 1.4vw, 1.15rem); margin-bottom: 36px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 48px; }

.hero__stats { display: flex; flex-wrap: wrap; gap: clamp(24px, 6vw, 56px); }
.hero__stats li { display: flex; flex-direction: column; }
.hero__stats strong {
  font-family: var(--font-display); font-size: 1.7rem; font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__stats span { font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; }

.hero__scroll {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim);
  letter-spacing: 0.18em; text-transform: uppercase;
}
.hero__scroll-line {
  width: 1px; height: 42px;
  background: linear-gradient(var(--teal), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse { 0%,100% { opacity: 0.3; transform: scaleY(0.6); } 50% { opacity: 1; transform: scaleY(1); } }

/* ---------- Sections ---------- */
.section { padding-block: clamp(80px, 13vh, 150px); position: relative; }
.section__head { max-width: 640px; margin-bottom: clamp(40px, 6vh, 64px); }
.section__eyebrow {
  display: inline-block;
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.1em;
  color: var(--teal); margin-bottom: 14px;
}
.section__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.05; letter-spacing: -0.02em;
}
.section__sub { color: var(--text-soft); margin-top: 14px; font-size: 1.05rem; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(28px, 4vw, 56px); align-items: start; }
.about__col p { color: var(--text-soft); margin-bottom: 18px; }
.about__col strong { color: var(--text); font-weight: 600; }
.about__lead {
  font-family: var(--font-display); font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  line-height: 1.4; color: var(--text) !important; margin-bottom: 26px !important;
}
.about__card { padding: 30px; }
.about__card-title {
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 22px;
}
.about__facts { display: grid; gap: 18px; }
.about__facts > div { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--border-soft); }
.about__facts > div:last-child { border-bottom: none; padding-bottom: 0; }
.about__facts dt { color: var(--text-dim); font-size: 0.85rem; }
.about__facts dd { font-weight: 600; text-align: right; }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 2.5vw, 26px); }
.skills__group { padding: 30px; }
.skills__cat {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 600;
  margin-bottom: 26px;
}
.skills__cat-icon {
  font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--teal); padding: 6px 10px; border-radius: 9px;
  background: rgba(61,219,208,0.1); border: 1px solid rgba(61,219,208,0.2);
}
.bars { display: grid; gap: 18px; }
.bar { display: grid; gap: 8px; }
.bar__label { font-size: 0.92rem; font-weight: 500; color: var(--text-soft); }
.bar__track { height: 7px; border-radius: 6px; background: rgba(255,255,255,0.07); overflow: hidden; }
.bar__fill {
  display: block; height: 100%; width: 0; border-radius: 6px;
  background: var(--grad);
  box-shadow: 0 0 14px -2px var(--glow-teal);
  transition: width 1.2s var(--ease);
}

/* ---------- Certifications ---------- */
.certs { display: grid; gap: 20px; }
.cert { display: flex; gap: 24px; align-items: flex-start; padding: 30px; max-width: 720px; }
.cert__badge {
  flex-shrink: 0; display: grid; place-content: center;
  width: 58px; height: 58px; border-radius: 14px;
  color: var(--teal); background: rgba(61,219,208,0.1);
  border: 1px solid rgba(61,219,208,0.22);
}
.cert__title { font-family: var(--font-display); font-size: 1.3rem; margin-bottom: 10px; }
.cert__desc { color: var(--text-soft); margin-bottom: 18px; }
.cert__link {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--teal); font-weight: 600; font-size: 0.95rem;
  transition: gap 0.25s var(--ease), color 0.25s var(--ease);
}
.cert__link:hover { gap: 12px; color: var(--violet); }

/* ---------- Projects ---------- */
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(18px, 2.5vw, 26px); }
.project {
  position: relative; padding: 32px; overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.project__index {
  font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--text-dim); display: block; margin-bottom: 18px;
}
.project__glow {
  position: absolute; top: -40%; right: -30%;
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, var(--glow-indigo), transparent 70%);
  opacity: 0; transition: opacity 0.5s var(--ease); pointer-events: none;
}
.project:hover { border-color: var(--border); }
.project:hover .project__glow { opacity: 1; }
.project__title { font-family: var(--font-display); font-size: 1.4rem; margin-bottom: 14px; }
.project__desc { color: var(--text-soft); font-size: 0.96rem; margin-bottom: 22px; }
.project__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.project__tags li {
  font-family: var(--font-mono); font-size: 0.76rem;
  padding: 5px 11px; border-radius: 8px;
  color: var(--text-soft);
  background: rgba(255,255,255,0.05); border: 1px solid var(--border-soft);
}

/* ---------- Contact ---------- */
.contact { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(28px, 4vw, 56px); align-items: start; }
.contact__intro p { color: var(--text-soft); margin-bottom: 26px; font-size: 1.05rem; }
.contact__channels { display: grid; gap: 14px; }
.contact__channels a {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 18px; border-radius: 12px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text-soft); font-weight: 500;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.contact__channels a:hover { color: var(--text); border-color: var(--teal); transform: translateX(4px); }
.contact__channels svg { color: var(--teal); }

/* Form */
.form { padding: clamp(24px, 4vw, 38px); display: grid; gap: 20px; }
.field { display: grid; gap: 8px; }
.field label { font-size: 0.88rem; font-weight: 600; color: var(--text-soft); }
.field input, .field textarea {
  width: 100%; padding: 14px 16px; border-radius: 12px;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  color: var(--text); transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: var(--text-dim); }
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(61,219,208,0.14);
  background: rgba(255,255,255,0.06);
}
.field.is-invalid input, .field.is-invalid textarea { border-color: #ff6b7a; }
.field__error { font-size: 0.8rem; color: #ff8a96; min-height: 1em; }
.form__status { font-size: 0.92rem; color: var(--teal); min-height: 1.2em; text-align: center; }
.form__status.is-error { color: #ff8a96; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border-soft); padding-block: 40px; }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; }
.footer__copy { color: var(--text-dim); font-size: 0.9rem; }
.footer__nav { display: flex; gap: 22px; }
.footer__nav a { color: var(--text-soft); font-size: 0.92rem; transition: color 0.25s var(--ease); }
.footer__nav a:hover { color: var(--teal); }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .skills, .projects { grid-template-columns: 1fr 1fr; }
  .about, .contact { grid-template-columns: 1fr; }
  .about__card { order: -1; }
}

@media (max-width: 760px) {
  .burger { display: block; }
  .nav {
    position: fixed; inset: 0 0 0 auto; width: min(320px, 84vw);
    background: rgba(8,11,22,0.92);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--border);
    transform: translateX(100%); transition: transform 0.4s var(--ease);
    display: flex; align-items: center; padding: 90px 28px 40px; z-index: 90;
  }
  .nav.is-open { transform: translateX(0); }
  .nav__list { flex-direction: column; align-items: stretch; gap: 6px; width: 100%; }
  .nav__link { padding: 14px 16px; font-size: 1.05rem; }
  .nav__link::after { left: 16px; right: auto; width: 18px; }
  .nav__link--cta { text-align: center; margin-top: 12px; }
  .skills, .projects { grid-template-columns: 1fr; }
  .cert { flex-direction: column; gap: 18px; }
  .footer__inner { flex-direction: column; text-align: center; }
}

@media (max-width: 420px) {
  .hero__stats { gap: 22px; }
  .btn { width: 100%; }
}

/* Ultrawide */
@media (min-width: 1800px) {
  :root { --container: 1360px; }
  body { font-size: 18px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .bg__aurora { animation: none; }
  .cursor { display: none; }
}

/* Hide custom cursor on touch / coarse pointers */
@media (hover: none), (pointer: coarse) {
  .cursor { display: none; }
}