/* =========================================================================
   Petar Acimovic — personal site
   Design system: navy + warm paper + burnt-orange accent, serif/mono/sans
   type stack. Engineering-notebook feel: hairline rules, blueprint grid,
   drafting corner marks, mono index numerals.
   ========================================================================= */

:root {
  /* palette */
  --navy: #16253d;
  --navy-deep: #0e1929;
  --ink: #1c2531;
  --paper: #faf8f3;
  --paper-dim: #f1eee5;
  --line: rgba(22, 37, 61, 0.14);
  --line-strong: rgba(22, 37, 61, 0.26);
  --accent: #ec6437;
  --accent-dark: #b8451f;
  --muted: #6b7280;
  --white: #ffffff;

  /* type */
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --container: 1600px;
  --pad: clamp(20px, 4vw, 72px);
  --radius: 3px;
  --transition: 220ms cubic-bezier(.4, 0, .2, 1);
  --shadow-sm: 0 1px 2px rgba(14, 25, 41, .06), 0 1px 1px rgba(14, 25, 41, .04);
  --shadow-md: 0 12px 32px -12px rgba(14, 25, 41, .28);
}

/* ---------------------------------------------------------------- reset */
* , *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; padding: 0; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; margin: 0; color: var(--navy); }
p { margin: 0; }
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad);
}

::selection { background: var(--accent); color: var(--white); }

/* -------------------------------------------------------------- typo bits */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin: 0 0 .9rem;
}
.eyebrow::before {
  content: '';
  width: 1.6rem;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}
.eyebrow-light { color: var(--accent); }

/* ================================================================ HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  background: rgba(22, 37, 61, .94);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 100px;
}
.brand { display: flex; align-items: center; gap: .85rem; flex-shrink: 0; }
.brand-mark {
  display: flex;
  width: 52px; height: 52px;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 0 2px var(--white);
}
.brand-mark img { width: 100%; height: 100%; object-fit: cover; }
.brand-name {
  font-family: var(--font-sans);
  font-size: 1.32rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: .005em;
  white-space: nowrap;
}

.nav-desktop { display: flex; align-items: center; gap: 2.3rem; }
.nav-link {
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 500;
  color: rgba(255, 255, 255, .68);
  position: relative;
  padding: .3rem 0;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--white);
  transition: right var(--transition);
}
.nav-link:hover { color: var(--white); }
.nav-link:hover::after, .nav-link.is-active::after { right: 0; }
.nav-link.is-active { color: var(--white); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 1rem; }

.nav-toggle {
  display: none;
  width: 34px; height: 34px;
  position: relative;
  flex-shrink: 0;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  left: 6px; right: 6px;
  height: 2px;
  background: var(--white);
  transition: transform var(--transition), opacity var(--transition), top var(--transition);
}
.nav-toggle span { top: 16px; }
.nav-toggle span::before { top: -8px; }
.nav-toggle span::after { top: 8px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  border-top: 1px solid rgba(255, 255, 255, .1);
  background: var(--navy);
}
.nav-mobile.is-open { display: flex; }
.nav-mobile a {
  padding: .95rem 1.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--white);
}
.nav-mobile .btn { margin: 1rem 1.75rem 1.4rem; align-self: flex-start; }

@media (max-width: 860px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: block; }
  .header-actions .btn { display: none; }
}

/* ================================================================ BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-sans);
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .01em;
  padding: .75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.btn-primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); transform: translateY(-1px); box-shadow: var(--shadow-sm); }

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--line-strong);
}
.btn-outline:hover { border-color: var(--navy); background: var(--navy); color: var(--white); }

.btn-outline-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.34);
}
.btn-outline-light:hover { border-color: var(--white); background: var(--white); color: var(--navy); }

.btn-chip {
  background: var(--white);
  color: var(--navy);
  border-color: var(--line-strong);
  font-size: .8rem;
  padding: .5rem 1.05rem;
  border-radius: 999px;
}
.btn-chip:hover { border-color: var(--accent-dark); color: var(--white); background: var(--accent-dark); }

.btn-sm { padding: .55rem 1.15rem; font-size: .8rem; }

/* ================================================================== HERO */
.hero {
  position: relative;
  overflow: hidden;
  padding: 6.5rem 0 5.5rem;
  border-bottom: 1px solid var(--line);
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 30% 20%, #000 40%, transparent 88%);
          mask-image: radial-gradient(ellipse 70% 80% at 30% 20%, #000 40%, transparent 88%);
  opacity: .8;
}
.hero-inner { position: relative; z-index: 1; max-width: 760px; }
.hero-title {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 600;
  letter-spacing: -.01em;
  margin-bottom: 1.15rem;
}
.hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent-dark);
}
.hero-subtitle {
  font-size: 1.14rem;
  line-height: 1.65;
  color: var(--muted);
  max-width: 46ch;
  margin-bottom: 2.4rem;
}
.hero-subtitle strong { color: var(--navy); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; }

/* ============================================================= SECTIONS */
.section-head { max-width: 640px; margin: 0 0 3.2rem; }
.section-head h2 { font-size: clamp(1.9rem, 3.4vw, 2.5rem); margin-bottom: .85rem; }
.section-head p { color: var(--muted); font-size: 1.02rem; max-width: 54ch; }

.projects { padding: 6rem 0 2rem; }

/* ============================================================= PROJECTS */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.project {
  display: grid;
  grid-template-columns: 440px 1fr;
  gap: 3.2rem;
  align-items: center;
  background: var(--paper);
  padding: 3rem 0;
}
.project.is-reverse { grid-template-columns: 1fr 440px; }
.project.is-reverse .project-visual { order: 2; }
.project.is-reverse .project-body { order: 1; }
.project.project--text-only { grid-template-columns: 1fr; }

.project-visual { position: relative; }
.project-figure {
  position: relative;
  display: block;
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: zoom-in;
  background: var(--paper-dim);
  border: 1px solid var(--line);
}
.project-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform .5s cubic-bezier(.4,0,.2,1);
}
.project-figure:hover img { transform: scale(1.045); }

.project-figure .corner {
  position: absolute;
  width: 16px; height: 16px;
  border-color: var(--accent);
  opacity: 0;
  transition: opacity var(--transition), width var(--transition), height var(--transition);
  pointer-events: none;
}
.project-figure .corner.tl { top: 8px; left: 8px; border-top: 2px solid; border-left: 2px solid; }
.project-figure .corner.tr { top: 8px; right: 8px; border-top: 2px solid; border-right: 2px solid; }
.project-figure .corner.bl { bottom: 8px; left: 8px; border-bottom: 2px solid; border-left: 2px solid; }
.project-figure .corner.br { bottom: 8px; right: 8px; border-bottom: 2px solid; border-right: 2px solid; }
.project-figure:hover .corner { opacity: 1; width: 20px; height: 20px; }

.view-badge {
  position: absolute;
  right: 12px; bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: rgba(22, 37, 61, .82);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .4rem .7rem;
  border-radius: 999px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition), transform var(--transition);
}
.project-figure:hover .view-badge { opacity: 1; transform: translateY(0); }

.project-body { min-width: 0; }
.project-index {
  display: block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--accent-dark);
  margin-bottom: .6rem;
}
.project-body h3 { font-size: 1.55rem; margin-bottom: .85rem; }
.project-body p { color: var(--ink); opacity: .82; margin-bottom: .7rem; max-width: 60ch; }
.project-body p:last-of-type { margin-bottom: 0; }
.project-links { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.4rem; }

.project-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; }
.project-columns p { max-width: none; margin-bottom: 0; }
@media (max-width: 700px) { .project-columns { grid-template-columns: 1fr; gap: .5rem; } }

@media (max-width: 860px) {
  .project, .project.is-reverse {
    grid-template-columns: 1fr;
    gap: 1.6rem;
    padding: 2.4rem 0;
  }
  .project.is-reverse .project-visual,
  .project.is-reverse .project-body { order: initial; }
  .project-visual { max-width: 420px; }
}

/* =============================================================== CONTACT */
.contact {
  background: var(--navy);
  background-image: radial-gradient(ellipse 60% 100% at 100% 0%, rgba(236,100,55,.14), transparent 60%);
  color: var(--white);
  padding: 5.5rem 0;
}
.contact-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.contact-intro h2 { color: var(--white); font-size: clamp(1.9rem, 3.2vw, 2.4rem); margin: .6rem 0 1rem; }
.contact-intro p { color: rgba(255,255,255,.68); max-width: 42ch; font-size: 1.02rem; }

.contact-links { display: flex; flex-direction: column; gap: 1.05rem; }
.contact-link {
  display: flex;
  align-items: center;
  gap: .9rem;
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--white);
  padding: 1rem 1.2rem;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.contact-link:hover { border-color: var(--accent); background: rgba(236,100,55,.08); transform: translateX(4px); }
.contact-link .icon-badge {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  flex-shrink: 0;
}
.contact-link svg { width: 17px; height: 17px; }
.contact-link .link-label { color: rgba(255,255,255,.55); font-size: .78rem; display: block; font-family: var(--font-mono); letter-spacing: .04em; }
.contact-link .link-value { display: block; margin-top: .1rem; }

@media (max-width: 760px) {
  .contact-inner { grid-template-columns: 1fr; gap: 2.4rem; }
}

/* ================================================================ FOOTER */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,.58);
  padding: 1.7rem 0;
  font-size: 1rem;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .6rem;
}
.footer-inner a { color: rgba(255,255,255,.7); }
.footer-inner a:hover { color: var(--accent); }

/* ======================================================== GALLERY PAGE */
.gallery-hero {
  padding: 4.5rem 0 3rem;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.gallery-hero .hero-grid-bg { opacity: .6; }
.gallery-hero-inner { position: relative; z-index: 1; max-width: 640px; }
.gallery-hero h1 { font-size: clamp(2.3rem, 5vw, 3.2rem); margin-bottom: 1rem; }
.gallery-hero p { color: var(--muted); font-size: 1.05rem; max-width: 50ch; }

.gallery-section { padding: 3.5rem 0 6rem; }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
}
.gallery-item {
  position: relative;
  display: block;
  cursor: zoom-in;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-dim);
  border: 1px solid var(--line);
}
.gallery-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform .5s cubic-bezier(.4,0,.2,1);
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item .corner { position: absolute; width: 14px; height: 14px; border-color: var(--white); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
.gallery-item .corner.tl { top: 7px; left: 7px; border-top: 2px solid; border-left: 2px solid; }
.gallery-item .corner.tr { top: 7px; right: 7px; border-top: 2px solid; border-right: 2px solid; }
.gallery-item .corner.bl { bottom: 7px; left: 7px; border-bottom: 2px solid; border-left: 2px solid; }
.gallery-item .corner.br { bottom: 7px; right: 7px; border-bottom: 2px solid; border-right: 2px solid; }
.gallery-item:hover .corner { opacity: .85; }
.gallery-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 1.6rem .85rem .7rem;
  background: linear-gradient(to top, rgba(14,25,41,.82), transparent);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: .82rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--transition), transform var(--transition);
}
.gallery-item:hover .gallery-caption { opacity: 1; transform: translateY(0); }

@media (max-width: 980px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: .7rem; } }

/* =============================================================== LIGHTBOX */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 900;
  background: #0c1420;
  display: flex;
  flex-direction: column;
}
.lightbox[hidden] { display: none; }
.lightbox-topbar {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: .85rem;
  padding: .85rem 1.4rem;
  flex-shrink: 0;
}
.lightbox-counter {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: rgba(255,255,255,.6);
  letter-spacing: .04em;
}
.lightbox-info { text-align: center; color: var(--white); min-width: 0; }
.lightbox-info[hidden] { display: none; }
.lightbox-info h3 { color: var(--white); font-size: 1rem; font-family: var(--font-display); font-weight: 500; }
.lightbox-info p { color: rgba(255,255,255,.55); font-size: .78rem; margin-top: .15rem; font-family: var(--font-mono); }
.lightbox-close {
  color: var(--white);
  opacity: .75;
  font-size: 1.3rem;
  line-height: 1;
  padding: .3rem;
  transition: opacity var(--transition), color var(--transition), transform var(--transition);
}
.lightbox-close:hover { opacity: 1; color: var(--accent); transform: rotate(90deg); }

.lightbox-body { flex: 1; min-height: 0; display: flex; align-items: center; justify-content: center; position: relative; padding: 0 1.4rem 1.5rem; }
.lightbox-inner { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.lightbox-img { max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; border: 1px solid rgba(255,255,255,.08); }

.lightbox-prev, .lightbox-next {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem; height: 2.2rem;
  color: var(--white);
  transition: color var(--transition), transform var(--transition);
}
.lightbox-prev:hover, .lightbox-next:hover { color: var(--accent); transform: scale(1.12); }
.lightbox-prev svg, .lightbox-next svg { width: 15px; height: 15px; }

@media (max-width: 640px) {
  .lightbox-topbar { padding: .7rem 1rem; gap: .5rem; }
  .lightbox-info h3 { font-size: .88rem; }
  .lightbox-info p { display: none; }
}

/* ============================================================= UTILITIES */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}