/* ---------------------------------------------------------
   Portfolio stylesheet
   Minimal, text-led, generous white space, muted purple accent
--------------------------------------------------------- */

/* Cross-document View Transitions: lets a project card's image morph
   into the case-study hero image on click, matched via the shared
   view-transition-name set inline on each pair. Chromium-only today;
   unsupported browsers just navigate normally, no fallback needed. */
@view-transition {
  navigation: auto;
}

::view-transition-group(*) {
  animation-duration: 0.45s;
  animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

:root {
  --color-accent: #8f8ec2;
  --color-accent-dark: #6f6ea3;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f6fa;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-border: #e6e4ec;

  --max-width: 1100px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 7rem;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

#top,
#about,
#work,
#contact {
  scroll-margin-top: 72px;
}

body {
  margin: 0;
  font-family: 'Montserrat', sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
}

a {
  color: inherit;
}

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

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 100px);
}

.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;
}

/* Focus visibility for keyboard users */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------------- Header / Nav ---------------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
  max-width: none;
  padding-left: clamp(32px, 4vw, 48px);
  padding-right: clamp(32px, 4vw, 48px);
}

.logo {
  font-weight: 600;
  text-decoration: none;
  font-size: 1.05rem;
}

.primary-nav {
  display: flex;
  gap: var(--space-md);
}

.primary-nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background 0.15s ease;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bar::before {
  top: -6px;
}

.nav-toggle-bar::after {
  top: 6px;
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
  }

  .primary-nav.is-open {
    display: flex;
  }

  .primary-nav a {
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--color-border);
  }

  .header-inner {
    position: relative;
  }
}

/* ---------------- Hero ---------------- */

.hero{position:sticky; top:0; z-index:1; min-height:100dvh; overflow:hidden; display:grid; place-items:center; padding:120px 24px 60px}
.hero.is-covered{visibility:hidden; pointer-events:none}
.hero-bg{position:fixed; inset:0; overflow:hidden; pointer-events:none; z-index:-1}
.blob{position:absolute; width:60vmax; height:60vmax; border-radius:50%; filter:blur(60px); opacity:.22; will-change:transform}
.b1{background:radial-gradient(closest-side,#e9f2ff,#ffffff 70%); top:-10%; left:-10%}
.b2{background:radial-gradient(closest-side,#f2f2f2,#ffffff 70%); bottom:-20%; right:-10%}
.splash{position:absolute; opacity:.18; filter:blur(1px); will-change:transform}
.s1{ width:520px; top:4%;  left:2%;  transform:rotate(-10deg); animation:wander1 79s ease-in-out infinite alternate }
.s2{ width:620px; bottom:2%; right:6%; transform:rotate(12deg);  animation:wander2 88s ease-in-out infinite alternate }
.s3{ width:420px; top:10%; right:10%; opacity:.14; transform:rotate(-4deg); animation:wander3 84s ease-in-out infinite alternate }
.s4{ width:460px; bottom:10%; left:8%; opacity:.16; transform:rotate(6deg);  animation:wander4 77s ease-in-out infinite alternate }
.s5{ width:500px; top:30%; left:55%; opacity:.17; transform:rotate(-6deg); animation:wander5 82s ease-in-out infinite alternate }
@keyframes wander1{0%{transform:translate(-35vw,-28vh) rotate(-10deg)}50%{transform:translate(-5vw,20vh) rotate(-8deg)}100%{transform:translate(32vw,-18vh) rotate(-10deg)}}
@keyframes wander2{0%{transform:translate(28vw,26vh) rotate(12deg)}50%{transform:translate(-8vw,-24vh) rotate(14deg)}100%{transform:translate(-42vw,12vh) rotate(12deg)}}
@keyframes wander3{0%{transform:translate(34vw,-22vh) rotate(-4deg)}50%{transform:translate(12vw,18vh) rotate(-3deg)}100%{transform:translate(-30vw,-16vh) rotate(-4deg)}}
@keyframes wander4{0%{transform:translate(-26vw,18vh) rotate(6deg)}50%{transform:translate(22vw,-12vh) rotate(7deg)}100%{transform:translate(40vw,24vh) rotate(6deg)}}
@keyframes wander5{0%{transform:translate(18vw,-26vh) rotate(-6deg)}50%{transform:translate(-22vw,8vh) rotate(-5deg)}100%{transform:translate(-38vw,-20vh) rotate(-6deg)}}
.splash .splash-m{will-change:transform; transition:transform .2s ease-out}
.hero-inner{position:relative; text-align:center; max-width:1100px; z-index:3}
.hero-notice{display:inline-block; margin:0 0 20px; padding:6px 14px; border-radius:999px; background:rgba(255,255,255,.6); border:1px solid #e2ddc9; color:#5a5240; font-size:13px; font-weight:500; animation:fadeUp .6s ease .1s backwards}
.hero-title{margin:0 0 10px; font-size:clamp(44px,7.2vw,92px); font-weight:600; letter-spacing:-0.02em; animation:dropIn .6s cubic-bezier(.34,1.56,.64,1) .2s backwards}
@keyframes dropIn{from{opacity:0; transform:translateY(-16px)} to{opacity:1; transform:translateY(0)}}
.hero-subline{margin:6px 0 18px; color:#333; opacity:.85; font-size:clamp(12px,1.6vw,14px); font-weight:500; letter-spacing:.14em; text-transform:uppercase; animation:fadeUp .6s ease .4s backwards}
@keyframes fadeUp{from{opacity:0; transform:translateY(12px)} to{opacity:1; transform:translateY(0)}}
.hero-subline .sep{opacity:.35; padding:0 10px}
.hero-actions{display:flex; align-items:center; justify-content:center; gap:14px; flex-wrap:wrap; animation:fadeUp .6s ease .6s backwards}
.cta{display:inline-block; padding:9px 13px; border-radius:999px; background:transparent; color:#111; text-decoration:none; font-weight:600; border:1px solid #dadada; font-size:15px}
.cta:hover{background:#111; color:#fff}
.scroll-indicator{position:absolute; left:50%; bottom:56px; transform:translateX(-50%); display:flex; flex-direction:column; align-items:center; gap:6px; text-decoration:none; color:#333; z-index:3; animation:bob 1.8s ease-in-out infinite}
.scroll-label{font-size:11px; font-weight:500; letter-spacing:.14em; text-transform:uppercase; opacity:.6; margin-bottom:-2px}
.scroll-chevron{width:18px; height:18px; opacity:.6}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}
@media (prefers-reduced-motion:reduce){ .splash .splash-m{transition:none!important} .scroll-indicator{animation:none!important} .tab-panel{animation:none!important} }

/* ---------------- Section headings ---------------- */

.section-heading {
  font-size: 1.6rem;
  margin: 0 0 var(--space-md);
  color: var(--color-accent);
}

.work,
.about-section,
.contact-section {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.work {
  border-top: 1px solid var(--color-border);
}

.about-section {
  position: relative;
  z-index: 2;
  background: var(--color-bg);
  border-radius: 24px 24px 0 0;
  box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.08);
}

.contact-section {
  position: relative;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

/* ---------------- About ---------------- */

.about-columns {
  display: grid;
  grid-template-columns: minmax(220px, 320px) 1fr;
  gap: var(--space-xl);
  align-items: start;
  margin-bottom: var(--space-lg);
}

.about-photo img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top;
  border-radius: 12px;
}

.section-title-lg {
  font-size: clamp(40px, 5.5vw, 56px);
}

.about-content .section-heading {
  margin-bottom: var(--space-sm);
}

.about-bio {
  color: var(--color-text-muted);
  margin: 0 0 1.5em;
}

.about-bio:first-of-type {
  margin-top: var(--space-lg);
}

.about-bio:last-of-type {
  margin-bottom: 0;
}

.about-grid-heading {
  font-size: 1rem;
  color: var(--color-accent);
  margin: 0 0 var(--space-sm);
}

.about-grid-col p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin: 0;
}

.tab-list {
  display: flex;
  gap: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.tab-btn {
  font-family: inherit;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 0 0 var(--space-sm);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-btn.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-panel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.tab-panel {
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 700px) {
  .about-columns {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .about-photo {
    max-width: 260px;
    margin: 0 auto;
  }

  .tab-list {
    gap: var(--space-md);
  }

  .contact-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
}

.contact-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: 0 0 2px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.contact-item:hover,
.contact-item:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.contact-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---------------- Project grid ---------------- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg) var(--space-md);
  max-width: 1800px;
  margin: 0 auto;
}

.project-card {
  text-decoration: none;
  color: var(--color-text);
  display: block;
}

.project-image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-alt);
  border-radius: 4px;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: filter 0.3s ease;
}

.project-card:hover .project-image img,
.project-card:focus-visible .project-image img {
  filter: grayscale(0);
}

.project-image--swap {
  position: relative;
}

.project-image--swap img {
  position: absolute;
  inset: 0;
  filter: none;
  transition: opacity 1s ease;
}

.project-image--swap .project-image-hover {
  opacity: 0;
}

.project-card:hover .project-image--swap .project-image-hover,
.project-card:focus-visible .project-image--swap .project-image-hover {
  opacity: 1;
}

.project-card:hover .project-image--swap .project-image-base,
.project-card:focus-visible .project-image--swap .project-image-base {
  opacity: 0;
}

.project-info-box {
  background: var(--color-bg);
  padding: 14px 16px 16px;
}

.project-title {
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: left;
  margin: 0;
  transition: color 0.3s ease;
}

.project-card:hover .project-title,
.project-card:focus-visible .project-title {
  color: var(--color-accent);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  margin: 6px 0 0;
}

.project-tags li {
  font-size: 13px;
  color: var(--color-text-muted);
}

.project-tags li:not(:last-child)::after {
  content: " \00B7 ";
}

@media (max-width: 1000px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .project-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------- Footer ---------------- */

.site-footer {
  position: relative;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ---------------- Case study / project pages ---------------- */

.case-study {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-xl);
  max-width: 700px;
}

.back-link {
  display: inline-block;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
  transition: color 0.15s ease;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--color-accent);
}

.case-study-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  margin: 0 0 var(--space-xs);
}

.case-study-header .project-subtitle {
  font-size: 1.05rem;
  margin-bottom: var(--space-sm);
}

.case-study-header .project-tags {
  margin-bottom: var(--space-md);
}

.case-study-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-alt);
  border-radius: 4px;
  margin-bottom: var(--space-lg);
}

.case-study-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: filter 0.3s ease;
}

.case-study-image img:hover,
.case-study-image img:focus-visible {
  filter: grayscale(0);
}

.case-study-section {
  margin-bottom: var(--space-lg);
}

.case-study-section h2 {
  font-size: 1.2rem;
  color: var(--color-accent);
  margin: 0 0 var(--space-sm);
}

.case-study-section p {
  color: var(--color-text-muted);
  margin: 0 0 var(--space-sm);
}

.tools-list li {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-text);
  background: var(--color-bg-alt);
  border-radius: 100px;
  padding: 0.25rem 0.75rem;
  margin: 0 0.4rem 0.4rem 0;
}