/* =====================================================
   Matheus Brasil · Portfolio
   Inspired by Amberite — minimal, typographic, elegant
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&family=Instrument+Serif:ital@0;1&display=swap');

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
img  { display: block; max-width: 100%; height: auto; }
a    { color: inherit; text-decoration: none; }
ul   { list-style: none; }
button { border: none; background: none; cursor: pointer; font: inherit; }

/* ── Tokens ── */
:root {
  --bg:        #f5f2ed;
  --bg-card:   #edeae4;
  --fg:        #1a1a18;
  --fg-muted:  #6b6860;
  --fg-faint:  #b0ada8;
  --border:    #dedad4;
  --accent:    #1a1a18;          /* near-black; accent is contrast */
  --accent-hover: #3d3a35;

  --font-body:    'Inter', system-ui, sans-serif;
  --font-display: 'Instrument Serif', Georgia, serif;

  --max-w: 900px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 0.25s;
}

/* ── Base ── */
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout helpers ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}
.section { padding: 6rem 0; }

/* ── Divider ── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* =====================================================
   NAVIGATION
   ===================================================== */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(245, 242, 237, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
#nav.scrolled { border-color: var(--border); }

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--fg);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--fg-muted);
  padding: 0.4rem 0.85rem;
  border-radius: 100px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-links a:hover {
  color: var(--fg);
  background: var(--bg-card);
}

/* mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 20px; height: 1.5px;
  background: var(--fg);
  transition: var(--dur) var(--ease);
}

/* =====================================================
   HERO
   ===================================================== */
#hero {
  padding-top: calc(var(--nav-h) + 5rem);
  padding-bottom: 5rem;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3rem;
}

.hero-text { display: flex; flex-direction: column; gap: 1.5rem; }

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.hero-eyebrow::before {
  content: '';
  display: block;
  width: 24px; height: 1px;
  background: var(--fg-muted);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.hero-title em {
  font-style: italic;
  color: var(--fg-muted);
}

.hero-body {
  max-width: 480px;
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--fg);
  color: var(--bg);
  padding: 0.65rem 1.4rem;
  border-radius: 100px;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-ghost {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease);
}
.btn-ghost:hover { color: var(--fg); }

/* Hero photo */
.hero-photo {
  flex-shrink: 0;
}
.hero-photo img {
  width: clamp(220px, 30vw, 320px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 4px solid var(--bg-card);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

/* =====================================================
   ABOUT STRIP
   ===================================================== */
#about-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 4rem 0;
}

.about-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 1.25rem;
}

.about-text {
  font-size: 1.05rem;
  color: var(--fg);
  line-height: 1.8;
}
.about-text + .about-text { margin-top: 1rem; color: var(--fg-muted); font-size: 0.95rem; }

.about-meta { display: flex; flex-direction: column; gap: 1.25rem; }

.meta-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}
.meta-row:last-child { border-bottom: none; padding-bottom: 0; }

.meta-key {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
.meta-val {
  font-size: 0.95rem;
  color: var(--fg);
}
.meta-val a { color: var(--fg); text-decoration: underline; text-underline-offset: 3px; }
.meta-val a:hover { color: var(--fg-muted); }

/* =====================================================
   PROJECTS
   ===================================================== */
#projects { padding: 5rem 0; }

.projects-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 2.5rem;
  gap: 1rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.projects-list {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Each project row */
.project-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  border-top: 1px solid var(--border);
}
.project-row:last-child { border-bottom: 1px solid var(--border); }

.project-info {
  padding: 2rem 0 2rem 0;
  padding-right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-num {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--fg-faint);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.65;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}
.tag {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--fg);
  margin-top: auto;
  padding-top: 0.5rem;
  transition: gap var(--dur) var(--ease);
}
.project-link svg {
  width: 14px; height: 14px;
  transition: transform var(--dur) var(--ease);
}
.project-link:hover { gap: 0.7rem; }
.project-link:hover svg { transform: translate(2px, -2px); }

.project-image-col {
  padding: 2rem 0 2rem 2rem;
  border-left: 1px solid var(--border);
  display: flex;
  align-items: center;
}
.project-image-col img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 8px;
  filter: grayscale(20%);
  transition: filter var(--dur) var(--ease);
}
.project-row:hover .project-image-col img { filter: grayscale(0%); }

/* =====================================================
   SKILLS
   ===================================================== */
#skills {
  border-top: 1px solid var(--border);
  padding: 5rem 0;
}

.skills-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 4rem;
  align-items: start;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.skill-group-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 0.75rem;
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.skill-item {
  font-size: 0.95rem;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.skill-item::before {
  content: '';
  display: block;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--fg-faint);
  flex-shrink: 0;
}

/* =====================================================
   CONTACT
   ===================================================== */
#contact {
  border-top: 1px solid var(--border);
  padding: 5rem 0;
}

.contact-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.contact-title em { font-style: italic; color: var(--fg-muted); }

.contact-sub {
  margin-top: 1.25rem;
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.contact-link-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--fg);
  font-size: 0.95rem;
  transition: color var(--dur) var(--ease);
  gap: 0.5rem;
}
.contact-link-row:first-child { border-top: 1px solid var(--border); }
.contact-link-row:hover { color: var(--fg-muted); }

.contact-link-name { font-weight: 500; }
.contact-link-handle { color: var(--fg-muted); font-size: 0.875rem; }

.contact-link-arrow {
  color: var(--fg-faint);
  font-size: 1rem;
  transition: transform var(--dur) var(--ease);
}
.contact-link-row:hover .contact-link-arrow { transform: translate(3px, -3px); }

/* =====================================================
   FOOTER
   ===================================================== */
#footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--fg-faint);
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.footer-socials a {
  font-size: 0.8rem;
  color: var(--fg-faint);
  transition: color var(--dur) var(--ease);
}
.footer-socials a:hover { color: var(--fg); }

/* =====================================================
   REVEAL ANIMATION
   ===================================================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* =====================================================
   PROJECT PAGES (inner)
   ===================================================== */
.page-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(245, 242, 237, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.page-nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: var(--fg-muted);
  transition: color var(--dur) var(--ease), gap var(--dur) var(--ease);
}
.back-link:hover { color: var(--fg); gap: 0.6rem; }
.back-link svg { width: 14px; height: 14px; }

.page-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--fg);
}

/* Article layout */
.article-wrap {
  padding-top: calc(var(--nav-h) + 4rem);
  padding-bottom: 6rem;
}

.article-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  margin-bottom: 3.5rem;
}

.article-context {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.article-context::before {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--fg-muted);
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}
.article-tag {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
}

/* Article body */
.article-body {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 3rem 0 1rem;
  line-height: 1.2;
}
.article-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
  margin: 2rem 0 0.75rem;
}

.article-body p {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.article-body ul {
  list-style: none;
  margin: 0.75rem 0 1.25rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.article-body ul li {
  font-size: 0.95rem;
  color: var(--fg-muted);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  line-height: 1.65;
}
.article-body ul li::before {
  content: '–';
  color: var(--fg-faint);
  flex-shrink: 0;
  margin-top: 0.05em;
}

.article-body .callout {
  background: var(--bg-card);
  border-left: 3px solid var(--border);
  padding: 1rem 1.25rem;
  border-radius: 0 6px 6px 0;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--fg-muted);
  line-height: 1.7;
}

.article-body a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
  transition: text-decoration-color var(--dur) var(--ease);
}
.article-body a:hover { text-decoration-color: var(--fg); }

/* Images in article */
.article-img {
  margin: 2rem 0;
}
.article-img img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.article-img figcaption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  color: var(--fg-faint);
  text-align: center;
}

/* External link button */
.ext-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--fg);
  color: var(--bg);
  padding: 0.65rem 1.25rem;
  border-radius: 100px;
  margin: 0.5rem 0 1.5rem;
  transition: background var(--dur) var(--ease);
}
.ext-link-btn:hover { background: var(--accent-hover); }
.ext-link-btn svg { width: 14px; height: 14px; }

/* Article footer nav */
.article-nav-footer {
  max-width: var(--max-w);
  margin: 4rem auto 0;
  padding: 2rem 2rem 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.article-nav-footer a {
  font-size: 0.875rem;
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: color var(--dur) var(--ease);
}
.article-nav-footer a:hover { color: var(--fg); }

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 1024px) {
  .hero-photo img {
    width: clamp(180px, 25vw, 250px);
  }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: rgba(245, 242, 237, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    gap: 0.25rem;
  }
  .nav-links.open a { font-size: 1rem; padding: 0.75rem 0; border-radius: 0; }
  .nav-toggle { display: flex; }

  /* Hero: mobile view */
  .hero-inner { grid-template-columns: 1fr; gap: 2.5rem; text-align: left; }
  .hero-photo { order: -1; }
  .hero-photo img { width: 140px; margin: 0; }

  .about-grid  { grid-template-columns: 1fr; gap: 2.5rem; }
  .skills-inner { grid-template-columns: 1fr; gap: 2rem; }
  .contact-inner { grid-template-columns: 1fr; gap: 2.5rem; }

  .project-row { grid-template-columns: 1fr; }
  .project-image-col { border-left: none; border-top: 1px solid var(--border); padding: 1.5rem 0 2rem; }
  .project-info { padding-right: 0; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2.2rem; }
  .section { padding: 4rem 0; }
  #about-strip { padding: 3rem 0; }
}