/* ============================================
   ANTONIO BUSA — PORTFOLIO
   Editorial Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --bg-primary: #1a1a18;
  --bg-secondary: #222220;
  --bg-card: #2a2a27;
  --text-primary: #f0e8d8;
  --text-secondary: #b8b0a0;
  --text-muted: #7a7468;
  --accent: #c47a5a;
  --accent-hover: #d48a6a;
  --rule-color: #3a3834;
  --rule-accent: #c47a5a;

  /* Typography Scale */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.85rem);
  --text-sm: clamp(0.85rem, 0.8rem + 0.3vw, 0.95rem);
  --text-base: clamp(1rem, 0.95rem + 0.3vw, 1.1rem);
  --text-lg: clamp(1.15rem, 1rem + 0.5vw, 1.35rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --text-2xl: clamp(2rem, 1.5rem + 2vw, 3rem);
  --text-3xl: clamp(2.5rem, 1.8rem + 3vw, 4.5rem);
  --text-hero: clamp(3.5rem, 2rem + 6vw, 8rem);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;

  /* Layout */
  --max-width: 1200px;
  --gutter: clamp(1.5rem, 4vw, 4rem);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

/* Grain texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-hover);
}

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

/* --- Layout Utilities --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section {
  padding: var(--space-xl) 0;
  position: relative;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
}

.section-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
  display: block;
}

.section-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-md);
}

/* Horizontal rules */
.rule {
  border: none;
  height: 1px;
  background: var(--rule-color);
  margin: var(--space-lg) 0;
}

.rule--accent {
  height: 2px;
  background: var(--accent);
  width: 60px;
}

/* --- Scroll Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger children */
.stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger.visible > *:nth-child(5) { transition-delay: 0.4s; }
.stagger.visible > *:nth-child(6) { transition-delay: 0.5s; }
.stagger.visible > *:nth-child(7) { transition-delay: 0.6s; }
.stagger.visible > *:nth-child(8) { transition-delay: 0.7s; }

.stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   HEADER / NAV
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) 0;
  transition: background 0.4s ease, padding 0.4s ease;
}

.site-header.scrolled {
  background: rgba(26, 26, 24, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 0.6rem 0;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  padding-bottom: var(--space-xl);
  padding-top: calc(var(--space-2xl) + 4rem);
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  width: 100%;
}

.hero-name {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-name span {
  display: block;
}

.hero-name .name-last {
  color: var(--accent);
  font-style: italic;
}

.hero-meta {
  max-width: 500px;
  margin-left: auto;
  text-align: right;
}

.hero-title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.hero-statement {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.4;
}

.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-md);
  left: var(--gutter);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-scroll-hint::before {
  content: '';
  display: block;
  width: 30px;
  height: 1px;
  background: var(--text-muted);
}

/* ============================================
   ABOUT
   ============================================ */
.about {
  padding: var(--space-2xl) 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.about-lede {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1.5;
  color: var(--text-primary);
  font-weight: 400;
}

.about-lede strong {
  color: var(--accent);
  font-weight: 700;
}

.about-body {
  color: var(--text-secondary);
  max-width: 600px;
}

.about-body p + p {
  margin-top: var(--space-sm);
}

.pull-quote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--accent);
  border-left: 2px solid var(--accent);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  max-width: 500px;
}

/* ============================================
   EXPERIENCE
   ============================================ */
.experience {
  padding: var(--space-2xl) 0;
  background: var(--bg-secondary);
}

.experience-intro {
  margin-bottom: var(--space-xl);
}

.experience-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.exp-card {
  background: var(--bg-card);
  border: 1px solid var(--rule-color);
  padding: var(--space-md);
  position: relative;
  transition: border-color 0.3s ease;
}

.exp-card:hover {
  border-color: var(--accent);
}

.exp-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  cursor: pointer;
}

.exp-card-role {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
}

.exp-card-period {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.exp-card-company {
  font-size: var(--text-sm);
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.exp-card-summary {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-sm);
}

.exp-card-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.exp-card-details.open {
  max-height: 600px;
}

.exp-card-details ul {
  list-style: none;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--rule-color);
}

.exp-card-details li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: 0.4rem 0;
  padding-left: 1.2rem;
  position: relative;
}

.exp-card-details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 6px;
  height: 1px;
  background: var(--accent);
}

.exp-card-toggle {
  background: none;
  border: none;
  color: var(--accent);
  font-size: var(--text-xs);
  font-family: var(--font-body);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.3s ease;
}

.exp-card-toggle:hover {
  color: var(--accent-hover);
}

.exp-card-toggle .arrow {
  display: inline-block;
  transition: transform 0.3s ease;
  font-size: 0.7rem;
}

.exp-card-toggle.open .arrow {
  transform: rotate(90deg);
}

/* ============================================
   PROJECTS
   ============================================ */
.projects {
  padding: var(--space-2xl) 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.project-card {
  border: 1px solid var(--rule-color);
  padding: var(--space-md);
  position: relative;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.project-card-number {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--rule-color);
  font-weight: 900;
  line-height: 1;
  margin-bottom: var(--space-xs);
  font-style: italic;
}

.project-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
}

.project-card-tag {
  font-size: var(--text-xs);
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  display: block;
}

.project-card p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* ============================================
   SKILLS
   ============================================ */
.skills {
  padding: var(--space-2xl) 0;
  background: var(--bg-secondary);
}

.skills-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.skills-group h3 {
  font-size: var(--text-base);
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--rule-color);
  transition: border-color 0.3s ease, color 0.3s ease;
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.skill-tag--primary {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

/* ============================================
   EDUCATION
   ============================================ */
.education {
  padding: var(--space-xl) 0;
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.edu-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.edu-degree {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
}

.edu-school {
  color: var(--accent);
  font-size: var(--text-sm);
}

.edu-period {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ============================================
   WRITING / BLOG
   ============================================ */
.writing {
  padding: var(--space-2xl) 0;
  background: var(--bg-secondary);
}

.writing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.article-card {
  border-bottom: 1px solid var(--rule-color);
  padding-bottom: var(--space-md);
  transition: border-color 0.3s ease;
}

.article-card:hover {
  border-color: var(--accent);
}

.article-card-date {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
  display: block;
}

.article-card h3 {
  font-size: var(--text-lg);
  margin-bottom: 0.4rem;
  transition: color 0.3s ease;
}

.article-card:hover h3 {
  color: var(--accent);
}

.article-card p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.article-card-link {
  display: inline-block;
  margin-top: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ============================================
   CONTACT / FOOTER
   ============================================ */
.contact {
  padding: var(--space-2xl) 0 var(--space-lg);
}

.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-sm);
  font-style: italic;
}

.contact-text {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.contact-link {
  font-size: var(--text-sm);
  color: var(--text-primary);
  letter-spacing: 0.05em;
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--rule-color);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.contact-link:hover {
  border-color: var(--accent);
  background: rgba(196, 122, 90, 0.1);
  color: var(--text-primary);
}

.site-footer {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--rule-color);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-text {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablet */
@media (min-width: 640px) {
  .experience-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .edu-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .writing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }

  .skills-layout {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop */
@media (min-width: 960px) {
  .nav-toggle {
    display: none !important;
  }

  .hero-content {
    grid-template-columns: 2fr 1fr;
    align-items: end;
  }

  .about-grid {
    grid-template-columns: 5fr 4fr;
    gap: var(--space-xl);
    align-items: start;
  }

  .about-body {
    margin-left: auto;
  }

  .experience-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Asymmetric offset for first project */
  .projects-grid .project-card:first-child {
    grid-column: 1 / 2;
    transform: translateY(2rem);
  }

  .projects-grid .project-card:first-child:hover {
    transform: translateY(calc(2rem - 4px));
  }

  .skills-layout {
    grid-template-columns: repeat(4, 1fr);
  }

  .writing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Desktop */
@media (min-width: 1200px) {
  .experience-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-lede {
    font-size: var(--text-2xl);
    max-width: 90%;
  }
}

/* Mobile nav */
@media (max-width: 959px) {
  .nav-toggle {
    display: block;
    z-index: 110;
  }

  .nav-links {
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 24, 0.97);
    backdrop-filter: blur(10px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
  }

  .nav-links.open {
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    font-size: var(--text-lg);
  }

  .hero-meta {
    margin-left: 0;
    text-align: left;
  }

  .pull-quote {
    margin-left: 0;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal, .reveal-left, .reveal-right, .stagger > * {
    opacity: 1;
    transform: none;
  }
}