/* =============================================================================
   1. Design Tokens
   ============================================================================= */
:root {
  --bg:         #0e0e0e;
  --surface:    #1a1a1a;
  --border:     #2a2a2a;
  --text:       #f0f0f0;
  --text-muted: #888888;
  --accent:     #ff3366;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;

  --section-padding: 120px 0;
  --container-max:   1200px;
  --container-pad:   40px;
  --gap:             32px;
}

/* =============================================================================
   2. Reset + Base
   ============================================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* =============================================================================
   3. Typography
   ============================================================================= */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.display-hero {
  font-size: clamp(56px, 8vw, 96px);
}

.display-section {
  font-size: clamp(32px, 5vw, 56px);
}

.display-card {
  font-size: 22px;
  font-weight: 600;
}

.label {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

p {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* =============================================================================
   4. Layout
   ============================================================================= */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

section {
  padding: var(--section-padding);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

/* =============================================================================
   5. Navbar
   ============================================================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 24px 0;
  transition: background 0.3s ease, padding 0.3s ease, border-bottom 0.3s ease;
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(14, 14, 14, 0.95);
  backdrop-filter: blur(12px);
  padding: 16px 0;
  border-bottom-color: var(--border);
}

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

.navbar-logo {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  transition: color 0.2s;
}

.navbar-logo:hover {
  color: var(--accent);
}

.navbar-links {
  display: flex;
  gap: 40px;
  align-items: center;
}

.navbar-links a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--text);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s ease;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

.mobile-menu a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.mobile-menu a:hover {
  color: var(--text);
}

.mobile-menu.open {
  display: flex;
}

/* =============================================================================
   6. Hero
   ============================================================================= */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 80px;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-accent-line {
  width: 56px;
  height: 3px;
  background: var(--accent);
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(68px, 10vw, 124px);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-weight: 400;
  margin-bottom: 48px;
}

.hero-scroll {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s;
}

.hero-scroll:hover {
  color: var(--text);
}

/* Page hero (about, contact, playground) */
.page-hero {
  padding-top: 160px;
  padding-bottom: 80px;
}

.page-hero h1 {
  font-size: clamp(48px, 7vw, 80px);
  margin-bottom: 16px;
}

.page-hero .hero-subtitle {
  font-size: 18px;
  margin-bottom: 0;
}

/* =============================================================================
   7. Sections + Cards
   ============================================================================= */
.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 4vw, 52px);
  margin-bottom: 56px;
}

/* Case Cards */
.cases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease;
  text-decoration: none;
  display: block;
}

.case-card:hover {
  transform: translateY(-4px);
  border-color: #444;
}

.case-card-image {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #111;
}

.case-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.case-card:hover .case-card-image img {
  transform: scale(1.04);
}

.case-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(14, 14, 14, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.case-card:hover .case-card-overlay {
  opacity: 1;
}

.case-card-body {
  padding: 24px;
}

.case-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.case-card-category {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.case-card-year {
  font-size: 12px;
  color: var(--text-muted);
}

.case-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}

.case-card-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
  line-height: 1.5;
}

/* NDA card */
.case-card.nda {
  opacity: 0.45;
  pointer-events: none;
}

.nda-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--border);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 2px;
}

/* About teaser */
.about-teaser {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-teaser-stats {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.stat-item {
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Playground teaser */
.playground-teaser {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.playground-card-placeholder {
  border: 2px dashed var(--border);
  border-radius: 4px;
  padding: 64px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  max-width: 480px;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

.skill-block {
  border-top: 1px solid var(--border);
  padding-top: 24px;
}

.skill-block h3 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
  color: var(--text);
}

.skill-block ul {
  list-style: none;
}

.skill-block li {
  font-size: 14px;
  color: var(--text-muted);
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-block li::before {
  content: '•';
  color: var(--accent);
  font-size: 16px;
  flex-shrink: 0;
}

/* Experience timeline */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.experience-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.experience-item:first-child {
  border-top: 1px solid var(--border);
}

.experience-period {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-body);
  padding-top: 2px;
}

.experience-company {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.experience-role {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 400;
}

.experience-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

/* NNG Certificate */
.cert-block {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: start;
  padding: 48px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.cert-block img {
  width: 100%;
  border-radius: 4px;
}

.cert-content h3 {
  font-size: 24px;
  margin-bottom: 12px;
}

.cert-content p {
  margin-bottom: 16px;
}

.cert-id {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-body);
}

.cert-id a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color 0.2s;
}

.cert-id a:hover {
  text-decoration-color: var(--accent);
}

/* Bio layout */
.bio-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 80px;
  align-items: start;
}

.bio-photo {
  position: sticky;
  top: 120px;
}

.bio-photo img {
  border-radius: 50%;
  width: 160px;
  height: 160px;
  object-fit: cover;
  border: 3px solid var(--border);
  margin-bottom: 24px;
}

.bio-photo-meta p {
  font-size: 14px;
  margin-bottom: 4px;
}

.bio-text p {
  margin-bottom: 20px;
  font-size: 17px;
  line-height: 1.8;
}

.bio-text p:last-child {
  margin-bottom: 0;
}

/* =============================================================================
   8. Buttons
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 28px;
  border-radius: 2px;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #e6002d;
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 0;
  letter-spacing: 0;
  font-size: 15px;
  font-weight: 500;
  text-transform: none;
}

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

/* =============================================================================
   9. Forms
   ============================================================================= */
.form-group {
  margin-bottom: 24px;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  padding: 14px 18px;
  transition: border-color 0.2s;
  outline: none;
  -webkit-appearance: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  min-height: 160px;
}

input::placeholder,
textarea::placeholder {
  color: #555;
}

/* =============================================================================
   10. Footer
   ============================================================================= */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

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

.footer-logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: color 0.2s;
}

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

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

/* =============================================================================
   11. Animations
   ============================================================================= */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* =============================================================================
   12. Responsive
   ============================================================================= */
@media (max-width: 960px) {
  :root {
    --section-padding: 80px 0;
    --container-pad: 24px;
  }

  .navbar-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .navbar:has(.mobile-menu.open) {
    background: rgba(14, 14, 14, 0.98);
    backdrop-filter: blur(12px);
  }

  .cases-grid,
  .about-teaser,
  .bio-grid,
  .skills-grid,
  .cert-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-teaser-stats {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 24px;
  }

  .stat-item {
    flex: 1;
    min-width: 120px;
  }

  .experience-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .cert-block {
    padding: 32px 24px;
  }

  .cert-block img {
    width: 200px;
  }

  .bio-photo {
    position: static;
    display: flex;
    align-items: center;
    gap: 24px;
    order: -1;
  }

  .bio-photo img {
    margin-bottom: 0;
    width: 80px;
    height: 80px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 600px) {
  .display-hero {
    font-size: 44px;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-teaser-stats {
    flex-direction: column;
  }
}