/* ============================================
   TOKENS
   ============================================ */
:root {
  --bg-base: #fafaf8;
  --bg-card: #ffffff;
  --border-subtle: #e7e6e1;
  --border-strong: #d8d6cf;

  --green: #5fb8c9;
  --green-deep: #3a96a8;
  --green-tint: #eaf6f8;
  --green-tint-soft: #f3fafb;

  --amber: #6b7280;
  --amber-deep: #454b54;
  --amber-tint: #f1f2f4;
  --amber-tint-soft: #f7f8f9;

  --ink: #1a1d1b;
  --ink-soft: #242724;

  --text-primary: #1a1d1b;
  --text-muted: #5f6660;
  --text-faint: #9a9f97;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --rail-width: 230px;
  --content-max: 760px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 1px 2px rgba(26, 29, 27, 0.04), 0 1px 8px rgba(26, 29, 27, 0.03);
  --shadow-card-hover: 0 4px 16px rgba(26, 29, 27, 0.06), 0 1px 3px rgba(26, 29, 27, 0.04);
}

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

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ============================================
   BACKGROUND ATMOSPHERE
   ============================================ */
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-glow::before {
  content: '';
  position: absolute;
  inset: -10%;
  background:
    radial-gradient(ellipse 700px 480px at 78% 4%, rgba(95, 184, 201, 0.20) 0%, transparent 62%),
    radial-gradient(ellipse 600px 420px at 14% 30%, rgba(107, 114, 128, 0.10) 0%, transparent 60%),
    radial-gradient(ellipse 800px 560px at 60% 88%, rgba(95, 184, 201, 0.12) 0%, transparent 65%);
  animation: drift 26s ease-in-out infinite;
}

.bg-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(26, 29, 27, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 15%, black 0%, transparent 75%);
  opacity: 0.5;
}

@keyframes drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-2%, 2%) scale(1.04); }
  66% { transform: translate(2%, -1%) scale(1.02); }
}

@media (prefers-reduced-motion: reduce) {
  .bg-glow::before { animation: none; }
}

/* ============================================
   LEFT RAIL NAV
   ============================================ */
.rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rail-width);
  display: flex;
  flex-direction: column;
  padding: 40px 0 28px;
  border-right: 1px solid var(--border-subtle);
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.rail-top { padding: 0 32px 32px; }

.rail-logo {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.rail-nav {
  list-style: none;
  flex: 1;
}

.rail-link {
  display: block;
  padding: 10px 32px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-faint);
  text-decoration: none;
  transition: color 0.2s var(--ease);
  position: relative;
}

.rail-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: var(--green);
  transform: scaleY(0);
  transition: transform 0.25s var(--ease);
}

.rail-link:hover { color: var(--text-muted); }

.rail-link.active {
  color: var(--text-primary);
  font-weight: 600;
}

.rail-link.active::before { transform: scaleY(1); }

.rail-bottom { padding: 0 32px; }

.rail-resume {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--green-deep);
  text-decoration: none;
  transition: gap 0.2s var(--ease);
}

.rail-resume:hover { gap: 9px; }

.rail-resume-arrow { font-size: 13px; }

/* ============================================
   LAYOUT
   ============================================ */
main {
  margin-left: var(--rail-width);
  position: relative;
  z-index: 1;
}

.section {
  max-width: var(--content-max);
  padding: 110px 48px;
  margin: 0 auto;
}

.section-head { margin-bottom: 36px; }

.section-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}

.section-sub {
  color: var(--text-muted);
  font-size: 15.5px;
}

/* ============================================
   BENTO LAYOUT (asymmetric pairing)
   ============================================ */
.bento {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
  align-items: stretch;
}

.bento-reverse {
  grid-template-columns: 1fr 1.1fr;
}

/* ============================================
   CHIPS (core stack)
   ============================================ */
.chip-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.chip {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.chip:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.chip-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.chip-desc {
  font-size: 12px;
  color: var(--text-faint);
}

.chip-green {
  background: var(--green-tint-soft);
  border-color: rgba(29, 154, 108, 0.25);
}

.chip-green .chip-name { color: var(--green-deep); }

.chip-amber {
  background: var(--amber-tint-soft);
  border-color: rgba(232, 118, 58, 0.25);
}

.chip-amber .chip-name { color: var(--amber-deep); }

/* ============================================
   CALLOUT VARIANTS
   ============================================ */
.callout-tall {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.callout-big {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.callout-big strong {
  color: var(--green-deep);
}

.callout-amber {
  border-left-color: var(--amber);
  background: var(--amber-tint-soft);
}

.callout-amber .callout-big strong {
  color: var(--amber-deep);
}

.principle-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 24px;
}

.principle-grid li { border-bottom: none; padding: 10px 0; }

/* ============================================
   HERO
   ============================================ */
.hero {
  padding-top: 130px;
  padding-bottom: 100px;
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
}

.hero-viz {
  position: absolute;
  top: 0;
  right: -4%;
  width: 540px;
  height: 540px;
  z-index: 0;
  opacity: 0.9;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 620px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--green-deep);
  background: var(--green-tint);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-name {
  font-size: clamp(60px, 8vw, 104px);
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 0.98;
  margin-bottom: 16px;
  background: linear-gradient(105deg, var(--ink) 25%, var(--green-deep) 48%, var(--amber-deep) 62%, var(--ink) 85%);
  background-size: 250% 100%;
  background-position: 0% 50%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: name-sheen 9s ease-in-out infinite;
}

@keyframes name-sheen {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-name { animation: none; }
}

.hero-role {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.hero-desc {
  max-width: 580px;
  font-size: 16.5px;
  color: var(--text-muted);
  margin-bottom: 44px;
}

.hero-stats {
  display: flex;
  gap: 44px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-value {
  font-size: 26px;
  font-weight: 800;
  color: var(--green-deep);
  letter-spacing: -0.01em;
}

.stat-accent .stat-value {
  color: var(--amber-deep);
}

.stat-label {
  font-size: 12.5px;
  color: var(--text-faint);
  font-weight: 500;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 9px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s var(--ease);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--green);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(29, 154, 108, 0.25);
}

.btn-primary:hover {
  background: var(--green-deep);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(29, 154, 108, 0.3);
}

.btn-ghost {
  border-color: var(--border-strong);
  color: var(--text-primary);
  background: var(--bg-card);
}

.btn-ghost:hover {
  border-color: var(--green);
  color: var(--green-deep);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 28px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-card);
}

.card-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 16px;
  display: block;
}

.card-text {
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.65;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
}

.callout {
  border-left: 3px solid var(--green);
  background: var(--green-tint-soft);
  border-top-color: var(--border-subtle);
  border-right-color: var(--border-subtle);
  border-bottom-color: var(--border-subtle);
}

.callout p {
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

/* ============================================
   LISTS
   ============================================ */
.service-list, .principle-list {
  list-style: none;
}

.service-list li, .principle-list li {
  font-size: 14px;
  color: var(--text-muted);
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.service-list.compact li { padding: 7px 0; }

.service-list li:last-child, .principle-list li:last-child {
  border-bottom: none;
}

.service-list strong {
  color: var(--text-primary);
  font-weight: 600;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
  margin-top: 6px;
}

.principle-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
  margin-top: 6px;
}

/* ============================================
   DIAGRAM CARD
   ============================================ */
.diagram-card { padding: 24px; }

.topology-wrap {
  width: 100%;
  overflow-x: auto;
}

.topology-wrap svg {
  width: 100%;
  height: auto;
  min-width: 600px;
  display: block;
}

/* ============================================
   PROJECT CARDS
   ============================================ */
.project-card {
  transition: box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
  border-top: 3px solid var(--border-subtle);
}

.project-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.project-green { border-top-color: var(--green); }
.project-amber { border-top-color: var(--amber); }
.project-dark { border-top-color: var(--ink); }

.project-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

/* ============================================
   EXPERIENCE CARD
   ============================================ */
.experience-card {
  border-left: 3px solid var(--green);
  padding: 32px;
}

.experience-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.experience-head h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-date {
  font-size: 13px;
  color: var(--text-faint);
  font-weight: 600;
  white-space: nowrap;
  background: var(--bg-base);
  padding: 5px 12px;
  border-radius: 100px;
}

.timeline-org {
  color: var(--green-deep);
  font-size: 14px;
  font-weight: 600;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

a.contact-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.contact-accent {
  background: var(--green);
  border-color: var(--green);
}

.contact-accent .card-label,
.contact-accent .contact-value {
  color: #ffffff;
}

.contact-accent .card-label { opacity: 0.85; }

.contact-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
}

.footer {
  display: flex;
  gap: 10px;
  font-size: 13px;
  color: var(--text-faint);
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.footer-divider { color: var(--border-strong); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .bento, .bento-reverse { grid-template-columns: 1fr; }
  .chip-grid { grid-template-columns: 1fr; }
  .principle-grid { grid-template-columns: 1fr; }
  .hero-viz { width: 380px; height: 380px; opacity: 0.6; }
}

@media (max-width: 768px) {
  .rail {
    width: 100%;
    height: auto;
    position: fixed;
    bottom: 0;
    top: auto;
    flex-direction: row;
    padding: 0;
    border-right: none;
    border-top: 1px solid var(--border-subtle);
    overflow-x: auto;
  }
  .rail-top, .rail-bottom { display: none; }
  .rail-nav { display: flex; flex: 1; }
  .rail-link { padding: 16px 18px; white-space: nowrap; }
  main { margin-left: 0; padding-bottom: 64px; }
  .section { padding: 64px 24px; }
  .hero { padding-top: 64px; min-height: auto; }
  .hero-stats { gap: 28px; }
  .hero-viz { display: none; }
  .experience-head { flex-direction: column; }
}

/* Keyboard focus visibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 4px;
}