:root {
  --ink: #0a1210;
  --ink-soft: #14201c;
  --surface: #f3f6f4;
  --surface-2: #e7eee9;
  --line: rgba(10, 18, 16, 0.12);
  --line-strong: rgba(10, 18, 16, 0.22);
  --text: #1a2622;
  --muted: #5a6b64;
  --teal: #0f7a66;
  --teal-bright: #1aa887;
  --amber: #c47a1a;
  --cream: #f7faf8;
  --white: #ffffff;
  --hero-text: #eef6f2;
  --hero-muted: #a8c4b8;
  --radius: 2px;
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "Figtree", system-ui, sans-serif;
  --shadow: 0 24px 60px rgba(10, 18, 16, 0.18);
  --max: 1120px;
  --header-h: 4.25rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 100% 0%, rgba(26, 168, 135, 0.07), transparent 55%),
    linear-gradient(180deg, var(--cream) 0%, var(--surface) 40%, var(--surface-2) 100%);
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  background: var(--teal);
  color: white;
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(243, 246, 244, 0.82);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 246, 244, 0.94);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

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

.brand-mark {
  width: 1.35rem;
  height: 1.35rem;
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-bright) 55%, #8fd9c4 100%);
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  animation: pulse-mark 4s ease-in-out infinite;
}

@keyframes pulse-mark {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.06); opacity: 0.88; }
}

.nav {
  display: flex;
  gap: 1.35rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
}

.nav a:hover {
  color: var(--teal);
}

/* Hero */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
  overflow: hidden;
}

.hero-atmosphere {
  position: absolute;
  inset: -10% -5% 0;
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 122, 102, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 122, 102, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 70% 40%, black 20%, transparent 75%);
  animation: grid-drift 28s linear infinite;
}

@keyframes grid-drift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-48px, -48px, 0); }
}

.hero-glow {
  position: absolute;
  width: 55%;
  height: 70%;
  right: -5%;
  top: 5%;
  background: radial-gradient(circle, rgba(15, 122, 102, 0.22), transparent 68%);
  filter: blur(8px);
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.45;
}

.hero-orb-a {
  width: 220px;
  height: 220px;
  background: #1aa887;
  top: 18%;
  right: 18%;
  animation: float-a 9s ease-in-out infinite;
}

.hero-orb-b {
  width: 160px;
  height: 160px;
  background: #c47a1a;
  bottom: 22%;
  right: 8%;
  opacity: 0.25;
  animation: float-b 11s ease-in-out infinite;
}

@keyframes float-a {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-18px, 22px); }
}

@keyframes float-b {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(14px, -16px); }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.65rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
  background: linear-gradient(120deg, var(--ink) 30%, var(--teal) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: brand-in 0.9s ease-out both;
}

.hero-title {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.2vw, 3.15rem);
  letter-spacing: -0.035em;
  line-height: 1.08;
  color: var(--ink);
  animation: rise-in 0.9s 0.12s ease-out both;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.12rem;
  animation: rise-in 0.9s 0.22s ease-out both;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: rise-in 0.9s 0.32s ease-out both;
}

@keyframes brand-in {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to { opacity: 1; transform: none; }
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.35rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  color: inherit;
}

.btn-primary {
  background: var(--ink);
  color: var(--cream);
}

.btn-primary:hover {
  background: var(--teal);
  color: white;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--text);
}

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

.hero-visual {
  position: relative;
  z-index: 1;
  animation: rise-in 1s 0.2s ease-out both;
}

.blueprint {
  position: relative;
  background: linear-gradient(160deg, #0d1a16 0%, #122620 55%, #0a1411 100%);
  color: var(--hero-text);
  border: 1px solid rgba(26, 168, 135, 0.28);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.35rem 1.35rem;
  min-height: 280px;
  overflow: hidden;
}

.blueprint::before {
  content: "SKILL.md";
  position: absolute;
  top: 0.85rem;
  right: 1rem;
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--hero-muted);
}

.blueprint-scan {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(26, 168, 135, 0.85), transparent);
  animation: scan 3.6s ease-in-out infinite;
  opacity: 0.7;
}

@keyframes scan {
  0% { top: 8%; opacity: 0; }
  15% { opacity: 0.8; }
  85% { opacity: 0.8; }
  100% { top: 92%; opacity: 0; }
}

.blueprint-code {
  margin: 1.5rem 0 0;
  font-family: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
  font-size: 0.82rem;
  line-height: 1.7;
  color: #c5ddd4;
  white-space: pre-wrap;
}

.c-key {
  color: #5ee0bc;
}

/* Stats */
.stats {
  border-block: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.stats-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.75rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.stat-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--muted);
  font-weight: 500;
}

/* Sections */
.section-head {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
}

.section-head h2,
.how-inner h2 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-lead {
  margin: 0;
  max-width: 36rem;
  color: var(--muted);
}

.catalog {
  padding: 4.5rem 0 3rem;
}

.toolbar {
  max-width: var(--max);
  margin: 2rem auto 0;
  padding: 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.filter {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.86rem;
  font-weight: 600;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.filter:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.filter.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

.search input {
  width: min(260px, 100vw - 3rem);
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(15, 122, 102, 0.15);
}

.skill-list {
  list-style: none;
  margin: 1.75rem auto 0;
  padding: 0 1.5rem;
  max-width: var(--max);
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.skill-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr auto;
  gap: 1.25rem;
  align-items: start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(16px);
  animation: row-in 0.55s ease forwards;
  transition: background 0.25s ease;
}

.skill-row:hover {
  background: linear-gradient(90deg, rgba(15, 122, 102, 0.05), transparent 70%);
}

@keyframes row-in {
  to { opacity: 1; transform: none; }
}

.skill-count {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.85rem;
  letter-spacing: -0.04em;
  color: var(--teal);
  line-height: 1;
  padding-top: 0.15rem;
}

.skill-count span {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.skill-body h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.skill-body h3 a {
  text-decoration: none;
}

.skill-body h3 a:hover {
  color: var(--teal);
}

.skill-desc {
  margin: 0 0 0.75rem;
  color: var(--muted);
  max-width: 46rem;
  font-size: 0.98rem;
}

.skill-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--line);
  padding: 0.22rem 0.5rem;
}

.tag-cat {
  background: rgba(15, 122, 102, 0.1);
  border-color: rgba(15, 122, 102, 0.22);
  color: var(--teal);
  text-transform: capitalize;
}

.skill-actions {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  align-items: stretch;
  min-width: 8.5rem;
}

.skill-actions a {
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.skill-actions a:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.skill-actions a.primary-link {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

.skill-actions a.primary-link:hover {
  background: var(--teal);
  border-color: var(--teal);
  color: white;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1.5rem;
}

/* How */
.how {
  padding: 2rem 0 5rem;
}

.how-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  background:
    linear-gradient(135deg, rgba(15, 122, 102, 0.08), transparent 40%),
    linear-gradient(180deg, #ffffff, var(--surface));
  border: 1px solid var(--line);
}

.how-steps {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.how-steps li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  align-items: start;
}

.step-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--teal);
  letter-spacing: -0.02em;
}

.how-steps h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.how-steps p {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: #c5d5ce;
  padding: 2.75rem 0 2rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  gap: 1.25rem;
}

.footer-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--cream);
  letter-spacing: -0.02em;
}

.footer-bio {
  margin: 0.35rem 0 0;
  font-size: 0.95rem;
  color: #8aa398;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-links a {
  color: #d7e8e0;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
}

.footer-links a:hover {
  color: #5ee0bc;
}

.footer-copy {
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  color: #6d847a;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.1rem;
}

/* Reveal */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* Responsive */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2rem;
  }

  .hero-visual {
    order: -1;
    max-width: 520px;
  }

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

  .skill-row {
    grid-template-columns: 4.5rem 1fr;
  }

  .skill-actions {
    grid-column: 2;
    flex-direction: row;
    flex-wrap: wrap;
    min-width: 0;
  }
}

@media (max-width: 560px) {
  .nav a:nth-child(2) {
    display: none;
  }

  .skill-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .skill-actions {
    grid-column: 1;
  }

  .skill-count {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    font-size: 1.4rem;
  }

  .skill-count span {
    margin-top: 0;
  }

  .hero-title br {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}