:root {
  --ink: #10222a;
  --ink-soft: #3a4f59;
  --paper: #eef3f5;
  --paper-deep: #d7e3e8;
  --brand: #0b5c57;
  --brand-deep: #083f3b;
  --accent: #c45c26;
  --line: rgba(16, 34, 42, 0.12);
  --glow: rgba(11, 92, 87, 0.18);
  --font-display: "Syne", "Segoe UI", sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", sans-serif;
  --max: 68rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.65;
  background: var(--paper);
  overflow-x: hidden;
}

a {
  color: var(--brand-deep);
  text-underline-offset: 0.18em;
}

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

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 20;
  background: white;
  padding: 0.5rem 0.75rem;
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: clamp(1.5rem, 4vw, 3rem);
  color: #f4f8f9;
  isolation: isolate;
  overflow: hidden;
}

.hero__plane {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(120% 80% at 12% 18%, rgba(196, 92, 38, 0.28), transparent 55%),
    radial-gradient(90% 70% at 88% 12%, rgba(11, 92, 87, 0.55), transparent 50%),
    linear-gradient(160deg, #06161b 0%, #0c2f34 42%, #163a42 100%);
  animation: plane-shift 18s ease-in-out infinite alternate;
}

.hero__mesh {
  position: absolute;
  inset: -10%;
  z-index: -1;
  opacity: 0.45;
  background-image:
    linear-gradient(rgba(238, 243, 245, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(238, 243, 245, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  transform: rotate(-6deg) scale(1.2);
  animation: mesh-drift 22s linear infinite;
  pointer-events: none;
}

.hero__orb {
  position: absolute;
  width: min(48vw, 28rem);
  aspect-ratio: 1;
  right: -6%;
  top: 8%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, rgba(238, 243, 245, 0.35), transparent 42%),
    radial-gradient(circle at 60% 60%, rgba(11, 92, 87, 0.9), rgba(6, 22, 27, 0.1) 70%);
  filter: blur(2px);
  animation: orb-breathe 9s ease-in-out infinite;
  z-index: -1;
  pointer-events: none;
}

.hero__inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding-bottom: clamp(2rem, 8vh, 5rem);
}

.brand {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 9vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.95;
  opacity: 0;
  animation: rise 0.9s ease forwards 0.1s;
}

.headline {
  margin: 0 0 1rem;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  opacity: 0;
  animation: rise 0.9s ease forwards 0.28s;
}

.lede {
  margin: 0 0 2rem;
  max-width: 36rem;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: rgba(244, 248, 249, 0.82);
  opacity: 0;
  animation: rise 0.9s ease forwards 0.42s;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1rem;
  opacity: 0;
  animation: rise 0.9s ease forwards 0.55s;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  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);
}

.btn--primary {
  background: #f4f8f9;
  color: var(--brand-deep);
}

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

.btn--ghost {
  border-color: rgba(244, 248, 249, 0.35);
  color: #f4f8f9;
  background: transparent;
}

.btn--ghost:hover {
  border-color: #f4f8f9;
  color: #fff;
}

.cta-row--page {
  margin-top: 1.5rem;
  opacity: 1;
  animation: none;
}

.btn--solid {
  background: var(--brand);
  color: #f4f8f9;
}

.btn--solid:hover {
  background: var(--brand-deep);
  color: #fff;
}

.btn--outline {
  border-color: var(--line);
  color: var(--brand-deep);
  background: transparent;
}

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

/* —— Page sections —— */
main {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5.5rem) clamp(1.5rem, 4vw, 3rem);
}

.section {
  padding: clamp(2.5rem, 6vw, 4rem) 0;
  border-top: 1px solid var(--line);
}

.section:first-child {
  border-top: 0;
  padding-top: 0;
}

.section h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.35rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section p {
  margin: 0 0 1rem;
  max-width: 42rem;
  color: var(--ink-soft);
}

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

.pillars {
  display: grid;
  gap: 1.75rem;
  margin: 1.75rem 0 0;
}

@media (min-width: 720px) {
  .pillars {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

.pillar h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.pillar p {
  margin: 0;
  font-size: 1.02rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.25rem;
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.meta a {
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

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

/* —— Blog (compact pages under /blog) —— */
.topbar {
  padding: 1.25rem clamp(1.5rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(11, 92, 87, 0.08), transparent 70%),
    var(--paper);
}

.topbar__inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.topbar__brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--brand-deep);
  text-decoration: none;
}

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

.topbar__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.topbar__nav a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-head {
  margin: 0 0 2rem;
}

.page-head h1 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.85rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.page-head p {
  margin: 0;
  max-width: 36rem;
  color: var(--ink-soft);
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.75rem;
}

.post-list li {
  padding: 0;
  border: 0;
}

.post-list a {
  text-decoration: none;
  color: inherit;
}

.post-list h2 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  letter-spacing: -0.02em;
  color: var(--brand-deep);
}

.post-list a:hover h2 {
  color: var(--accent);
}

.post-list .date {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.post-list p {
  margin: 0;
  max-width: 40rem;
  color: var(--ink-soft);
}

.article {
  max-width: 42rem;
}

.article__meta {
  margin: 0 0 1.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.article h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.5vw, 2.6rem);
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.article p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
}

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

.article strong {
  color: var(--ink);
}

.observe {
  margin: 1.75rem 0;
  padding: 1.15rem 1.25rem 1.25rem;
  border-left: 3px solid var(--brand);
  background: linear-gradient(90deg, rgba(11, 92, 87, 0.07), transparent 85%);
}

.observe__label {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand-deep);
}

.observe p {
  margin: 0 0 0.85rem;
  font-size: 1.02rem;
}

.observe p:last-of-type {
  margin-bottom: 0.85rem;
}

.observe .src {
  display: inline-block;
  margin: 0 0 0.65rem;
  font-size: 0.82rem;
  font-weight: 600;
  word-break: break-all;
}

.article pre {
  margin: 0;
  padding: 0.95rem 1rem;
  overflow-x: auto;
  border-radius: 0.35rem;
  background: #0c2f34;
  color: #e8f0f2;
  font-size: 0.82rem;
  line-height: 1.45;
}

.article pre code {
  font-family: "Cascadia Code", "Consolas", "Segoe UI Mono", monospace;
  white-space: pre;
}

.back-link {
  display: inline-block;
  margin-top: 2.5rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.back-link:hover {
  border-color: var(--accent);
}

.diary-ai-note {
  margin: 2.75rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  max-width: 42rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.diary-ai-note p {
  margin: 0;
  max-width: none;
  color: inherit;
}

footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem clamp(1.5rem, 4vw, 3rem) 2.5rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

footer .inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: baseline;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(1.1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes plane-shift {
  from {
    filter: hue-rotate(0deg) saturate(1);
  }
  to {
    filter: hue-rotate(12deg) saturate(1.08);
  }
}

@keyframes mesh-drift {
  from {
    transform: rotate(-6deg) scale(1.2) translate3d(0, 0, 0);
  }
  to {
    transform: rotate(-6deg) scale(1.2) translate3d(-36px, 24px, 0);
  }
}

@keyframes orb-breathe {
  0%,
  100% {
    transform: scale(1) translate(0, 0);
    opacity: 0.9;
  }
  50% {
    transform: scale(1.06) translate(-2%, 3%);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .brand,
  .headline,
  .lede,
  .cta-row {
    opacity: 1;
  }
}