/* 初心 — coastal ink journal */
:root {
  --bg: #e8f0f3;
  --bg-soft: #f3f7f9;
  --bg-deep: #d5e3e8;
  --ink: #122227;
  --ink-soft: #3d555c;
  --ink-faint: #6a828a;
  --accent: #0b6e6a;
  --accent-hover: #095955;
  --accent-soft: rgba(11, 110, 106, 0.12);
  --amber: #c97816;
  --line: rgba(18, 34, 39, 0.12);
  --line-strong: rgba(18, 34, 39, 0.22);
  --glow: rgba(20, 145, 155, 0.18);
  --radius: 2px;
  --max: 1120px;
  --content: 720px;
  --font-display: "Bricolage Grotesque", "Noto Sans SC", sans-serif;
  --font-body: "Source Sans 3", "Noto Sans SC", sans-serif;
  --font-mono: "IBM Plex Mono", "Sarasa Mono SC", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

/* Language visibility — set data-lang before paint via head script */
html[data-lang="zh"] [data-lang="en"],
html:not([data-lang]) [data-lang="en"] {
  display: none !important;
}

html[data-lang="en"] [data-lang="zh"] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  background:
    radial-gradient(900px 520px at 12% -10%, rgba(20, 145, 155, 0.16), transparent 55%),
    radial-gradient(700px 480px at 92% 8%, rgba(11, 110, 106, 0.08), transparent 50%),
    linear-gradient(180deg, #eef5f7 0%, var(--bg) 38%, #e4edf1 100%);
  background-attachment: fixed;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 85%);
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.2s var(--ease);
}

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

::selection {
  background: var(--accent-soft);
  color: var(--ink);
}

.site-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

.wrap-narrow {
  width: min(var(--content), calc(100% - 2.5rem));
  margin-inline: auto;
}

/* Nav */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(243, 247, 249, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-nav.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 247, 249, 0.92);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand__mark {
  font-size: 1.45rem;
  line-height: 1;
}

.brand__dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-0.15rem);
  box-shadow: 0 0 0 0 rgba(11, 110, 106, 0.35);
  animation: pulse-dot 2.8s var(--ease) infinite;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.85rem 1.35rem;
}

.nav-links {
  order: 1;
  display: flex;
  align-items: center;
  gap: 0.25rem 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  position: relative;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s var(--ease);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  transform: scaleX(1);
}

.nav-toggle {
  order: 2;
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line-strong);
  background: var(--bg-soft);
  color: var(--ink);
  cursor: pointer;
}

.lang-switch {
  order: 3;
  flex-shrink: 0;
  min-width: 2.75rem;
  height: 2.2rem;
  padding: 0 0.65rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.lang-switch:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.nav-toggle span {
  display: block;
  width: 1.1rem;
  height: 1.5px;
  margin: 0.28rem auto;
  background: currentColor;
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

/* Hero */
.hero {
  position: relative;
  min-height: min(92vh, 760px);
  display: grid;
  align-items: end;
  padding: 5.5rem 0 4.5rem;
  overflow: hidden;
}

.hero__atmosphere {
  position: absolute;
  inset: -10% -5% auto;
  height: 75%;
  background:
    radial-gradient(circle at 30% 40%, var(--glow), transparent 42%),
    radial-gradient(circle at 72% 28%, rgba(61, 85, 92, 0.1), transparent 42%),
    linear-gradient(135deg, rgba(11, 110, 106, 0.1), transparent 55%);
  filter: blur(8px);
  animation: drift 14s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.5rem;
}

.hero__brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(4.8rem, 14vw, 8.5rem);
  font-weight: 720;
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero__brand span {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.45em);
  animation: rise-in 0.9s var(--ease) forwards;
}

.hero__brand span:nth-child(2) {
  animation-delay: 0.12s;
}

.hero__copy {
  max-width: 34rem;
  opacity: 0;
  transform: translateY(1.2rem);
  animation: rise-in 0.9s var(--ease) 0.28s forwards;
}

.hero__kicker {
  margin: 0 0 0.85rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.2vw, 2.1rem);
  font-weight: 620;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.hero__desc {
  margin: 0 0 1.75rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 2.85rem;
  padding: 0.65rem 1.2rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #f4fbfb;
}

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

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* Sections */
.section {
  padding: 4.5rem 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section__label {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.25rem);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.section__desc {
  margin: 0.65rem 0 0;
  max-width: 36rem;
  color: var(--ink-soft);
}

/* Writing list — editorial rows, not cards */
.write-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.write-item {
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.write-item.is-visible {
  opacity: 1;
  transform: none;
}

.write-item a {
  display: grid;
  grid-template-columns: 1fr 7.5rem auto;
  gap: 0.35rem 1.25rem;
  align-items: start;
  padding: 1.35rem 0.15rem;
  color: inherit;
  text-decoration: none;
}

.write-item a:hover .write-item__title {
  color: var(--accent);
}

.write-item__date {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  padding-top: 0.35rem;
  text-align: right;
  white-space: nowrap;
}

.write-item__main {
  min-width: 0;
  display: grid;
  gap: 0.45rem;
}

.write-item__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color 0.2s var(--ease);
}

.write-item__arrow {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  padding-top: 0.35rem;
  transition: transform 0.25s var(--ease), color 0.2s;
}

.write-item a:hover .write-item__arrow {
  color: var(--accent);
  transform: translateX(4px);
}

.write-item__excerpt {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.write-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.15rem;
}

.write-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.55rem;
  border-radius: 3px;
  background: rgba(18, 34, 39, 0.07);
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

/* About / page */
.page-hero {
  padding: 4.5rem 0 2rem;
}

.page-hero h1 {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.about-panel {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 2rem;
  align-items: start;
  padding: 1.5rem 0 3rem;
}

.about-avatar {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  filter: grayscale(0.15) contrast(1.05);
}

.about-copy p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

.about-meta a {
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
}

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

/* Growth path */
.path-section {
  padding-top: 1rem;
}

.path-block {
  margin-top: 2.75rem;
}

.path-block:first-of-type {
  margin-top: 0.5rem;
}

.path-block__title {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.path-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.path-item {
  display: grid;
  grid-template-columns: 10.5rem 1fr;
  gap: 1rem 1.5rem;
  padding: 1.45rem 0;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.path-item__year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.01em;
  line-height: 1.45;
  padding-top: 0.2rem;
}

.path-item__body h4 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.path-item__role {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  font-weight: 600;
}

.path-item__note,
.path-item__meta {
  margin: 0.25rem 0 0;
  color: var(--ink-faint);
  font-size: 0.9rem;
}

.path-item__meta {
  margin-top: 0.45rem;
}

.path-item__bullets {
  margin: 0.55rem 0 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  max-width: 40rem;
}

.path-item__bullets li + li {
  margin-top: 0.35rem;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 0;
  padding: 0.25rem 0 0;
}

.cert-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 5.75rem;
  padding: 1.1rem 0.85rem;
  text-align: center;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--bg-soft);
  box-shadow: 0 1px 0 rgba(18, 34, 39, 0.04);
}

.cert-card__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.cert-card__desc {
  margin-top: 0.4rem;
  color: var(--ink-faint);
  font-size: 0.82rem;
  line-height: 1.45;
  max-width: 14em;
}

/* Article */
.article-header {
  padding: 4rem 0 1.5rem;
}

.article-header h1 {
  margin: 0.55rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.2vw, 2.8rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1.1rem;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

.article-meta .cat {
  color: var(--amber);
}

.article-lang-note {
  margin: 1rem 0 0;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.prose {
  padding: 1rem 0 4rem;
  color: var(--ink);
}

.prose > *:first-child {
  margin-top: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 2.2rem 0 0.85rem;
}

.prose h1 { font-size: 1.55rem; }
.prose h2 { font-size: 1.35rem; }
.prose h3 { font-size: 1.15rem; }

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose table,
.prose pre,
.prose figure {
  margin: 0 0 1.15rem;
}

.prose li + li {
  margin-top: 0.35rem;
}

.prose blockquote {
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
}

.prose img {
  margin: 1.25rem auto;
  border: 1px solid var(--line);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.prose th,
.prose td {
  border: 1px solid var(--line-strong);
  padding: 0.55rem 0.7rem;
  text-align: left;
}

.prose th {
  background: rgba(11, 110, 106, 0.08);
}

.prose .highlight,
.prose pre,
.prose figure.highlight {
  overflow-x: auto;
  background: #15262b;
  color: #d7e6ea;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.55;
}

.prose figure.highlight {
  margin: 0 0 1.25rem;
  padding: 0;
}

.prose figure.highlight table {
  margin: 0;
  border: 0;
}

.prose figure.highlight td {
  border: 0;
  padding: 0;
  vertical-align: top;
}

.prose figure.highlight .gutter {
  user-select: none;
  opacity: 0.35;
  padding: 1rem 0.4rem 1rem 0.9rem;
}

.prose figure.highlight .code {
  padding: 1rem 1rem 1rem 0.5rem;
  width: 100%;
}

.prose figure.highlight pre {
  margin: 0;
  background: transparent;
  overflow: visible;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.prose :not(pre) > code {
  padding: 0.1em 0.35em;
  background: var(--accent-soft);
  color: var(--accent-hover);
  border-radius: 2px;
}

.prose .headerlink {
  display: none;
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 3.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
}

.article-nav a {
  text-decoration: none;
  color: var(--ink-soft);
}

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

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  color: var(--ink-faint);
  font-size: 0.9rem;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

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

/* Motion helpers */
.reveal {
  opacity: 0;
  transform: translateY(1.1rem);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}

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

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

@keyframes drift {
  from { transform: translate3d(-1%, 0, 0) scale(1); }
  to { transform: translate3d(2%, 2%, 0) scale(1.04); }
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(11, 110, 106, 0.35); }
  50% { box-shadow: 0 0 0 8px rgba(11, 110, 106, 0); }
}

@media (max-width: 860px) {
  .write-item a {
    grid-template-columns: 1fr auto;
    gap: 0.35rem 0.75rem;
  }

  .write-item__main {
    grid-column: 1;
  }

  .write-item__date {
    grid-column: 1;
    grid-row: 2;
    text-align: left;
    padding-top: 0;
  }

  .write-item__arrow {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
  }

  .about-panel {
    grid-template-columns: 1fr;
  }

  .path-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .wrap,
  .wrap-narrow {
    width: calc(100% - 1.75rem);
  }

  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1rem 1rem;
    background: rgba(243, 247, 249, 0.97);
    border-bottom: 1px solid var(--line);
  }

  .nav-right {
    gap: 0.55rem;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: 0.75rem 0;
  }

  .hero {
    min-height: auto;
    padding: 3.5rem 0 3rem;
  }

  .write-item a {
    grid-template-columns: 1fr;
  }

  .write-item__date {
    text-align: left;
  }

  .write-item__arrow {
    display: none;
  }
}

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

  .hero__brand span,
  .hero__copy,
  .write-item,
  .reveal {
    opacity: 1;
    transform: none;
  }
}