:root {
  color-scheme: light;
  --page: min(1160px, calc(100% - 40px));
  --ink: #172136;
  --muted: #5f6c80;
  --accent: #315fdf;
  --accent-strong: #1745c6;
  --glass: rgba(255, 255, 255, 0.32);
  --glass-strong: rgba(255, 255, 255, 0.48);
  --glass-border: rgba(255, 255, 255, 0.88);
  --line: rgba(58, 82, 132, 0.18);
  --shadow: 0 30px 90px rgba(49, 65, 112, 0.2), 0 6px 24px rgba(52, 86, 174, 0.08), inset 0 1.5px 0 rgba(255, 255, 255, 0.96), inset 0 -1px 0 rgba(89, 109, 188, 0.1);
  --shadow-soft: 0 18px 50px rgba(49, 65, 112, 0.16), inset 0 1.5px 0 rgba(255, 255, 255, 0.9), inset 0 -1px 0 rgba(109, 92, 190, 0.1);
  --radius-lg: 34px;
  --radius-md: 24px;
  --blur: blur(32px) saturate(185%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 48% -12%, rgba(255, 255, 255, 0.94) 0, rgba(232, 243, 255, 0.42) 34%, transparent 64%),
    linear-gradient(145deg, #dbeaff 0%, #f0e2ff 48%, #dff8f1 100%);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(5px);
  opacity: 0.9;
}

.glow-one {
  top: 8%;
  left: -8%;
  width: min(42vw, 620px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 60% 45%, rgba(72, 161, 255, 0.9), rgba(115, 195, 255, 0.32) 46%, rgba(130, 190, 255, 0));
}

.glow-two {
  top: 38%;
  right: -11%;
  width: min(46vw, 680px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 42% 48%, rgba(187, 112, 255, 0.78), rgba(212, 163, 255, 0.28) 50%, rgba(201, 161, 255, 0));
}

.glow-three {
  bottom: -10%;
  left: 18%;
  width: min(44vw, 650px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(60, 220, 190, 0.68), rgba(120, 224, 202, 0.24) 50%, rgba(120, 224, 202, 0));
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 9px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.glass-panel,
.glass-card,
.glass-bar {
  border: 1.25px solid var(--glass-border);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.16)),
    var(--glass);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
}

.glass-panel,
.glass-card {
  position: relative;
  overflow: hidden;
}

.glass-panel::before,
.glass-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  background:
    radial-gradient(circle at 8% 2%, rgba(255, 255, 255, 0.82), transparent 24%),
    linear-gradient(120deg, rgba(255, 255, 255, 0.55), transparent 30%, transparent 66%, rgba(255, 255, 255, 0.2));
  pointer-events: none;
}

.glass-panel::after,
.glass-card::after {
  content: "";
  position: absolute;
  top: 1px;
  left: 12%;
  z-index: 0;
  width: 48%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.96), transparent);
  box-shadow: 0 1px 8px rgba(255, 255, 255, 0.72);
  pointer-events: none;
}

.glass-panel > *,
.glass-card > * {
  position: relative;
  z-index: 1;
}

.site-header,
.site-footer,
main {
  width: var(--page);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  margin-top: 16px;
  padding: 10px 14px 10px 18px;
  border-radius: 999px;
  box-shadow: var(--shadow-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 750;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-orb {
  width: 18px;
  height: 18px;
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 28%, white 0 12%, transparent 14%),
    linear-gradient(145deg, #9fe2ff, #5577ff 52%, #bd7cff);
  box-shadow: inset -2px -3px 6px rgba(33, 49, 130, 0.28), 0 3px 9px rgba(68, 91, 190, 0.3);
}

nav {
  display: flex;
  align-items: center;
  gap: 5px;
}

nav a {
  padding: 8px 13px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  background: rgba(255, 255, 255, 0.58);
  color: var(--ink);
}

.hero {
  min-height: calc(100vh - 96px);
  display: grid;
  align-items: center;
  padding-block: 70px 86px;
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.66fr);
  gap: clamp(46px, 7vw, 96px);
  align-items: center;
  min-height: 580px;
  padding: clamp(34px, 6vw, 78px);
  border-radius: var(--radius-lg);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p,
blockquote {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.15;
}

h1 {
  max-width: 760px;
  margin-bottom: 26px;
  font-size: clamp(3.1rem, 6vw, 5.7rem);
  font-weight: 780;
  letter-spacing: -0.065em;
}

.lede {
  max-width: 650px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(1rem, 1.55vw, 1.15rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

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

.button.primary {
  background: linear-gradient(145deg, #4776f4, #2450cf);
  color: white;
  box-shadow: 0 10px 24px rgba(48, 85, 206, 0.24), inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.button.primary:hover,
.button.primary:focus-visible {
  box-shadow: 0 13px 28px rgba(48, 85, 206, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.glass-button {
  border-color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.38);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8), 0 6px 18px rgba(65, 77, 114, 0.08);
}

.glass-button:hover,
.glass-button:focus-visible {
  background: rgba(255, 255, 255, 0.64);
}

.now-card {
  padding: 27px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.now-heading {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.now-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34bd7d;
  box-shadow: 0 0 0 5px rgba(52, 189, 125, 0.12);
}

.now-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.now-item > span,
.card-topline,
.musing-index {
  color: var(--accent-strong);
  font: 750 0.72rem/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.now-item strong {
  display: block;
  margin-bottom: 5px;
}

.now-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.section {
  padding-block: 118px;
  scroll-margin-top: 90px;
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr minmax(300px, 0.78fr);
  gap: 46px;
  align-items: end;
  margin-bottom: 42px;
}

.section-heading .eyebrow {
  margin-bottom: 12px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2.5rem, 5vw, 4.6rem);
  font-weight: 760;
  letter-spacing: -0.055em;
}

.section-heading > p {
  margin-bottom: 7px;
  color: var(--muted);
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.note-card {
  min-height: 330px;
  padding: 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.note-card.featured {
  grid-column: 1 / -1;
  min-height: 650px;
  background:
    radial-gradient(circle at 12% 12%, rgba(84, 178, 255, 0.34), transparent 38%),
    radial-gradient(circle at 88% 88%, rgba(185, 113, 255, 0.27), transparent 44%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.5), rgba(235, 240, 255, 0.18));
}

.card-topline {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: auto;
}

.note-card h3 {
  max-width: 590px;
  margin-bottom: 16px;
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  letter-spacing: -0.035em;
}

.note-card:not(.featured) h3 {
  margin-top: 70px;
}

.pdf-note {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(38px, 7vw, 90px);
  align-items: center;
  padding: clamp(28px, 5vw, 58px);
}

.pdf-preview {
  position: relative;
  width: min(100%, 360px);
  margin: 0 auto;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.94);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.34);
  box-shadow: 0 24px 55px rgba(50, 67, 116, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.92);
  transform: rotate(-1.2deg);
}

.pdf-preview img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  background: white;
  box-shadow: 0 8px 24px rgba(43, 53, 86, 0.12);
}

.pdf-preview figcaption {
  padding: 12px 4px 1px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-align: center;
}

.pdf-copy .card-topline {
  margin-bottom: 64px;
}

.pdf-kicker {
  margin-bottom: 10px;
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 750;
}

.pdf-copy h3 {
  font-size: clamp(2.2rem, 4.4vw, 4.4rem);
}

.pdf-copy > p:not(.pdf-kicker, .note-meta) {
  max-width: 590px;
  color: var(--muted);
}

.note-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.extension-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 22px;
  align-content: center;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.36), rgba(255, 255, 255, 0.1)),
    repeating-linear-gradient(135deg, transparent 0 18px, rgba(255, 255, 255, 0.12) 18px 19px);
}

.extension-card h3 {
  margin: 10px 0 12px !important;
}

.extension-card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.extension-plus {
  display: inline-grid;
  width: 50px;
  height: 50px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.28);
  color: var(--accent-strong);
  box-shadow: inset 0 1px 0 white, 0 8px 18px rgba(57, 73, 130, 0.12);
  font-size: 1.45rem;
  font-weight: 400;
}

.note-card > p:not(.note-meta) {
  max-width: 610px;
  color: var(--muted);
}

.note-meta {
  margin: 24px 0 0;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 700;
}

.musing-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 20px;
}

.musing-card {
  padding: clamp(28px, 4vw, 48px);
  border-radius: var(--radius-md);
}

.musing-lead {
  min-height: 580px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.musing-lead blockquote {
  max-width: 720px;
  margin-bottom: 34px;
  font-size: clamp(2rem, 4.2vw, 3.8rem);
  font-weight: 720;
  line-height: 1.24;
  letter-spacing: -0.045em;
}

.musing-lead > p:last-child {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--muted);
}

.musing-index {
  margin-bottom: 30px;
}

.musing-stack {
  display: grid;
  gap: 20px;
}

.musing-stack .musing-card {
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  box-shadow: var(--shadow-soft);
}

.musing-stack h3 {
  margin-bottom: 12px;
  font-size: 1.45rem;
  letter-spacing: -0.025em;
}

.musing-stack .musing-card > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.expansion-strip {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 20px;
  align-items: center;
  margin-top: 20px;
  padding: 26px 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.expansion-strip strong {
  display: block;
  margin-bottom: 5px;
  font-size: 1rem;
}

.expansion-strip p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.about {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: clamp(50px, 9vw, 120px);
  margin-block: 70px 110px;
  padding: clamp(34px, 6vw, 72px);
  border-radius: var(--radius-lg);
}

.about h2 {
  font-size: clamp(2.3rem, 4vw, 3.8rem);
}

.about-copy {
  color: var(--muted);
  font-size: 1rem;
}

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

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  padding: 17px 22px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.78rem;
  box-shadow: var(--shadow-soft);
}

.site-footer p {
  margin: 0;
}

.error-page {
  width: min(680px, calc(100% - 30px));
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin-inline: auto;
  padding-block: 40px;
}

.error-card {
  width: 100%;
  padding: clamp(38px, 8vw, 76px);
  border-radius: var(--radius-lg);
}

.error-code {
  margin-bottom: 34px;
  color: var(--accent-strong);
  font: 780 clamp(4rem, 13vw, 7.5rem)/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: -0.08em;
}

.error-card h1 {
  margin-bottom: 18px;
  font-size: clamp(2.4rem, 7vw, 4.5rem);
}

.error-card > p:not(.error-code, .eyebrow) {
  margin-bottom: 30px;
  color: var(--muted);
}

:focus-visible {
  outline: 3px solid rgba(49, 95, 223, 0.38);
  outline-offset: 3px;
}

@supports not ((-webkit-backdrop-filter: blur(2px)) or (backdrop-filter: blur(2px))) {
  .glass-panel,
  .glass-card,
  .glass-bar {
    background: rgba(250, 252, 255, 0.94);
  }
}

@media (max-width: 860px) {
  .hero {
    padding-top: 54px;
  }

  .hero-panel,
  .section-heading,
  .musing-layout,
  .about {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    gap: 44px;
  }

  .now-card {
    max-width: 540px;
  }

  .section-heading {
    gap: 16px;
  }

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

  .note-card.featured {
    grid-column: auto;
    min-height: 500px;
  }

  .pdf-note {
    grid-template-columns: 1fr;
  }

  .pdf-preview {
    width: min(100%, 320px);
  }

  .musing-lead {
    min-height: 500px;
  }
}

@media (max-width: 580px) {
  :root {
    --page: calc(100% - 24px);
    --radius-lg: 25px;
    --radius-md: 21px;
    --blur: blur(22px) saturate(165%);
  }

  .site-header {
    position: relative;
    top: auto;
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
  }

  nav {
    width: 100%;
    justify-content: space-between;
    gap: 0;
  }

  nav a {
    padding: 7px 8px;
    font-size: 0.8rem;
  }

  .hero {
    min-height: auto;
    padding-block: 26px 72px;
  }

  .hero-panel {
    min-height: auto;
    padding: 28px 22px;
  }

  h1 {
    font-size: clamp(2.55rem, 13.8vw, 4rem);
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .now-card,
  .note-card,
  .musing-card {
    padding: 24px;
  }

  .pdf-note {
    padding: 24px;
  }

  .pdf-copy .card-topline {
    margin-bottom: 42px;
  }

  .note-actions {
    flex-direction: column;
  }

  .section {
    padding-block: 82px;
  }

  .section-heading {
    margin-bottom: 30px;
  }

  .section-heading > p {
    font-size: 0.94rem;
  }

  .note-card,
  .note-card.featured {
    min-height: 380px;
  }

  .note-card:not(.featured) h3 {
    margin-top: 52px;
  }

  .musing-lead {
    min-height: 440px;
  }

  .musing-lead blockquote {
    font-size: clamp(1.8rem, 9.5vw, 2.7rem);
  }

  .expansion-strip {
    grid-template-columns: 42px 1fr;
    padding: 22px;
  }

  .expansion-strip .extension-plus {
    width: 42px;
    height: 42px;
  }

  .about {
    margin-block: 36px 72px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
    border-radius: var(--radius-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button {
    transition: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --ink: #f1f5ff;
    --muted: #adb8cc;
    --accent: #8ba9ff;
    --accent-strong: #a8bbff;
    --glass: rgba(25, 33, 53, 0.6);
    --glass-strong: rgba(30, 38, 61, 0.72);
    --glass-border: rgba(255, 255, 255, 0.16);
    --line: rgba(210, 221, 255, 0.14);
    --shadow: 0 26px 76px rgba(0, 0, 0, 0.34), inset 0 1px 0 rgba(255, 255, 255, 0.12);
    --shadow-soft: 0 14px 42px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }

  body {
    background:
      radial-gradient(circle at 50% -10%, rgba(47, 61, 94, 0.82) 0, rgba(18, 24, 40, 0.85) 38%, transparent 66%),
      linear-gradient(145deg, #111827 0%, #1b1730 48%, #102724 100%);
  }

  .glass-panel,
  .glass-card,
  .glass-bar {
    background: linear-gradient(145deg, rgba(38, 48, 75, 0.66), rgba(22, 29, 49, 0.38));
  }

  .note-card.featured {
    background:
      radial-gradient(circle at 18% 20%, rgba(76, 124, 218, 0.38), transparent 40%),
      radial-gradient(circle at 85% 84%, rgba(156, 76, 218, 0.25), transparent 42%),
      linear-gradient(145deg, rgba(38, 48, 75, 0.66), rgba(25, 31, 54, 0.4));
  }

  .pdf-preview {
    background: rgba(255, 255, 255, 0.12);
  }

  nav a:hover,
  nav a:focus-visible,
  .glass-button {
    background: rgba(255, 255, 255, 0.1);
  }

  .glass-button:hover,
  .glass-button:focus-visible {
    background: rgba(255, 255, 255, 0.16);
  }
}