/* ============================================================
   Tium Notes
   Anthropic warmth x OpenAI restraint.
   ============================================================ */

:root {
  color-scheme: light;
  --bg: #f7f2e8;
  --bg-elevated: #fbf8f1;
  --surface: rgba(255, 252, 245, 0.78);
  --surface-strong: #fffaf0;
  --text: #171613;
  --text-soft: #3b3832;
  --muted: #706a60;
  --muted-soft: #9a9285;
  --line: rgba(31, 28, 22, 0.12);
  --line-strong: rgba(31, 28, 22, 0.22);
  --accent: #c85f3b;
  --accent-deep: #863a25;
  --accent-soft: rgba(200, 95, 59, 0.13);
  --green: #346b50;
  --code-bg: rgba(23, 22, 19, 0.06);
  --code-block-bg: #171613;
  --code-block-text: #f5efe3;
  --selection-bg: rgba(200, 95, 59, 0.24);
  --shadow: 0 24px 70px rgba(50, 42, 30, 0.13);
  --shadow-soft: 0 1px 2px rgba(31, 28, 22, 0.05);
  --header-bg: rgba(247, 242, 232, 0.78);
  --content: 1180px;
  --narrow: 740px;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --font-serif: "Iowan Old Style", "Charter", "Source Serif Pro", "Songti SC", "Noto Serif SC", Georgia, serif;
  --font-sans: "Aptos", "SF Pro Text", "Segoe UI", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --fast: 150ms;
  --normal: 260ms;
  --slow: 520ms;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10100e;
  --bg-elevated: #171713;
  --surface: rgba(26, 26, 22, 0.78);
  --surface-strong: #1c1b17;
  --text: #f2ede3;
  --text-soft: #d5ccbd;
  --muted: #9d9486;
  --muted-soft: #6f675d;
  --line: rgba(242, 237, 227, 0.12);
  --line-strong: rgba(242, 237, 227, 0.22);
  --accent: #df7b57;
  --accent-deep: #f1a07e;
  --accent-soft: rgba(223, 123, 87, 0.16);
  --green: #8ac7a8;
  --code-bg: rgba(242, 237, 227, 0.08);
  --code-block-bg: #090908;
  --code-block-text: #f2ede3;
  --selection-bg: rgba(223, 123, 87, 0.32);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.28);
  --header-bg: rgba(16, 16, 14, 0.76);
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 8%, rgba(200, 95, 59, 0.16), transparent 26rem),
    radial-gradient(circle at 86% 18%, rgba(52, 107, 80, 0.11), transparent 30rem),
    linear-gradient(180deg, var(--bg-elevated), var(--bg) 18rem);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.45;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 70%);
}

body.nav-lock,
body.search-lock {
  overflow: hidden;
}

::selection {
  background: var(--selection-bg);
}

a {
  color: inherit;
  text-decoration: none;
}

p {
  margin: 0;
}

img,
svg {
  display: block;
}

img {
  max-width: 100%;
}

button,
input {
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border: 3px solid transparent;
  border-radius: var(--radius-pill);
  background-clip: content-box;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 500;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: var(--surface-strong);
  color: var(--text);
  transform: translateY(-140%);
  transition: transform var(--normal) var(--ease);
}

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

.reading-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 300;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--green));
}

.site-shell {
  width: min(calc(100% - 2.5rem), var(--content));
  min-height: 100vh;
  margin: 0 auto;
  padding-bottom: 4rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 calc(-1 * max(0px, (100vw - var(--content)) / 2));
  padding: 0.9rem clamp(1rem, 4vw, 2.25rem);
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(18px) saturate(1.25);
  -webkit-backdrop-filter: blur(18px) saturate(1.25);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: max-content;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.brand::before {
  content: "";
  width: 1.1rem;
  height: 1.1rem;
  border: 1px solid var(--text);
  border-radius: 50%;
  background:
    linear-gradient(90deg, transparent 47%, currentColor 47% 53%, transparent 53%),
    linear-gradient(0deg, transparent 47%, currentColor 47% 53%, transparent 53%);
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-right: 0.35rem;
  padding: 0.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--surface) 76%, transparent);
}

nav a {
  padding: 0.42rem 0.76rem;
  border-radius: var(--radius-pill);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1;
  letter-spacing: 0.02em;
  transition: color var(--fast), background var(--fast);
}

nav a:hover,
nav a.active {
  color: var(--text);
  background: var(--surface-strong);
}

.theme-toggle,
.search-trigger,
.hamburger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition:
    border-color var(--fast),
    color var(--fast),
    background var(--fast),
    transform var(--fast) var(--ease);
}

.theme-toggle:hover,
.search-trigger:hover,
.hamburger:hover {
  border-color: var(--line-strong);
  background: var(--surface-strong);
  color: var(--text);
}

.theme-toggle:active,
.search-trigger:active,
.hamburger:active {
  transform: translateY(1px);
}

.theme-toggle svg,
.search-trigger svg {
  width: 1rem;
  height: 1rem;
}

.theme-toggle .icon-moon,
[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

.hamburger {
  display: none;
}

.hamburger span,
.hamburger span::before,
.hamburger span::after {
  width: 1rem;
  height: 1.5px;
  border-radius: var(--radius-pill);
  background: currentColor;
  transition: transform var(--fast) var(--ease), opacity var(--fast);
}

.hamburger span {
  position: relative;
}

.hamburger span::before,
.hamburger span::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger span::before {
  top: -5px;
}

.hamburger span::after {
  top: 5px;
}

.hamburger.open span {
  background: transparent;
}

.hamburger.open span::before {
  transform: translateY(5px) rotate(45deg);
}

.hamburger.open span::after {
  transform: translateY(-5px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: 2rem;
  background:
    radial-gradient(circle at 50% 20%, var(--accent-soft), transparent 20rem),
    var(--bg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--normal) var(--ease);
}

.mobile-nav.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav a {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 10vw, 4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

main {
  animation: pageEnter var(--slow) var(--ease);
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 1.7rem;
  height: 1px;
  background: var(--accent);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.46fr);
  gap: clamp(2.25rem, 7vw, 5.5rem);
  align-items: end;
  padding: clamp(5rem, 12vw, 10rem) 0 clamp(3.5rem, 8vw, 6rem);
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  max-width: 49rem;
}

.hero h1,
.page-intro h1,
.article-header h1 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: clamp(3.4rem, 8.2vw, 7.6rem);
  font-weight: 520;
  line-height: 0.94;
  letter-spacing: -0.07em;
}

.hero-text,
.page-intro p,
.article-summary {
  max-width: 41rem;
  margin-top: 1.45rem;
  color: var(--text-soft);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  line-height: 1.72;
}

.hero-actions,
.article-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 2.6rem;
  padding: 0.66rem 1.05rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--surface) 84%, transparent);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 620;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition:
    transform var(--fast) var(--ease),
    background var(--fast),
    color var(--fast),
    border-color var(--fast);
}

.button svg {
  width: 1rem;
  height: 1rem;
}

.button:hover {
  border-color: var(--text);
  background: var(--surface-strong);
  transform: translateY(-1px);
}

.button-primary {
  border-color: var(--text);
  background: var(--text);
  color: var(--bg);
}

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

.hero-card {
  position: relative;
  padding: clamp(1.35rem, 3vw, 1.75rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at 118% 116%, var(--accent-soft), transparent 58%),
    radial-gradient(circle at -10% -8%, color-mix(in srgb, var(--green) 12%, transparent), transparent 42%),
    var(--surface-strong);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(1.35rem, 3vw, 1.75rem);
  width: 2rem;
  height: 1px;
  background: var(--accent);
  pointer-events: none;
  z-index: 1;
}

.card-label {
  position: relative;
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-card h2 {
  position: relative;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 520;
  line-height: 1;
  letter-spacing: -0.035em;
}

.hero-card > p {
  position: relative;
  margin-top: 0.8rem;
  color: var(--text-soft);
}

.signal-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 1.35rem -0.25rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
  overflow: hidden;
}

.signal-grid span {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0.7rem;
  background: color-mix(in srgb, var(--surface-strong) 88%, transparent);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.15;
  text-transform: uppercase;
}

.signal-grid strong {
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 520;
  letter-spacing: -0.025em;
  text-transform: none;
}

.meta-list {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.meta-list li {
  padding: 0.35rem 0.58rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--muted);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.section-block {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  border-bottom: 1px solid var(--line);
}

.section-block:last-of-type {
  border-bottom: 0;
}

.section-split {
  display: grid;
  grid-template-columns: minmax(16rem, 0.38fr) 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.section-title,
.section-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.8vw, 3.5rem);
  font-weight: 520;
  line-height: 1;
  letter-spacing: -0.045em;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}

.principle-grid article {
  min-height: 15rem;
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  background:
    linear-gradient(180deg, transparent, color-mix(in srgb, var(--surface-strong) 45%, transparent)),
    color-mix(in srgb, var(--surface) 80%, transparent);
}

.principle-grid article:last-child {
  border-right: 0;
}

.principle-grid span {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.principle-grid h3 {
  margin: 4.5rem 0 0.65rem;
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 520;
  letter-spacing: -0.025em;
}

.principle-grid p {
  color: var(--muted);
  font-size: 0.95rem;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.7rem;
}

.section-head-left {
  display: grid;
  gap: 0.15rem;
}

.more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 650;
  transition: color var(--fast);
}

.more svg {
  width: 1rem;
  height: 1rem;
}

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

.entry-list {
  display: grid;
  border-top: 1px solid var(--line);
}

.entry-row {
  display: grid;
  grid-template-columns: 8.2rem minmax(0, 1fr) minmax(9rem, auto);
  gap: clamp(1rem, 4vw, 2.6rem);
  align-items: start;
  padding: 1.45rem 0;
  border-bottom: 1px solid var(--line);
  transition: padding var(--normal) var(--ease), color var(--fast);
}

.entry-row:hover {
  padding-left: 0.65rem;
}

.entry-row:hover .entry-title {
  color: var(--accent);
}

.entry-meta {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.entry-status {
  color: var(--muted-soft);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.entry-body {
  display: grid;
  gap: 0.45rem;
  min-width: 0;
}

.entry-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 2.8vw, 2rem);
  font-weight: 520;
  line-height: 1.12;
  letter-spacing: -0.035em;
  transition: color var(--fast);
}

.entry-summary {
  max-width: 44rem;
  color: var(--muted);
  font-size: 0.97rem;
  line-height: 1.62;
}

.entry-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.42rem;
  max-width: 18rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1;
  transition: color var(--fast), border-color var(--fast);
}

a.tag:hover {
  color: var(--text);
  border-color: var(--text);
}

.entry-empty {
  padding: 2rem 0;
  color: var(--muted);
  font-family: var(--font-mono);
}

.page-intro {
  padding: clamp(4rem, 9vw, 7rem) 0 clamp(2.5rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}

.page-intro h1 {
  font-size: clamp(3.2rem, 10vw, 8rem);
}

.collection-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.7rem;
}

.collection-meta span {
  padding: 0.34rem 0.62rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.article-shell {
  padding: clamp(3rem, 7vw, 5.5rem) 0 0;
}

.article-header {
  max-width: var(--narrow);
  padding-bottom: 2rem;
}

.article-header h1 {
  font-size: clamp(2.7rem, 6.4vw, 5.1rem);
}

.back-link {
  display: inline-flex;
  margin-bottom: 2rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 650;
}

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

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  margin-top: 1.5rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.reading-time svg {
  width: 0.9rem;
  height: 0.9rem;
}

.entry-cover-article {
  position: relative;
  min-height: clamp(14rem, 38vw, 28rem);
  margin: 1rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
}

.entry-cover-article img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.entry-cover-placeholder {
  display: flex;
  align-items: flex-end;
  padding: clamp(1.2rem, 4vw, 2rem);
  background:
    radial-gradient(circle at 18% 20%, var(--accent-soft), transparent 18rem),
    radial-gradient(circle at 86% 0%, color-mix(in srgb, var(--green) 16%, transparent), transparent 20rem),
    var(--surface);
}

.entry-cover-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to top, black, transparent 75%);
}

.entry-cover-placeholder span {
  position: relative;
  max-width: 42rem;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 520;
  line-height: 1;
  letter-spacing: -0.05em;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--narrow)) minmax(12rem, 14rem);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
  padding: clamp(2.4rem, 5vw, 3.8rem) 0 0;
}

.article-layout .article-body {
  padding-top: 0;
}

.article-toc {
  position: sticky;
  top: 5.5rem;
  display: grid;
  gap: 0.6rem;
  padding: 1rem 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  max-height: calc(100vh - 7rem);
  overflow: auto;
}

.toc-label {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-toc ol {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-toc a {
  color: var(--muted);
  line-height: 1.4;
  transition: color var(--fast);
}

.article-toc a:hover,
.article-toc li.active a {
  color: var(--text);
}

.article-toc .toc-l3 {
  padding-left: 0.85rem;
  font-size: 0.8rem;
}

.article-body {
  max-width: var(--narrow);
  padding: clamp(2.4rem, 5vw, 3.8rem) 0 0;
  color: var(--text-soft);
  font-family: var(--font-serif);
  font-size: clamp(1.08rem, 2vw, 1.2rem);
  line-height: 1.82;
  transition: font-family var(--fast);
}

[data-reading="clean"] .article-body {
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(1.02rem, 1.9vw, 1.12rem);
  line-height: 1.72;
}

[data-reading="clean"] .article-body p {
  letter-spacing: -0.005em;
}

.reading-mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: auto;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  transition: border-color var(--fast), color var(--fast);
}

.reading-mode-toggle:hover {
  border-color: var(--text);
  color: var(--text);
}

.reading-mode-toggle .reading-mode-default { order: 0; }
.reading-mode-toggle .reading-mode-clean { order: 2; }

.reading-mode-toggle .reading-mode-default::after {
  content: " · ";
  color: var(--muted-soft);
  font-weight: 450;
}

.reading-mode-toggle .reading-mode-default {
  color: var(--text);
  font-weight: 650;
}

.reading-mode-toggle .reading-mode-clean {
  color: var(--muted-soft);
  font-weight: 450;
}

[data-reading="clean"] .reading-mode-toggle .reading-mode-default {
  color: var(--muted-soft);
  font-weight: 450;
}

[data-reading="clean"] .reading-mode-toggle .reading-mode-clean {
  color: var(--text);
  font-weight: 650;
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4 {
  position: relative;
  margin: 2.7rem 0 0.85rem;
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 720;
  line-height: 1.18;
  letter-spacing: -0.035em;
  scroll-margin-top: 5rem;
}

.heading-anchor {
  position: absolute;
  top: 0.05em;
  left: -1.1em;
  padding: 0 0.25em;
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--fast), color var(--fast);
}

.article-body h1:hover .heading-anchor,
.article-body h2:hover .heading-anchor,
.article-body h3:hover .heading-anchor,
.article-body h4:hover .heading-anchor,
.heading-anchor:focus-visible {
  opacity: 1;
  color: var(--accent);
}

.article-body h1 {
  font-size: 2rem;
}

.article-body h2 {
  font-size: 1.55rem;
}

.article-body h3 {
  font-size: 1.25rem;
}

.article-body h4 {
  font-size: 1.05rem;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body pre,
.article-body blockquote,
.article-body img {
  margin: 1.05rem 0;
}

.article-body ul,
.article-body ol {
  padding-left: 1.45rem;
}

.article-body li {
  margin: 0.36rem 0;
}

.article-body a {
  color: var(--text);
  text-decoration-line: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.article-body code {
  padding: 0.12rem 0.38rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  background: var(--code-bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.84em;
}

.article-body pre {
  position: relative;
  overflow: auto;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--code-block-bg);
  color: var(--code-block-text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.65;
}

.article-body pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

.copy-code {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  padding: 0.25rem 0.55rem;
  border: 1px solid rgba(245, 239, 227, 0.18);
  border-radius: var(--radius-pill);
  background: rgba(245, 239, 227, 0.08);
  color: rgba(245, 239, 227, 0.78);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--fast), color var(--fast), border-color var(--fast);
}

.article-body pre:hover .copy-code,
.copy-code:focus-visible {
  opacity: 1;
}

.copy-code:hover {
  border-color: rgba(245, 239, 227, 0.4);
  color: rgba(245, 239, 227, 0.98);
}

/* Prism token colors — minimal, OpenAI doc inspired */
.token.comment,
.token.prolog,
.token.cdata { color: #7a7468; font-style: italic; }
.token.punctuation { color: #c2bba9; }
.token.namespace { opacity: 0.7; }
.token.property,
.token.tag,
.token.constant,
.token.symbol,
.token.deleted { color: #df7b57; }
.token.boolean,
.token.number { color: #e0a06d; }
.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted { color: #8ac7a8; }
.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string,
.token.variable { color: #c2bba9; }
.token.atrule,
.token.attr-value,
.token.keyword { color: #f1a07e; }
.token.function,
.token.class-name { color: #f5efe3; font-weight: 600; }
.token.regex,
.token.important { color: #df7b57; }
.token.important,
.token.bold { font-weight: 700; }
.token.italic { font-style: italic; }

.article-body blockquote {
  margin: 1.8rem 0;
  padding: 0.2rem 0 0.2rem 1.2rem;
  border-left: 3px solid var(--accent);
  color: var(--text);
  font-size: 1.22rem;
  font-style: italic;
  line-height: 1.62;
}

.article-body blockquote p {
  margin: 0.5rem 0;
}

.article-body .table-wrap {
  overflow-x: auto;
  margin: 1.4rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-strong) 90%, transparent);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.article-body th,
.article-body td {
  padding: 0.7rem 0.95rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-body th {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}

.article-body tbody tr:last-child td {
  border-bottom: 0;
}

.article-body ul.task-list,
.article-body ol.task-list {
  padding-left: 0.4rem;
  list-style: none;
}

.article-body .task-item {
  display: grid;
  grid-template-columns: 1.2rem 1fr;
  gap: 0.55rem;
  align-items: start;
}

.article-body .task-item input[type="checkbox"] {
  margin-top: 0.55em;
  accent-color: var(--accent);
}

.article-body del {
  color: var(--muted);
  text-decoration-color: var(--muted-soft);
}

.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 3rem 0 0;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.article-nav-cell {
  display: grid;
  gap: 0.35rem;
  padding: 1.05rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  transition: border-color var(--fast), transform var(--fast) var(--ease);
}

.article-nav-empty {
  visibility: hidden;
}

.article-nav-cell:hover {
  border-color: var(--text);
  transform: translateY(-1px);
}

.article-nav-older {
  text-align: right;
}

.article-nav-label {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.article-nav-title {
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 540;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.related-block {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.related-block .eyebrow {
  margin-bottom: 1.2rem;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.related-item {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  transition: border-color var(--fast), transform var(--fast) var(--ease);
}

.related-item:hover {
  border-color: var(--text);
  transform: translateY(-1px);
}

.related-date {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.related-item h4 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 540;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.related-item p {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

@media (max-width: 1100px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-toc {
    position: static;
    max-height: none;
  }

  .related-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .article-nav {
    grid-template-columns: 1fr;
  }

  .article-nav-older {
    text-align: left;
  }
}

.article-body img {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.article-body hr {
  height: 1px;
  margin: 2.4rem 0;
  border: 0;
  background: var(--line);
}

.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 15vh 1rem 1rem;
  background: rgba(16, 16, 14, 0.36);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--normal) var(--ease);
}

.search-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.search-box {
  width: min(42rem, 100%);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  overflow: hidden;
  transform: translateY(-0.6rem) scale(0.98);
  transition: transform var(--normal) var(--ease);
}

.search-overlay.open .search-box {
  transform: translateY(0) scale(1);
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line);
}

.search-input-wrap svg {
  width: 1.1rem;
  height: 1.1rem;
  color: var(--muted);
  flex: 0 0 auto;
}

.search-input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
}

.search-input::placeholder {
  color: var(--muted-soft);
}

.search-results {
  max-height: 26rem;
  padding: 0.5rem;
  overflow: auto;
}

.search-result-item {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: background var(--fast);
}

.search-result-item:hover,
.search-result-item.active {
  background: var(--bg);
}

.search-result-item span {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.search-result-item h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 540;
  letter-spacing: -0.02em;
}

.search-result-item p {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.search-result-item mark,
.search-result-item h4 mark {
  padding: 0 0.15em;
  border-radius: 3px;
  background: var(--accent-soft);
  color: var(--text);
}

.search-empty {
  padding: 2.8rem 1rem;
  color: var(--muted);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.search-hint {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted-soft);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.35rem;
  min-height: 1.25rem;
  padding: 0 0.32rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.back-to-top {
  position: fixed;
  right: 1.3rem;
  bottom: 1.3rem;
  z-index: 130;
  display: grid;
  place-items: center;
  width: 2.45rem;
  height: 2.45rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--surface-strong);
  color: var(--muted);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition:
    opacity var(--normal) var(--ease),
    transform var(--normal) var(--ease),
    color var(--fast),
    border-color var(--fast);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--text);
  color: var(--text);
}

.back-to-top svg {
  width: 1rem;
  height: 1rem;
}

.site-footer {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.footer-muted {
  margin-top: 0.25rem;
  color: var(--muted-soft);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 0.9rem;
}

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

.not-found {
  display: grid;
  place-items: center;
  min-height: 64vh;
  padding: clamp(4rem, 10vw, 7rem) 1rem;
  text-align: center;
}

.not-found h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(6rem, 18vw, 12rem);
  font-weight: 520;
  line-height: 0.85;
  letter-spacing: -0.08em;
}

.not-found p:not(.eyebrow) {
  max-width: 28rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.not-found .button {
  margin-top: 1rem;
}

.not-found-recent {
  margin-top: 3rem;
  width: min(28rem, 100%);
  text-align: left;
}

.not-found-recent ul {
  display: grid;
  gap: 0.45rem;
  margin: 0.6rem 0 0;
  padding: 0;
  list-style: none;
}

.not-found-recent a {
  display: block;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.02rem;
  transition: border-color var(--fast);
}

.not-found-recent a:hover {
  border-color: var(--text);
}

.tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: 0.7rem;
}

.tag-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  transition: border-color var(--fast), transform var(--fast) var(--ease);
}

.tag-card:hover {
  border-color: var(--text);
  transform: translateY(-1px);
}

.tag-card-name {
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 540;
  letter-spacing: -0.02em;
}

.tag-card-count {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* Scroll reveal — only hides content when JS is on and motion is allowed,
   so no-JS and reduced-motion visitors always see everything. */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity var(--slow) var(--ease), transform var(--slow) var(--ease);
    will-change: opacity, transform;
  }

  .js .reveal.in {
    opacity: 1;
    transform: none;
  }
}

/* Archive timeline */
.archive-year {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: clamp(1rem, 5vw, 3rem);
  padding: clamp(1.6rem, 3.5vw, 2.6rem) 0;
  border-top: 1px solid var(--line);
}

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

.archive-year-head {
  position: sticky;
  top: 5.5rem;
  align-self: start;
  display: grid;
  gap: 0.3rem;
  height: max-content;
}

.archive-year-num {
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  font-weight: 520;
  line-height: 1;
  letter-spacing: -0.04em;
}

.archive-year-count {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.archive-items {
  display: grid;
}

.archive-item {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
  transition: padding var(--normal) var(--ease);
}

.archive-item:hover {
  padding-left: 0.6rem;
}

.archive-item:hover .archive-title {
  color: var(--accent);
}

.archive-date {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.archive-title {
  min-width: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 520;
  line-height: 1.3;
  letter-spacing: -0.025em;
  transition: color var(--fast);
}

.archive-kind {
  color: var(--muted-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  white-space: nowrap;
}

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

@media (max-width: 980px) {
  .hero,
  .section-split {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 38rem;
  }

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

  .principle-grid article {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .principle-grid article:last-child {
    border-bottom: 0;
  }

  .principle-grid h3 {
    margin-top: 2rem;
  }

  .entry-row {
    grid-template-columns: 7.5rem minmax(0, 1fr);
  }

  .entry-tags {
    grid-column: 2;
    justify-content: flex-start;
    max-width: none;
  }
}

@media (max-width: 700px) {
  .site-shell {
    width: min(calc(100% - 1.35rem), var(--content));
    padding-bottom: 2.5rem;
  }

  .site-header {
    padding: 0.75rem 0.8rem;
  }

  nav {
    display: none;
  }

  .hamburger {
    display: inline-flex;
  }

  .hero {
    padding-top: 3.4rem;
  }

  .hero h1,
  .page-intro h1 {
    letter-spacing: -0.055em;
  }

  .hero-actions,
  .article-links {
    width: 100%;
  }

  .button {
    flex: 1;
  }

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

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .entry-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.25rem 0;
  }

  .entry-row:hover {
    padding-left: 0;
  }

  .entry-meta {
    display: flex;
    gap: 0.75rem;
  }

  .entry-tags {
    grid-column: auto;
  }

  .page-intro {
    padding-top: 3.4rem;
  }

  .article-shell {
    padding-top: 3rem;
  }

  .article-body {
    font-size: 1.05rem;
  }

  .search-overlay {
    padding-top: 5rem;
  }

  .site-footer {
    align-items: start;
    flex-direction: column;
  }

  .footer-links {
    justify-content: flex-start;
  }

  .archive-year {
    grid-template-columns: 1fr;
    gap: 0.85rem;
    padding: 1.4rem 0;
  }

  .archive-year-head {
    position: static;
    display: flex;
    align-items: baseline;
    gap: 0.7rem;
  }

  .archive-item {
    grid-template-columns: 5rem minmax(0, 1fr);
    gap: 0.7rem;
  }

  .archive-item:hover {
    padding-left: 0;
  }

  .archive-kind {
    display: none;
  }
}