/* adityan.dev — design tokens and site styles. Light theme via
   html[data-theme="light"]. */

:root {
  /* surfaces and text */
  --bg: #0a0a0a;
  --bg-raised: #111111;
  --text-1: #ededed;
  --text-2: #a1a1a1;
  --text-3: #707070;
  --border: #262626;
  --border-strong: #404040;
  --focus: #3b91ff;
  --btn-solid-bg: #ededed;
  --btn-solid-fg: #0a0a0a;
  --btn-solid-hover-bg: #ffffff;

  /* type families */
  --font-sans: 'Geist', -apple-system, 'Segoe UI', 'Helvetica Neue', sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* type roles */
  --type-display: clamp(44px, 7vw, 76px);
  --type-page-title: clamp(34px, 5vw, 52px);
  --type-title: clamp(26px, 4vw, 38px);
  --type-section: clamp(22px, 3vw, 28px);
  --type-subsection: 20px;
  --type-heading: 17px;
  --type-lede: 18px;
  --type-body: 16px;
  --type-compact: 18px;
  --type-label: 13px;
  --type-metadata: 12px;

  /* weight and leading */
  --weight-medium: 500;
  --weight-heading: 600;
  --leading-body: 1.6;
  --leading-compact: 1.5;
  --leading-title: 1.15;
  --leading-display: 1.05;

  /* rhythm */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-chapter: 88px;

  --image-outline: oklch(1 0 0 / 0.1);

  --radius-sm: 6px;
  --radius: 8px;
  --container: 1040px;
  --measure: 66ch;
}

html[data-theme='light'] {
  --bg: #fafafa;
  --bg-raised: #ffffff;
  --text-1: #171717;
  --text-2: #666666;
  --text-3: #8f8f8f;
  --border: #eaeaea;
  --border-strong: #d4d4d4;
  --focus: #0069de;
  --btn-solid-bg: #171717;
  --btn-solid-fg: #ffffff;
  --btn-solid-hover-bg: #383838;
  --image-outline: oklch(0 0 0 / 0.1);
}

/* ---------- base ---------- */

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

html[data-theme='light'] {
  color-scheme: light;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

::selection {
  background: var(--focus);
  color: #fff;
}

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

main.container {
  padding-top: var(--space-16);
}

section {
  margin: var(--space-chapter) 0;
}

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

/* ---------- typography ---------- */

h1,
h2,
h3 {
  font-weight: var(--weight-heading);
  line-height: var(--leading-title);
  letter-spacing: -0.03em;
  margin: 0;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

.section-title {
  font-size: var(--type-section);
  letter-spacing: -0.02em;
}

.lede {
  color: var(--text-2);
  font-size: var(--type-lede);
  max-width: 58ch;
  margin: var(--space-4) 0 0;
}

.lede a,
.section-head p a,
.prose a {
  color: var(--text-1);
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}

.lede a:hover,
.section-head p a:hover,
.prose a:hover {
  text-decoration-color: var(--text-1);
}

/* ---------- nav ---------- */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 64px;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.brand {
  font-weight: var(--weight-heading);
  font-size: var(--type-compact);
  letter-spacing: -0.01em;
  color: var(--text-1);
  text-decoration: none;
  white-space: nowrap;
}

.brand .tld {
  color: var(--text-3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.nav-links a {
  position: relative;
  font-size: var(--type-compact);
  color: var(--text-2);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease;
}

/* Taller hit target, without widening into the neighbouring link. */
.nav-links a::after {
  content: '';
  position: absolute;
  inset: -8px 0;
}

.nav-links a:hover,
.nav-links a[aria-current='page'] {
  color: var(--text-1);
}

.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-left: var(--space-1);
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  transition: color 0.15s ease, scale 0.15s ease;
}

.theme-toggle:hover {
  color: var(--text-1);
}

.theme-toggle:active {
  scale: 0.96;
}

/* 32px control, 40px target. */
.theme-toggle::after {
  content: '';
  position: absolute;
  inset: -4px;
}

/* Both icons stay in the DOM and cross-fade in place. */
.theme-toggle svg {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 16px;
  height: 16px;
  /* 2.25 on a 24 viewBox renders 1.5px at 16px, matching the nav text. */
  stroke-width: 2.25;
  transition-property: opacity, scale, filter;
  transition-duration: 0.3s;
  transition-timing-function: cubic-bezier(0.2, 0, 0, 1);
}

.theme-toggle .icon-moon,
html[data-theme='light'] .theme-toggle .icon-sun {
  opacity: 1;
  scale: 1;
  filter: blur(0px);
}

.theme-toggle .icon-sun,
html[data-theme='light'] .theme-toggle .icon-moon {
  opacity: 0;
  scale: 0.25;
  filter: blur(4px);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--type-compact);
  font-weight: var(--weight-medium);
  line-height: 1;
  text-decoration: none;
  padding: 0 var(--space-4);
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease,
    scale 0.15s ease;
}

.btn:active {
  scale: 0.96;
}

.btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  /* 2.5 on a 24 viewBox renders ~1.5px at 14px, matching the label. */
  stroke-width: 2.5;
}

.btn-solid {
  background: var(--btn-solid-bg);
  color: var(--btn-solid-fg);
}

.btn-solid:hover {
  background: var(--btn-solid-hover-bg);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text-1);
  background: transparent;
}

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

/* ---------- hero ---------- */

.hero {
  position: relative;
  padding: var(--space-16) 0 var(--space-1);
}

/* WebGPU contour backdrop, added by script.js when the browser allows it. */
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 600ms ease;
}

.hero-canvas[data-ready] {
  opacity: 1;
}

/* Interior heroes are a short band, so their canvas overhangs into the
   chapter gap that follows and sits behind every layer. */
.page-hero .hero-canvas {
  inset: 0 0 auto;
  height: calc(100% + var(--space-chapter));
  z-index: -1;
}

.hero > *:not(.hero-canvas),
.page-hero > *:not(.hero-canvas) {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: var(--type-display);
  line-height: var(--leading-display);
  letter-spacing: -0.045em;
  margin: 0;
}

.hero .lede {
  margin-top: var(--space-6);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

/* ---------- page hero (interior pages) ---------- */

.page-hero {
  position: relative;
  padding: var(--space-12) 0 0;
  margin-bottom: 0;
}

.page-hero h1 {
  font-size: var(--type-page-title);
  letter-spacing: -0.04em;
}

/* ---------- section header ---------- */

.section-head {
  margin-bottom: var(--space-8);
}

.section-head p {
  color: var(--text-2);
  max-width: var(--measure);
  margin: var(--space-3) 0 0;
}

/* ---------- work list ---------- */

.work-list {
  border-top: 1px solid var(--border);
}

.work-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 240px;
  gap: var(--space-3) var(--space-8);
  align-items: baseline;
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border);
  color: inherit;
  text-decoration: none;
}

.work-item > * {
  min-width: 0;
}

.work-name {
  font-size: var(--type-heading);
  font-weight: var(--weight-heading);
  letter-spacing: -0.01em;
  margin: 0;
}

.work-name a {
  color: inherit;
  text-decoration: none;
}

.work-name a:hover {
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

.work-desc {
  color: var(--text-2);
  font-size: var(--type-compact);
  line-height: var(--leading-compact);
  margin: 0;
}

.work-aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.work-stack {
  font-family: var(--font-mono);
  font-size: var(--type-metadata);
  color: var(--text-3);
  margin: 0;
}

.work-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.work-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--type-label);
  color: var(--text-3);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.work-links a:hover {
  color: var(--text-1);
}

.work-links svg {
  width: 12px;
  height: 12px;
  /* 3 on a 24 viewBox renders 1.5px at 12px, matching the label. */
  stroke-width: 3;
}

/* Whole-row link */
a.work-item:hover .work-name,
a.work-item:focus-visible .work-name {
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

/* ---------- prose ---------- */

.split {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: var(--space-8) var(--space-16);
  align-items: start;
}

.prose p {
  color: var(--text-2);
  margin: 0 0 var(--space-5);
  max-width: var(--measure);
}

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

.prose strong {
  color: var(--text-1);
  font-weight: var(--weight-medium);
}

/* ---------- blog list ---------- */

.post-list {
  border-top: 1px solid var(--border);
}

.post-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: var(--space-1) var(--space-8);
  align-items: baseline;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
}

.post-row > * {
  min-width: 0;
}

.post-row time {
  font-family: var(--font-mono);
  font-size: var(--type-metadata);
  font-variant-numeric: tabular-nums;
  color: var(--text-3);
}

.post-row h3 {
  font-size: var(--type-heading);
  letter-spacing: -0.01em;
}

.post-row:hover h3,
.post-row:focus-visible h3 {
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

.post-row p {
  color: var(--text-2);
  font-size: var(--type-compact);
  line-height: var(--leading-compact);
  margin: var(--space-1) 0 0;
  max-width: var(--measure);
}

/* ---------- article ---------- */

.article {
  max-width: 680px;
  margin: 0 auto;
  padding-top: var(--space-8);
}

.back-link {
  font-family: var(--font-mono);
  font-size: var(--type-label);
  color: var(--text-3);
  text-decoration: none;
  transition: color 0.15s ease;
}

.back-link:hover {
  color: var(--text-1);
}

.article-title {
  font-size: var(--type-title);
  letter-spacing: -0.035em;
  margin: var(--space-4) 0 var(--space-5);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-4);
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--type-metadata);
  font-variant-numeric: tabular-nums;
  color: var(--text-3);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.article-body p,
.article-body li {
  color: var(--text-1);
}

.article-body {
  font-size: var(--type-body);
}

.article-body h1,
.article-body h2,
.article-body h3 {
  letter-spacing: -0.02em;
  margin: var(--space-10) 0 var(--space-3);
}

.article-body h1 { font-size: var(--type-section); }
.article-body h2 { font-size: var(--type-subsection); }
.article-body h3 { font-size: var(--type-heading); }

.article-body ul,
.article-body ol {
  margin: 0 0 var(--space-5);
  padding-left: var(--space-6);
}

.article-body li {
  margin: var(--space-1) 0;
}

.article-body li::marker {
  color: var(--text-3);
}

.article-body img {
  border-radius: var(--radius);
  outline: 1px solid var(--image-outline);
  outline-offset: -1px;
  margin: var(--space-8) 0;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--text-1);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.article-body pre {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  overflow-x: auto;
  margin: var(--space-6) 0;
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: var(--type-label);
  line-height: var(--leading-compact);
}

.article-body blockquote {
  margin: var(--space-6) 0;
  padding: 0 0 0 var(--space-5);
  border-left: 2px solid var(--border-strong);
  color: var(--text-2);
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-10) 0;
}

.article-foot {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

/* ---------- contact ---------- */

.big-link {
  font-family: var(--font-mono);
  font-size: clamp(19px, 4.2vw, 34px);
  font-weight: var(--weight-medium);
  letter-spacing: -0.02em;
  color: var(--text-1);
  text-decoration: none;
  display: inline-block;
  position: relative;
  word-break: break-word;
}

.big-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--text-3);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.big-link:hover::after {
  transform: scaleX(1);
}

/* Width reserved up front so "Copied!" does not shrink the control. */
[data-copy-email] {
  justify-content: center;
  min-width: 140px;
}

[data-hero="contact"] .lede {
  margin-bottom: var(--space-12);
}

.channel-list {
  border-top: 1px solid var(--border);
}

.channel {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-2) var(--space-6);
  width: 100%;
  padding: var(--space-4) 0;
  border: none;
  border-bottom: 1px solid var(--border);
  background: none;
  font-family: var(--font-sans);
  font-size: var(--type-compact);
  text-align: left;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.channel .ch-label {
  font-family: var(--font-mono);
  font-size: var(--type-metadata);
  color: var(--text-3);
}

.channel .ch-value {
  color: var(--text-1);
  min-width: 0;
}

.channel:hover .ch-value {
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

/* ---------- closing block ---------- */

.closing {
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
}

.closing h2 {
  font-size: var(--type-section);
  letter-spacing: -0.02em;
}

.closing p {
  color: var(--text-2);
  margin: var(--space-3) 0 var(--space-6);
  max-width: 52ch;
}

/* ---------- footer ---------- */

.site-footer {
  margin-top: var(--space-chapter);
  border-top: 1px solid var(--border);
  padding: var(--space-10) 0 var(--space-12);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-6);
}

.footer-name {
  font-size: var(--type-compact);
  font-weight: var(--weight-medium);
  margin: 0 0 var(--space-1);
}

.socials {
  display: flex;
  gap: var(--space-2);
}

.socials a {
  position: relative;
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-3);
  transition: color 0.15s ease;
}

.socials a:hover {
  color: var(--text-1);
}

/* 32px control, 40px target. */
.socials a::after {
  content: '';
  position: absolute;
  inset: -4px;
}

.socials svg {
  width: 17px;
  height: 17px;
}

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--type-metadata);
  font-variant-numeric: tabular-nums;
  color: var(--text-3);
}

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

.footer-bottom a:hover {
  color: var(--text-1);
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .split {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .work-item {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-2);
  }

  .work-aside {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-2) var(--space-4);
  }

  .post-row,
  .channel {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
  }
}

@media (max-width: 640px) {
  main.container {
    padding-top: var(--space-12);
  }

  section {
    margin: var(--space-16) 0;
  }

  .hero {
    padding: var(--space-10) 0 var(--space-8);
  }

  .nav-inner {
    height: 56px;
    padding: 0 var(--space-4);
    gap: var(--space-3);
  }

  .container {
    padding: 0 var(--space-4);
  }
}

@media (max-width: 400px) {
  .nav-inner {
    padding: 0 var(--space-3);
    gap: var(--space-2);
  }

  .nav-links a {
    padding: var(--space-1) var(--space-1);
  }

  .brand .tld {
    display: none;
  }
}

/* ---------- reduced motion ---------- */

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---------- focus states ---------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}