/* ==== Tokens ==== */

/* Primitives: raw values, named for what they are.
   Colors are used through the semantic tokens below; the other scales are used directly. */
:root {
  /* Colors */
  --gray-0: #ffffff;
  --gray-50: #ededed;
  --gray-100: #e5e5e5;
  --gray-300: #b4b4b4;
  --gray-400: #949494;
  --gray-600: #666666;
  --gray-700: #525252;
  --gray-850: #2a2a2a;
  --gray-900: #111111;
  --gray-950: #0a0a0a;

  --blue-200: #bfdbfe;
  --blue-400: #7cb4ff;
  --blue-700: #1d4ed8;
  --blue-900: #1e3a8a;

  /* Spacing: 4px scale, --space-N = N × 4px */
  --space-1: 4px;
  --space-1-5: 6px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-9: 36px;
  --space-18: 72px;
  --space-20: 80px;
  --space-24: 96px;

  /* Type sizes */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 24px;
  --text-display: 52px;

  /* Type: families, weights, line heights (leading), letter spacing (tracking) */
  --font-sans: "Geist", system-ui, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, monospace;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;

  --leading-tight: 1.1;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;

  --tracking-tight: -0.03em;
  --tracking-snug: -0.01em;
  --tracking-wide: 0.16em;

  /* Radius */
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 999px;

  /* Border */
  --border-width: 1px;

  /* Motion */
  --duration-fast: 200ms;
}

/* Semantic colors: named for their role. Components use these, not the color primitives.
   Light is the default; the two blocks below re-point them for dark. */
:root {
  --page-bg: var(--gray-0);
  --card-surface: var(--gray-0);

  --text: var(--gray-950);
  --text-muted: var(--gray-700);
  --text-subtle: var(--gray-600);

  --border: var(--gray-100);
  --button-pressed-bg: var(--gray-50);

  --accent: var(--blue-700);
  --accent-border: var(--blue-200);

  color-scheme: light;
}

/* Dark: when the OS is dark (unless the user picked light), or when the user picked dark. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --page-bg: var(--gray-950);
    --card-surface: var(--gray-900);

    --text: var(--gray-50);
    --text-muted: var(--gray-300);
    --text-subtle: var(--gray-400);

    --border: var(--gray-850);
    --button-pressed-bg: var(--gray-850);

    --accent: var(--blue-400);
    --accent-border: var(--blue-900);

    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --page-bg: var(--gray-950);
  --card-surface: var(--gray-900);

  --text: var(--gray-50);
  --text-muted: var(--gray-300);
  --text-subtle: var(--gray-400);

  --border: var(--gray-850);
  --button-pressed-bg: var(--gray-850);

  --accent: var(--blue-400);
  --accent-border: var(--blue-900);

  color-scheme: dark;
}

/* ==== Base ==== */

/* Smooth-scroll to in-page links, unless the user asked for reduced motion. */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

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

body {
  margin: 0;
  background-color: var(--page-bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  transition:
    background-color var(--duration-fast),
    color var(--duration-fast);
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  margin: 0;
}

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

svg {
  display: block;
}

button {
  font: inherit;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ==== Utilities ==== */

/* Page-width wrapper: centered, with the site's side margins. */
.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-24);
  }
}

/* Hidden visually, still read by screen readers. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.flex-row {
  display: flex;
  flex-direction: row;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

/* ==== Header ==== */

header {
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.name {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-snug);
  color: var(--text);
  text-decoration: none;
}

.header-right {
  align-items: center;
  gap: var(--space-8);
}

.nav-list {
  align-items: center;
  gap: var(--space-8);
}

.nav-links {
  color: var(--text);
  text-decoration: none;
  font-size: var(--text-sm);
}

.theme-pill {
  display: flex;
  border: var(--border-width) solid var(--border);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
  background-color: var(--page-bg);
}
.theme-button {
  background: none;
  border: none;
  width: 38px;
  height: 38px;
  color: var(--text-subtle);
  border-radius: var(--radius-full);
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-button[aria-pressed="true"] {
  background: var(--button-pressed-bg);
  color: var(--text);
}

/* ==== Hero ==== */
/* Room at the end of the page (where the footer will go). */
main {
  padding-bottom: var(--space-24);
}

.hero {
  flex-direction: column;
  position: relative;
  @media (min-width: 768px) {
    flex-direction: row;
    align-items: center;
    min-height: 460px;
  }
}

.hero img {
  object-fit: cover;
  width: 100%;
  order: -1;
  height: 240px;
  mask-image: linear-gradient(to bottom, black 60%, transparent);
  @media (min-width: 768px) {
    position: absolute;
    right: 0;
    top: 0;
    width: min(760px, 60%);
    height: 460px;
    mask-image:
      linear-gradient(to right, transparent, black 40%),
      linear-gradient(to bottom, black 70%, transparent);
    mask-composite: intersect;
  }
}

/* OS is dark, and the user didn't pick Light */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hero img {
    filter: brightness(0.62) saturate(0.85);
  }
}

/* The user picked Dark */
:root[data-theme="dark"] .hero img {
  filter: brightness(0.62) saturate(0.85);
}

.hero-text {
  position: relative;
  gap: var(--space-5);
  max-width: 560px;
}

.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
}

.hero h1 {
  font-size: var(--text-display);
  line-height: 1.08;
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
}

.hero p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  max-width: 480px;
}

.hero ul {
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero li {
  border: var(--border-width) solid var(--border);
  font-size: 13px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background-color: var(--card-surface);
}

.hero a {
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--accent);
  border: var(--border-width) solid var(--accent-border);
  border-radius: var(--radius-full);
  padding: var(--space-3) 18px;
  text-decoration: none;
  align-self: flex-start;
  margin-top: var(--space-2);
}

.featured-projects {
  padding-top: var(--space-18);
  gap: var(--space-6);
}

.featured-projects-header {
  justify-content: space-between;
  align-items: baseline;
}

.featured-projects-header h2 {
  font-size: 22px;
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-snug);
}

.featured-projects-header a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
}

.featured-project {
  gap: var(--space-4);
  padding: var(--space-4);

  border: var(--border-width) solid var(--border);
  border-radius: var(--radius-lg);
  background-color: var(--card-surface);
  display: flex;
  flex-direction: column;

  @media (min-width: 768px) {
    flex-direction: row;
    gap: var(--space-8);
    padding: var(--space-6);
  }
}

.featured-project-left {
  flex-grow: 1;
  min-width: 0;
  gap: var(--space-6);
  justify-content: space-between;
  padding: var(--space-3) var(--space-2);
}

.featured-project-info {
  gap: var(--space-4);
}

.featured-project-title-row {
  align-items: center;
  gap: 14px;
}

.featured-project-title-row img {
  width: 44px;
  height: 44px;
}

.featured-project-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

.featured-project-body {
  font-size: 15px;
  color: var(--text-muted);
}

.featured-project-pills {
  flex-wrap: wrap;
  gap: var(--space-2);
}

.featured-project-pill {
  font-size: var(--text-xs);
  padding: 5px 11px;
  border: var(--border-width) solid var(--border);
  border-radius: var(--radius-full);
}

.featured-project-link {
  align-self: flex-start;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text);
  text-decoration: none;
}

img.featured-project-app,
video.featured-project-app {
  width: 100%;
  height: auto;
  aspect-ratio: 520/320;

  object-fit: cover;

  border-radius: var(--radius-md);

  @media (min-width: 768px) {
    width: min(520px, 50%);
    flex-shrink: 0;
    align-self: center;
  }
}