:root {
  --paper: #f7f2e9;
  --ink: #1f1f1c;
  --ink-soft: #3a3a33;
  --font-title: "Cormorant Garamond", "Times New Roman", serif;
  --font-body: "Cormorant Garamond", "Times New Roman", serif;
  --font-subtitle: "EB Garamond", "Times New Roman", serif;
  --paper-sheen-1: rgba(0, 0, 0, 0.02);
  --paper-sheen-2: rgba(0, 0, 0, 0.01);
  --paper-glow-1: rgba(255, 255, 255, 0.5);
  --paper-glow-2: rgba(0, 0, 0, 0.03);
  --bar-bg: rgba(247, 242, 233, 0.9);
  --bar-border: rgba(31, 31, 28, 0.08);
  --link-underline: rgba(31, 31, 28, 0.5);
  --link-underline-soft: rgba(31, 31, 28, 0.5);
  --link-underline-hover: rgba(31, 31, 28, 0.5);
  --control-bg: rgba(31, 31, 28, 0.06);
  --control-border: rgba(31, 31, 28, 0.2);
}

* {
  box-sizing: border-box;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14120f;
    --ink: #f1e7d6;
    --ink-soft: #cdbfae;
    --paper-sheen-1: rgba(255, 230, 200, 0.04);
    --paper-sheen-2: rgba(255, 230, 200, 0.02);
    --paper-glow-1: rgba(255, 235, 210, 0.03);
    --paper-glow-2: rgba(255, 220, 180, 0.06);
    --bar-bg: rgba(20, 18, 15, 0.92);
    --bar-border: rgba(241, 231, 214, 0.08);
    --link-underline: rgba(241, 231, 214, 0.45);
    --link-underline-soft: rgba(241, 231, 214, 0.35);
    --link-underline-hover: rgba(241, 231, 214, 0.65);
    --control-bg: rgba(241, 231, 214, 0.08);
    --control-border: rgba(241, 231, 214, 0.2);
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

body.theme-light {
  --paper: #f7f2e9;
  --ink: #1f1f1c;
  --ink-soft: #3a3a33;
  --paper-sheen-1: rgba(0, 0, 0, 0.02);
  --paper-sheen-2: rgba(0, 0, 0, 0.01);
  --paper-glow-1: rgba(255, 255, 255, 0.5);
  --paper-glow-2: rgba(0, 0, 0, 0.03);
  --bar-bg: rgba(247, 242, 233, 0.9);
  --bar-border: rgba(31, 31, 28, 0.08);
  --link-underline: rgba(31, 31, 28, 0.5);
  --link-underline-soft: rgba(31, 31, 28, 0.5);
  --link-underline-hover: rgba(31, 31, 28, 0.5);
  --control-bg: rgba(31, 31, 28, 0.06);
  --control-border: rgba(31, 31, 28, 0.2);
}

body.theme-dark {
  --paper: #14120f;
  --ink: #f1e7d6;
  --ink-soft: #cdbfae;
  --paper-sheen-1: rgba(255, 230, 200, 0.04);
  --paper-sheen-2: rgba(255, 230, 200, 0.02);
  --paper-glow-1: rgba(255, 235, 210, 0.03);
  --paper-glow-2: rgba(255, 220, 180, 0.06);
  --bar-bg: rgba(20, 18, 15, 0.92);
  --bar-border: rgba(241, 231, 214, 0.08);
  --link-underline: rgba(241, 231, 214, 0.45);
  --link-underline-soft: rgba(241, 231, 214, 0.35);
  --link-underline-hover: rgba(241, 231, 214, 0.65);
  --control-bg: rgba(241, 231, 214, 0.08);
  --control-border: rgba(241, 231, 214, 0.2);
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bar-bg);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--bar-border);
  z-index: 10;
}

.topbar-inner {
  height: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 6vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  text-decoration: none;
  color: inherit;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-family: var(--font-title);
}

.topbar-links {
  display: inline-flex;
  gap: 18px;
  align-items: center;
}

.topbar-link {
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
  font-family: var(--font-title);
}

.topbar-link:hover {
  color: var(--ink);
  border-color: var(--link-underline);
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: calc(6vh + 64px) 8vw 12vh;
  background-image:
    linear-gradient(180deg, var(--paper-sheen-1), var(--paper-sheen-2)),
    radial-gradient(circle at 20% 20%, var(--paper-glow-1), transparent 55%),
    radial-gradient(circle at 80% 75%, var(--paper-glow-2), transparent 50%);
}

.app-page {
  padding: calc(5vh + 64px) 6vw 10vh;
}

.app-shell {
  width: min(1100px, 100%);
  display: grid;
  gap: 16px;
}

.app-header {
  font-size: 1rem;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.app-header p {
  margin: 0;
}

.app-frame {
  min-height: 60vh;
  border: 1px solid var(--bar-border);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
  display: grid;
  place-items: center;
  color: var(--ink-soft);
}

.app-frame p {
  margin: 0;
  font-size: 1rem;
}

.about-page {
  padding: calc(6vh + 64px) 8vw 10vh;
}

.about-card {
  width: min(900px, 100%);
}

.about-card.single-column {
  display: block;
}

.about-content h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 4.4vw, 3rem);
  letter-spacing: 0.03em;
}

.about-content p {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.about-credentials {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  color: var(--ink);
}

.about-credentials li {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--bar-border);
  background: rgba(0, 0, 0, 0.03);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.about-credentials-inline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.about-link {
  display: inline-block;
  margin-top: 18px;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--link-underline-soft);
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.about-link:hover {
  border-color: var(--link-underline-hover);
}

@media (max-width: 800px) {
  .about-credentials-inline {
    gap: 8px;
  }
}

.center {
  text-align: center;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.subtitle {
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  font-family: var(--font-subtitle);
}

.footer {
  padding: 18px 6vw 28px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.footer-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.dot {
  opacity: 0.6;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.theme-option {
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  opacity: 0.6;
  text-transform: lowercase;
  font-family: var(--font-title);
}

.theme-option.is-active {
  opacity: 1;
}

.theme-option:focus {
  outline: 2px solid rgba(127, 127, 127, 0.4);
  outline-offset: 2px;
}

.slash {
  opacity: 0.5;
}

.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;
}