/* Base: Dark theme with red accents */
:root {
  --bg: #0b0c10;
  --bg-elev: #121318;
  --text: #e6e6e6;
  --muted: #a6a6a6;
  --accent: #e3342f;
  --accent-600: #c02622;
  --accent-700: #991b1b;
  --border: #24262e;
  --link: #ff4d45;
  --link-hover: #ffa39e;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 10px;
  --maxw: 72rem;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

html,
body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
}

/* Typography scale */
:root {
  --fs-300: clamp(0.85rem, 0.8rem + 0.2vw, 0.95rem);
  --fs-400: clamp(1rem, 0.95rem + 0.3vw, 1.125rem);
  --fs-500: clamp(1.15rem, 1.05rem + 0.8vw, 1.35rem);
  --fs-600: clamp(1.4rem, 1.2rem + 1.2vw, 1.75rem);
  --fs-700: clamp(1.8rem, 1.4rem + 2vw, 2.4rem);
  --fs-800: clamp(2.2rem, 1.8rem + 3vw, 3rem);
}

p {
  font-size: var(--fs-400);
  margin: 0 0 1rem;
  color: var(--text);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: var(--fs-800);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--fs-700);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--fs-600);
}

h4 {
  font-size: var(--fs-500);
}

/* Thematic emphasis */
.mark {
  background: linear-gradient(90deg, rgba(227, 52, 47, 0.2), rgba(227, 52, 47, 0.05));
  padding: 0.1em 0.25em;
  border-radius: 4px;
}

.emph {
  color: var(--link);
  font-weight: 600;
}

.muted {
  color: var(--muted);
}

/* Links */
a {
  color: var(--link);
  text-underline-offset: 2px;
  text-decoration-thickness: 2px;
}

a:hover {
  color: var(--link-hover);
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1rem;
}

main {
  display: block;
  min-height: 100vh;
}

.header,
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 12, 16, 0.7);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  max-width: var(--maxw);
  gap: 1rem;
  padding: 0.75rem 1rem;
}

.brand {
  font-weight: 900;
  font-size: var(--fs-600);
  letter-spacing: -0.02em;
}

.brand-accent {
  color: var(--accent);
}

nav a {
  color: var(--text);
  opacity: 0.9;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
}

nav a:hover {
  background: #171922;
  color: var(--link);
}

footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--muted);
}

.footer-inner {
  padding: 1.25rem;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

/* Cards / Surfaces */
.surface {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin-top: 0.25rem;
}

hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 1.5rem 0;
}

/* Code */
pre,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

code {
  background: #151822;
  border: 1px solid #23273a;
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
  color: #ffb4ae;
}

pre {
  background: #0f1220;
  border: 1px solid #1b2140;
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
}

/* Blockquotes */
blockquote {
  margin: 1rem 0;
  padding: 1rem;
  border-left: 4px solid var(--accent);
  background: linear-gradient(90deg, rgba(227, 52, 47, 0.08), rgba(227, 52, 47, 0));
  border-radius: 0 8px 8px 0;
  color: #f1f1f1;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-400);
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.625rem 0.75rem;
  text-align: left;
}

th {
  background: #15171f;
}

tr:nth-child(odd) td {
  background: #12141b;
}

/* Forms */
input,
select,
textarea {
  width: 100%;
  background: #0f1117;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent-600);
}

button {
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

button:hover {
  background: var(--accent-600);
}

button.ghost {
  background: transparent;
  color: var(--link);
  border: 1px solid var(--border);
}

button.ghost:hover {
  border-color: var(--accent);
  color: var(--link-hover);
}

/* Utilities */
.max-w-prose {
  max-width: 70ch;
}

.center {
  margin-inline: auto;
}

.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.grid {
  display: grid;
}

.wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-1 {
  gap: 0.25rem;
}

.gap-2 {
  gap: 0.5rem;
}

.gap-3 {
  gap: 0.75rem;
}

.gap-4 {
  gap: 1rem;
}

.gap-6 {
  gap: 1.5rem;
}

.p-0 {
  padding: 0;
}

.p-1 {
  padding: 0.25rem;
}

.p-2 {
  padding: 0.5rem;
}

.p-3 {
  padding: 0.75rem;
}

.p-4 {
  padding: 1rem;
}

.px-4 {
  padding-left: 1rem;
  padding-right: 1rem;
}

.py-4 {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.pt-8 {
  padding-top: 2rem;
}

.pb-8 {
  padding-bottom: 2rem;
}

.mt-0 {
  margin-top: 0;
}

.mt-2 {
  margin-top: 0.5rem;
}

.mt-4 {
  margin-top: 1rem;
}

.mt-6 {
  margin-top: 1.5rem;
}

.mt-8 {
  margin-top: 2rem;
}

.mb-0 {
  margin-bottom: 0;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-6 {
  margin-bottom: 1.5rem;
}

.mb-8 {
  margin-bottom: 2rem;
}

.rounded {
  border-radius: var(--radius);
}

.rounded-sm {
  border-radius: 6px;
}

.rounded-full {
  border-radius: 999px;
}

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

.shadow {
  box-shadow: var(--shadow);
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-muted {
  color: var(--muted);
}

.text-accent {
  color: var(--accent);
}

.bg-elev {
  background: var(--bg-elev);
}

.hidden {
  display: none;
}

/* Hero */
.hero {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1rem, 2vw + 1rem, 3rem);
  overflow: hidden;
  background: radial-gradient(1200px 600px at 10% -10%, rgba(227, 52, 47, 0.16), transparent 60%),
    radial-gradient(1200px 600px at 110% 110%, rgba(227, 52, 47, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
}

.hero-title {
  font-size: var(--fs-800);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: var(--fs-500);
  color: var(--muted);
  max-width: 65ch;
}

/* Responsive grid helpers */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 720px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .header-inner {
    padding: 0.9rem 1.25rem;
  }

  .footer-inner {
    padding: 1.5rem 1.25rem;
  }
}

/* Reading experience */
.article {
  max-width: var(--maxw);
  margin-inline: auto;
}

.article p {
  margin: 0 0 1.1rem;
}

.article img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.article h2 {
  margin-top: 1.5rem;
}

/* Callouts */
.callout {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  background: rgba(227, 52, 47, 0.05);
}

.callout.success {
  border-left-color: var(--success);
  background: rgba(34, 197, 94, 0.05);
}

.callout.warning {
  border-left-color: var(--warning);
  background: rgba(245, 158, 11, 0.06);
}

.callout.danger {
  border-left-color: var(--danger);
  background: rgba(239, 68, 68, 0.06);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4ch;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #121319;
  color: var(--muted);
}

.badge.red {
  color: #ffd4d1;
  background: #2a0f11;
  border-color: #4a1a1c;
}

/* KBD */
kbd {
  background: #0f1117;
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-color: #3a3f55;
  border-radius: 6px;
  padding: 0.15rem 0.35rem;
  box-shadow: inset 0 -1px 0 0 #3a3f55;
  font-size: 0.85em;
}

/* Accessibility helpers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 1px, 1px);
  white-space: nowrap;
  border: 0;
}

/* Selection */
::selection {
  background: rgba(227, 52, 47, 0.35);
  color: #fff;
}

/* Media elements */
img,
video {
  max-width: 100%;
  height: auto;
}

/* Lists */
ul,
ol {
  padding-left: 1.25rem;
}

li+li {
  margin-top: 0.25rem;
}

/* Navbar active */
.nav-active {
  color: var(--link);
  background: #171922;
}

/* SVG eyes background */
.eyes-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.eyes {
  position: absolute;
  top: 0;
  height: 100vh;
  width: 220px;
  opacity: 0.35;
  filter: saturate(130%);
}

.eyes.left {
  left: 0;
}

.eyes.right {
  right: 0;
  transform: scaleX(-1);
}

header.header,
.header,
main,
footer {
  position: relative;
  z-index: 1;
}