/* app/styles.css */
:root {
  --buncss-light: initial;
  --buncss-dark: ;
  color-scheme: light dark;
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --card: #fff;
  --accent: #4f46e5;
  --accent-fg: #fff;
  --accent-soft: #eef2ff;
  --danger: #dc2626;
  --radius: 14px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --buncss-light: ;
    --buncss-dark: initial;
    --bg: #0c0a09;
    --fg: #fafaf9;
    --muted: #a8a29e;
    --line: #292524;
    --card: #1c1917;
    --accent: #818cf8;
    --accent-fg: #0c0a09;
    --accent-soft: #1e1b4b;
    --danger: #f87171;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  display: flex;
  background: var(--bg);
  color: var(--fg);
  font: 16px / 1.6 var(--font);
  flex-direction: column;
  min-height: 100dvh;
  margin: 0;
}

a {
  color: var(--accent);
}

h1, h2, h3 {
  letter-spacing: -.02em;
  margin: 0 0 .5em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
}

code {
  font-family: var(--mono);
  background: var(--accent-soft);
  border-radius: 6px;
  padding: .1em .4em;
  font-size: .9em;
}

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

.container {
  width: min(100% - 2rem, 64rem);
  margin-inline-start: auto;
  margin-inline-end: auto;
}

.narrow {
  width: min(100% - 2rem, 26rem);
  margin-inline-start: auto;
  margin-inline-end: auto;
}

.page {
  flex: 1;
  padding-block-start: 2.5rem;
  padding-block-end: 2.5rem;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  z-index: 10;
  top: 0;
}

.site-header .container {
  display: flex;
  align-items:  center;
  gap: 1.25rem;
  min-height: 3.5rem;
}

.brand {
  display: inline-flex;
  color: var(--fg);
  text-decoration: none;
  align-items:  center;
  gap: .6rem;
  font-weight: 700;
}

.brand img {
  width: 1.6rem;
  height: 1.6rem;
}

.site-nav {
  display: flex;
  flex: 1;
  gap: .25rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  border-radius: 8px;
  padding: .35rem .7rem;
  font-size: .95rem;
}

.site-nav a:hover {
  color: var(--fg);
  background: var(--accent-soft);
}

.site-nav a[aria-current="page"] {
  color: var(--fg);
  font-weight: 600;
}

.who {
  display: flex;
  color: var(--muted);
  align-items:  center;
  gap: .6rem;
  font-size: .9rem;
}

.avatar {
  display: grid;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 50%;
  place-items:  center;
  width: 1.9rem;
  height: 1.9rem;
  font-size: .85rem;
  font-weight: 700;
}

.btn {
  display: inline-flex;
  font: inherit;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
  text-decoration: none;
  border-radius: 10px;
  justify-content: center;
  align-items:  center;
  gap: .4rem;
  padding: .55rem 1.1rem;
  transition: transform 50ms, background .15s;
  font-weight: 600;
}

.btn:hover {
  background: var(--accent-soft);
}

.btn:active {
  transform: translateY(1px);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}

.btn.primary:hover {
  filter: brightness(1.08);
}

.btn.small {
  padding: .3rem .7rem;
  font-size: .85rem;
}

.btn:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.hero {
  padding-block-start: 3rem;
  padding-block-end: 2rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
  margin: 0 0 1rem;
  font-size: .78rem;
  font-weight: 700;
}

.lead {
  color: var(--muted);
  max-width: 42rem;
  font-size: 1.2rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-block-start: 1.75rem;
  margin-block-end: 3rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  list-style: none;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.features h3 {
  margin-bottom: .3rem;
  font-size: 1.05rem;
}

.features p {
  color: var(--muted);
  margin: 0;
  font-size: .95rem;
}

.form-card {
  margin-top: 4vh;
}

.form-card h1 {
  font-size: 1.6rem;
}

.field {
  display: grid;
  gap: .3rem;
  margin-bottom: 1rem;
}

.field label {
  font-size: .85rem;
  font-weight: 600;
}

input[type="text"], input[type="email"], input[type="password"] {
  font: inherit;
  border: 1px solid var(--line);
  background: var(--bg);
  color: inherit;
  border-radius: 10px;
  width: 100%;
  padding: .6rem .8rem;
}

.switch {
  text-align: center;
  color: var(--muted);
  margin: 1rem 0 0;
  font-size: .9rem;
}

.switch button {
  all: unset;
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
}

.error {
  color: var(--danger);
  margin: 0 0 1rem;
  font-size: .9rem;
}

.chat {
  display: flex;
  overflow: hidden;
  flex-direction: column;
  height: min(70dvh, 40rem);
  padding: 0;
}

.chat-log {
  overflow-y: auto;
  display: flex;
  list-style: none;
  flex-direction: column;
  flex: 1;
  gap: .6rem;
  margin: 0;
  padding: 1rem;
}

.chat-empty {
  color: var(--muted);
  text-align: center;
  margin: auto;
}

.msg {
  background: var(--accent-soft);
  border-radius: 14px;
  align-self:  flex-start;
  max-width: 80%;
  padding: .55rem .85rem;
}

.msg.mine {
  background: var(--accent);
  color: var(--accent-fg);
  align-self:  flex-end;
}

.msg small {
  display: block;
  opacity: .7;
  margin-bottom: .1rem;
  font-size: .75rem;
}

.msg p {
  overflow-wrap: anywhere;
  margin: 0;
}

.chat-form {
  display: flex;
  border-top: 1px solid var(--line);
  gap: .6rem;
  padding: .75rem;
}

.chat-form input {
  flex: 1;
}

.more {
  text-align: center;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding-block-start: 1.25rem;
  padding-block-end: 1.25rem;
  font-size: .85rem;
}

.problem {
  text-align: center;
  padding-block-start: 8vh;
  padding-block-end: 8vh;
}

.problem .lead {
  margin-inline-start: auto;
  margin-inline-end: auto;
}

.problem .code {
  color: var(--accent);
  margin: 0;
  font-size: clamp(3rem, 12vw, 6rem);
  font-weight: 800;
  line-height: 1;
}

.problem pre {
  text-align: left;
  background: var(--card);
  border: 1px solid var(--line);
  overflow: auto;
  font: .8rem / 1.5 var(--mono);
  border-radius: 10px;
  padding: 1rem;
}