/* Same look as okak0.com: dark dot-grid page, charcoal cards, white pill buttons.
   Theme follows the system (dark unless it prefers light) until the visitor picks one with
   the toggle, which is stored as data-theme on <html>. */
:root {
  --bg: #121212;
  --dot: rgba(255, 255, 255, 0.075);
  --card: #1d1d1d;
  --card-line: rgba(255, 255, 255, 0.07);
  --panel: #161616;
  --panel-line: rgba(255, 255, 255, 0.05);
  --chip: #232323;
  --text: #ececec;
  --dim: #9a9a9a;
  --faint: #6a6a6a;
  --yellow: #f2d633;
  --green: #3fd77f;
  --red: #ff5b54;
  --blue: #4c9dff;
  --font: "Outfit", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --btn: #f5f5f5;
  --btn-hover: #ffffff;
  --btn-ink: #121212;
  --hover: #2a2a2a;
  --shadow: rgba(0, 0, 0, 0.4);
  --card-hover-line: rgba(255, 255, 255, 0.12);
  --dot-main: #f0f0f0;
  --dot-ring: rgba(255, 255, 255, 0.06);
  --dot-off: #5c5c5c;
  --dashed: rgba(255, 255, 255, 0.14);
  --toggle: #5a5a5a;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f3f3f1;
    --toggle: #2b2b2b;
    --dot: rgba(0, 0, 0, 0.11);
    --card: #ffffff;
    --card-line: rgba(0, 0, 0, 0.08);
    --panel: #f6f6f4;
    --panel-line: rgba(0, 0, 0, 0.05);
    --chip: #e9e9e6;
    --text: #161616;
    --dim: #5d5d5d;
    --faint: #8a8a8a;
    --btn: #161616;
    --btn-hover: #000000;
    --btn-ink: #f5f5f5;
    --hover: #e2e2de;
    --shadow: rgba(0, 0, 0, 0.08);
    --card-hover-line: rgba(0, 0, 0, 0.16);
    --dot-main: #161616;
    --dot-ring: rgba(0, 0, 0, 0.06);
    --dot-off: #b5b5b5;
    --dashed: rgba(0, 0, 0, 0.18);
    --yellow: #d9b600;
    --green: #1fa85a;
    --red: #e0443d;
    --blue: #2f7fe0;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f3f3f1;
  --toggle: #2b2b2b;
  --dot: rgba(0, 0, 0, 0.11);
  --card: #ffffff;
  --card-line: rgba(0, 0, 0, 0.08);
  --panel: #f6f6f4;
  --panel-line: rgba(0, 0, 0, 0.05);
  --chip: #e9e9e6;
  --text: #161616;
  --dim: #5d5d5d;
  --faint: #8a8a8a;
  --btn: #161616;
  --btn-hover: #000000;
  --btn-ink: #f5f5f5;
  --hover: #e2e2de;
  --shadow: rgba(0, 0, 0, 0.08);
  --card-hover-line: rgba(0, 0, 0, 0.16);
  --dot-main: #161616;
  --dot-ring: rgba(0, 0, 0, 0.06);
  --dot-off: #b5b5b5;
  --dashed: rgba(0, 0, 0, 0.18);
  --yellow: #d9b600;
  --green: #1fa85a;
  --red: #e0443d;
  --blue: #2f7fe0;
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background-color: var(--bg);
  background-image: radial-gradient(circle, var(--dot) 1px, transparent 1.4px);
  background-size: 22px 22px;
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
main.wrap { max-width: 880px; }

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

.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
}
.logo { display: flex; align-items: center; gap: 12px; font-weight: 400; font-size: 17px; }
.logo svg { width: 30px; height: 30px; }
.top nav { display: flex; align-items: center; gap: 8px; }
.tab {
  padding: 10px 18px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 400;
  color: var(--dim);
  transition: color .15s, background .15s;
}
.tab:hover { color: var(--text); background: var(--chip); }

/* ---------- dots ---------- */

.dot { display: inline-block; width: 9px; height: 1.5px; border-radius: 1px; background: currentColor; flex: none; }
.dot.status.green { background: var(--green); }
.dot.status.yellow { background: var(--yellow); }
.dot.status.red { background: var(--red); }
.dot.status.blue { background: var(--blue); }
.dot.status.gray { background: var(--dot-off); }
.eyebrow .dot.green, .dot.status { width: 8px; height: 8px; border-radius: 50%; }
.eyebrow .dot.green { background: var(--green); box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 22%, transparent); }

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

.hero { padding: 56px 0 32px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px 7px 12px;
  border-radius: 999px;
  background: var(--chip);
  border: 1px solid var(--card-line);
  font-size: 13px;
  color: var(--dim);
}
.hero h1 {
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 22px 0 16px;
}
.hero .lead { color: var(--dim); font-size: 18px; margin: 0; max-width: 560px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 22px 0 0; padding: 0; }
.chips li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px 7px 12px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--card-line);
  font-size: 13.5px;
  color: var(--dim);
}

/* ---------- cards & panels ---------- */

.card {
  background: var(--card);
  border: 1px solid var(--card-line);
  border-radius: 18px;
  padding: 10px;
  box-shadow: 0 18px 40px var(--shadow);
}
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 12px;
}
.card > .panel + .panel,
.card > * + .panel { margin-top: 10px; }

/* ---------- buttons (pills) ---------- */

.btn {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  border: 1px solid var(--card-line);
  background: var(--chip);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
  transition: transform .12s, background .15s, color .15s;
}
.btn:hover { background: var(--hover); }
.btn.solid {
  background: var(--btn);
  color: var(--btn-ink);
  border-color: transparent;
  box-shadow: 0 6px 20px var(--shadow);
}
.btn.solid:hover { background: var(--btn-hover); transform: translateY(-1px); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--dim); padding: 8px 10px; }
.btn.ghost:hover { background: var(--chip); color: var(--text); }
.btn.ghost.danger:hover { color: var(--red); }
.btn.copied { background: var(--green); border-color: var(--green); color: #fff; }
.btn:focus-visible, .drop input:focus-visible + * { outline: 2px solid var(--blue); outline-offset: 2px; }
.btn svg { width: 16px; height: 16px; flex: none; }

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

.foot { margin-top: 96px; border-top: 1px solid var(--card-line); }
.foot .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 22px;
  padding-bottom: 36px;
  color: var(--faint);
  font-size: 13.5px;
}
.foot a:hover { color: var(--text); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 20px);
  background: var(--btn);
  color: var(--btn-ink);
  font-size: 14px;
  padding: 10px 18px;
  border-radius: 12px;
  box-shadow: 0 10px 30px var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s, transform .15s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- theme toggle ---------- */

.theme-toggle {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--chip);
  border: 1px solid var(--card-line);
  color: var(--text);
  cursor: pointer;
  padding: 0;
  transition: background .15s;
}
.theme-toggle:hover { background: var(--hover); }
.theme-toggle:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .sun { display: block; }
:root[data-theme="light"] .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-toggle .sun { display: block; }
  :root:not([data-theme="dark"]) .theme-toggle .moon { display: none; }
}

/* ---------- small screens ---------- */

@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .top .wrap { height: 72px; }
  .top nav .hide-sm { display: none; }
  .tab { padding: 10px 12px; }
  .hero { padding-top: 24px; }
  .hero .lead { font-size: 16px; }
}

.top, main, .foot { position: relative; z-index: 1; }
.toast { z-index: 10; }

/* ---------- ai: chat ---------- */

.tab { border: 0; background: transparent; font-family: var(--font); cursor: pointer; }
.hero { padding: 40px 0 26px; }
.hero h1 { font-size: clamp(34px, 5vw, 52px); }

.chat-card { display: flex; flex-direction: column; }
.chat-log {
  min-height: 340px;
  max-height: min(64vh, 720px);
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scroll-behavior: smooth;
}
.empty { margin: auto; text-align: center; padding: 30px 0; }
.empty-title { font-size: 18px; font-weight: 400; margin-bottom: 14px; }
.suggest { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.suggest .btn { white-space: normal; text-align: left; }

.msg { display: flex; flex-direction: column; gap: 6px; max-width: 100%; }
.msg .who { font-size: 12.5px; color: var(--faint); display: flex; align-items: center; gap: 8px; }
.msg.user { align-items: flex-end; }
.msg.user .bubble {
  background: var(--chip);
  border: 1px solid var(--card-line);
  border-radius: 14px 14px 4px 14px;
  padding: 10px 14px;
  max-width: 82%;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.msg.ai .bubble { max-width: 100%; overflow-wrap: anywhere; }
.msg .status-line { color: var(--dim); font-size: 14px; display: flex; align-items: center; gap: 10px; }
.msg .err { color: var(--red); font-size: 14px; }
.msg .tools { display: flex; gap: 4px; opacity: 0; transition: opacity .15s; }
.msg:hover .tools, .msg:focus-within .tools { opacity: 1; }
.msg .tools .btn { padding: 4px 8px; font-size: 12.5px; }
@media (hover: none) { .msg .tools { opacity: 1; } }

.spinner { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--dashed); border-top-color: var(--text); animation: spin .8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.cursor::after { content: ""; display: inline-block; width: 7px; height: 1.05em; margin-left: 2px; vertical-align: -0.15em; background: currentColor; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

details.think { border-left: 2px solid var(--dashed); padding-left: 12px; color: var(--dim); font-size: 14px; }
details.think summary { cursor: pointer; color: var(--faint); list-style: none; }
details.think summary::-webkit-details-marker { display: none; }

/* rendered markdown */
.prose { line-height: 1.65; }
.prose > :first-child { margin-top: 0; }
.prose > :last-child { margin-bottom: 0; }
.prose p, .prose ul, .prose ol, .prose pre, .prose blockquote, .prose table { margin: 0 0 12px; }
.prose ul, .prose ol { padding-inline-start: 22px; }
.prose li + li { margin-top: 4px; }
.prose h1, .prose h2, .prose h3, .prose h4 { font-weight: 500; line-height: 1.25; margin: 18px 0 8px; }
.prose h1 { font-size: 22px; } .prose h2 { font-size: 19px; } .prose h3, .prose h4 { font-size: 16.5px; }
.prose strong { font-weight: 500; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--chip); border-radius: 6px; padding: 1px 6px; }
.prose pre { position: relative; background: var(--bg); border: 1px solid var(--card-line); border-radius: 10px; padding: 14px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; font-size: 13.5px; line-height: 1.55; white-space: pre; }
.prose pre .copy-code { position: absolute; top: 6px; right: 6px; padding: 3px 9px; font-size: 12px; opacity: .8; }
.prose blockquote { border-left: 2px solid var(--dashed); padding-left: 12px; color: var(--dim); margin-inline: 0; }
.prose hr { border: 0; border-top: 1px solid var(--card-line); margin: 16px 0; }
.prose table { border-collapse: collapse; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--card-line); padding: 6px 10px; text-align: start; }
.prose th { font-weight: 500; }

.composer { padding: 12px; }
.composer textarea {
  width: 100%;
  resize: none;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 16px;
  line-height: 1.5;
  max-height: 220px;
  padding: 4px 4px 10px;
}
.composer textarea::placeholder { color: var(--faint); }
.composer-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.composer-bar .spacer { flex: 1; }
.composer-bar .hint { font-size: 12.5px; color: var(--faint); }
.model-pick { display: inline-flex; align-items: center; gap: 8px; }
.model-pick .field-label { margin: 0; font-size: 13px; color: var(--faint); }
.model-pick select {
  font-family: var(--font);
  font-size: 13.5px;
  color: var(--text);
  background: var(--chip);
  border: 1px solid var(--card-line);
  border-radius: 10px;
  padding: 7px 10px;
  max-width: 230px;
  cursor: pointer;
}
.model-pick select:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
#send.stop { background: var(--chip); color: var(--text); box-shadow: none; border-color: var(--card-line); }

@media (max-width: 640px) {
  .chat-log { padding: 12px; max-height: 62vh; }
  .composer-bar .hint { display: none; }
  .model-pick select { max-width: 170px; }
  .msg.user .bubble { max-width: 92%; }
}
.chat-log { scrollbar-width: thin; scrollbar-color: var(--dashed) transparent; }