/* Calculator Agent: fonts and design tokens first, then layout, then components. */

/* Self-hosted fonts (SIL Open Font License, see /fonts): no third-party requests */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/inter-latin-ext-wght-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/inter-latin-wght-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/jetbrains-mono-latin-ext-wght-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/jetbrains-mono-latin-wght-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --surface-2: #f0eee9;
  --border: #e3e0d8;
  --border-strong: #cfcac0;
  --text: #1b1b1a;
  --text-2: #5d5a54;
  --text-3: #8a867e;
  --accent: #e8590c;
  --accent-hover: #cc4d09;
  --accent-soft: #fdeee4;
  --accent-ink: #ffffff;
  --logo: #1b1b1a;
  --ok: #2f7d4f;
  --ok-soft: #e6f3eb;
  --err: #b42318;
  --err-soft: #fdecea;
  --shadow: 0 1px 2px rgb(20 18 14 / 0.05), 0 4px 16px rgb(20 18 14 / 0.05);
  --radius: 14px;
  --radius-sm: 9px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --maxw: 780px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1011;
    --surface: #17181a;
    --surface-2: #1f2023;
    --border: #2a2b2f;
    --border-strong: #3a3b40;
    --text: #ecebe8;
    --text-2: #a9a6a0;
    --text-3: #7a7771;
    --accent: #ff7a2f;
    --accent-hover: #ff8f50;
    --accent-soft: #2b1a10;
    --accent-ink: #17181a;
    --logo: #ecebe8;
    --ok: #5cc98a;
    --ok-soft: #13261b;
    --err: #ff8a80;
    --err-soft: #2e1614;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.4);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f1011;
  --surface: #17181a;
  --surface-2: #1f2023;
  --border: #2a2b2f;
  --border-strong: #3a3b40;
  --text: #ecebe8;
  --text-2: #a9a6a0;
  --text-3: #7a7771;
  --accent: #ff7a2f;
  --accent-hover: #ff8f50;
  --accent-soft: #2b1a10;
  --accent-ink: #17181a;
  --logo: #ecebe8;
  --ok: #5cc98a;
  --ok-soft: #13261b;
  --err: #ff8a80;
  --err-soft: #2e1614;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.4);
  color-scheme: dark;
}

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

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

button { font: inherit; color: inherit; cursor: pointer; }
a { color: inherit; }
code, output, .mono { font-family: var(--mono); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.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;
}

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 20; }
.skip-link:focus { left: 8px; }

/* ---------- Top bar ---------- */

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 20px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.logo { color: var(--logo); display: grid; }
.logo svg rect { fill: var(--accent); }
.logo svg path { stroke: #fff; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.brand-name { font-weight: 650; letter-spacing: -0.01em; white-space: nowrap; }
.brand-sub { font-size: 12.5px; color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.top-actions { display: flex; align-items: center; gap: 6px; }

.model-badge {
  font: 500 12px/1 var(--mono);
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 6px 8px; border-radius: 999px;
  margin-right: 4px;
}

.btn-ghost {
  white-space: nowrap;
  background: transparent; border: 1px solid var(--border);
  padding: 7px 12px; border-radius: 999px; font-size: 13.5px; font-weight: 500;
}
.btn-ghost:hover { background: var(--surface-2); }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border-radius: 999px;
  border: 1px solid transparent; background: transparent; color: var(--text-2);
  text-decoration: none;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }

.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}

.notice {
  max-width: var(--maxw); margin: 16px auto 0; padding: 10px 14px;
  width: calc(100% - 32px);
  background: var(--err-soft); color: var(--err);
  border: 1px solid color-mix(in srgb, var(--err) 30%, transparent);
  border-radius: var(--radius-sm); font-size: 14px;
}

/* ---------- Main column ---------- */

.main {
  flex: 1;
  width: 100%; max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 16px 24px;
}

.empty { padding: 5vh 4px 8px; }
.eyebrow {
  margin: 0 0 10px; color: var(--accent);
  font: 600 12px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em;
}
.empty h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 40px); line-height: 1.12; letter-spacing: -0.025em; font-weight: 700;
  text-wrap: balance;
}
.lede { margin: 0 0 28px; color: var(--text-2); font-size: 16.5px; max-width: 60ch; text-wrap: pretty; }

.examples { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.example {
  text-align: left; display: flex; flex-direction: column; gap: 6px;
  padding: 14px 16px; min-height: 96px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color .15s, transform .15s;
}
.example:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.example-tag { font: 500 11.5px/1 var(--mono); color: var(--text-3); text-transform: uppercase; letter-spacing: 0.06em; }
.example-text { font-size: 14.5px; line-height: 1.45; }

/* ---------- Thread ---------- */

.thread { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 18px; }
.msg-user { display: flex; justify-content: flex-end; }
.bubble {
  max-width: 85%;
  background: var(--surface-2); border: 1px solid var(--border);
  padding: 10px 14px; border-radius: 16px 16px 4px 16px;
  white-space: pre-wrap; overflow-wrap: anywhere;
}

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
.card-head {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 12px 16px 0;
}
.agent-name { font-weight: 600; font-size: 13.5px; display: inline-flex; align-items: center; gap: 8px; }
.agent-name::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--accent); }

.status { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--text-3); font-family: var(--mono); }
.status[hidden] { display: none; }
.spinner {
  width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid var(--border-strong); border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Trace timeline */
.trace { margin: 10px 16px 0; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); }
.trace summary {
  cursor: pointer; list-style: none; padding: 8px 12px;
  font: 500 12.5px/1.4 var(--mono); color: var(--text-2);
  display: flex; align-items: center; gap: 8px;
}
.trace summary::-webkit-details-marker { display: none; }
.trace summary::before {
  content: ""; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg); transition: transform .15s; margin-right: 2px;
}
.trace[open] summary::before { transform: rotate(45deg); }
.trace[hidden] { display: none; }

.steps { list-style: none; margin: 0; padding: 2px 12px 12px 12px; }
.step { position: relative; padding: 6px 0 6px 26px; font-size: 13.5px; }
.step::before {
  content: ""; position: absolute; left: 7px; top: 0; bottom: 0; width: 1.5px; background: var(--border);
}
.step:first-child::before { top: 14px; }
.step:last-child::before { bottom: calc(100% - 14px); }
.step-dot {
  position: absolute; left: 2px; top: 9px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--border-strong);
}
.step-model .step-dot { border-color: var(--accent); }
.step-tool .step-dot { border-color: var(--text-2); border-radius: 3px; }
.step-done .step-dot { background: var(--ok); border-color: var(--ok); }
.step-err .step-dot { background: var(--err); border-color: var(--err); }

.step-label { font: 500 11.5px/1.5 var(--mono); color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; }
.step-text { color: var(--text-2); margin-top: 1px; }
.step-text p { margin: 0 0 4px; }
.step-text p:last-child { margin-bottom: 0; }
.step-text ol, .step-text ul { margin: 0 0 4px; padding-left: 18px; }

.tool-line {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 8px; margin-top: 3px;
  font: 13px/1.5 var(--mono);
}
.tool-name { background: var(--surface-2); border: 1px solid var(--border); padding: 0 6px; border-radius: 5px; font-size: 12px; }
.tool-expr { color: var(--text); overflow-wrap: anywhere; }
.tool-arrow { color: var(--text-3); }
.tool-out { color: var(--ok); font-weight: 600; overflow-wrap: anywhere; }
.tool-out.is-err { color: var(--err); font-weight: 500; }
.tool-pending { color: var(--text-3); }

/* Answer body */
.body { padding: 14px 16px 4px; overflow-wrap: anywhere; }
.body:empty { display: none; }
.body p { margin: 0 0 10px; }
.body ol, .body ul { margin: 0 0 10px; padding-left: 22px; }
.body li { margin: 2px 0; }
.body code { background: var(--surface-2); padding: 1px 5px; border-radius: 5px; font-size: 0.9em; }
.body.is-error { color: var(--err); }

.result {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px 12px;
  margin: 6px 16px 14px; padding: 12px 14px;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: var(--radius-sm);
}
.result[hidden] { display: none; }
.result-label { font: 600 11.5px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); }
.result-value {
  flex: 1; font-family: var(--font); font-size: clamp(19px, 3.4vw, 24px); font-weight: 650;
  letter-spacing: -0.015em; font-variant-numeric: tabular-nums; overflow-wrap: anywhere;
}
.result-label { grid-column: 1; }
.result-value { grid-column: 1; }
.copy { grid-column: 2; grid-row: 1 / span 2; }
.copy.copied { color: var(--ok); }

.stats {
  display: flex; flex-wrap: wrap; gap: 4px 14px;
  padding: 10px 16px; border-top: 1px solid var(--border);
  font: 12px/1.5 var(--mono); color: var(--text-3);
}
.stats[hidden] { display: none; }

/* ---------- Composer ---------- */

.composer-wrap {
  position: sticky; bottom: 0;
  background: linear-gradient(to top, var(--bg) 70%, transparent);
  padding: 12px 16px 16px;
}
.composer {
  max-width: var(--maxw); margin: 0 auto;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 8px 8px 6px;
}
.composer:focus-within { border-color: var(--accent); }

.keys { display: flex; gap: 4px; overflow-x: auto; padding: 2px 2px 6px; scrollbar-width: none; }
.keys::-webkit-scrollbar { display: none; }
.key {
  flex: none; min-width: 36px; height: 30px; padding: 0 8px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
  font: 500 14px/1 var(--mono); color: var(--text-2);
}
.key:hover { border-color: var(--border-strong); color: var(--text); }

.input-row { display: flex; align-items: flex-end; gap: 8px; }
textarea {
  flex: 1; resize: none; border: 0; outline: 0; background: transparent; color: var(--text);
  font: 15.5px/1.5 var(--font); padding: 8px 6px; max-height: 180px; min-height: 40px;
}
textarea::placeholder { color: var(--text-3); }
textarea:focus-visible { outline: none; }

.send {
  flex: none; width: 42px; height: 42px; border-radius: 12px; border: 0;
  background: var(--accent); color: #fff; display: grid; place-items: center;
  transition: background .15s, transform .1s;
}
.send:hover { background: var(--accent-hover); }
.send:active { transform: scale(0.96); }
.send:disabled { background: var(--border-strong); cursor: not-allowed; }

.composer-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 6px 6px 2px; font-size: 12px; color: var(--text-3);
}
.composer-meta .hint { margin-left: auto; }
.link-btn { background: none; border: 0; padding: 0; color: var(--accent); font-size: 12px; font-weight: 500; }
.link-btn:hover { text-decoration: underline; }
.link-btn[hidden] { display: none; }

/* ---------- How it works dialog ---------- */

.drawer {
  width: min(560px, calc(100% - 24px)); max-height: calc(100dvh - 48px);
  border: 1px solid var(--border); border-radius: 18px;
  background: var(--surface); color: var(--text); padding: 22px 24px;
  box-shadow: 0 20px 60px rgb(0 0 0 / 0.25);
}
.drawer::backdrop { background: rgb(10 10 10 / 0.45); backdrop-filter: blur(2px); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; }
.drawer h2 { margin: 0; font-size: 20px; letter-spacing: -0.01em; }
.drawer-lede { color: var(--text-2); margin: 6px 0 14px; }
.drawer-foot { color: var(--text-2); font-size: 13.5px; margin: 14px 0 0; }
.drawer-foot a { color: var(--accent); }

.loop-figure { margin: 0 0 12px; padding: 12px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-2); }
.loop-figure svg { width: 100%; height: auto; display: block; }
.fig-node rect { fill: var(--surface); stroke: var(--border-strong); stroke-width: 1.5; }
.fig-node text { fill: var(--text); font: 600 14px var(--font); text-anchor: middle; }
.fig-accent rect { fill: var(--accent-soft); stroke: var(--accent); }
.fig-edge path { fill: none; stroke: currentColor; stroke-width: 1.5; }
.fig-label { fill: var(--text-3); font: 500 11px var(--mono); text-anchor: middle; }

.parts { margin: 0; padding-left: 20px; display: grid; gap: 8px; font-size: 14.5px; }
.parts code { background: var(--surface-2); padding: 1px 5px; border-radius: 5px; font-size: 0.9em; }

/* ---------- Responsive + motion ---------- */

@media (max-width: 640px) {
  .topbar { padding: 10px 16px; }
  .brand-sub, .model-badge, .composer-meta .hint { display: none; }
  .top-actions { gap: 2px; }
  .brand { gap: 8px; }
  .brand-name { font-size: 15px; }
  .btn-ghost { padding: 5px 10px; font-size: 12.5px; }
  .btn-ghost { padding: 6px 10px; font-size: 13px; }
  .examples { grid-template-columns: 1fr; }
  .example { min-height: 0; }
  .main { padding-top: 20px; }
  .empty { padding-top: 2vh; }
  .bubble { max-width: 92%; }
  .drawer { padding: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}