/* ================================================================
   Eidetic — sistema de diseño (HTML/CSS). Tokens en :root,
   los temas (assets/css/themes.css) los redefinen por [data-theme].
   Inspiración: aire y tipografía grande (OpenAI) + color (Google).
   ================================================================ */
:root{
  --bg:#ffffff; --surface:#ffffff; --surface-2:#f6f7f9;
  --ink:#0e1116; --ink-soft:#565d68; --ink-faint:#9aa1ac;
  --line:#e9ebef; --line-2:#e0e3e8;
  --accent:#304cf8; --accent-2:#20a8ed; --accent-ink:#ffffff; --accent-soft:#eef1ff;
  --radius:12px; --radius-lg:22px; --radius-pill:999px;
  --maxw:1180px; --shadow:0 1px 2px rgba(16,17,22,.04),0 8px 30px rgba(16,17,22,.06);
  --font:'Inter',system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --font-display:'Space Grotesk','Inter',system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
::selection{background:var(--accent);color:var(--accent-ink)}

.container{max-width:var(--maxw);margin-inline:auto;padding-inline:24px;width:100%}
.container--narrow{max-width:820px}
.section{padding-block:96px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent)}

h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.05;letter-spacing:-.025em;color:var(--ink)}
h1{font-size:clamp(2.6rem,6vw,4.6rem)}
h2{font-size:clamp(2rem,4vw,3.1rem)}
h3{font-size:1.3rem;letter-spacing:-.01em}
.lead{font-size:clamp(1.05rem,1.6vw,1.3rem);color:var(--ink-soft);line-height:1.55}

/* ---------- Botones ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font);font-weight:600;font-size:.95rem;
  padding:12px 22px;border-radius:var(--radius-pill);border:1.5px solid transparent;cursor:pointer;transition:.18s ease;white-space:nowrap}
.btn--primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn--primary:hover{filter:brightness(.94);transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn--ghost:hover{background:var(--surface-2);border-color:var(--ink-faint)}
.btn--dark{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn--dark:hover{opacity:.88}
.btn--sm{padding:8px 16px;font-size:.86rem}
.btn--lg{padding:15px 28px;font-size:1.02rem}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav__in{display:flex;align-items:center;justify-content:space-between;height:66px;gap:24px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--font-display);font-weight:700;font-size:1.15rem;letter-spacing:-.02em}
.brand__mark{width:22px;height:22px;border-radius:7px;background:var(--accent);position:relative;flex-shrink:0}
.brand__mark::after{content:"";position:absolute;inset:6px;border-radius:3px;background:var(--accent-ink);opacity:.9}
.nav__links{display:flex;gap:4px}
.nav__links a{font-size:.92rem;color:var(--ink-soft);padding:8px 12px;border-radius:9px;transition:.15s}
.nav__links a:hover{color:var(--ink);background:var(--surface-2)}
.nav__actions{display:flex;align-items:center;gap:10px}
.nav__toggle{display:none;width:40px;height:40px;border:none;background:none;flex-direction:column;gap:5px;justify-content:center;align-items:center;cursor:pointer;border-radius:9px}
.nav__toggle span{width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.2s}

/* ---------- Hero ---------- */
.hero{padding-block:clamp(70px,11vw,140px) 60px;text-align:center;position:relative;overflow:hidden}
.hero__glow{position:absolute;inset:-20% 0 auto 0;height:520px;z-index:0;pointer-events:none;
  background:radial-gradient(60% 60% at 50% 0%,color-mix(in srgb,var(--accent) 16%,transparent),transparent 70%)}
.hero__in{position:relative;z-index:1;max-width:880px;margin-inline:auto}
.hero h1{margin:20px 0 22px}
.hero .grad{background:linear-gradient(100deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.hero__note{margin-top:16px;font-size:.85rem;color:var(--ink-faint)}

/* mini demo del chat en el hero */
.demo{max-width:720px;margin:56px auto 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden;text-align:left}
.demo__bar{display:flex;gap:6px;padding:14px 18px;border-bottom:1px solid var(--line)}
.demo__bar i{width:10px;height:10px;border-radius:50%;background:var(--line-2)}
.demo__body{padding:22px;display:flex;flex-direction:column;gap:14px}
.demo .u{align-self:flex-end;background:var(--accent);color:var(--accent-ink);padding:10px 15px;border-radius:16px;max-width:75%;font-size:.95rem}
.demo .a{align-self:flex-start;max-width:88%;color:var(--ink)}
.demo .a b{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:4px;font-weight:700}
.demo__composer{display:flex;align-items:center;gap:10px;margin:6px 22px 22px;padding:9px 9px 9px 16px;border:1px solid var(--line-2);border-radius:var(--radius-pill);color:var(--ink-faint);font-size:.92rem}
.demo__composer .send{margin-left:auto;width:34px;height:34px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:flex;align-items:center;justify-content:center;font-size:1rem}

/* ---------- Features ---------- */
.grid-feats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:52px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px}
.card__ic{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:#fff}
.card h3{margin-bottom:8px}
.card p{color:var(--ink-soft);font-size:.96rem}
.section__head{max-width:640px}
.section__head.center{margin-inline:auto;text-align:center}
.section__head h2{margin:14px 0 12px}
.section__head p{color:var(--ink-soft);font-size:1.05rem}

/* ---------- Pasos ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:52px}
.step{padding-top:22px;border-top:2px solid var(--line-2)}
.step__n{font-family:var(--font-display);font-weight:700;color:var(--accent);font-size:.9rem}
.step h3{margin:10px 0 6px}
.step p{color:var(--ink-soft);font-size:.95rem}

/* ---------- Pricing ---------- */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:52px;align-items:start}
.plan{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;display:flex;flex-direction:column;gap:14px}
.plan--pop{border:1.5px solid var(--accent);box-shadow:var(--shadow);position:relative}
.plan__badge{position:absolute;top:-12px;left:28px;background:var(--accent);color:var(--accent-ink);font-size:.72rem;font-weight:700;padding:4px 12px;border-radius:var(--radius-pill)}
.plan__name{font-weight:600;color:var(--ink-soft)}
.plan__price{font-family:var(--font-display);font-size:2.6rem;font-weight:700;letter-spacing:-.03em}
.plan__price small{font-size:.9rem;font-weight:500;color:var(--ink-faint)}
.plan ul{display:flex;flex-direction:column;gap:9px;flex:1}
.plan li{font-size:.94rem;color:var(--ink-soft);display:flex;gap:9px}
.plan li::before{content:"✓";color:var(--accent);font-weight:700}

/* ---------- CTA band ---------- */
.cta{background:var(--ink);color:var(--bg);border-radius:calc(var(--radius-lg) + 8px);padding:64px 40px;text-align:center;position:relative;overflow:hidden}
.cta h2{color:var(--bg)}
.cta::before{content:"";position:absolute;inset:auto -10% -60% -10%;height:340px;background:radial-gradient(50% 60% at 50% 100%,color-mix(in srgb,var(--accent) 55%,transparent),transparent 70%)}
.cta__in{position:relative;z-index:1}
.cta .btn--primary{background:var(--bg);color:var(--ink);border-color:var(--bg)}

/* ---------- Footer ---------- */
.footer{border-top:1px solid var(--line);padding-block:56px 40px;margin-top:40px}
.footer__top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.footer__brand p{color:var(--ink-soft);font-size:.9rem;margin-top:12px;max-width:240px}
.footer h4{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:14px}
.footer__col a{display:block;color:var(--ink-soft);font-size:.92rem;padding:5px 0}
.footer__col a:hover{color:var(--ink)}
.footer__bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-top:44px;padding-top:24px;border-top:1px solid var(--line);color:var(--ink-faint);font-size:.85rem}

/* ================= APP DE CHAT ================= */
.app{display:grid;grid-template-columns:270px 1fr;height:100vh;background:var(--bg)}
.side{background:var(--surface-2);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:14px;gap:12px;min-height:0}
.side__brand{display:flex;align-items:center;gap:9px;font-family:var(--font-display);font-weight:700;padding:4px 6px}
.side__new{display:flex;align-items:center;gap:8px;justify-content:center;background:var(--accent);color:var(--accent-ink);border:none;font-weight:600;border-radius:var(--radius-pill);padding:11px;font-size:.92rem;cursor:pointer}
.side__search{border:1px solid var(--line-2);border-radius:10px;padding:9px 12px;font-size:.88rem;color:var(--ink-faint);background:var(--surface)}
.side__hist{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px;min-height:0}
.side__hist .grp{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);padding:12px 8px 4px}
.hitem{font-size:.9rem;color:var(--ink-soft);padding:9px 10px;border-radius:9px;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hitem:hover{background:var(--surface)}
.hitem.on{background:var(--accent-soft);color:var(--ink);font-weight:500}
.side__me{display:flex;align-items:center;gap:10px;padding:10px;border-top:1px solid var(--line);font-size:.88rem}
.side__me .av{width:28px;height:28px;border-radius:50%;background:var(--accent-2);flex-shrink:0}
.side__me small{color:var(--ink-faint)}

.chat{display:flex;flex-direction:column;min-width:0;height:100vh}
.chat__top{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--line);font-size:.92rem}
.chat__top .model{color:var(--ink-soft);display:flex;align-items:center;gap:6px}
.model-select{appearance:none;-webkit-appearance:none;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:5px 28px 5px 10px;font-size:.82rem;font-family:inherit;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23888'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 8px center;outline:none;transition:border-color .15s}
.model-select:hover,.model-select:focus{border-color:var(--accent)}
.thread{flex:1;overflow-y:auto;padding:28px 0}
.thread__in{max-width:760px;margin-inline:auto;padding-inline:24px;display:flex;flex-direction:column;gap:26px}
.msg{display:flex;flex-direction:column}
.msg.user{align-items:flex-end}
.msg.user .bubble{background:var(--accent);color:var(--accent-ink);padding:12px 18px;border-radius:20px;max-width:78%;line-height:1.5}
.msg.ai .who{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);font-weight:700;margin-bottom:6px}
.msg.ai .body{max-width:100%;line-height:1.35;color:var(--ink)}
.msg.ai .body p{margin:0 0 2px}
.msg.ai .acts{display:flex;gap:6px;margin-top:12px;color:var(--ink-faint)}
.msg.ai .acts span{font-size:.8rem;padding:5px 9px;border-radius:8px;border:1px solid var(--line);cursor:pointer}
.composer-wrap{padding:14px 24px 22px;background:linear-gradient(to top,var(--bg) 70%,transparent)}
.composer{max-width:760px;margin-inline:auto;display:flex;align-items:flex-end;gap:10px;background:var(--surface);border:1px solid var(--line-2);border-radius:26px;padding:10px 10px 10px 16px;box-shadow:var(--shadow)}
.composer .plus{width:34px;height:34px;border-radius:50%;background:var(--surface-2);color:var(--ink-soft);border:none;font-size:1.2rem;cursor:pointer;flex-shrink:0}
.composer .ta{flex:1;border:none;outline:none;resize:none;background:none;font-family:var(--font);font-size:1rem;color:var(--ink);padding:8px 0;max-height:120px}
.composer .ta::placeholder{color:var(--ink-faint)}
.composer .send{width:36px;height:36px;border-radius:50%;background:var(--accent);color:var(--accent-ink);border:none;font-size:1.1rem;cursor:pointer;flex-shrink:0}
.chat__hint{max-width:760px;margin:8px auto 0;text-align:center;font-size:.78rem;color:var(--ink-faint)}

/* empty state del chat */
.empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px;gap:8px}
.empty h2{font-size:2rem}
.suggest{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:20px}
.suggest span{border:1px solid var(--line-2);border-radius:var(--radius-pill);padding:9px 16px;font-size:.9rem;color:var(--ink-soft);cursor:pointer}
.suggest span:hover{border-color:var(--accent);color:var(--ink)}

/* ================= AUTH ================= */
.auth{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.auth__card{width:100%;max-width:400px;text-align:center}
.auth__card .brand{justify-content:center;margin-bottom:24px}
.auth__card h1{font-size:1.7rem;margin-bottom:6px}
.auth__card .lead{font-size:.98rem;margin-bottom:24px}
.field{width:100%;text-align:left;margin-bottom:12px}
.field label{display:block;font-size:.85rem;color:var(--ink-soft);margin-bottom:6px}
.field input{width:100%;padding:12px 14px;border:1px solid var(--line-2);border-radius:12px;font-family:var(--font);font-size:.95rem;background:var(--surface);color:var(--ink)}
.field input:focus{outline:none;border-color:var(--accent)}
.auth__card .btn{width:100%}
.oauth{width:100%;display:flex;align-items:center;justify-content:center;gap:10px;border:1px solid var(--line-2);border-radius:var(--radius-pill);padding:12px;font-weight:600;background:var(--surface);margin-bottom:14px;cursor:pointer}
.divider{display:flex;align-items:center;gap:12px;color:var(--ink-faint);font-size:.82rem;margin:16px 0}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}
.auth__alt{margin-top:18px;font-size:.9rem;color:var(--ink-soft)}
.auth__alt a{color:var(--accent);font-weight:500}
.auth__anon{margin-top:22px;font-size:.9rem}
.auth__anon a{color:var(--accent);font-weight:600}

/* ================= Conmutador de temas ================= */
.theme-switch{position:fixed;right:18px;bottom:18px;z-index:200;background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius-pill);box-shadow:var(--shadow);display:flex;gap:4px;padding:5px}
.theme-switch button{width:26px;height:26px;border-radius:50%;border:2px solid transparent;cursor:pointer;padding:0}
.theme-switch button[aria-pressed="true"]{border-color:var(--ink)}
.theme-switch .lbl{display:flex;align-items:center;font-size:.72rem;color:var(--ink-faint);padding:0 8px 0 6px;font-weight:600}

/* ================= Responsive ================= */
@media(max-width:900px){
  .grid-feats,.steps,.plans,.footer__top{grid-template-columns:1fr;gap:16px}
  .nav__links{display:none}
  .nav__toggle{display:flex}
  .section{padding-block:64px}
  .app{grid-template-columns:1fr}
  .side{position:fixed;inset:0 auto 0 0;width:280px;transform:translateX(-100%);transition:.28s;z-index:150}
  .side.open{transform:none}
}
@media(max-width:560px){
  .hero__cta{flex-direction:column}
  .footer__bottom{flex-direction:column;align-items:flex-start}
}

/* ===== Chat V16 · razonamiento, markdown, código y LaTeX ===== */
.msg.ai .think{margin:0 0 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);overflow:hidden}
.msg.ai .think>summary{list-style:none;cursor:pointer;padding:9px 14px;font-size:.82rem;color:var(--ink-soft);display:flex;align-items:center;gap:8px;user-select:none}
.msg.ai .think>summary::-webkit-details-marker{display:none}
.msg.ai .think>summary::before{content:"";width:6px;height:6px;border-right:2px solid var(--ink-faint);border-bottom:2px solid var(--ink-faint);transform:rotate(-45deg);transition:.2s;flex-shrink:0}
.msg.ai .think[open]>summary::before{transform:rotate(45deg)}
.msg.ai .think .think__label{font-weight:600;letter-spacing:.02em}
.msg.ai .think.live .think__label{color:var(--accent)}
.msg.ai .think.live .think__label::after{content:"";display:inline-block;width:6px;height:6px;margin-left:7px;border-radius:50%;background:var(--accent);animation:thinkpulse 1s infinite;vertical-align:middle}
@keyframes thinkpulse{0%,100%{opacity:.25}50%{opacity:1}}
.msg.ai .think__body{padding:4px 14px 12px;font-size:.9rem;color:var(--ink-soft);line-height:1.35;border-top:1px solid var(--line);max-height:360px;overflow:auto}
.msg.ai .think__body p{margin:2px 0}

.msg.ai .tool-chips{display:flex;flex-direction:column;gap:4px;margin:0 0 10px;padding:0}
.msg.ai .tool-step{font-size:.82rem;color:var(--ink-soft);background:var(--surface-2);border:1px solid var(--line);border-radius:8px;padding:6px 12px;line-height:1.45}
.msg.ai .tool-step.pending .tool-step__name{color:var(--accent)}
.msg.ai .tool-step__name{font-weight:500;word-break:break-word}
.msg.ai .tool-step__result{margin-top:4px;padding-top:4px;border-top:1px solid var(--line);font-size:.78rem;color:var(--ink-soft);white-space:pre-wrap;word-break:break-word;max-height:120px;overflow:auto}
.msg.ai .tool-step__error{color:var(--err, #d93025)}
.msg.ai .tool-step__toggle{background:none;border:none;color:var(--accent);font-size:.75rem;cursor:pointer;padding:2px 0;margin-top:2px}
.msg.ai .thinking-indicator .tool-step__name{color:var(--accent);animation:pulse-think 1.2s ease-in-out infinite}
@keyframes pulse-think{0%,100%{opacity:1}50%{opacity:.4}}
.msg.ai .loading-dots{font-size:.85rem;color:var(--ink-soft);padding:4px 0;display:flex;align-items:center;gap:1px}
.msg.ai .loading-dots .dot{animation:dotfade 1.4s infinite;opacity:.2}
.msg.ai .loading-dots .dot:nth-child(2){animation-delay:.2s}
.msg.ai .loading-dots .dot:nth-child(3){animation-delay:.4s}
.msg.ai .loading-dots .dot:nth-child(4){animation-delay:.6s}
@keyframes dotfade{0%,100%{opacity:.2}50%{opacity:1}}
.msg.ai .gen-img-wrap{margin:10px 0}
.msg.ai .gen-img{max-width:100%;border-radius:10px;border:1px solid var(--line)}
.msg.ai .gen-file-wrap{margin:8px 0}
.msg.ai .gen-file-btn{display:inline-flex;align-items:center;gap:10px;padding:8px 14px;border-radius:10px;background:var(--accent-soft);border:none;text-decoration:none;color:var(--ink);transition:opacity .15s}
.msg.ai .gen-file-btn:hover{opacity:.8}
.msg.ai .gen-file-btn .file-icon{width:28px;height:28px;border-radius:7px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.msg.ai .gen-file-btn .file-icon svg{width:14px;height:14px}
.msg.ai .gen-file-btn .file-info{display:flex;flex-direction:column;gap:0;min-width:0}
.msg.ai .gen-file-btn .file-name{font-size:.82rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.msg.ai .gen-file-btn .file-size{font-size:.68rem;color:var(--ink-soft);line-height:1.2}

.msg.ai .body h1,.msg.ai .body h2,.msg.ai .body h3,.msg.ai .body h4{font-family:var(--font-display);line-height:1.3;margin:12px 0 4px}
.msg.ai .body h1{font-size:1.4rem}.msg.ai .body h2{font-size:1.2rem}.msg.ai .body h3{font-size:1.05rem}
.msg.ai .body ul,.msg.ai .body ol{margin:0 0 3px;padding-left:22px}
.msg.ai .body li{margin:1px 0}
.msg.ai .body li>p{margin:1px 0}
.msg.ai .body a{color:var(--accent);text-decoration:underline}
.msg.ai .body hr{border:none;border-top:1px solid var(--line);margin:18px 0}
.msg.ai .body blockquote{border-left:3px solid var(--line-2);margin:0 0 6px;padding:2px 14px;color:var(--ink-soft)}
.msg.ai .body table{border-collapse:collapse;margin:0 0 14px;font-size:.9rem;display:block;overflow-x:auto;max-width:100%}
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