/* ============ solta — template v1 (dual theme, default light) ============ */
/* Light theme (default) */
:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --border: #e3e6ee;
  --text: #0c1120;
  --muted: #5a6376;
  --accent: #dd9412;
  --accent-2: #f06423;
  --accent-grad: linear-gradient(92deg, #f5b942, #ff7847);
  --header-bg: rgba(255, 255, 255, 0.82);
  --sun-1: rgba(245, 185, 66, 0.38);
  --sun-2: rgba(255, 120, 71, 0.15);
  --card-shadow: 0 1px 3px rgba(16, 24, 40, 0.05);
  --card-shadow-hover: 0 14px 34px rgba(16, 24, 40, 0.09);
  --card-hover-border: rgba(221, 148, 18, 0.5);
  --code-shadow: 0 24px 50px rgba(16, 24, 40, 0.16);
  --code-bg: #ffffff;
  --code-text: #1c2333;
  --tok-com: #7c8698;
  --tok-kw: #c2510f;
  --tok-fn: #a86e00;
  --tok-str: #177a49;
  --success: #14804f;
  --radius: 16px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Dark theme */
:root[data-theme="dark"] {
  --bg: #07090f;
  --bg-alt: #0b0e17;
  --surface: #10141f;
  --surface-2: #161b29;
  --border: #232a3d;
  --text: #eef1f8;
  --muted: #9aa4b8;
  --accent: #f5b942;
  --accent-2: #ff7847;
  --header-bg: rgba(7, 9, 15, 0.75);
  --sun-1: rgba(245, 185, 66, 0.5);
  --sun-2: rgba(255, 120, 71, 0.22);
  --card-shadow: none;
  --card-shadow-hover: none;
  --card-hover-border: rgba(245, 185, 66, 0.45);
  --code-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --code-bg: #0a0d16;
  --code-text: #e8ecf4;
  --tok-com: #5b6a86;
  --tok-kw: #ff9d6b;
  --tok-fn: #ffd479;
  --tok-str: #8be0a4;
  --success: #6fe3a5;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1140px, 92%); margin: 0 auto; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background-color 0.3s ease;
}
.site-header.scrolled { border-bottom-color: var(--border); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.header-right { display: flex; align-items: center; gap: 1.1rem; }
.wordmark {
  font-size: 1.35rem; font-weight: 800; letter-spacing: -0.02em;
  display: inline-flex; align-items: center; gap: 0.45rem;
}
.wordmark .tld { color: var(--accent); }
.sun-dot {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent-grad);
  box-shadow: 0 0 14px rgba(245, 185, 66, 0.65);
  flex: none;
}
.site-nav { display: flex; align-items: center; gap: 2rem; }
.site-nav a { color: var(--muted); font-size: 0.95rem; font-weight: 500; transition: color 0.2s; }
.site-nav a:hover { color: var(--text); }
.site-nav a.btn { color: #14100a; }
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text);
  margin: 5px 0; transition: transform 0.25s, opacity 0.25s;
}

/* ---------- theme toggle ---------- */
.theme-toggle {
  width: 38px; height: 38px; border-radius: 50%; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background-color 0.3s ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- buttons & forms ---------- */
.btn {
  display: inline-block; padding: 0.65rem 1.4rem; border-radius: 999px;
  font-weight: 600; font-size: 0.95rem; border: 1px solid transparent;
  cursor: pointer; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s;
}
.btn-primary { background: var(--accent-grad); color: #14100a; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(245, 185, 66, 0.45); }
.btn-ghost { border-color: var(--border); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-small { padding: 0.45rem 1.05rem; }

.waitlist-form {
  display: flex; gap: 0.6rem; flex-wrap: wrap;
  margin-top: 2rem; max-width: 480px;
}
.waitlist-form.center { margin-left: auto; margin-right: auto; }
.waitlist-form input {
  flex: 1 1 240px; padding: 0.7rem 1.1rem; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); font: inherit; font-size: 0.95rem; outline: none;
  transition: border-color 0.2s, background-color 0.3s ease;
}
.waitlist-form input:focus { border-color: var(--accent); }
.form-note { margin-top: 0.8rem; color: var(--muted); font-size: 0.88rem; min-height: 1.2em; }
.form-note.success { color: var(--success); }

/* ---------- hero ---------- */
.hero {
  position: relative; text-align: center;
  padding: 7.5rem 0 5.5rem; overflow: hidden;
}
.sun {
  position: absolute; top: -190px; left: 50%; transform: translateX(-50%);
  width: 480px; height: 480px; border-radius: 50%;
  background: radial-gradient(circle, var(--sun-1) 0%, var(--sun-2) 45%, transparent 70%);
  filter: blur(10px); pointer-events: none;
}
.sun-small {
  position: relative; top: 0; width: 190px; height: 190px;
  margin: 0 auto -70px; transform: translateX(0); left: auto;
}
.hero-inner { position: relative; }
.eyebrow {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.22em;
  color: var(--accent); text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(2.8rem, 7.5vw, 5.2rem); font-weight: 800;
  line-height: 1.04; letter-spacing: -0.03em; margin: 1.1rem 0 1.3rem;
}
.grad {
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub {
  max-width: 620px; margin: 0 auto; color: var(--muted); font-size: 1.13rem;
}
.hero .waitlist-form { margin-left: auto; margin-right: auto; }
.hero-stats {
  display: flex; justify-content: center; gap: clamp(1.6rem, 6vw, 4rem);
  margin-top: 3.2rem; flex-wrap: wrap;
}
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 1.45rem; font-weight: 800; }
.hero-stats span { color: var(--muted); font-size: 0.85rem; }

/* ---------- marquee ---------- */
.marquee {
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  overflow: hidden; padding: 0.9rem 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
          mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee-track {
  display: flex; gap: 1.4rem; white-space: nowrap; width: max-content;
  color: var(--muted); font-weight: 600; letter-spacing: 0.08em; font-size: 0.9rem;
  animation: marquee 26s linear infinite;
}
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- sections ---------- */
.section { padding: 5.5rem 0; }
.section-alt { background: var(--bg-alt); transition: background-color 0.3s ease; }
.section h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800;
  letter-spacing: -0.02em; margin: 0.7rem 0 0.8rem;
}
.section-sub { color: var(--muted); max-width: 560px; }
.grid { display: grid; gap: 1.2rem; margin-top: 2.6rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.7rem;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease;
}
.card:hover {
  transform: translateY(-3px); border-color: var(--card-hover-border);
  box-shadow: var(--card-shadow-hover);
}
.card .icon { font-size: 1.7rem; margin-bottom: 0.8rem; }
.card h3 { font-size: 1.12rem; font-weight: 700; margin-bottom: 0.45rem; }
.card p { color: var(--muted); font-size: 0.95rem; }

.model-tag {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.18em;
  color: var(--accent); margin-bottom: 0.6rem;
}
.specs { list-style: none; margin-top: 1rem; border-top: 1px solid var(--border); padding-top: 0.9rem; }
.specs li { color: var(--muted); font-size: 0.9rem; padding: 0.22rem 0; }

/* ---------- developers ---------- */
.dev-grid {
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 3rem; align-items: center;
}
.dev-grid .btn { margin-top: 1.6rem; }
.code-block {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; overflow-x: auto;
  font-family: var(--mono); font-size: 0.85rem; line-height: 1.75;
  color: var(--code-text);
  box-shadow: var(--code-shadow);
}
.c-com { color: var(--tok-com); }
.c-kw  { color: var(--tok-kw); }
.c-fn  { color: var(--tok-fn); }
.c-str { color: var(--tok-str); }

/* ---------- research ---------- */
.post-date {
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 0.6rem;
}
.post-link { display: inline-block; margin-top: 1rem; color: var(--accent); font-weight: 600; font-size: 0.92rem; }

/* ---------- cta ---------- */
.cta-section { text-align: center; position: relative; overflow: hidden; }
.cta-section .section-sub { margin: 0 auto; }
.cta-section h2 { margin-top: 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 3.5rem 0 2rem; background: var(--bg-alt); transition: background-color 0.3s ease; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem;
}
.footer-blurb { color: var(--muted); font-size: 0.92rem; margin-top: 0.9rem; }
.site-footer nav h4 { font-size: 0.9rem; margin-bottom: 0.9rem; }
.site-footer nav a {
  display: block; color: var(--muted); font-size: 0.92rem; padding: 0.28rem 0;
  transition: color 0.2s;
}
.site-footer nav a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  margin-top: 2.8rem; padding-top: 1.4rem; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.85rem;
}

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .dev-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid-3 { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg-alt); border-bottom: 1px solid var(--border);
    padding: 0.6rem 4%; display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 0.75rem 0.4rem; }
  .site-nav a.btn { text-align: center; margin: 0.5rem 0 0.9rem; }
  .hero { padding: 5rem 0 4rem; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}