* { box-sizing: border-box; }

html { min-width: 320px; background: var(--bg); scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(ellipse at 70% 0%, rgba(35, 101, 111, .13), transparent 34rem),
    var(--bg);
  font-family: "Manrope", "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 0;
}

button, input { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
svg { display: block; }
[hidden] { display: none !important; }

.topbar {
  height: 66px;
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(18px, 4vw, 58px);
  border-bottom: 1px solid var(--border);
  background: var(--surface-glass);
  backdrop-filter: blur(18px);
}

.brand { display: inline-flex; gap: 10px; align-items: center; font-weight: 800; font-size: 16px; letter-spacing: -.5px; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; color: #0a171c; background: var(--cyan); font-size: 18px; font-weight: 800; }
.brand-light { color: var(--cyan); }
.topbar-meta, .eyebrow, .metric-label, .small-muted, .footer, .experiment-tag, .live-label, .range-scale, .energy-total, .chart-legend, .model-note { font-family: "DM Mono", monospace; }
.topbar-meta { display: flex; align-items: center; gap: 9px; color: var(--text-faint); font-size: 10px; letter-spacing: 1.1px; }
.live-dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; background: var(--green); box-shadow: 0 0 10px color-mix(in srgb, var(--green) 70%, transparent); }
.topbar-actions { display: flex; gap: 8px; }
.icon-button { width: 38px; height: 38px; display: grid; place-items: center; background: transparent; border: 1px solid transparent; border-radius: 10px; color: var(--text-soft); }
.icon-button:hover { color: var(--cyan); background: var(--cyan-soft); border-color: var(--border); }
.icon-button svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.theme-moon, [data-theme="light"] .theme-sun { display: none; }
[data-theme="light"] .theme-moon { display: block; }

main { width: min(1540px, 100%); margin: 0 auto; padding: 0 clamp(16px, 3vw, 46px) 36px; }
.intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; padding: clamp(30px, 4vw, 48px) 0 28px; }
.eyebrow { margin: 0 0 8px; color: var(--cyan); font-size: 9px; font-weight: 500; letter-spacing: 1.4px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 7px; font-size: clamp(30px, 4vw, 42px); line-height: 1.1; letter-spacing: -1.6px; font-weight: 700; }
h1 span { color: var(--cyan); }
.intro-copy { margin-bottom: 0; color: var(--text-soft); font-size: 13px; }
.experiment-tag { display: flex; align-items: center; gap: 11px; color: var(--text-faint); font-size: 9px; line-height: 1.8; letter-spacing: .45px; }
.experiment-tag strong { color: var(--text-soft); font-family: "Manrope", sans-serif; font-size: 11px; font-weight: 600; letter-spacing: 0; }
.tag-icon { width: 32px; height: 32px; display: grid; place-items: center; color: var(--cyan); border: 1px solid var(--border-strong); border-radius: 50%; font-size: 16px; }

.footer { max-width: 1540px; margin: 0 auto; padding: 16px clamp(18px, 4vw, 58px) 82px; display: flex; justify-content: space-between; gap: 15px; color: var(--text-faint); font-size: 9px; letter-spacing: .9px; }
.footer-divider { padding: 0 7px; color: var(--border-strong); }
.footer button { border: 0; background: none; color: var(--cyan); font: inherit; font-size: 9px; letter-spacing: .8px; }
.toast { position: fixed; z-index: 40; right: 24px; bottom: 24px; padding: 11px 16px; color: var(--text); background: var(--surface-raised); border: 1px solid var(--border-strong); border-radius: 10px; box-shadow: var(--shadow); opacity: 0; transform: translateY(8px); pointer-events: none; transition: opacity .2s, transform .2s; }
.toast.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 639px) {
  body { padding-bottom: 62px; }
  .topbar { height: 58px; padding: 0 16px; }
  .topbar-meta { font-size: 8px; letter-spacing: .6px; }
  .brand { font-size: 14px; }
  .brand-mark { width: 27px; height: 27px; }
  .icon-button { width: 36px; height: 36px; }
  .intro { padding: 27px 0 21px; }
  .experiment-tag { display: none; }
  .intro-copy { font-size: 12px; }
  .footer { padding-bottom: 20px; font-size: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}