/* ============================================================
   Seed Code Chat — Base / Reset / Typography
   ============================================================ */

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

html {
  height: 100%;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-15);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow: hidden;
}

body::before {
  /* Subtle Seed Code green wash across the top edge */
  content: "";
  position: fixed;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--brand-glow-strong), transparent);
  z-index: var(--z-modal);
  pointer-events: none;
  opacity: 0.6;
}

#app {
  height: 100%;
  width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--brand-strong);
  text-decoration: none;
}

a:hover {
  color: var(--brand-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

img,
svg,
canvas,
video {
  max-width: 100%;
  display: block;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--brand-strong);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

::selection {
  background: var(--brand-deep);
  color: #fff;
}

/* ---- Scrollbars ---- */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

::-webkit-scrollbar {
  width: var(--scrollbar-w);
  height: var(--scrollbar-w);
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--r-pill);
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--muted-2);
}

/* ---- Utility ---- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

[data-tooltip] {
  position: relative;
}

[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  background: var(--surface-4);
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 4px 8px;
  font-size: var(--fs-12);
  white-space: nowrap;
  pointer-events: none;
  z-index: var(--z-dropdown);
  box-shadow: var(--shadow-2);
}