/* ============================================================================
   AiOS Design System — shared token + component layer (additive, non-breaking)
   Loaded by landing.html, login.html, index.html.
   Theme-independent scales live on :root; each page keeps its own color palette
   (dark marketing / light console). Component classes reference brand + surface
   vars that exist in both, with safe fallbacks.
   ========================================================================== */

:root {
  /* Brand ------------------------------------------------------------------ */
  --ds-brand: #f5a623;          /* gold */
  --ds-brand-ink: #1b1204;      /* on-gold text */
  --ds-brand-2: #2dd4bf;        /* teal */

  /* Status ---------------------------------------------------------------- */
  --ds-ok: #16a34a;
  --ds-warn: #d97706;
  --ds-danger: #dc2626;
  --ds-info: #0ea5e9;

  /* Spacing scale (4px base) --------------------------------------------- */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px; --s-5: 20px;
  --s-6: 24px; --s-7: 32px; --s-8: 40px; --s-9: 48px; --s-10: 64px;

  /* Type scale (1.2) ----------------------------------------------------- */
  --fs-xs: 12px; --fs-sm: 13px; --fs-md: 14px; --fs-lg: 16px;
  --fs-xl: 18px; --fs-2xl: 20px; --fs-3xl: 24px; --fs-4xl: 32px;
  --lh-tight: 1.2; --lh-snug: 1.4; --lh-normal: 1.6; --lh-relaxed: 1.75;
  --fw-regular: 400; --fw-medium: 500; --fw-semibold: 600; --fw-bold: 700; --fw-black: 800;

  /* Radii ---------------------------------------------------------------- */
  --r-xs: 6px; --r-sm: 8px; --r-md: 14px; --r-lg: 20px; --r-full: 999px;

  /* Elevation ------------------------------------------------------------ */
  --sh-xs: 0 1px 2px rgba(8,12,20,.06);
  --sh-sm: 0 2px 8px -2px rgba(8,12,20,.10);
  --sh-md: 0 8px 24px -8px rgba(8,12,20,.16);
  --sh-lg: 0 24px 64px -24px rgba(8,12,20,.30);
  --sh-glow: 0 8px 36px -10px rgba(245,166,35,.45);

  /* Motion --------------------------------------------------------------- */
  --dur-fast: 150ms; --dur-base: 220ms; --dur-slow: 360ms;
  --ease-out: cubic-bezier(.22,.61,.36,1);
  --ease-in-out: cubic-bezier(.65,.05,.36,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);

  /* Focus ring ----------------------------------------------------------- */
  --ds-ring: var(--ds-brand);
}

/* === Accessibility: consistent keyboard focus everywhere ================== */
:where(a, button, input, select, textarea, [tabindex], [role="button"], .ds-btn):focus-visible {
  outline: 2px solid var(--ds-ring);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}
/* Don't show the ring on mouse/touch, only keyboard (default :focus-visible) */

/* === Buttons ============================================================= */
.ds-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  font-family: inherit; font-size: var(--fs-md); font-weight: var(--fw-semibold);
  line-height: 1; padding: 10px var(--s-4); border-radius: var(--r-sm);
  border: 1px solid transparent; cursor: pointer; user-select: none;
  background: var(--surface-2, rgba(255,255,255,.06)); color: var(--fg, inherit);
  transition: transform var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.ds-btn:hover { background: var(--surface-3, rgba(255,255,255,.10)); }
.ds-btn:active { transform: scale(.97); }
.ds-btn:disabled, .ds-btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; transform: none; }
.ds-btn--primary {
  background: linear-gradient(120deg, #ffd189, var(--ds-brand) 60%, #e08c00);
  color: var(--ds-brand-ink); border-color: transparent; box-shadow: var(--sh-glow);
}
.ds-btn--primary:hover { transform: translateY(-1px); filter: brightness(1.03); }
.ds-btn--ghost { background: transparent; border-color: var(--border, rgba(128,128,128,.25)); }
.ds-btn--ghost:hover { background: var(--surface-2, rgba(128,128,128,.08)); }
.ds-btn--block { width: 100%; }
.ds-btn[data-loading="true"] { color: transparent !important; pointer-events: none; position: relative; }
.ds-btn[data-loading="true"]::after {
  content: ""; position: absolute; width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid currentColor; border-top-color: transparent; opacity: .9;
  color: var(--ds-brand-ink); animation: ds-spin .7s linear infinite;
}
@keyframes ds-spin { to { transform: rotate(360deg); } }

/* === Skeletons =========================================================== */
.ds-skeleton {
  position: relative; overflow: hidden; border-radius: var(--r-sm);
  background: var(--surface-2, rgba(128,128,128,.12)); min-height: 1em;
}
.ds-skeleton::after {
  content: ""; position: absolute; inset: 0; transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.18), transparent);
  animation: ds-shimmer 1.3s ease-in-out infinite;
}
@keyframes ds-shimmer { 100% { transform: translateX(100%); } }
.ds-skel-line { height: 12px; margin: 8px 0; }
.ds-skel-line.w-60 { width: 60%; } .ds-skel-line.w-40 { width: 40%; } .ds-skel-line.w-80 { width: 80%; }

/* === Empty / Error states ================================================ */
.ds-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: var(--s-2); padding: var(--s-8) var(--s-5);
  color: var(--fg-muted, #8a93a3);
}
.ds-state svg { width: 34px; height: 34px; opacity: .6; }
.ds-state-title { font-weight: var(--fw-bold); font-size: var(--fs-md); color: var(--fg, inherit); }
.ds-state-msg { font-size: var(--fs-sm); max-width: 42ch; line-height: var(--lh-snug); }
.ds-state--error svg { color: var(--ds-danger); opacity: .85; }

/* === AI "thinking" / streaming indicator ================================= */
.ds-thinking { display: inline-flex; align-items: center; gap: 7px; font-size: var(--fs-sm); color: var(--fg-muted, #8a93a3); }
.ds-thinking .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ds-brand); animation: ds-bounce 1.2s ease-in-out infinite; }
.ds-thinking .dot:nth-child(2) { animation-delay: .15s; }
.ds-thinking .dot:nth-child(3) { animation-delay: .3s; }
@keyframes ds-bounce { 0%,80%,100% { transform: translateY(0); opacity: .5; } 40% { transform: translateY(-5px); opacity: 1; } }
/* Streaming text caret */
.ds-stream-caret::after { content: "▋"; margin-left: 1px; color: var(--ds-brand); animation: ds-blink 1s step-end infinite; }
@keyframes ds-blink { 50% { opacity: 0; } }

/* === Entrance (CSS-transition driven; JS toggles .ds-in when in view) ===== */
[data-animate] {
  opacity: 0; transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-spring);
  will-change: opacity, transform;
}
[data-animate="down"]  { transform: translateY(-14px); }
[data-animate="left"]  { transform: translateX(-14px); }
[data-animate="right"] { transform: translateX(14px); }
[data-animate="scale"] { transform: scale(.96); }
[data-animate].ds-in { opacity: 1; transform: none; }
/* Staggered children: hidden until revealed */
.ds-stagger-child { opacity: 0; transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-spring); will-change: opacity, transform; }
.ds-stagger-child.ds-in { opacity: 1; transform: none; }
/* Press micro-interaction */
.ds-pressable { transition: transform var(--dur-fast) var(--ease-spring); }
.ds-pressing { transform: scale(.96); transition: transform 90ms var(--ease-out); }

/* === Reduced motion: disable all of the above gracefully ================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important; animation-iteration-count: 1 !important;
    transition-duration: .001ms !important; scroll-behavior: auto !important;
  }
  [data-animate], .ds-stagger-child { opacity: 1 !important; transform: none !important; }
  .ds-skeleton::after, .ds-thinking .dot, .ds-stream-caret::after { animation: none !important; }
}