@import "tailwindcss";

@custom-variant dark (&:is(.dark *));

/*
 * Design tokens — the single place to restyle the app.
 * (The owner has a specific visual design planned; it lands here and in
 * component edits, not in structural changes.)
 */

:root {
	--radius: 0.625rem;
	--background: oklch(1 0 0);
	--foreground: oklch(0.145 0 0);
	--card: oklch(1 0 0);
	--card-foreground: oklch(0.145 0 0);
	--popover: oklch(1 0 0);
	--popover-foreground: oklch(0.145 0 0);
	--primary: oklch(0.205 0 0);
	--primary-foreground: oklch(0.985 0 0);
	--secondary: oklch(0.97 0 0);
	--secondary-foreground: oklch(0.205 0 0);
	--muted: oklch(0.97 0 0);
	--muted-foreground: oklch(0.556 0 0);
	--accent: oklch(0.97 0 0);
	--accent-foreground: oklch(0.205 0 0);
	--destructive: oklch(0.577 0.245 27.325);
	--border: oklch(0.922 0 0);
	--input: oklch(0.922 0 0);
	--ring: oklch(0.708 0 0);
}

.dark {
	--background: oklch(0.145 0 0);
	--foreground: oklch(0.985 0 0);
	--card: oklch(0.205 0 0);
	--card-foreground: oklch(0.985 0 0);
	--popover: oklch(0.205 0 0);
	--popover-foreground: oklch(0.985 0 0);
	--primary: oklch(0.922 0 0);
	--primary-foreground: oklch(0.205 0 0);
	--secondary: oklch(0.269 0 0);
	--secondary-foreground: oklch(0.985 0 0);
	--muted: oklch(0.269 0 0);
	--muted-foreground: oklch(0.708 0 0);
	--accent: oklch(0.269 0 0);
	--accent-foreground: oklch(0.985 0 0);
	--destructive: oklch(0.704 0.191 22.216);
	--border: oklch(1 0 0 / 10%);
	--input: oklch(1 0 0 / 15%);
	--ring: oklch(0.556 0 0);
}

@theme inline {
	--radius-sm: calc(var(--radius) - 4px);
	--radius-md: calc(var(--radius) - 2px);
	--radius-lg: var(--radius);
	--radius-xl: calc(var(--radius) + 4px);
	--color-background: var(--background);
	--color-foreground: var(--foreground);
	--color-card: var(--card);
	--color-card-foreground: var(--card-foreground);
	--color-popover: var(--popover);
	--color-popover-foreground: var(--popover-foreground);
	--color-primary: var(--primary);
	--color-primary-foreground: var(--primary-foreground);
	--color-secondary: var(--secondary);
	--color-secondary-foreground: var(--secondary-foreground);
	--color-muted: var(--muted);
	--color-muted-foreground: var(--muted-foreground);
	--color-accent: var(--accent);
	--color-accent-foreground: var(--accent-foreground);
	--color-destructive: var(--destructive);
	--color-border: var(--border);
	--color-input: var(--input);
	--color-ring: var(--ring);
}

* {
	border-color: var(--color-border);
}

body {
	background: var(--color-background);
	color: var(--color-foreground);
}

/* Thin dark native scrollbar (app-wide): dark thumb, transparent track. */
* {
	scrollbar-width: thin;
	scrollbar-color: var(--color-border) transparent;
}

::-webkit-scrollbar {
	width: 8px;
	height: 8px;
}

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

::-webkit-scrollbar-thumb {
	background: var(--color-border);
	border-radius: 8px;
}

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

/* Dock variant swap — quick fade/rise on content change; the shell's HEIGHT
   morph is separate (WAAPI in DockOverlay). Re-applied via class toggling, no
   remount, so collapsed-question state survives. */
@keyframes dock-variant-in {
	from {
		opacity: 0;
		transform: translateY(6px);
	}

	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.dock-variant {
	animation: dock-variant-in 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ============================================================
 * W3 — presentation fixes (appended 2026-08-22)
 * ============================================================ */

/* Streamdown's internal UI chrome (code blocks, tables, mermaid containers,
   copy/download buttons) is styled with Tailwind utilities living in its dist
 * bundle. Tailwind v4 never scans node_modules, so without this line those
 * classes are dead — code blocks and mermaid containers rendered unstyled.
 * (Streamdown README, "Tailwind CSS setup".) */
@source "../node_modules/streamdown/dist/*.js";

/* Token the streamdown utilities reference (code-block/mermaid chrome uses
 * bg-sidebar / border-sidebar): map it onto the app's card surface. */
@theme inline {
	--color-sidebar: var(--card);
}

/* Mermaid diagrams: keep wide charts inside the content column. Mermaid
 * inlines a px max-width on the svg, so !important is required to win. */
[data-streamdown="mermaid"] svg {
	max-width: 100% !important;
	height: auto !important;
}

/* Display math: long equations scroll instead of overflowing the column. */
.katex-display {
	overflow-x: auto;
	overflow-y: hidden;
}

/* ============================================================
 * Session status — phase colors + status dots
 * (picker strips, header chip, transcript dividers: one language)
 * ============================================================ */

/* Phase colors: blue = probing, violet = planning, green = teaching.
   Tuned per theme (light needs darker, dark lighter). The attention color
   (an answer the learner owes) is deliberately outside the phase system —
   dots and strips are separate channels and must not read as one. */
:root {
	--phase-probe: oklch(0.55 0.17 253);
	--phase-plan: oklch(0.54 0.19 300);
	--phase-teach: oklch(0.55 0.14 160);
	--attention: oklch(0.62 0.15 65);
}

.dark {
	--phase-probe: oklch(0.72 0.13 250);
	--phase-plan: oklch(0.72 0.14 300);
	--phase-teach: oklch(0.74 0.12 160);
	--attention: oklch(0.8 0.15 75);
}

@theme inline {
	--color-phase-probe: var(--phase-probe);
	--color-phase-plan: var(--phase-plan);
	--color-phase-teach: var(--phase-teach);
	--color-attention: var(--attention);
}

/* Status dots (session picker). Attention — a slow expanding ring, drawing
   the eye to "your move". Working — a quiet breathing dot, opacity only,
   never loud enough to compete with the attention ring. */
@keyframes lh-dot-attention {
	0% {
		box-shadow: 0 0 0 0 color-mix(in oklab, var(--attention) 60%, transparent);
	}

	70%,
	100% {
		box-shadow: 0 0 0 5px transparent;
	}
}

.lh-dot-attention {
	animation: lh-dot-attention 1.6s ease-out infinite;
}

@keyframes lh-dot-breathe {
	0%,
	100% {
		opacity: 0.35;
		transform: scale(0.75);
	}

	50% {
		opacity: 1;
		transform: scale(1);
	}
}

.lh-dot-breathe {
	animation: lh-dot-breathe 1.4s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {

	.lh-dot-attention,
		.lh-dot-breathe {
		animation: none;
	}
}