/* =========================================================================
 * base.css — reset, root variables, typography
 * ========================================================================= */

:root {
	/* Brand */
	--lb-primary       : #1FB6F5;
	--lb-primary-dark  : #0F8FC9;
	--lb-accent        : #00CFFF;

	/* Surfaces */
	--lb-surface       : #FFFFFF;
	--lb-subtle        : #F4F8FB;
	--lb-border        : #E5EAEE;

	/* Text */
	--lb-text          : #0F1419;
	--lb-muted         : #5C6770;

	/* Dark (footer) */
	--lb-dark-bg       : #0B1117;
	--lb-dark-surface  : #131B24;
	--lb-dark-text     : #C9D1D9;
	--lb-dark-muted    : #7E8893;
	--lb-dark-border   : #1F2A37;

	/* Type */
	--lb-font-sans     : 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
	--lb-font-mono     : 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

	/* Spacing scale */
	--lb-s-1: 0.5rem;
	--lb-s-2: 1rem;
	--lb-s-3: 1.5rem;
	--lb-s-4: 2rem;
	--lb-s-5: 3rem;
	--lb-s-6: 5rem;
	--lb-s-7: 7rem;

	/* Layout */
	--lb-container    : 1200px;
	--lb-container-wide: 1400px;
	--lb-content      : 760px;

	/* Radii / shadow */
	--lb-radius-sm    : 6px;
	--lb-radius       : 10px;
	--lb-radius-lg    : 16px;
	--lb-shadow-sm    : 0 1px 2px rgba(15, 20, 25, 0.04), 0 1px 1px rgba(15, 20, 25, 0.03);
	--lb-shadow       : 0 4px 14px rgba(15, 20, 25, 0.06), 0 2px 4px rgba(15, 20, 25, 0.04);
	--lb-shadow-lg    : 0 18px 36px rgba(15, 20, 25, 0.10), 0 6px 14px rgba(15, 20, 25, 0.06);

	/* Motion */
	--lb-ease         : cubic-bezier(.2,.7,.2,1);
	--lb-dur          : 180ms;
}

/* -------------------- Reset -------------------- */

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

html {
	-webkit-text-size-adjust: 100%;
	scroll-behavior: smooth;
}

body {
	margin: 0;
	font-family: var(--lb-font-sans);
	font-size: 1rem;
	line-height: 1.65;
	color: var(--lb-text);
	background: var(--lb-surface);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	text-rendering: optimizeLegibility;
}

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

button { font-family: inherit; }

a {
	color: var(--lb-primary);
	text-decoration: none;
	transition: color var(--lb-dur) var(--lb-ease);
}
a:hover, a:focus { color: var(--lb-primary-dark); }

:focus-visible {
	outline: 2px solid var(--lb-primary);
	outline-offset: 2px;
	border-radius: 2px;
}

/* -------------------- Typography -------------------- */

h1, h2, h3, h4, h5, h6 {
	margin: 0 0 0.5em;
	color: var(--lb-text);
	font-weight: 700;
	line-height: 1.2;
	letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 1.4rem + 2vw, 3rem); }
h2 { font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); }
h3 { font-size: 1.375rem; font-weight: 600; }
h4 { font-size: 1.125rem; font-weight: 600; }

p { margin: 0 0 1em; }

code, kbd, pre, samp {
	font-family: var(--lb-font-mono);
	font-size: 0.92em;
}

code {
	background: var(--lb-subtle);
	border: 1px solid var(--lb-border);
	border-radius: var(--lb-radius-sm);
	padding: 0.1em 0.35em;
}

pre {
	background: #0B1117;
	color: #C9D1D9;
	border-radius: var(--lb-radius);
	padding: var(--lb-s-3);
	overflow-x: auto;
	line-height: 1.55;
}
pre code { background: transparent; border: none; padding: 0; color: inherit; }

blockquote {
	margin: var(--lb-s-3) 0;
	padding: var(--lb-s-2) var(--lb-s-3);
	border-left: 4px solid var(--lb-primary);
	background: var(--lb-subtle);
	color: var(--lb-text);
	border-radius: 0 var(--lb-radius) var(--lb-radius) 0;
	font-style: italic;
}

hr {
	border: 0;
	height: 1px;
	background: var(--lb-border);
	margin: var(--lb-s-4) 0;
}

/* -------------------- Utilities -------------------- */

.screen-reader-text {
	clip: rect(1px, 1px, 1px, 1px);
	position: absolute !important;
	height: 1px; width: 1px; overflow: hidden;
	word-wrap: normal !important;
}

.skip-link {
	position: absolute;
	left: -9999px;
	z-index: 9999;
	background: var(--lb-primary);
	color: #fff;
	padding: 0.75rem 1rem;
	border-radius: var(--lb-radius);
	font-weight: 600;
}
.skip-link:focus { left: 1rem; top: 1rem; color: #fff; }