/**
 * Pest Tech Research — Main Stylesheet
 *
 * Design tokens, CSS variables, reset, typography, and base layout.
 *
 * @package Pest_Tech_Research
 */

:root {
	/* Color Palette: Deep Industrial Navy & Technical Ochre / B2B Research Tone */
	--ptr-color-bg: #f8fafc;
	--ptr-color-surface: #ffffff;
	--ptr-color-surface-subtle: #f1f5f9;
	--ptr-color-surface-alt: #f8fafc;
	
	--ptr-color-text-main: #0f172a;
	--ptr-color-text-muted: #475569;
	--ptr-color-text-subtle: #64748b;
	--ptr-color-text-inverse: #ffffff;

	/* Brand Tokens: Deep Industrial Navy & Technical Ochre */
	--ptr-color-primary: #0f2942;
	--ptr-color-primary-hover: #163b5c;
	--ptr-color-primary-dark: #091929;
	
	--ptr-color-accent: #b45309;
	--ptr-color-accent-hover: #92400e;
	--ptr-color-accent-subtle: #fef3c7;
	
	--ptr-color-border: #e2e8f0;
	--ptr-color-border-strong: #cbd5e1;

	/* Evidence Status Indicators (4-State Standard) */
	--ptr-evidence-verified-bg: #ecfdf5;
	--ptr-evidence-verified-border: #a7f3d0;
	--ptr-evidence-verified-text: #065f46;
	--ptr-evidence-verified-dot: #059669;

	--ptr-evidence-claim-bg: #fffbeb;
	--ptr-evidence-claim-border: #fde68a;
	--ptr-evidence-claim-text: #92400e;
	--ptr-evidence-claim-dot: #b45309;

	--ptr-evidence-calc-bg: #f0f9ff;
	--ptr-evidence-calc-border: #bae6fd;
	--ptr-evidence-calc-text: #0369a1;
	--ptr-evidence-calc-dot: #0284c7;

	--ptr-evidence-unknown-bg: #f8fafc;
	--ptr-evidence-unknown-border: #cbd5e1;
	--ptr-evidence-unknown-text: #475569;
	--ptr-evidence-unknown-dot: #64748b;

	/* Typography Stack */
	--ptr-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	--ptr-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

	--ptr-font-size-xs: 0.75rem;    /* 12px */
	--ptr-font-size-sm: 0.875rem;   /* 14px */
	--ptr-font-size-base: 1rem;     /* 16px */
	--ptr-font-size-lg: 1.125rem;   /* 18px */
	--ptr-font-size-xl: 1.25rem;    /* 20px */
	--ptr-font-size-2xl: 1.5rem;    /* 24px */
	--ptr-font-size-3xl: 1.875rem;  /* 30px */
	--ptr-font-size-4xl: 2.25rem;   /* 36px */

	--ptr-line-height-tight: 1.2;
	--ptr-line-height-snug: 1.35;
	--ptr-line-height-normal: 1.6;
	--ptr-line-height-relaxed: 1.75;

	/* Spacing Scale */
	--ptr-space-1: 0.25rem;
	--ptr-space-2: 0.5rem;
	--ptr-space-3: 0.75rem;
	--ptr-space-4: 1rem;
	--ptr-space-6: 1.5rem;
	--ptr-space-8: 2rem;
	--ptr-space-12: 3rem;
	--ptr-space-16: 4rem;

	/* Structural Widths */
	--ptr-container-max: 1380px;
	--ptr-container-wide-max: 1440px;
	--ptr-container-reading-max: 840px;
	--ptr-content-max: 1120px;
	--ptr-reading-max: 840px;
	--ptr-article-max: 840px;

	/* Borders and Radii */
	--ptr-radius-sm: 3px;
	--ptr-radius-md: 6px;
	--ptr-radius-lg: 8px;

	/* Focus Ring */
	--ptr-focus-ring: 2px solid #b45309;
	--ptr-focus-offset: 2px;
}

/* CSS Reset & Base Elements */
*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	font-family: var(--ptr-font-sans);
	font-size: 16px;
	line-height: var(--ptr-line-height-normal);
	color: var(--ptr-color-text-main);
	background-color: var(--ptr-color-bg);
	-webkit-text-size-adjust: 100%;
	scroll-behavior: smooth;
}

body {
	margin: 0;
	padding: 0;
	background-color: var(--ptr-color-bg);
	color: var(--ptr-color-text-main);
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}

#page {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}

#content {
	flex: 1 0 auto;
}

/* Accessible Focus Indicator */
:focus-visible {
	outline: var(--ptr-focus-ring);
	outline-offset: var(--ptr-focus-offset);
}

/* Skip to Content Link */
.skip-link {
	position: absolute;
	top: -9999px;
	left: 50%;
	transform: translateX(-50%);
	background: var(--ptr-color-primary-dark);
	color: var(--ptr-color-text-inverse);
	padding: var(--ptr-space-2) var(--ptr-space-4);
	border-radius: var(--ptr-radius-md);
	z-index: 99999;
	text-decoration: none;
	font-weight: 600;
	font-size: var(--ptr-font-size-sm);
}

.skip-link:focus {
	top: var(--ptr-space-4);
	clip: auto;
	clip-path: none;
	height: auto;
	width: auto;
	overflow: visible;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
	outline: var(--ptr-focus-ring);
	outline-offset: var(--ptr-focus-offset);
}

/* Screen Reader Text Helper */
.screen-reader-text {
	border: 0;
	clip: rect(1px, 1px, 1px, 1px);
	clip-path: inset(50%);
	height: 1px;
	margin: -1px;
	overflow: hidden;
	padding: 0;
	position: absolute;
	width: 1px;
	word-wrap: normal !important;
}

/* Tabular Numerals for Consistent Numerical Data */
table,
.ptr-table,
.ptr-metric,
.ptr-price,
.ptr-calc-result,
.ptr-result-value,
.ptr-summary-value,
.ptr-stat-number,
.ptr-spec-value,
.ptr-calc-val,
.ptr-roi-metric,
.ptr-badge-evidence,
.ptr-evidence-badge,
input[type="number"] {
	font-variant-numeric: tabular-nums;
	font-feature-settings: "tnum" 1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
	color: var(--ptr-color-text-main);
	font-weight: 700;
	line-height: var(--ptr-line-height-tight);
	margin-top: 0;
	margin-bottom: var(--ptr-space-4);
}

h1 { font-size: var(--ptr-font-size-4xl); letter-spacing: -0.025em; }
h2 { font-size: var(--ptr-font-size-3xl); letter-spacing: -0.02em; margin-top: var(--ptr-space-8); }
h3 { font-size: var(--ptr-font-size-2xl); letter-spacing: -0.015em; margin-top: var(--ptr-space-6); }
h4 { font-size: var(--ptr-font-size-xl); margin-top: var(--ptr-space-4); }
h5 { font-size: var(--ptr-font-size-lg); }
h6 { font-size: var(--ptr-font-size-base); }

p {
	margin-top: 0;
	margin-bottom: var(--ptr-space-4);
	color: var(--ptr-color-text-main);
}

a {
	color: var(--ptr-color-primary);
	text-decoration: underline;
	text-decoration-thickness: 1px;
	text-underline-offset: 3px;
	transition: color 0.15s ease;
}

a:hover,
a:focus {
	color: var(--ptr-color-accent);
}

ul, ol {
	margin-top: 0;
	margin-bottom: var(--ptr-space-4);
	padding-left: var(--ptr-space-6);
}

li {
	margin-bottom: var(--ptr-space-2);
}

code, kbd, samp, pre {
	font-family: var(--ptr-font-mono);
	font-size: var(--ptr-font-size-sm);
}

code {
	background-color: var(--ptr-color-surface-subtle);
	padding: 0.15em 0.35em;
	border-radius: var(--ptr-radius-sm);
	border: 1px solid var(--ptr-color-border);
}

pre {
	background-color: var(--ptr-color-primary-dark);
	color: #f1f5f9;
	padding: var(--ptr-space-4);
	border-radius: var(--ptr-radius-md);
	overflow-x: auto;
	margin-bottom: var(--ptr-space-6);
}

pre code {
	background: transparent;
	padding: 0;
	border: 0;
	color: inherit;
}

blockquote {
	margin: var(--ptr-space-6) 0;
	padding: var(--ptr-space-4) var(--ptr-space-6);
	background-color: var(--ptr-color-surface-subtle);
	border-left: 4px solid var(--ptr-color-primary);
	border-radius: 0 var(--ptr-radius-md) var(--ptr-radius-md) 0;
}

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

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

/* Layout Utilities — Responsive Global Container System */
.ptr-container {
	width: min(calc(100% - 32px), var(--ptr-container-max, 1380px));
	margin-left: auto;
	margin-right: auto;
}

@media (min-width: 640px) {
	.ptr-container {
		width: min(calc(100% - 40px), var(--ptr-container-max, 1380px));
	}
}

@media (min-width: 768px) {
	.ptr-container {
		width: min(calc(100% - 48px), var(--ptr-container-max, 1380px));
	}
}

@media (min-width: 1440px) {
	.ptr-container {
		width: min(calc(100% - 64px), 1400px);
	}
}

.ptr-container-wide {
	width: min(calc(100% - 32px), var(--ptr-container-wide-max, 1440px));
	margin-left: auto;
	margin-right: auto;
}

@media (min-width: 768px) {
	.ptr-container-wide {
		width: min(calc(100% - 48px), var(--ptr-container-wide-max, 1440px));
	}
}

.ptr-container-reading {
	width: min(calc(100% - 32px), var(--ptr-container-reading-max, 840px));
	margin-left: auto;
	margin-right: auto;
}

@media (min-width: 768px) {
	.ptr-container-reading {
		width: min(calc(100% - 48px), var(--ptr-container-reading-max, 840px));
	}
}

.ptr-container-full {
	width: 100%;
	max-width: 100%;
	margin-left: 0;
	margin-right: 0;
}

.site-main {
	padding-top: var(--ptr-space-8);
	padding-bottom: var(--ptr-space-16);
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
	* {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
		scroll-behavior: auto !important;
	}
}