/* ========================================================================
   Variables
   ======================================================================== */
:root {
  /* Colors */
  --color-background: #0b1526; /* deep blue background */
  --color-surface: #111827; /* dark surface panels */
  --color-surface-alt: #1f2933; /* alternate surface / cards */
  --color-text: #f9fafb; /* primary text on dark */
  --color-text-muted: #9ca3af; /* secondary / muted text */
  --color-primary: #22c55e; /* soft green accent for CTAs */
  --color-primary-soft: rgba(34, 197, 94, 0.1);
  --color-success: #16a34a;
  --color-warning: #facc15;
  --color-danger: #ef4444;

  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2933; /* graphite-like */
  --color-gray-900: #0b1526;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "Roboto Mono", ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

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

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows (subtle, clean for trust-focused UI) */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.25);
  --shadow-sm: 0 4px 10px rgba(15, 23, 42, 0.3);
  --shadow-md: 0 10px 25px rgba(15, 23, 42, 0.4);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-normal: 180ms ease-out;
  --transition-slow: 250ms ease-out;
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================================================
   Reset / Normalize
   ======================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
}

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

img {
  height: auto;
}

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

button {
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure {
  margin: 0;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

/* ========================================================================
   Base Styles
   ======================================================================== */
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  background-color: var(--color-background);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

/* Headings - clean hierarchy for comparison grids */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-gray-50);
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-2);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

h6 {
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

p {
  margin-bottom: var(--space-3);
  /* comfortable line length for copy */
  color: var(--color-text-muted);
}

strong {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

/* Links - subtle, no default underline */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--color-success);
}

a:active {
  opacity: 0.85;
}

/* Focus-visible for keyboard users */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* ========================================================================
   Utilities
   ======================================================================== */

/* Layout container for clean grid-based layout */
.container {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--space-4);
  max-width: 1200px;
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-6);
  }
}

/* Flex utilities */
.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.gap-2 {
  gap: var(--space-2);
}

.gap-4 {
  gap: var(--space-4);
}

/* Simple grid utilities for offer comparison cards */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.muted {
  color: var(--color-text-muted);
}

.bg-surface {
  background-color: var(--color-surface);
}

.bg-surface-alt {
  background-color: var(--color-surface-alt);
}

.rounded-md {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.shadow-sm {
  box-shadow: var(--shadow-sm);
}

.shadow-md {
  box-shadow: var(--shadow-md);
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Spacing utilities (common for minimalist grids) */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.py-4 { padding-block: var(--space-4); }
.py-6 { padding-block: var(--space-6); }
.py-8 { padding-block: var(--space-8); }
.p-4  { padding: var(--space-4); }
.p-6  { padding: var(--space-6); }

/* ========================================================================
   Components
   ======================================================================== */

/* Buttons - primary CTAs for offers */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-inline: var(--space-4);
  padding-block: 0.625rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

.button-primary {
  background-color: var(--color-primary);
  color: #022c12;
  box-shadow: var(--shadow-sm);
}

.button-primary:hover {
  background-color: var(--color-success);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: #022c12;
}

.button-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.button-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.button-outline:hover {
  background-color: var(--color-primary-soft);
}

.button:disabled,
.button[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/* Inputs - for search / filters */
.input,
.select,
.textarea {
  width: 100%;
  padding-inline: var(--space-3);
  padding-block: 0.625rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-700);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-gray-500);
}

.input:focus-visible,
.select:focus-visible,
.textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

.input[disabled],
.select[disabled],
.textarea[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Cards - comparison-style offer blocks */
.card {
  position: relative;
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(148, 163, 184, 0.15);
}

.card-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-gray-50);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.card-body {
  display: grid;
  gap: var(--space-2);
}

.card-footer {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

/* Offer-specific subtle badge */
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-full);
  padding-inline: var(--space-2);
  padding-block: 0.25rem;
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge-success {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.badge-neutral {
  background-color: rgba(148, 163, 184, 0.15);
  color: var(--color-gray-300);
}

/* ========================================================================
   Accessibility Helpers
   ======================================================================== */

/* Improve focus appearance on dark background */
@supports selector(:focus-visible) {
  :focus {
    outline: none;
  }
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 0.75rem;
  transform: translateX(-50%);
  padding: 0.5rem 1rem;
  background-color: var(--color-primary);
  color: #022c12;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.skip-link:focus-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0.25rem);
}

/* ========================================================================
   Betting Aggregator Specific Helpers
   ======================================================================== */

/* Stripe-like, trustworthy header */
.site-header {
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
  background: linear-gradient(to bottom, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.9));
  backdrop-filter: blur(18px);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
}

.brand-mark-dot {
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, #bbf7d0, var(--color-primary));
}

/* Subtle disclaimer / responsible betting section */
.responsible-block {
  font-size: var(--font-size-xs);
  color: var(--color-gray-400);
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding-block: var(--space-4);
}

.responsible-block a {
  color: var(--color-gray-200);
  text-decoration: underline;
}

.responsible-block a:hover {
  color: var(--color-primary);
}