:root {
  /* =============================
   * Color System
   * ============================= */
  --color-bg: #f7f8ff; /* overall page background */
  --color-surface: #ffffff;
  --color-text: #101322;
  --color-text-muted: #5a607a;

  --color-primary: #2563eb; /* vibrant blue */
  --color-primary-soft: #e0ecff;
  --color-accent-yellow: #ffd93b;
  --color-accent-purple: #a855f7; /* soft purple */
  --color-accent-green: #10b981; /* emerald green */
  --color-accent-navy: #0b1230; /* dark navy accents */

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2933;
  --gray-900: #111827;

  /* =============================
   * Typography
   * ============================= */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Poppins", var(--font-sans);
  --font-mono: ui-monospace, SFMono-Regular, 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 */
  --font-size-5xl: 3rem;     /* 48px */

  --line-height-tight: 1.15;
  --line-height-snug: 1.3;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* =============================
   * Spacing Scale (0–96px)
   * ============================= */
  --space-0: 0;
  --space-1: 2px;
  --space-2: 4px;
  --space-3: 6px;
  --space-4: 8px;
  --space-5: 10px;
  --space-6: 12px;
  --space-7: 14px;
  --space-8: 16px;
  --space-10: 20px;
  --space-12: 24px;
  --space-16: 32px;
  --space-20: 40px;
  --space-24: 48px;
  --space-28: 56px;
  --space-32: 64px;
  --space-36: 72px;
  --space-40: 80px;
  --space-48: 96px;

  /* =============================
   * Radius
   * ============================= */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  /* =============================
   * Shadows
   * ============================= */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 8px 20px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.18);

  /* =============================
   * Transitions
   * ============================= */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 240ms ease;
}

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

html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

/* Improve text wrapping for Hungarian content */
body {
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

main {
  display: block;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-accent-navy);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-8);
}

h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-6);
}

h3 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-3);
}

h5 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

h6 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

strong {
  font-weight: 600;
}

code,
pre {
  font-family: var(--font-mono);
}

/* Links styled for playful, colorful UI */
a {
  color: var(--color-primary);
  font-weight: 500;
}

a:hover {
  color: var(--color-accent-purple);
}

a:active {
  color: var(--color-accent-yellow);
}

hr {
  border: none;
  border-top: 1px solid var(--gray-200);
  margin: var(--space-16) 0;
}

/* =============================
 * Accessibility & Motion
 * ============================= */
:focus-visible {
  outline: 2px solid var(--color-accent-yellow);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* Layout: container for content pages and hero sections */
.container {
  width: 100%;
  max-width: 1120px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}

@media (max-width: 768px) {
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

/* Flex helpers */
.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;
}

.flex-wrap {
  flex-wrap: wrap;
}

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

.gap-sm {
  gap: var(--space-6);
}

.gap-md {
  gap: var(--space-8);
}

.gap-lg {
  gap: var(--space-12);
}

/* Grid helpers for infographic-like guide layouts */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
}

@media (max-width: 960px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

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

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

.mt-section {
  margin-top: var(--space-32);
}

.mb-section {
  margin-bottom: var(--space-32);
}

.mt-lg {
  margin-top: var(--space-16);
}

.mb-lg {
  margin-bottom: var(--space-16);
}

/* 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;
}

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

/* Buttons – bright, block-like, and playful */
.button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-sm);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-purple));
  color: #ffffff !important;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              background var(--transition-base),
              color var(--transition-fast);
}

.button--primary,
.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-purple));
}

.button--secondary,
.btn--secondary {
  background: var(--color-accent-yellow);
  color: var(--color-accent-navy);
}

.button--ghost,
.btn--ghost {
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-primary) !important;
  box-shadow: var(--shadow-xs);
}

.button:hover,
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.button:disabled,
.btn:disabled,
.button[aria-disabled="true"],
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}

.button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--color-accent-yellow);
  outline-offset: 3px;
}

/* Inputs – forms for search, FAQ, challenge filters */
input[type="text"],
input[type="email"],
input[type="search"],
input[type="number"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  background-color: #ffffff;
  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(--gray-400);
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

/* Card – used across guides, strategy comparisons, achievements */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(148, 163, 184, 0.22);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.card__header {
  margin-bottom: var(--space-4);
}

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

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

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

/* Tag / pill – for difficulty levels, combo labels, achievements */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.tag--easy {
  background-color: rgba(16, 185, 129, 0.12);
  color: var(--color-success);
}

.tag--medium {
  background-color: rgba(245, 158, 11, 0.12);
  color: var(--color-warning);
}

.tag--hard {
  background-color: rgba(239, 68, 68, 0.12);
  color: var(--color-danger);
}

/* Hero section base – for interactive Block Blast hero */
.hero {
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
}

.hero--gradient {
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.22), transparent 55%),
              radial-gradient(circle at bottom right, rgba(168, 85, 247, 0.22), transparent 55%),
              var(--color-bg);
}

.hero__eyebrow {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent-purple);
  margin-bottom: var(--space-3);
}

.hero__title {
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 40rem;
}

/* FAQ / accordion base – for interactive help sections */
.faq-item {
  border-radius: var(--radius-md);
  background-color: #ffffff;
  border: 1px solid var(--gray-200);
  padding: var(--space-4) var(--space-6);
}

.faq-item + .faq-item {
  margin-top: var(--space-4);
}

.faq-item__question {
  font-weight: 600;
  cursor: pointer;
}

.faq-item__answer {
  margin-top: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Achievement / stat highlight – for scoring and streaks */
.stat-tile {
  border-radius: var(--radius-md);
  padding: var(--space-6);
  background: linear-gradient(135deg, #ffffff, #f3f4ff);
  box-shadow: var(--shadow-xs);
}

.stat-tile__label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-500);
  margin-bottom: var(--space-2);
}

.stat-tile__value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-accent-navy);
}

.stat-tile__hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* Helper classes for Block Blast-inspired colorful blocks */
.block-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: var(--font-size-xs);
  color: #ffffff;
  box-shadow: var(--shadow-xs);
}

.block-chip--blue {
  background-color: var(--color-primary);
}

.block-chip--yellow {
  background-color: var(--color-accent-yellow);
  color: var(--color-accent-navy);
}

.block-chip--purple {
  background-color: var(--color-accent-purple);
}

.block-chip--green {
  background-color: var(--color-accent-green);
}

.block-chip--navy {
  background-color: var(--color-accent-navy);
}

/* End of base.css */