/* ===========================================================================
   Variables
   ======================================================================= */
:root {
  /* Colors */
  --color-background: #050816;
  --color-surface: #0b1020;
  --color-surface-elevated: #11182a;
  --color-text: #f4f5ff;
  --color-text-muted: #a9b2d9;
  --color-primary: #3df2ff; /* electric cyan */
  --color-primary-soft: rgba(61, 242, 255, 0.12);
  --color-accent: #7e5cff; /* soft violet */
  --color-accent-soft: rgba(126, 92, 255, 0.16);
  --color-success: #4ade80;
  --color-warning: #facc15;
  --color-danger: #fb7185;
  --color-border-subtle: #212840;

  /* Neutral grays */
  --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, "SF Pro Text",
    "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains 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: 1.1;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.125rem; /* 2px */
  --space-2: 0.25rem;  /* 4px */
  --space-3: 0.375rem; /* 6px */
  --space-4: 0.5rem;   /* 8px */
  --space-6: 0.75rem;  /* 12px */
  --space-8: 1rem;     /* 16px */
  --space-10: 1.25rem; /* 20px */
  --space-12: 1.5rem;  /* 24px */
  --space-16: 2rem;    /* 32px */
  --space-20: 2.5rem;  /* 40px */
  --space-24: 3rem;    /* 48px */
  --space-32: 4rem;    /* 64px */
  --space-40: 5rem;    /* 80px */
  --space-48: 6rem;    /* 96px */

  /* Radius */
  --radius-xs: 0.25rem;  /* 4px */
  --radius-sm: 0.375rem; /* 6px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 0.75rem;  /* 12px */
  --radius-xl: 1rem;     /* 16px */
  --radius-pill: 999px;

  /* Shadows (subtle futuristic glow) */
  --shadow-xs: 0 0 0 1px rgba(15, 23, 42, 0.8);
  --shadow-sm: 0 10px 25px rgba(15, 23, 42, 0.65);
  --shadow-md: 0 16px 40px rgba(15, 23, 42, 0.8);
  --shadow-glow-primary: 0 0 24px rgba(61, 242, 255, 0.45);
  --shadow-glow-accent: 0 0 26px rgba(126, 92, 255, 0.4);

  /* Transitions & motion */
  --transition-fast: 120ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 320ms ease-out;

  /* Layout */
  --container-max-width: 1120px;
  --container-gutter: var(--space-16);
}

@media (max-width: 768px) {
  :root {
    --container-gutter: var(--space-12);
  }
}

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

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

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

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

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

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

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

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

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

textarea {
  resize: vertical;
}

:focus:not(:focus-visible) {
  outline: none;
}

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

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

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

main {
  min-height: 60vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  margin-bottom: var(--space-8);
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  margin-bottom: var(--space-6);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
}

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

p + p {
  margin-top: var(--space-2);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-normal),
    text-shadow var(--transition-normal);
}

a:hover {
  color: var(--color-accent);
  text-shadow: 0 0 12px rgba(61, 242, 255, 0.5);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

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

strong {
  font-weight: 600;
}

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

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

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

/* Layout container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-gutter);
}

.section {
  padding-block: clamp(var(--space-24), 7vw, var(--space-40));
}

.section--alt {
  background: radial-gradient(circle at top left, var(--color-surface) 0,
      var(--color-background) 55%, #020617 100%);
}

/* Flexbox 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-col {
  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 */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-10);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-10);
}

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

/* Alignment and text utilities */
.text-center {
  text-align: center;
}

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

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.6));
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
}

.chip-primary {
  border-color: rgba(61, 242, 255, 0.6);
  background: linear-gradient(135deg, rgba(61, 242, 255, 0.12), rgba(37, 99, 235, 0.05));
  color: var(--color-primary);
}

/* Spacing utilities (margin / padding, selected set) */
.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--space-4); }
.mt-sm { margin-top: var(--space-6); }
.mt-md { margin-top: var(--space-8); }
.mt-lg { margin-top: var(--space-12); }
.mt-xl { margin-top: var(--space-16); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--space-4); }
.mb-sm { margin-bottom: var(--space-6); }
.mb-md { margin-bottom: var(--space-8); }
.mb-lg { margin-bottom: var(--space-12); }
.mb-xl { margin-bottom: var(--space-16); }

.pt-sm { padding-top: var(--space-6); }
.pt-md { padding-top: var(--space-8); }
.pt-lg { padding-top: var(--space-12); }
.pb-sm { padding-bottom: var(--space-6); }
.pb-md { padding-bottom: var(--space-8); }
.pb-lg { padding-bottom: var(--space-12); }

/* 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;
}

/* Focus-visible outline utility for custom components */
.focus-ring:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: inherit;
}

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

/* Buttons */
.button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  color: #0b1020;
  box-shadow: var(--shadow-sm);
}

.button--primary,
.btn--primary {
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  color: #020617 !important;
}

.button--outline,
.btn--outline {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(148, 163, 184, 0.7);
  color: var(--color-text);
}

.button--ghost,
.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-primary);
}

.button--danger,
.btn--danger {
  background: linear-gradient(135deg, #fb7185, #f97316);
  color: #020617;
}

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

.button--outline:hover,
.btn--outline:hover {
  border-color: var(--color-primary);
  background: radial-gradient(circle at top left, rgba(61, 242, 255, 0.18), rgba(15, 23, 42, 0.95));
}

.button--ghost:hover,
.btn--ghost:hover {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(148, 163, 184, 0.6);
}

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

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

/* Inputs & forms */
.input,
textarea,
select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(15, 23, 42, 0.9);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition: border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-normal),
    transform var(--transition-fast);
}

.input::placeholder,
textarea::placeholder {
  color: rgba(148, 163, 184, 0.7);
}

.input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(61, 242, 255, 0.4), var(--shadow-glow-primary);
  background-color: rgba(15, 23, 42, 0.98);
}

.input--error {
  border-color: var(--color-danger);
}

.input--error:focus-visible {
  box-shadow: 0 0 0 1px rgba(251, 113, 133, 0.7);
}

label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.form-field {
  margin-bottom: var(--space-6);
}

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

/* Cards */
.card {
  position: relative;
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(30, 64, 175, 0.7);
  background:
    radial-gradient(circle at 0 0, rgba(61, 242, 255, 0.12), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(126, 92, 255, 0.18), transparent 55%),
    linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.98));
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(18px);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal),
    border-color var(--transition-normal),
    background var(--transition-slow);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow-accent);
  border-color: rgba(61, 242, 255, 0.7);
}

.card--muted {
  border-color: rgba(31, 41, 55, 0.8);
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.99));
}

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

.card-title {
  font-size: var(--font-size-lg);
  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);
}

/* Media frame for screenshots / puzzle illustrations */
.media-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: radial-gradient(circle at top left, rgba(61, 242, 255, 0.18), rgba(15, 23, 42, 1));
  box-shadow: var(--shadow-sm);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
    135deg,
    rgba(61, 242, 255, 0.06) 0%,
    transparent 40%,
    rgba(126, 92, 255, 0.12) 100%
  );
  mix-blend-mode: screen;
  pointer-events: none;
}

/* Navigation (generic, can be extended per page) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(90deg, rgba(5, 8, 22, 0.94), rgba(5, 8, 22, 0.86));
  border-bottom: 1px solid rgba(15, 23, 42, 0.9);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding-block: var(--space-4);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding-block: 0.2rem;
  transition: color var(--transition-normal);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-text);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

/* Pills for difficulty / modes (Tryby gry, Poziomy i wyzwania) */
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  background-color: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.6);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.pill--active {
  border-color: rgba(61, 242, 255, 0.9);
  background: linear-gradient(135deg, rgba(61, 242, 255, 0.18), rgba(126, 92, 255, 0.16));
  color: var(--color-primary);
  box-shadow: var(--shadow-glow-primary);
}

/* Callout / info box (Porady, FAQ, Aktualizacje) */
.callout {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(59, 130, 246, 0.6);
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.98));
  padding: var(--space-8);
}

.callout--success { border-color: rgba(74, 222, 128, 0.7); }
.callout--warning { border-color: rgba(250, 204, 21, 0.8); }
.callout--danger  { border-color: rgba(248, 113, 113, 0.8); }

/* FAQ accordion basics */
.faq-item {
  border-radius: var(--radius-md);
  border: 1px solid rgba(31, 41, 55, 0.9);
  background-color: rgba(15, 23, 42, 0.98);
  padding: var(--space-6);
}

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

.faq-answer {
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Chips for meta info (Blog, Aktualizacje) */
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  background-color: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(30, 64, 175, 0.8);
}

/* Tag list */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.tag {
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
  background-color: rgba(15, 23, 42, 0.98);
  border: 1px dashed rgba(148, 163, 184, 0.7);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Progress indicator (level progression feel) */
.progress-bar {
  position: relative;
  width: 100%;
  height: 0.4rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.95);
  overflow: hidden;
}

.progress-bar__fill {
  position: absolute;
  inset: 0;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 0 18px rgba(61, 242, 255, 0.6);
}

/* Status dots (e.g., difficulty, daily challenges) */
.status-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 999px;
  background-color: var(--color-primary);
  box-shadow: 0 0 10px rgba(61, 242, 255, 0.9);
}

.status-dot--success {
  background-color: var(--color-success);
  box-shadow: 0 0 10px rgba(74, 222, 128, 0.9);
}

.status-dot--danger {
  background-color: var(--color-danger);
  box-shadow: 0 0 10px rgba(248, 113, 113, 0.9);
}

/* Accessibility: focus-visible for generic interactive elements */
button:focus-visible,
[role="button"]:focus-visible,
[tabindex]:not([tabindex="-1"]):focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===========================================================================
   End base.css
   ======================================================================= */