/* =========================================
   Variables
   ========================================= */
:root {
  /* Colors */
  --color-background: #05060a; /* deep, almost-black blue */
  --color-background-elevated: #0d0f18;
  --color-background-soft: #151827;
  --color-text: #e5e7f2;
  --color-text-muted: #9ca3c7;
  --color-primary: #8ab4ff; /* cool, subtle highlight */
  --color-primary-soft: rgba(138, 180, 255, 0.16);
  --color-success: #4ade80;
  --color-warning: #facc15;
  --color-danger: #fb7185;

  --color-gray-50: #0b0c12;
  --color-gray-100: #141624;
  --color-gray-200: #1f2234;
  --color-gray-300: #252845;
  --color-gray-400: #4b4f73;
  --color-gray-500: #6b7280;
  --color-gray-600: #9ca3af;
  --color-gray-700: #d1d5db;
  --color-gray-800: #e5e7eb;
  --color-gray-900: #f9fafb;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-serif: "Cormorant Garamond", "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Base font sizes & line heights */
  --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: 1.6;
  --line-height-relaxed: 1.8;

  /* 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-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-pill: 999px;

  /* Shadows (subtle, volumetric for mystery atmosphere) */
  --shadow-soft: 0 8px 20px rgba(0, 0, 0, 0.45);
  --shadow-deep: 0 18px 45px rgba(0, 0, 0, 0.8);
  --shadow-glow-primary: 0 0 22px rgba(138, 180, 255, 0.35);

  /* Borders */
  --border-subtle: 1px solid rgba(148, 163, 184, 0.18);

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

  /* Layout */
  --container-width: 1120px;
  --container-padding-x: 1.25rem;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0s;
    --transition-normal: 0s;
    --transition-slow: 0s;
  }
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

* {
  margin: 0;
}

html,
body {
  height: 100%;
}

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

body {
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  padding: 0;
}

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

/* =========================================
   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);
  text-rendering: optimizeLegibility;
}

main {
  min-height: calc(100vh - 5rem);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

h1 {
  font-size: clamp(2.4rem, 2.2rem + 1vw, 3rem);
  letter-spacing: 0.03em;
}

h2 {
  font-size: clamp(2rem, 1.8rem + 0.6vw, 2.4rem);
}

h3 {
  font-size: 1.6rem;
}

h4 {
  font-size: 1.3rem;
}

h1,
.h1,
h2,
.h2,
h3,
.h3,
h4,
.h4 {
  margin-bottom: var(--space-4);
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  text-underline-offset: 0.18em;
  transition: color var(--transition-fast),
    text-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

a:hover {
  color: #c4d5ff;
  text-shadow: 0 0 12px rgba(138, 180, 255, 0.45);
}

a:active {
  color: #e5e9ff;
}

strong,
b {
  font-weight: 600;
}

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

hr {
  border: 0;
  border-top: 1px solid rgba(148, 163, 184, 0.25);
  margin: var(--space-8) 0;
}

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

::-moz-selection {
  background: var(--color-primary-soft);
  color: var(--color-text);
}

::selection {
  background: var(--color-primary-soft);
  color: var(--color-text);
}

/* Screen reader only utility */
.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;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* =========================================
   Layout Utilities
   ========================================= */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding-x);
  padding-right: var(--container-padding-x);
}

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section--tight {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

/* 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;
}

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

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

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

/* Grid helpers */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Spacing utilities (limited set for base) */
.mt-0 { margin-top: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-8 { margin-top: var(--space-8) !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-8 { margin-bottom: var(--space-8) !important; }

.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: radial-gradient(circle at top left,
      rgba(148, 163, 184, 0.18),
      rgba(15, 23, 42, 0.9));
  color: var(--color-text);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1;
  cursor: pointer;
  transition:
    background-color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast),
    color var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg,
      rgba(138, 180, 255, 0.18),
      rgba(15, 23, 42, 0.98));
  border-color: rgba(138, 180, 255, 0.65);
  box-shadow: var(--shadow-soft);
}

.btn-ghost {
  background: rgba(15, 23, 42, 0.8);
  border-color: rgba(148, 163, 184, 0.35);
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-deep);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg,
      rgba(138, 180, 255, 0.33),
      rgba(15, 23, 42, 1));
}

.btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-soft);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-icon {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border-radius: 999px;
}

/* Form elements */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background-color: rgba(15, 23, 42, 0.95);
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.4;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

textarea {
  min-height: 7rem;
  resize: vertical;
}

input::placeholder,
textarea::placeholder {
  color: rgba(148, 163, 184, 0.6);
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  border-color: rgba(138, 180, 255, 0.9);
  box-shadow: 0 0 0 1px rgba(138, 180, 255, 0.7), var(--shadow-soft);
}

input:disabled,
textarea:disabled,
select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Card - for sections like tips, story, guides */
.card {
  position: relative;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at top center,
      rgba(15, 23, 42, 0.9),
      rgba(3, 7, 18, 0.98));
  border: var(--border-subtle);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 10% 0%,
      rgba(148, 163, 184, 0.08),
      transparent 55%);
  opacity: 0.9;
  pointer-events: none;
}

.card__content {
  position: relative;
}

.card--soft {
  background: linear-gradient(145deg,
      rgba(15, 23, 42, 0.9),
      rgba(15, 23, 42, 0.98));
  box-shadow: none;
}

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

.card-title {
  margin: 0 0 var(--space-2);
}

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

/* Hero / atmospheric helpers */
.hero {
  position: relative;
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
  background: radial-gradient(circle at top,
      rgba(15, 23, 42, 0.65),
      rgba(3, 7, 18, 0.98));
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(30, 64, 175, 0.16), transparent 55%),
    radial-gradient(circle at 80% 10%, rgba(148, 163, 184, 0.13), transparent 55%),
    radial-gradient(circle at 60% 80%, rgba(15, 23, 42, 0.9), transparent 65%);
  mix-blend-mode: screen;
  opacity: 0.85;
  pointer-events: none;
}

.hero__inner {
  position: relative;
  max-width: 720px;
}

.hero-kicker {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

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

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 32rem;
}

/* Tag / label, e.g., for puzzle difficulty or category */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.1rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background-color: rgba(15, 23, 42, 0.9);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.tag--primary {
  border-color: rgba(138, 180, 255, 0.7);
  color: var(--color-primary);
}

/* Navigation (shared for all pages: Strona główna, O grze, Poradnik, etc.) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(to bottom,
      rgba(5, 6, 10, 0.98),
      rgba(5, 6, 10, 0.9),
      rgba(5, 6, 10, 0.8),
      transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.navbar-brand {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
}

.nav-link:hover {
  color: var(--color-text);
  border-bottom-color: rgba(148, 163, 184, 0.7);
}

.nav-link--active {
  color: var(--color-primary);
  border-bottom-color: rgba(138, 180, 255, 0.85);
}

@media (max-width: 768px) {
  .navbar-menu {
    gap: var(--space-3);
  }

  .navbar {
    height: auto;
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
    flex-wrap: wrap;
    row-gap: var(--space-3);
  }
}

/* Footer */
.site-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.25);
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  background: radial-gradient(circle at top,
      rgba(15, 23, 42, 0.55),
      rgba(5, 6, 10, 1));
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* =========================================
   Page-specific subtle helpers (optional)
   ========================================= */

/* For puzzle tips / guide lists */
.list-check {
  list-style: none;
  padding-left: 0;
}

.list-check li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
}

.list-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(148, 163, 184, 0.8);
  background: radial-gradient(circle,
      rgba(138, 180, 255, 0.9),
      rgba(15, 23, 42, 1));
}

/* For callouts, e.g., story highlights or warnings */
.callout {
  border-radius: var(--radius-md);
  border-left: 3px solid rgba(138, 180, 255, 0.8);
  padding: var(--space-4);
  background: rgba(15, 23, 42, 0.9);
  font-size: var(--font-size-sm);
}

.callout--warning {
  border-left-color: rgba(250, 204, 21, 0.9);
}

.callout--danger {
  border-left-color: rgba(248, 113, 113, 0.9);
}