/*
  Tetrofall website styles.
  Palette, type scale and shadows are ported from the game's own
  screens/tokens.css so the site matches the in-app wood/gold look
  instead of a generic web theme.

  Webfonts are requested from each page's <head> (preconnect + stylesheet
  link) rather than with an @import here, which would delay the request
  until this file has parsed.
*/

:root {
  color-scheme: dark;

  --color-wood-dark: #4a2f1c;
  --color-wood-mid: #7a5230;
  --color-wood-light: #c89b6a;
  --color-bg: #2b1c12;
  --color-panel: rgba(255, 255, 255, 0.06);
  --color-panel-strong: rgba(255, 255, 255, 0.09);
  --color-panel-border: rgba(255, 255, 255, 0.1);
  --color-gold: #f2b632;
  --color-red: #d9432e;
  --color-blue: #3aa0d9;
  --color-text: #f5ead9;
  --color-text-muted: #b9a889;

  --font-display: 'Baloo 2', 'Trebuchet MS', ui-rounded, system-ui, sans-serif;
  --font-body: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Fluid type scale. Every step interpolates between a 320px phone and a
     1200px desktop, so nothing jumps at a breakpoint. */
  --step--1: clamp(0.82rem, 0.79rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.075rem);
  --step-1: clamp(1.1rem, 1.03rem + 0.35vw, 1.3rem);
  --step-2: clamp(1.3rem, 1.16rem + 0.7vw, 1.7rem);
  --step-3: clamp(1.7rem, 1.4rem + 1.5vw, 2.5rem);
  --step-4: clamp(2.1rem, 1.6rem + 2.6vw, 3.4rem);

  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lift: 0 8px 20px rgba(0, 0, 0, 0.45);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  /* Two content widths: the marketing pages breathe, the legal and support
     prose stays at a readable measure. */
  --width-wide: 1080px;
  --width-prose: 68ch;
  --gutter: clamp(1rem, 4vw, 2rem);

  /* Height of the sticky header, used to keep anchored headings clear of it. */
  --header-height: 4.5rem;

  --bg-wood-texture:
    repeating-linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.08) 0px,
      rgba(0, 0, 0, 0.08) 2px,
      transparent 2px,
      transparent 18px
    ),
    linear-gradient(180deg, var(--color-wood-dark) 0%, var(--color-bg) 100%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  /* Anchors land below the sticky header instead of underneath it. */
  scroll-padding-top: calc(var(--header-height) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--color-bg);
  background-image: var(--bg-wood-texture);
  /* Not `fixed`: a fixed attachment repaints the whole viewport on every
     scroll frame on mobile Safari and Chrome Android. */
  background-repeat: no-repeat;
  background-size: 100% 100vh;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

/* Shared page container. Header, main and footer all sit on the same
   gutters, and `env()` keeps content out of the notch in landscape. */
.container {
  width: 100%;
  max-width: var(--width-wide);
  margin: 0 auto;
  padding-inline: max(var(--gutter), env(safe-area-inset-left), env(safe-area-inset-right));
}

.container-prose {
  max-width: var(--width-prose);
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-gold);
  color: var(--color-wood-dark);
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 700;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

a {
  color: var(--color-gold);
}

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

h1, h2, h3, .font-display {
  font-family: var(--font-display);
  margin: 0;
  line-height: 1.2;
}

/* Header */
header {
  border-bottom: 1px solid var(--color-panel-border);
  background: rgba(0, 0, 0, 0.18);
  position: sticky;
  top: 0;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 10;
}

.nav-inner {
  min-height: var(--header-height);
  padding-block: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.brand img {
  width: 32px;
  height: 32px;
  display: block;
}

.brand span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

/* One row that scrolls sideways on a narrow phone rather than wrapping
   under the brand and doubling the header height. `min-width: 0` is what
   lets the flex item shrink far enough for the scroll to engage; without
   it the row simply pushes the page wider than the viewport. */
header nav {
  min-width: 0;
  display: flex;
  justify-content: flex-end;
}

header nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

header nav ul::-webkit-scrollbar {
  display: none;
}

header nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  white-space: nowrap;
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--step--1);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-pill);
  transition: background 0.15s ease, color 0.15s ease;
}

header nav a:hover,
header nav a:focus-visible {
  color: var(--color-text);
  background: var(--color-panel);
}

header nav a[aria-current="page"] {
  color: var(--color-wood-dark);
  background: var(--color-gold);
}

/* Main content */
main {
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
}

/* Keep any anchored element clear of the sticky header when linked to. */
[id] {
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.hero {
  text-align: center;
  padding: clamp(2rem, 7vw, 4rem) 0 clamp(1.5rem, 5vw, 3rem);
}

.hero img {
  width: clamp(96px, 22vw, 144px);
  height: auto;
  filter: drop-shadow(var(--shadow-lift));
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: var(--step-4);
  letter-spacing: 0.01em;
}

.hero-lead {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-2);
  color: var(--color-text);
  max-width: 22ch;
  margin: 0.9rem auto 0;
  text-wrap: balance;
}

.tagline {
  color: var(--color-text-muted);
  font-size: var(--step-1);
  max-width: 52ch;
  margin: 0.75rem auto 0;
  text-wrap: pretty;
}

/* Same lead paragraph, flush left, for the document pages. */
.tagline-start {
  margin-inline: 0;
}

h1.page-title {
  font-size: var(--step-3);
  padding-top: clamp(1.75rem, 5vw, 3rem);
}

.updated {
  display: inline-block;
  color: var(--color-text-muted);
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.9rem;
  font-size: var(--step--1);
  margin: 0.75rem 0 1.75rem;
}

section {
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

section h2 {
  font-size: var(--step-2);
  margin-bottom: 1rem;
}

p {
  text-wrap: pretty;
}

/* Buttons */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.btn-primary {
  padding: 0.9rem 1.9rem;
  border: none;
  background: linear-gradient(180deg, var(--color-gold) 0%, #d99a1f 100%);
  color: var(--color-wood-dark);
  font-size: var(--step-0);
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-1px);
}

.btn-secondary {
  padding: 0.8rem 1.6rem;
  border: 2px solid var(--color-panel-border);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: var(--step--1);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.cta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-top: clamp(1.25rem, 4vw, 2rem);
}

/* Status chip, not a button: nothing here is clickable yet. */
.badge-soon {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(242, 182, 50, 0.35);
  background: rgba(242, 182, 50, 0.1);
  color: var(--color-gold);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step--1);
  letter-spacing: 0.02em;
}

.badge-soon::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-gold);
  box-shadow: 0 0 0 4px rgba(242, 182, 50, 0.18);
}

.cta-note {
  color: var(--color-text-muted);
  font-size: var(--step--1);
}

/* Cards / panels */
.panel {
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: clamp(1.1rem, 3vw, 1.75rem);
}

.panel > :first-child {
  margin-top: 0;
}

.panel > :last-child {
  margin-bottom: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.feature-card {
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-md);
  padding: clamp(1.1rem, 2.5vw, 1.4rem);
  box-shadow: var(--shadow-soft);
}

.feature-card .feature-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: rgba(242, 182, 50, 0.15);
  color: var(--color-gold);
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.feature-card h3 {
  font-size: var(--step-1);
  margin-bottom: 0.4rem;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: var(--step--1);
  margin: 0;
}

/* How to play */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  position: relative;
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.25rem 1.25rem 3.75rem;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 1.25rem;
  top: 1.15rem;
  width: 1.9rem;
  height: 1.9rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: rgba(242, 182, 50, 0.15);
  color: var(--color-gold);
  font-family: var(--font-display);
  font-weight: 700;
}

.steps strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--step-1);
}

.steps span {
  color: var(--color-text-muted);
  font-size: var(--step--1);
}

/* Lists */
ul.plain {
  padding-left: 1.25rem;
  margin: 0;
}

ul.plain li {
  margin-bottom: 0.55rem;
}

ul.plain li:last-child {
  margin-bottom: 0;
}

ul.plain li strong {
  color: var(--color-text);
}

ol.plain {
  padding-left: 1.35rem;
  margin: 0;
}

ol.plain li {
  margin-bottom: 0.4rem;
}

ol.plain li:last-child {
  margin-bottom: 0;
}

/* Term/definition blocks: the AdMob data disclosure and the third-party list */
.data-list {
  margin: 0;
}

.data-list dt {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-text);
  margin-top: 1.1rem;
}

.data-list dt:first-child {
  margin-top: 0;
}

.data-list dd {
  margin: 0.15rem 0 0;
  color: var(--color-text-muted);
  font-size: var(--step--1);
}

/* Privacy page: table of contents */
.privacy-layout {
  display: block;
}

/* Long-form body copy keeps a readable measure even when the page
   container around it is wide. */
.prose {
  max-width: var(--width-prose);
  min-width: 0;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  list-style: none;
  margin: 0 0 2rem;
}

.toc a {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--step--1);
  font-weight: 700;
}

.toc a:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.toc-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: 0 0 0.75rem;
}

/* A linked section marks itself so you can see where you landed. */
section:target > h2 {
  color: var(--color-gold);
}

section:target > h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1em;
  margin-right: 0.55rem;
  vertical-align: -0.1em;
  border-radius: 2px;
  background: var(--color-gold);
}

.to-top {
  display: none;
  margin-top: 1rem;
  font-size: var(--step--1);
  color: var(--color-text-muted);
  text-decoration: none;
}

.to-top:hover {
  color: var(--color-gold);
}

/* Support page */
.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.contact-card p {
  margin: 0;
  color: var(--color-text-muted);
}

/* FAQ accordions */
.faq details {
  border-bottom: 1px solid var(--color-panel-border);
}

.faq details:last-of-type {
  border-bottom: none;
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
  padding: 0.9rem 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-1);
  color: var(--color-text);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: rgba(242, 182, 50, 0.15);
  color: var(--color-gold);
  font-size: 1.1rem;
  line-height: 1;
}

.faq details[open] summary::after {
  content: "\2013";
}

.faq summary:hover {
  color: var(--color-gold);
}

.faq .answer {
  color: var(--color-text-muted);
  font-size: var(--step--1);
  padding: 0 0 1rem;
  margin: 0;
  max-width: 62ch;
}

.faq .answer + .answer {
  padding-top: 0;
  margin-top: -0.5rem;
}

/* Centred pages (404) */
.page-center {
  text-align: center;
  padding-top: clamp(2.5rem, 8vw, 5rem);
}

.page-center img {
  width: clamp(80px, 20vw, 112px);
  filter: drop-shadow(var(--shadow-lift));
}

.page-center h1 {
  padding-top: 1rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--color-panel-border);
  padding-block: 2rem 2.5rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-studio {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--step--1);
}

.footer-studio img {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-pill);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: var(--step--1);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-gold);
}

/* ---- Breakpoints ---------------------------------------------------- */

@media (min-width: 40em) {
  .feature-grid,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 56em) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .steps {
    grid-template-columns: repeat(3, 1fr);
  }

  /* The table of contents becomes a sticky sidebar once there is room
     for one beside the prose. */
  .privacy-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 15rem;
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .privacy-layout .toc-wrap {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
    order: 2;
  }

  .privacy-layout .prose {
    order: 1;
    min-width: 0;
  }

  .toc {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.15rem;
    margin-bottom: 0;
  }

  .toc a {
    display: block;
    background: none;
    border: none;
    border-left: 2px solid var(--color-panel-border);
    border-radius: 0;
    padding: 0.4rem 0.85rem;
  }

  .toc a:hover {
    border-left-color: var(--color-gold);
  }

  .to-top {
    display: inline-block;
  }
}

@media (max-width: 30em) {
  .footer-inner,
  .contact-card {
    flex-direction: column;
    text-align: center;
  }

  /* Buy back enough width for all three links to sit in the row. */
  header nav a {
    padding-inline: 0.6rem;
  }

  .brand span {
    font-size: 1.05rem;
  }
}

/* Below this the row genuinely has to scroll, so fade its right edge to
   show there is more to reach. */
@media (max-width: 22.5em) {
  header nav ul {
    mask-image: linear-gradient(90deg, #000 calc(100% - 1.5rem), transparent);
    -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 1.5rem), transparent);
  }
}

/* ---- Accessibility and print ---------------------------------------- */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .btn-primary:hover {
    transform: none;
  }
}

/* The privacy policy is a document people print or save as a PDF. */
@media print {
  html,
  body {
    background: #fff;
    color: #000;
  }

  header,
  footer,
  .toc-wrap,
  .skip-link,
  .to-top,
  .contact-card .btn-secondary {
    display: none !important;
  }

  .container {
    max-width: none;
    padding: 0;
  }

  .privacy-layout {
    display: block;
  }

  .panel,
  .feature-card {
    border: 1px solid #999;
    box-shadow: none;
    break-inside: avoid;
  }

  .updated,
  .tagline,
  .data-list dd,
  .feature-card p,
  .faq .answer {
    color: #333;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  main a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    word-break: break-all;
  }

  .faq details {
    /* Print every answer, opened or not. */
    display: block;
  }

  .faq .answer {
    display: block;
  }
}