/* =========================================================
   Palette & fonts: change these tokens to re-theme the page.
   Base colours: #222831 · #393E46 · #948979 · #DFD0B8
   ========================================================= */
:root {
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Light theme (default) */
  --bg: #efe6d6;             /* lightened #DFD0B8 */
  --bg-deep: #dfd0b8;        /* original cream */
  --surface: #fbf7f0;
  --surface-2: #f3ebdd;
  --text: #222831;
  --text-muted: #4a4f57;
  --accent: #222831;         /* button background */
  --on-accent: #dfd0b8;      /* text on button */
  --accent-2: #948979;       /* decoration, borders, glow (not for text) */
  --accent-text: #5e5648;    /* darker #948979 so it passes 4.5:1 as text */
  --border: #cbbba0;
  --field: #fffdf9;
  --field-border: #857a68;   /* 3:1+ against the field, as WCAG asks for inputs */
  --focus: #5e5648;
  --danger: #9b2c2c;
  --success: #2f6b3f;
  --shadow: rgba(34, 40, 49, 0.14);
  --shadow-strong: rgba(34, 40, 49, 0.26);
  --ripple: rgba(223, 208, 184, 0.45);
  --print: #948979;
  --glow-a: #dfd0b8;
  --glow-b: #948979;

  --radius: 22px;
  --radius-sm: 12px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Dark theme: tints of the same palette, not plain black & white */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #222831;
    --bg-deep: #1a1f26;
    --surface: #2c323b;
    --surface-2: #393e46;
    --text: #dfd0b8;
    --text-muted: #b8ad9b;
    --accent: #dfd0b8;
    --on-accent: #222831;
    --accent-2: #948979;
    --accent-text: #c4b59d;
    --border: #4a505a;
    --field: #222831;
    --field-border: #8a919b;
    --focus: #c4b59d;
    --danger: #f0a3a3;
    --success: #9fd4ad;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-strong: rgba(0, 0, 0, 0.5);
    --ripple: rgba(34, 40, 49, 0.3);
    --print: #948979;
    --glow-a: #393e46;
    --glow-b: #948979;
  }
}

:root[data-theme='dark'] {
  --bg: #222831;
  --bg-deep: #1a1f26;
  --surface: #2c323b;
  --surface-2: #393e46;
  --text: #dfd0b8;
  --text-muted: #b8ad9b;
  --accent: #dfd0b8;
  --on-accent: #222831;
  --accent-2: #948979;
  --accent-text: #c4b59d;
  --border: #4a505a;
  --field: #222831;
  --field-border: #8a919b;
  --focus: #c4b59d;
  --danger: #f0a3a3;
  --success: #9fd4ad;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-strong: rgba(0, 0, 0, 0.5);
  --ripple: rgba(34, 40, 49, 0.3);
  --print: #948979;
  --glow-a: #393e46;
  --glow-b: #948979;
}

/* ---------- Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  margin: 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.1em 0.35em;
  border-radius: 6px;
  background: var(--surface-2);
}

a {
  color: var(--accent-text);
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 6px;
}

[hidden] {
  display: none !important;
}

main:focus {
  outline: none;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 100;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- Living background ---------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.backdrop__print {
  position: absolute;
  width: min(900px, 140vw);
  right: -18%;
  top: 50%;
  margin-top: calc(min(900px, 140vw) / -2);
  color: var(--print);
  opacity: 0.35;
  animation: print-spin 90s linear infinite;
}

.backdrop__print ellipse:nth-child(odd) {
  animation: print-breathe 7s var(--ease) infinite alternate;
  transform-origin: 300px 300px;
}

.backdrop__glow {
  position: absolute;
  width: 46vmax;
  height: 46vmax;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
}

.backdrop__glow--a {
  background: var(--glow-a);
  left: -16vmax;
  top: -14vmax;
  animation: drift-a 26s ease-in-out infinite alternate;
}

.backdrop__glow--b {
  background: var(--glow-b);
  left: 30%;
  bottom: -30vmax;
  opacity: 0.25;
  animation: drift-b 32s ease-in-out infinite alternate;
}

@keyframes print-spin {
  to { transform: rotate(360deg); }
}

@keyframes print-breathe {
  from { transform: scale(1); opacity: 1; }
  to { transform: scale(1.04); opacity: 0.45; }
}

@keyframes drift-a {
  to { transform: translate(12vmax, 8vmax) scale(1.1); }
}

@keyframes drift-b {
  to { transform: translate(-10vmax, -6vmax) scale(0.9); }
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.25rem 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text);
  text-decoration: none;
}

.brand b {
  color: var(--accent-text);
}

.brand__mark {
  width: 30px;
  height: 30px;
  fill: var(--text);
  stroke: var(--accent-2);
  stroke-linecap: round;
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.mode-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.7rem;
  border: 1px dashed var(--accent-2);
  border-radius: 999px;
  color: var(--text-muted);
  white-space: nowrap;
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.theme-toggle:hover {
  transform: translateY(-2px) rotate(-12deg);
  box-shadow: 0 8px 18px var(--shadow);
}

.theme-toggle svg {
  grid-area: 1 / 1;
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  transition: transform 0.4s var(--ease), opacity 0.3s;
}

.icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.5); }

:root[data-theme='dark'] .icon-sun { opacity: 0; transform: rotate(90deg) scale(0.5); }
:root[data-theme='dark'] .icon-moon { opacity: 1; transform: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .icon-sun { opacity: 0; transform: rotate(90deg) scale(0.5); }
  :root:not([data-theme='light']) .icon-moon { opacity: 1; transform: none; }
}

/* ---------- Hero ---------- */
main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1rem 4rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  min-height: calc(100vh - 90px);
  padding: 2rem 0 3rem;
}

.eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-text);
}

.hero h1 {
  font-size: clamp(2.6rem, 6.4vw, 4.8rem);
  letter-spacing: -0.02em;
}

.hero h1 em {
  font-style: italic;
  font-weight: 500;
  color: var(--accent-text);
}

.lead {
  max-width: 34ch;
  margin: 1.25rem 0 2rem;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}

.stat {
  min-width: 118px;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--accent-2);
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  box-shadow: 0 4px 14px var(--shadow);
}

.stat dt {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat small {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ---------- Vault (auth card) ---------- */
.vault {
  position: relative;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  /* notched "keycard" corner */
  border-radius: var(--radius) var(--radius) var(--radius) 6px;
  box-shadow: 0 30px 60px -20px var(--shadow-strong), 0 0 0 8px var(--surface-2);
}

.vault::before {
  /* keyhole punched into the card */
  content: '';
  position: absolute;
  top: -8px;
  right: 34px;
  width: 16px;
  height: 26px;
  border-radius: 8px 8px 3px 3px;
  background: var(--bg);
  box-shadow: inset 0 2px 4px var(--shadow);
}

.vault__tabs {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 5px;
  margin-bottom: 1.5rem;
  border-radius: 999px;
  background: var(--surface-2);
}

.vault__tab {
  position: relative;
  z-index: 1;
  padding: 0.7rem 0.5rem;
  border: 0;
  border-radius: 999px;
  background: none;
  font: 600 0.95rem var(--font-body);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.3s var(--ease);
}

.vault__tab[aria-selected='true'] {
  color: var(--on-accent);
}

.vault__slider {
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 5px;
  width: calc(50% - 5px);
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 6px 14px var(--shadow);
  transition: transform 0.45s var(--ease);
}

.vault[data-view='register'] .vault__slider {
  transform: translateX(100%);
}

.panel {
  display: grid;
  gap: 1rem;
  animation: panel-in 0.45s var(--ease);
}

@keyframes panel-in {
  from { opacity: 0; transform: translateY(10px); }
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field label {
  font-size: 0.9rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  padding: 0.8rem 0.95rem;
  border: 1.5px solid var(--field-border);
  border-radius: var(--radius-sm);
  background: var(--field);
  font: 400 1rem var(--font-body);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field input::placeholder {
  color: var(--text-muted);
  opacity: 0.75;
}

.field input:focus-visible {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 4px var(--surface-2), 0 0 0 5.5px var(--focus);
}

.field input[aria-invalid='true'] {
  border-color: var(--danger);
}

.hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.strength {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}

.strength__bar {
  display: block;
  height: 100%;
  background: var(--focus);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 0.35s var(--ease);
}

/* ---------- Buttons ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 1.4rem;
  border: 0;
  border-radius: var(--radius-sm) var(--radius-sm) var(--radius-sm) 4px;
  font: 600 1rem var(--font-body);
  cursor: pointer;
  box-shadow: 0 6px 16px var(--shadow);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

/* keeps the pointer "on" the button while it lifts, so it does not jitter */
.btn::after {
  content: '';
  position: absolute;
  inset: 0 0 -6px;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 26px var(--shadow-strong);
}

.btn:active {
  transform: translateY(1px);
  box-shadow: 0 3px 8px var(--shadow);
}

.btn--primary {
  margin-top: 0.4rem;
  background: var(--accent);
  color: var(--on-accent);
}

.btn--ghost {
  background: var(--surface-2);
  color: var(--text);
}

.btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* lock micro-effect: shackle lifts on hover, pops open on success */
.lock__shackle {
  transition: transform 0.3s var(--ease);
}

.btn:hover .lock__shackle {
  transform: translateY(-2px);
}

.btn.is-unlocked .lock__shackle {
  transform: translate(3px, -3px) rotate(18deg);
  transform-origin: 16px 11px;
}

.key {
  transition: transform 0.4s var(--ease);
}

.btn:hover .key {
  transform: rotate(-20deg);
}

.btn__ink {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  overflow: hidden;
  pointer-events: none;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: var(--ripple);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

@keyframes ripple {
  to { transform: scale(4); opacity: 0; }
}

/* ---------- Welcome state ---------- */
.welcome {
  display: grid;
  justify-items: center;
  gap: 0.6rem;
  text-align: center;
  animation: panel-in 0.5s var(--ease);
}

.welcome__avatar circle {
  fill: var(--accent);
}

.welcome__avatar text {
  fill: var(--on-accent);
  font: 700 26px var(--font-display);
  text-anchor: middle;
  dominant-baseline: middle;
}

.welcome__hello {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.welcome__note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.welcome__hash {
  display: block;
  max-width: 100%;
  padding: 0.7rem;
  word-break: break-all;
  text-align: left;
  font-size: 0.78rem;
}

.message {
  min-height: 1.5em;
  margin: 1rem 0 0;
  font-size: 0.92rem;
  font-weight: 500;
}

.message.is-error { color: var(--danger); }
.message.is-ok { color: var(--success); }

.vault.is-shaking {
  animation: shake 0.4s;
}

@keyframes shake {
  25% { transform: translateX(-6px); }
  50% { transform: translateX(6px); }
  75% { transform: translateX(-3px); }
}

/* ---------- How it works ---------- */
.how h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 1.5rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  position: relative;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) var(--radius) 6px;
  box-shadow: 0 6px 18px var(--shadow);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), opacity 0.6s var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 36px var(--shadow-strong);
}

.card__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-text);
}

.card h3 {
  margin: 0.5rem 0;
  font-size: 1.3rem;
}

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

.footer {
  padding: 2rem 1rem 3rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Reveal on scroll ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.cards .reveal:nth-child(2) { transition-delay: 0.1s; }
.cards .reveal:nth-child(3) { transition-delay: 0.2s; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: 1rem;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .vault {
    padding: 1.1rem;
  }

  .mode-badge {
    font-size: 0.68rem;
    padding: 0.3rem 0.55rem;
  }

  .stat {
    min-width: 0;
    flex: 1 1 90px;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}