*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Skip link (keyboard / screen reader) ── */
.skip-link {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  position: fixed;
  top: 0.65rem;
  left: 0.65rem;
  z-index: 10000;
  width: auto;
  height: auto;
  margin: 0;
  padding: 0.65rem 1.15rem;
  clip: auto;
  overflow: visible;
  white-space: nowrap;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  box-shadow: var(--shadow-card);
}

@media (min-width: 900px) {
  .skip-link:focus {
    left: calc(216px + 0.65rem);
  }
}

:root {
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "Consolas", monospace;
  --bg: #07090e;
  --bg-elevated: #0c111b;
  --surface: rgba(18, 24, 36, 0.78);
  --surface-solid: #121824;
  --surface-2: #172031;
  --surface-glow: rgba(79, 131, 255, 0.07);
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.2);
  --border-hover: rgba(96, 165, 250, 0.42);
  --text: #f7f9fc;
  --muted: #a7b0bf;
  --muted-2: #7f8998;
  --accent: #4f83ff;
  --accent-deep: #3768e0;
  --accent-hover: #82a9ff;
  --accent-soft: rgba(47, 128, 255, 0.12);
  --accent-glow: rgba(47, 128, 255, 0.28);
  --cyan: #58afff;
  --cyan-dim: rgba(88, 175, 255, 0.12);
  --warm: #e8b86d;
  --warm-dim: rgba(232, 184, 109, 0.12);
  --orange: #f0a06a;
  --orange-glow: rgba(240, 160, 106, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-inset-card: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  --shadow-card:
    0 1px 2px rgba(0, 0, 0, 0.2),
    0 8px 24px rgba(0, 0, 0, 0.22),
    var(--shadow-inset-card);
  --shadow-card-hover:
    0 4px 10px rgba(0, 0, 0, 0.22),
    0 14px 36px rgba(0, 0, 0, 0.28),
    var(--shadow-inset-card);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-micro: 180ms var(--ease-out);
  --text-hero: clamp(2.15rem, 5.2vw, 3.35rem);
  --text-h2: clamp(1.35rem, 3.2vw, 1.85rem);
  --text-body: 1.02rem;
  --text-small: 0.88rem;
  --text-label: 0.72rem;
  --content-max: 38rem;
}
html {
  scroll-behavior: smooth;
}

/* ── Scroll progress bar ── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-deep), var(--cyan), var(--accent-hover));
  transform-origin: left center;
  transform: scaleX(0);
  z-index: 200;
  pointer-events: none;
  transition: transform 0.08s linear;
}
@media (min-width: 900px) {
  .scroll-progress {
    left: 216px;
  }
}

body {
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 90% 55% at 88% -8%, rgba(47, 128, 255, 0.14), transparent 58%),
    radial-gradient(ellipse 70% 45% at -8% 100%, rgba(88, 175, 255, 0.07), transparent 52%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
}

body::before {
  background-image:
    linear-gradient(rgba(130, 169, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(130, 169, 255, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(circle at 50% 28%, black, transparent 72%);
  mask-image: radial-gradient(circle at 50% 28%, black, transparent 72%);
  opacity: 0.34;
}

body::after {
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px),
    radial-gradient(circle at 75% 68%, rgba(130, 169, 255, 0.12) 0 1px, transparent 1px);
  background-position: 0 0, 2px 3px;
  background-size: 5px 5px;
  mix-blend-mode: soft-light;
  opacity: 0.16;
}

.site-nav,
header,
main,
footer {
  position: relative;
  z-index: 1;
}

::selection {
  background: var(--accent-soft);
  color: var(--text);
}
/* ── Layout ── */
.site-nav,
header,
main,
footer {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 1.5rem);
}

.site-nav {
  max-width: none;
  margin: 0;
  padding: 0;
}

#main-content:focus {
  outline: none;
}

/* ── Divider ── */
.divider {
  border: none;
  height: 1px;
  margin: 2.5rem 0;
  background: linear-gradient(90deg, transparent, rgba(110, 168, 255, 0.28), transparent);
  opacity: 1;
}

/* ── Focus Visible ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
  box-shadow: 0 0 0 4px var(--accent-soft);
}
/* ── Buttons ── */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  letter-spacing: 0;
  text-transform: none;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  overflow: hidden;
  transition:
    background-color var(--ease-micro),
    color var(--ease-micro),
    box-shadow var(--ease-micro),
    transform var(--ease-micro),
    border-color var(--ease-micro);
  white-space: nowrap;
}

.btn::before {
  position: absolute;
  inset: -45% -75%;
  pointer-events: none;
  content: "";
  background: linear-gradient(
    115deg,
    transparent 35%,
    rgba(255, 255, 255, 0.32) 48%,
    rgba(130, 169, 255, 0.38) 52%,
    transparent 65%
  );
  opacity: 0;
  transform: translateX(-58%) rotate(8deg);
  transition: opacity var(--ease-micro), transform 620ms var(--ease-out);
}

.btn > * {
  position: relative;
  z-index: 1;
}

.btn:hover::before,
.btn:focus-visible::before {
  opacity: 1;
  transform: translateX(58%) rotate(8deg);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-deep) 0%, #5b93f0 100%);
  color: #fff;
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #4f87e8 0%, var(--accent-hover) 100%);
  box-shadow: 0 10px 28px rgba(59, 130, 246, 0.38);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  background-color: var(--accent-soft);
  box-shadow: var(--shadow-card);
  transform: translateY(-1px);
}
@media (max-width: 480px) {
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }
}

/* ── Gradient text utility ── */
.gradient-text {
  background: linear-gradient(115deg, var(--text) 0%, var(--text) 42%, #d7e6ff 68%, var(--accent-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  -moz-background-clip: text;
  background-clip: text;
}
/* ── Scroll Animations ── */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

[data-animate="fade-up"] {
  transform: translateY(24px);
}

[data-animate="fade-left"] {
  transform: translateX(-24px);
}

[data-animate="fade-right"] {
  transform: translateX(24px);
}

[data-animate="scale-in"] {
  transform: scale(0.96);
}

[data-animate].animate-visible {
  opacity: 1;
  transform: none;
}

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

  [data-animate] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .btn-primary,
  .btn-secondary,
  .back-to-top,
  .scroll-progress {
    transition: none !important;
  }

  .btn::before,
  body::after {
    display: none;
  }

  .btn-primary:hover,
  .btn-secondary:hover,
  .back-to-top:hover {
    transform: none;
  }
}
/* ── Back to top ── */
.back-to-top {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--muted);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.3s var(--ease-out), transform 0.3s var(--ease-out), border-color var(--ease-micro), color var(--ease-micro), box-shadow var(--ease-micro);
  z-index: 50;
  box-shadow: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  box-shadow: 0 8px 22px rgba(59, 130, 246, 0.22);
  transform: translateY(-2px);
}
/* ── Desktop: offset content past sidebar ── */
@media (min-width: 900px) {
  main, footer {
    margin-left: 216px;
    margin-right: 0;
    max-width: none;
    padding: 0 clamp(1.5rem, 3vw, 3rem);
  }

  .back-to-top {
    bottom: 1.75rem;
    right: 2rem;
  }
}

/* ── Mobile: room for bottom nav + iOS safe area ── */
@media (max-width: 899px) {
  :root {
    --page-gutter-l: max(1rem, env(safe-area-inset-left, 0px));
    --page-gutter-r: max(1rem, env(safe-area-inset-right, 0px));
  }

  main {
    padding-left: var(--page-gutter-l);
    padding-right: var(--page-gutter-r);
    padding-bottom: 2rem;
    max-width: 100%;
    overflow-x: clip;
  }

  .back-to-top {
    bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
    right: 1rem;
    width: 44px;
    height: 44px;
    font-size: 0.95rem;
  }
}

/* ══════════════════════════════
   Toast notification
   ══════════════════════════════ */
.toast {
  position: fixed;
  bottom: calc(58px + env(safe-area-inset-bottom, 0px) + 1rem);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-md);
  opacity: 0;
  pointer-events: none;
  z-index: 500;
  white-space: nowrap;
  box-shadow: var(--shadow-card-hover);
  transition: opacity 0.2s var(--ease-out), transform 0.2s var(--ease-out);
}
.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Unified visual system ── */
body {
  background:
    radial-gradient(circle at 76% 12%, rgba(79, 131, 255, 0.11), transparent 32rem),
    radial-gradient(circle at 18% 68%, rgba(56, 189, 248, 0.055), transparent 28rem),
    var(--bg);
}

section {
  max-width: 1240px;
  margin-inline: auto;
}

[data-animate],
[data-animate="fade-up"] {
  transform: translateY(16px);
  transition: opacity 550ms var(--ease-out), transform 550ms var(--ease-out);
}

[data-animate="fade-left"] {
  transform: translateX(-16px);
}

[data-animate="fade-right"] {
  transform: translateX(16px);
}

:focus-visible {
  outline: 3px solid rgba(130, 169, 255, 0.8);
  outline-offset: 3px;
  box-shadow: none;
}

.btn {
  min-height: 44px;
  padding: 0.55rem 1.05rem;
  border-radius: var(--radius-sm);
}

.btn-primary {
  border: 1px solid rgba(130, 169, 255, 0.45);
  background: linear-gradient(135deg, #4f83ff, #4268d6);
  box-shadow: 0 10px 30px rgba(79, 131, 255, 0.18);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.035);
}

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

@media (min-width: 900px) {
  .toast {
    bottom: 2rem;
    left: calc(240px + (100vw - 240px) / 2);
  }
}

/* ══════════════════════════════
   Copy button
   ══════════════════════════════ */
.copy-btn {
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.75rem;
  min-height: 44px;
  min-width: 44px;
  font-size: 0.76rem;
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: 0;
  cursor: pointer;
  transition: border-color var(--ease-micro), color var(--ease-micro), background-color var(--ease-micro), box-shadow var(--ease-micro);
  flex-shrink: 0;
  white-space: nowrap;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  background-color: var(--accent-soft);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.crypto-address-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.crypto-address-wrap .crypto-address {
  margin-bottom: 0;
  flex: 1;
  min-width: 0;
}

/* ══════════════════════════════
   Section flash on navigation
   ══════════════════════════════ */
@keyframes section-flash {
  0%   { background-color: transparent; }
  30%  { background-color: var(--accent-soft); }
  100% { background-color: transparent; }
}
.section-flash {
  animation: section-flash 0.9s var(--ease-out);
  border-radius: var(--radius-lg);
}
/* ══════════════════════════════
   Command palette
   ══════════════════════════════ */
body.palette-open {
  overflow: hidden;
}

.cmd-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 300;
}

.cmd-overlay[hidden] { display: none; }

.cmd-palette {
  position: fixed;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(420px, calc(100vw - 2rem));
  background: linear-gradient(165deg, var(--surface-glow) 0%, var(--surface) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card-hover);
  z-index: 400;
  overflow: hidden;
}
.cmd-palette[hidden] { display: none; }

@media (min-width: 900px) {
  .cmd-palette {
    left: calc(240px + (100vw - 240px) / 2);
    top: 36%;
  }
}

.cmd-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.1rem 0.65rem;
  border-bottom: 1px solid var(--border-strong);
}
.cmd-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-family: var(--font-sans);
}

.cmd-keys {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

kbd {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.68rem;
  font-family: inherit;
  font-weight: 600;
  padding: 0.15rem 0.42rem;
  border-radius: 4px;
  line-height: 1.4;
}

.cmd-list {
  padding: 0.4rem;
}

.cmd-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background-color 0.12s, color 0.12s;
  cursor: pointer;
}

.cmd-item:hover,
.cmd-item.cmd-active {
  background: var(--accent-soft);
  color: var(--accent-hover);
}
.cmd-icon {
  width: 1.35rem;
  height: 1.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--muted);
}

.cmd-icon svg {
  width: 1.05rem;
  height: 1.05rem;
  display: block;
}

.cmd-item:hover .cmd-icon,
.cmd-item:focus-visible .cmd-icon {
  color: var(--accent-hover);
}

/* ── Sidebar trigger button (desktop only) ── */
.cmd-trigger {
  display: none;
}

@media (min-width: 900px) {
  .cmd-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-top: 0.6rem;
    padding: 0.42rem 0.85rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--muted);
    font-size: 0.78rem;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
    gap: 0.5rem;
  }

  .cmd-trigger:hover {
    border-color: var(--accent);
    color: var(--accent);
  }

  .cmd-trigger .cmd-keys kbd {
    font-size: 0.62rem;
    padding: 0.1rem 0.32rem;
  }
}