/* =========================================================
   Coinbase Design System — Tokens
   =========================================================
   Drop this file at the top of any Coinbase-styled HTML and
   reference variables via var(--token).

   Substitutions in play (see README):
     CoinbaseDisplay → Inter 400 (letter-spacing -0.04em)
     CoinbaseSans    → Inter 400/500/600/700
     CoinbaseMono    → JetBrains Mono 500
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* ---------- COLOR ---------- */

  /* Brand & accent */
  --color-primary:           #0052ff;
  --color-primary-active:    #003ecc;
  --color-primary-disabled:  #a8b8cc;
  --color-accent-yellow:     #f4b000;

  /* Ink / text */
  --color-ink:           #0a0b0d;
  --color-body:          #5b616e;
  --color-body-strong:   #0a0b0d;
  --color-muted:         #7c828a;
  --color-muted-soft:    #a8acb3;

  /* Hairlines */
  --color-hairline:       #dee1e6;
  --color-hairline-soft:  #eef0f3;

  /* Surfaces */
  --color-canvas:               #ffffff;
  --color-surface-soft:         #f7f7f7;
  --color-surface-strong:       #eef0f3;
  --color-surface-card:         #ffffff;
  --color-surface-dark:         #0a0b0d;
  --color-surface-dark-elevated:#16181c;

  /* On-color text */
  --color-on-primary:    #ffffff;
  --color-on-dark:       #ffffff;
  --color-on-dark-soft:  #a8acb3;

  /* Trading semantics */
  --color-semantic-up:    #05b169;
  --color-semantic-down:  #cf202f;

  /* ---------- TYPE ---------- */

  --font-display: 'Inter', -apple-system, system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-body:    'Inter', -apple-system, system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', 'Menlo', monospace;

  /* Display scale — CoinbaseDisplay weight 400, negative tracking */
  --text-display-mega-size:    80px;
  --text-display-mega-lh:      1.0;
  --text-display-mega-track:   -2px;

  --text-display-xl-size:      64px;
  --text-display-xl-lh:        1.0;
  --text-display-xl-track:     -1.6px;

  --text-display-lg-size:      52px;
  --text-display-lg-lh:        1.0;
  --text-display-lg-track:     -1.3px;

  --text-display-md-size:      44px;
  --text-display-md-lh:        1.09;
  --text-display-md-track:     -1px;

  --text-display-sm-size:      36px;
  --text-display-sm-lh:        1.11;
  --text-display-sm-track:     -0.5px;

  /* Title scale — CoinbaseSans */
  --text-title-lg-size:        32px;
  --text-title-lg-lh:          1.13;
  --text-title-lg-track:       -0.4px;

  --text-title-md-size:        18px;
  --text-title-md-lh:          1.33;

  --text-title-sm-size:        16px;
  --text-title-sm-lh:          1.25;

  /* Body scale */
  --text-body-md-size:         16px;
  --text-body-md-lh:           1.5;

  --text-body-sm-size:         14px;
  --text-body-sm-lh:           1.5;

  --text-caption-size:         13px;
  --text-caption-lh:           1.5;

  --text-caption-strong-size:  12px;
  --text-caption-strong-lh:    1.5;

  /* Mono / numerical */
  --text-number-size:          18px;
  --text-number-lh:            1.4;

  /* Button / nav */
  --text-button-size:          16px;
  --text-button-lh:            1.15;

  --text-nav-size:             14px;
  --text-nav-lh:               1.4;

  /* ---------- SHAPE ---------- */
  --radius-none:  0px;
  --radius-xs:    4px;
  --radius-sm:    8px;
  --radius-md:    12px;
  --radius-lg:    16px;
  --radius-xl:    24px;
  --radius-pill:  100px;
  --radius-full:  9999px;

  /* ---------- SPACE ---------- */
  --space-xxs:     4px;
  --space-xs:      8px;
  --space-sm:      12px;
  --space-base:    16px;
  --space-md:      20px;
  --space-lg:      24px;
  --space-xl:      32px;
  --space-xxl:     48px;
  --space-section: 96px;

  /* ---------- ELEVATION ---------- */
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.04);

  /* ---------- BREAKPOINTS (for reference) ---------- */
  --bp-mobile:  640px;
  --bp-tablet:  1024px;
  --bp-desk:    1280px;

  /* ---------- LAYOUT ---------- */
  --container-max: 1200px;
  --nav-height: 64px;
}

/* =========================================================
   Base + semantic resets
   ========================================================= */

html, body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-body-md-size);
  line-height: var(--text-body-md-lh);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Semantic type classes — apply via class or extend in component CSS */

.t-display-mega {
  font-family: var(--font-display);
  font-size: var(--text-display-mega-size);
  font-weight: 400;
  line-height: var(--text-display-mega-lh);
  letter-spacing: var(--text-display-mega-track);
  color: var(--color-ink);
}
.t-display-xl {
  font-family: var(--font-display);
  font-size: var(--text-display-xl-size);
  font-weight: 400;
  line-height: var(--text-display-xl-lh);
  letter-spacing: var(--text-display-xl-track);
  color: var(--color-ink);
}
.t-display-lg {
  font-family: var(--font-display);
  font-size: var(--text-display-lg-size);
  font-weight: 400;
  line-height: var(--text-display-lg-lh);
  letter-spacing: var(--text-display-lg-track);
  color: var(--color-ink);
}
.t-display-md {
  font-family: var(--font-display);
  font-size: var(--text-display-md-size);
  font-weight: 400;
  line-height: var(--text-display-md-lh);
  letter-spacing: var(--text-display-md-track);
  color: var(--color-ink);
}
.t-display-sm {
  font-family: var(--font-body);
  font-size: var(--text-display-sm-size);
  font-weight: 400;
  line-height: var(--text-display-sm-lh);
  letter-spacing: var(--text-display-sm-track);
  color: var(--color-ink);
}
.t-title-lg {
  font-family: var(--font-body);
  font-size: var(--text-title-lg-size);
  font-weight: 400;
  line-height: var(--text-title-lg-lh);
  letter-spacing: var(--text-title-lg-track);
  color: var(--color-ink);
}
.t-title-md {
  font-family: var(--font-body);
  font-size: var(--text-title-md-size);
  font-weight: 600;
  line-height: var(--text-title-md-lh);
  color: var(--color-ink);
}
.t-title-sm {
  font-family: var(--font-body);
  font-size: var(--text-title-sm-size);
  font-weight: 600;
  line-height: var(--text-title-sm-lh);
  color: var(--color-ink);
}
.t-body-md {
  font-family: var(--font-body);
  font-size: var(--text-body-md-size);
  font-weight: 400;
  line-height: var(--text-body-md-lh);
  color: var(--color-body);
}
.t-body-strong {
  font-family: var(--font-body);
  font-size: var(--text-body-md-size);
  font-weight: 700;
  line-height: var(--text-body-md-lh);
  color: var(--color-ink);
}
.t-body-sm {
  font-family: var(--font-body);
  font-size: var(--text-body-sm-size);
  font-weight: 400;
  line-height: var(--text-body-sm-lh);
  color: var(--color-body);
}
.t-caption {
  font-family: var(--font-body);
  font-size: var(--text-caption-size);
  font-weight: 400;
  line-height: var(--text-caption-lh);
  color: var(--color-muted);
}
.t-caption-strong {
  font-family: var(--font-body);
  font-size: var(--text-caption-strong-size);
  font-weight: 600;
  line-height: var(--text-caption-strong-lh);
  color: var(--color-ink);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.t-number {
  font-family: var(--font-mono);
  font-size: var(--text-number-size);
  font-weight: 500;
  line-height: var(--text-number-lh);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.t-nav {
  font-family: var(--font-body);
  font-size: var(--text-nav-size);
  font-weight: 500;
  line-height: var(--text-nav-lh);
  color: var(--color-ink);
}

/* =========================================================
   Component primitives — minimal, just enough for prototyping
   ========================================================= */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--text-button-size);
  font-weight: 600;
  line-height: var(--text-button-lh);
  border-radius: var(--radius-pill);
  border: 0;
  padding: 12px 20px;
  height: 44px;
  cursor: pointer;
  transition: background-color 150ms ease-out, color 150ms ease-out;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.btn--primary:hover { background: #0046dd; }
.btn--primary:active { background: var(--color-primary-active); }
.btn--primary:disabled { background: var(--color-primary-disabled); cursor: not-allowed; }

.btn--secondary {
  background: var(--color-surface-strong);
  color: var(--color-ink);
}
.btn--secondary:hover { background: #e4e7ec; }

.btn--secondary-dark {
  background: var(--color-surface-dark-elevated);
  color: var(--color-on-dark);
}
.btn--outline-dark {
  background: transparent;
  color: var(--color-on-dark);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 11px 19px;
}
.btn--tertiary {
  background: transparent;
  color: var(--color-primary);
  padding: 0;
  height: auto;
}
.btn--cta {
  height: 56px;
  padding: 16px 32px;
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.btn--cta:hover { background: #0046dd; }

/* Inputs */
.input {
  display: block;
  width: 100%;
  height: 48px;
  padding: 14px 16px;
  font-family: var(--font-body);
  font-size: var(--text-body-md-size);
  line-height: var(--text-body-md-lh);
  color: var(--color-ink);
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  box-sizing: border-box;
  outline: none;
  transition: border-color 150ms ease-out;
}
.input:focus { border-color: var(--color-primary); border-width: 2px; padding: 13px 15px; }

.input--search-pill {
  height: 44px;
  padding: 12px 20px;
  background: var(--color-surface-strong);
  border: 0;
  border-radius: var(--radius-pill);
}

/* Pills / badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: var(--color-surface-strong);
  color: var(--color-ink);
  border-radius: var(--radius-pill);
  font-size: var(--text-caption-strong-size);
  font-weight: 600;
  line-height: var(--text-caption-strong-lh);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Cards */
.card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}
.card--dark {
  background: var(--color-surface-dark-elevated);
  border: 0;
  color: var(--color-on-dark);
}
.card:hover { box-shadow: var(--shadow-card-hover); }

/* Asset icon plate */
.asset-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-surface-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

/* Section bands */
.band {
  padding: var(--space-section) var(--space-xxl);
  background: var(--color-canvas);
}
.band--soft { background: var(--color-surface-soft); }
.band--dark { background: var(--color-surface-dark); color: var(--color-on-dark); }
.band__inner { max-width: var(--container-max); margin: 0 auto; }

/* Hairline divider */
.hairline { border: 0; border-top: 1px solid var(--color-hairline); margin: 0; }

/* Price semantics */
.price-up { color: var(--color-semantic-up); }
.price-down { color: var(--color-semantic-down); }