/* ============================================
   PAYMENT PAGE — STYLESHEET
   Stark monochrome, brutalist/technical design:
   pure black + white, razor-thin borders, sharp
   corners, blueprint-style corner metadata.
   ============================================ */

/* ---------- CSS Variables (Design Tokens) ---------- */
:root {
  /* Surfaces */
  --color-bg: #0a0a0a;
  --color-card: #0a0a0a;
  --color-border: #ffffff;
  --color-border-dim: rgba(255, 255, 255, 0.2);
  --color-text: #ffffff;
  --color-subtitle: rgba(255, 255, 255, 0.55);
  --color-meta: rgba(255, 255, 255, 0.5);

  /* Borders */
  --border-hair: 1px solid var(--color-border-dim);
  --border-solid: 1px solid var(--color-border);
  --radius: 2px;

  /* Motion */
  --transition-fast: 120ms ease;
  --transition-med: 220ms ease;

  /* Toast */
  --color-toast-bg: #ffffff;
  --color-toast-text: #0a0a0a;

  /* Typography */
  --font-display: Georgia, "Times New Roman", "Noto Serif", serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", ui-monospace, "Space Mono", Menlo, Consolas, monospace;

  /* Dot-grid canvas */
  --dot-color: rgba(255, 255, 255, 0.18);
}

/* No separate light/dark branch — the design is intentionally
   monochrome in both modes; only the dot opacity nudges slightly. */
@media (prefers-color-scheme: light) {
  :root {
    --dot-color: rgba(255, 255, 255, 0.14);
  }
}

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
  font-family: var(--font-mono);
  color: var(--color-text);
  overflow-x: hidden;
}

/* Full-viewport canvas holding the interactive dot grid, sits behind everything */
#dot-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
}

.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;
}

/* ---------- Full-bleed technical frame ---------- */
.frame {
  position: relative;
  z-index: 1;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}

/* Corner metadata — blueprint-style annotations at the outer margins */
.frame__meta {
  position: absolute;
  font-size: 10px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-meta);
  opacity: 0.5;
  white-space: nowrap;
}

.frame__meta--tl { top: 20px; left: 24px; text-align: left; }
.frame__meta--tr { top: 20px; right: 24px; text-align: right; }
.frame__meta--bl { bottom: 20px; left: 24px; text-align: left; }
.frame__meta--br { bottom: 20px; right: 24px; text-align: right; }

/* Crop / registration marks at the true viewport corners */
.crop {
  position: fixed;
  width: 14px;
  height: 14px;
  pointer-events: none;
  z-index: 1;
}

.crop::before,
.crop::after {
  content: "";
  position: absolute;
  background-color: var(--color-border-dim);
}

.crop::before { width: 100%; height: 1px; top: 50%; transform: translateY(-50%); }
.crop::after  { height: 100%; width: 1px; left: 50%; transform: translateX(-50%); }

.crop--tl { top: 16px; left: 16px; }
.crop--tr { top: 16px; right: 16px; }
.crop--bl { bottom: 16px; left: 16px; }
.crop--br { bottom: 16px; right: 16px; }

/* ---------- Card ---------- */
.card {
  position: relative;
  width: 100%;
  max-width: 380px;
  background-color: var(--color-card);
  border: var(--border-hair);
  border-radius: var(--radius);
  padding: 40px 28px;
  text-align: center;
}

.card__icon {
  color: var(--color-text);
  margin-bottom: 12px;
  display: inline-block;
}

.card__heading {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.2px;
  margin: 0 0 6px;
  text-transform: uppercase;
}

.card__subtitle {
  margin: 0 0 20px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-subtitle);
}

/* Technical metadata strip inside the card — kept small, dim, framing */
.spec-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 12px;
  margin: 0 0 24px;
  padding: 8px 0;
  border-top: var(--border-hair);
  border-bottom: var(--border-hair);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-meta);
  opacity: 0.5;
}

.card__footer {
  margin-top: 22px;
  font-size: 12px;
  color: var(--color-subtitle);
}

/* ---------- QR Code Box ---------- */
.qr-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin: 0 0 24px;
}

.qr-box__image {
  display: block;
  width: 160px;
  height: 160px;
  object-fit: contain;
  background-color: #ffffff;
  padding: 8px;
  border: var(--border-hair);
  border-radius: var(--radius);
}

.qr-box__label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-subtitle);
}

/* ---------- UPI Input Box ---------- */
.upi-box {
  text-align: left;
  margin-bottom: 22px;
}

.upi-box__label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
  color: var(--color-subtitle);
}

.upi-box__field {
  display: flex;
  align-items: stretch;
  border: var(--border-hair);
  border-radius: var(--radius);
  background-color: transparent;
  overflow: hidden;
}

.upi-box__input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  cursor: default;
}

.upi-box__input:focus {
  outline: none;
}

.upi-box__copy {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  border: none;
  border-left: var(--border-hair);
  background-color: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.upi-box__copy:hover {
  background-color: var(--color-text);
  color: var(--color-bg);
}

.upi-box__copy:active {
  transform: scale(0.92);
}

.upi-box__copy:focus-visible,
.btn:focus-visible {
  outline: 1px dashed var(--color-text);
  outline-offset: 2px;
}

/* ---------- Payment Buttons ---------- */
.pay-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-text);
  background-color: transparent;
  padding: 14px 16px;
  border: var(--border-hair);
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.btn__icon {
  flex-shrink: 0;
}

/* Brutalist hover: invert to solid white / black text */
.btn:hover {
  background-color: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.btn:active {
  transform: translate(0.5px, 0.5px);
}

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%, 20px);
  background-color: var(--color-toast-bg);
  color: var(--color-toast-text);
  border: var(--border-solid);
  border-radius: var(--radius);
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-med), transform var(--transition-med);
  z-index: 10;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- Security note ---------- */
.security-note {
  margin: 16px 0 0;
  font-size: 8.5px;
  line-height: 1.5;
  color: var(--color-subtitle);
  opacity: 0.7;
}

/* ---------- Made-by-humans pill badge ---------- */
.pill {
  display: inline-block;
  margin-top: 20px;
  padding: 5px 14px;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  background-color: transparent;
  color: var(--color-text);
  border: var(--border-solid);
  border-radius: 999px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .frame {
    padding: 32px 16px;
  }

  .card {
    padding: 28px 20px;
  }

  .card__heading {
    font-size: 21px;
  }

  .btn {
    font-size: 12px;
    padding: 13px 14px;
  }

  .frame__meta {
    font-size: 8px;
  }

  .spec-strip {
    font-size: 8px;
    gap: 3px 8px;
  }

  .qr-box__image {
    width: 128px;
    height: 128px;
  }
}