/* ═══════════════════════════════════════════════════════════════════════════
   BloxTip — Design System
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Reset & Tokens ──────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Palette — clean, human-made dark mode */
  --bg: #0f1115;
  --bg-card: #181a20;
  --bg-card-border: #2c2f36;
  --bg-card-hover: #21242c;
  --surface: #22252b;
  --surface-border: #33363d;

  --accent: #22c55e; /* Flat green */
  --accent-dim: #1ea34d;
  --accent-subtle: rgba(34, 197, 94, 0.1);

  --text: #f8fafc;
  --text-dim: #94a3b8;
  --text-muted: #64748b;

  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 16px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --transition: 150ms ease;
  --transition-slow: 300ms ease;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ── Simple Background ─────────────────────────────────────────────────── */
.bg-base {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 0;
}

/* ── GitHub Corner ───────────────────────────────────────────────────────── */
.github-corner {
  position: absolute;
  top: 24px;
  right: 24px;
  color: var(--text-muted);
  transition: var(--transition);
  z-index: 10;
}

.github-corner:hover {
  color: var(--text);
  transform: scale(1.1);
}

/* ── Layout ──────────────────────────────────────────────────────────────── */
#app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 40px 20px;
  gap: 20px;
}

/* ── Hero Badge ──────────────────────────────────────────────────────────── */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--accent-subtle);
  border: 1px solid var(--surface-border);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-dim);
}

@keyframes badgeFadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Card ────────────────────────────────────────────────────────────────── */
.card {
  width: 100%;
  max-width: 460px;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  animation: cardFadeIn 0.6s ease-out 0.1s both;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Card header */
.card__header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.card__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  margin-bottom: 4px;
  color: var(--accent);
}

.card__icon svg {
  width: 38px;
  height: 38px;
}

.card__title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.card__subtitle {
  font-size: 0.875rem;
  color: var(--text-dim);
  font-weight: 400;
}

/* ── Input Group ─────────────────────────────────────────────────────────── */
.input-group__label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}


.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix {
  position: absolute;
  left: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent);
  pointer-events: none;
  z-index: 2;
}

.input-field {
  width: 100%;
  padding: 14px 18px 14px 50px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.15rem;
  font-weight: 600;
  outline: none;
  transition: var(--transition);
  position: relative;
  z-index: 1;
}

.input-field::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.input-field:focus {
  border-color: var(--accent);
  background: var(--surface);
}

.input-hint {
  margin-top: 6px;
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ── Quick Amount Buttons ────────────────────────────────────────────────── */
.quick-amounts {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.quick-btn {
  flex: 1;
  min-width: 60px;
  padding: 8px 4px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.quick-btn:hover {
  background: var(--surface-border);
  color: var(--text);
}

.quick-btn:active {
  transform: scale(0.97);
}

.quick-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* ── Toggle Row ──────────────────────────────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
}

.toggle-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.toggle-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.toggle-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.toggle {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.toggle__track {
  display: flex;
  align-items: center;
  width: 40px;
  height: 22px;
  background: var(--surface-border);
  border-radius: 100px;
  padding: 2px;
  transition: var(--transition);
}

.toggle[aria-checked="true"] .toggle__track {
  background: var(--accent);
}

.toggle__thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: var(--transition);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.toggle[aria-checked="true"] .toggle__thumb {
  transform: translateX(18px);
}

/* ── Preview ─────────────────────────────────────────────────────────────── */
.preview {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview__row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.preview__label {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
}

.preview__value {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.preview__value--accent {
  color: var(--accent);
}

.preview__divider {
  height: 1px;
  background: var(--surface-border);
}

/* ── Send Button ─────────────────────────────────────────────────────────── */
.btn-send {
  position: relative;
  width: 100%;
  padding: 14px 20px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
}

.btn-send:disabled {
  background: var(--surface);
  color: var(--text-muted);
  cursor: not-allowed;
  border: 1px solid var(--surface-border);
}

.btn-send:not(:disabled):hover {
  background: var(--accent-dim);
}

.btn-send:not(:disabled):active {
  transform: scale(0.98);
}

.btn-send__text {
  transition: opacity var(--transition);
}

.btn-send--loading .btn-send__text {
  opacity: 0;
}

/* Spinner */
.btn-send__spinner {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-send__spinner[hidden] {
  display: none !important;
}

.spinner {
  width: 22px;
  height: 22px;
  border: 3px solid rgba(5, 10, 14, 0.2);
  border-top-color: #050a0e;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ── Result Panel ────────────────────────────────────────────────────────── */
.result {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  animation: resultIn 0.5s ease-out;
}

.result[hidden] {
  display: none !important;
}

@keyframes resultIn {
  from { opacity: 0; transform: translateY(12px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.result__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: 50%;
  color: var(--accent);
  margin-bottom: 4px;
}

.result__icon svg {
  width: 24px;
  height: 24px;
}

.result__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
}

.result__desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
  max-width: 320px;
}

.result__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.result__link:hover {
  background: var(--surface-border);
}

.result__details {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.result__details strong {
  color: var(--text-dim);
  font-weight: 600;
}

.result__sep {
  color: var(--text-muted);
  opacity: 0.4;
}

.result__reset {
  appearance: none;
  background: none;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-dim);
  cursor: pointer;
  transition: var(--transition);
  margin-top: 4px;
}

.result__reset:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* Result step children — center their content */
#resultStep1, #resultStep2, #resultStep3 {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  animation: resultIn 0.5s ease-out;
}

#resultStep2[hidden], #resultStep3[hidden] {
  display: none !important;
}

.result__icon--question {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.15), rgba(251, 191, 36, 0.05));
  border-color: rgba(251, 191, 36, 0.25);
  color: #fbbf24;
}

.result__title--question {
  color: #fbbf24;
}

.result__icon--done {
  background: linear-gradient(135deg, rgba(56, 239, 125, 0.2), rgba(56, 239, 125, 0.08));
  border-color: rgba(56, 239, 125, 0.35);
  color: var(--accent);
}

.result__actions {
  display: flex;
  gap: 10px;
  width: 100%;
  flex-wrap: wrap;
}

.result__action {
  flex: 1;
  min-width: 140px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.result__action--yes {
  background: linear-gradient(135deg, var(--accent-dim), var(--accent));
  color: #050a0e;
}

.result__action--yes:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.result__action--retry {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-dim);
}

.result__action--retry:hover {
  border-color: rgba(251, 191, 36, 0.3);
  color: #fbbf24;
}

/* ── Error Toast ─────────────────────────────────────────────────────────── */
.error-toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  color: #fca5a5;
  font-size: 0.82rem;
  font-weight: 500;
  animation: toastIn 0.3s ease-out;
}

.error-toast[hidden] {
  display: none !important;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.error-toast svg {
  flex-shrink: 0;
  color: var(--danger);
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.footer {
  text-align: center;
  animation: cardFadeIn 0.6s ease-out 0.3s both;
}

.footer p {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.footer a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 155, 168, 0.3);
  transition: var(--transition);
}

.footer a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-dim);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 520px) {
  .card {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
  }

  .card__title {
    font-size: 1.4rem;
  }

  .quick-amounts {
    gap: 6px;
  }

  .quick-btn {
    min-width: 50px;
    padding: 7px 2px;
    font-size: 0.7rem;
  }

  .result__details {
    flex-direction: column;
    gap: 4px;
  }

  .result__sep {
    display: none;
  }
}