* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg: #0f172a;
  --card: #1e293b;
  --card-hover: #253349;
  --border: #334155;
  --accent: #f43f5e;
  --accent-glow: rgba(244, 63, 94, 0.15);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --success-bg: #052e16;
  --success: #4ade80;
  --error-bg: #450a0a;
  --error: #fb7185;
  --radius: 14px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
}

.screen {
  width: 100%;
  max-width: 420px;
  padding: 0 1.25rem;
}

.hidden { display: none !important; }

/* === PIN Screen === */
#pin-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: env(safe-area-inset-top, 0) 1.25rem env(safe-area-inset-bottom, 0);
}

.pin-content {
  text-align: center;
  width: 100%;
}

.pin-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

#pin-screen h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.2rem;
}

#pin-screen p {
  color: var(--text-dim);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

#pin-dots {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--card);
  border: 1.5px solid var(--border);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.dot.filled {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
  transform: scale(1.2);
}

#pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  max-width: 264px;
  margin: 0 auto;
}

.pin-key {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.35rem;
  font-weight: 500;
  border-radius: 50%;
  width: 72px;
  height: 72px;
  cursor: pointer;
  transition: all 0.12s ease;
  justify-self: center;
  -webkit-user-select: none;
  user-select: none;
}

.pin-key:active {
  background: var(--card-hover);
  transform: scale(0.93);
}

.pin-key[data-key=""] {
  visibility: hidden;
}

.pin-delete {
  font-size: 1.3rem;
  color: var(--text-muted);
}

/* === Form Screen === */
#form-screen {
  padding-top: calc(env(safe-area-inset-top, 20px) + 1rem);
  padding-bottom: calc(env(safe-area-inset-bottom, 20px) + 2rem);
}

.section {
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
}

/* === Form === */
.form-row {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.form-half {
  flex: 1;
  min-width: 0;
}

.form-group {
  margin: 0;
}

label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

input {
  display: block;
  width: 100%;
  padding: 0.7rem 0.8rem;
  font-size: 1rem;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
  appearance: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder {
  color: var(--text-dim);
  opacity: 0.6;
}

input[type="date"] {
  color-scheme: dark;
  min-height: 2.65rem;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
}

/* Calculated price */
#calc-price {
  margin-top: 0.4rem;
  margin-bottom: -0.2rem;
  padding: 0.55rem 0.8rem;
  background: var(--bg);
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.calc-label {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.calc-value {
  font-weight: 700;
  color: var(--accent);
  font-size: 1rem;
}

#submit-btn {
  display: block;
  width: 100%;
  padding: 0.85rem;
  font-size: 1rem;
  font-weight: 600;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  margin-top: 1rem;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  letter-spacing: -0.01em;
}

#submit-btn:active {
  opacity: 0.85;
  transform: scale(0.98);
}

#submit-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* Message */
#message {
  margin-top: 0.6rem;
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  font-size: 0.85rem;
  text-align: center;
  font-weight: 500;
}

#message.success { background: var(--success-bg); color: var(--success); }
#message.error { background: var(--error-bg); color: var(--error); }

/* === Stats === */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.5rem;
  text-align: center;
}

.stat-primary {
  border-color: rgba(244, 63, 94, 0.25);
  background: linear-gradient(135deg, var(--card), rgba(244, 63, 94, 0.05));
}

.stat-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stat-primary .stat-value {
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 0.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* === History === */
#history {
  text-align: left;
}

.history-row {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.15s;
}

.history-left {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.history-date {
  font-weight: 600;
  font-size: 0.88rem;
}

.history-details {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.08rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-price {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.88rem;
  white-space: nowrap;
  margin-left: 0.75rem;
}

/* === Animations === */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.section {
  animation: fadeIn 0.35s ease-out;
}