@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Orbitron:wght@400;700;900&display=swap');

:root {
  --bg: #040812;
  --card-bg: rgba(13, 27, 46, 0.85);
  --card-border: rgba(0, 212, 255, 0.2);
  --accent: #00d4ff;
  --accent2: #7c3aed;
  --accent3: #10b981;
  --text: #e2e8f0;
  --muted: #64748b;
  --glow: rgba(0, 212, 255, 0.15);
}

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

body {
  margin: 0;
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(circle at 50% 0%, #0c182c 0%, var(--bg) 100%);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

nav {
  background: rgba(7, 13, 24, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav a {
  color: var(--text);
  text-decoration: none;
  margin-left: 24px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--accent);
}

nav b {
  font-family: 'Orbitron', sans-serif;
  font-size: 18px;
  letter-spacing: 2px;
  color: #fff;
}

.container {
  max-width: 1000px;
  margin: 40px auto;
  padding: 0 20px 60px;
}

h2 {
  font-family: 'Orbitron', sans-serif;
  margin-bottom: 30px;
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 1px;
  color: #fff;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

h2::before {
  content: '⚡';
  color: var(--accent);
  font-size: 24px;
}

.steps {
  display: flex;
  margin-bottom: 36px;
  gap: 12px;
}

.step {
  flex: 1;
  text-align: center;
  padding: 14px 12px;
  font-family: 'Orbitron', sans-serif;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(13, 27, 46, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  transition: all 0.3s ease;
}

.step.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(124, 58, 237, 0.15));
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
  font-weight: 700;
}

.step.done {
  color: var(--accent3);
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.05);
}

.checkout-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 30px;
}

@media(max-width: 820px) {
  .checkout-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 26px;
  margin-bottom: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card h3 {
  margin: 0 0 22px;
  font-family: 'Orbitron', sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.field {
  margin-bottom: 18px;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #94a3b8;
  margin-bottom: 6px;
}

label span.req {
  color: #f43f5e;
}

input[type=text], input[type=email], input[type=tel], input[type=password], select {
  width: 100%;
  padding: 12px 16px;
  background: rgba(4, 10, 20, 0.7);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 8px;
  color: #fff;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  outline: none;
  transition: all 0.25s ease;
  appearance: none;
  -webkit-appearance: none;
}

input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
  background: rgba(4, 10, 20, 0.95);
}

input::placeholder {
  color: #475569;
}

input[readonly] {
  opacity: 0.6;
  cursor: not-allowed;
}

select option {
  background: #0d1b2e;
  color: #fff;
}

.row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.row3 {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 14px;
}

@media(max-width: 540px) {
  .row2, .row3 {
    grid-template-columns: 1fr;
  }
}

input.err, select.err {
  border-color: #f43f5e;
  box-shadow: 0 0 10px rgba(244, 63, 94, 0.3);
}

.err-msg {
  font-size: 11px;
  color: #f43f5e;
  margin-top: 5px;
  display: none;
  font-weight: 500;
}

.err-msg.show {
  display: block;
}

.pay-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
}

.pay-tab {
  flex: 1;
  padding: 12px 8px;
  text-align: center;
  border-radius: 8px;
  border: 1px solid rgba(0, 212, 255, 0.2);
  background: rgba(4, 10, 20, 0.6);
  color: #94a3b8;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: all 0.25s ease;
}

.pay-tab.active {
  border-color: var(--accent);
  color: #fff;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(124, 58, 237, 0.2));
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
}

.pay-tab:hover {
  border-color: var(--accent);
  color: #fff;
}

.pay-panel {
  display: none;
}

.pay-panel.active {
  display: block;
}

.card-visual {
  background: linear-gradient(135deg, #092244 0%, #173868 100%);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 14px;
  padding: 22px 24px;
  margin-bottom: 22px;
  position: relative;
  overflow: hidden;
  min-height: 140px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.card-visual::before {
  content: '';
  position: absolute;
  right: -30px;
  top: -30px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.08);
}

.card-visual::after {
  content: '';
  position: absolute;
  right: 20px;
  top: 10px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: rgba(124, 58, 237, 0.08);
}

.card-chip {
  width: 40px;
  height: 30px;
  background: linear-gradient(135deg, #d4af37, #f7d070);
  border-radius: 5px;
  margin-bottom: 16px;
}

.card-number-display {
  font-size: 18px;
  letter-spacing: 3px;
  font-family: monospace;
  color: #fff;
  margin-bottom: 16px;
  word-spacing: 8px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.card-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #cbd5e1;
}

.card-bottom .card-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #64748b;
  margin-bottom: 2px;
}

.upi-logos {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.upi-logo {
  background: rgba(4, 10, 20, 0.7);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 700;
  color: #94a3b8;
  cursor: pointer;
  transition: all 0.2s ease;
}

.upi-logo:hover, .upi-logo.selected {
  border-color: var(--accent);
  color: #fff;
  background: rgba(0, 212, 255, 0.1);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.2);
}

.bank-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}

.bank-opt {
  background: rgba(4, 10, 20, 0.7);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 8px;
  padding: 12px 8px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: #94a3b8;
  cursor: pointer;
  transition: all 0.2s ease;
}

.bank-opt:hover, .bank-opt.selected {
  border-color: var(--accent);
  color: #fff;
  background: rgba(0, 212, 255, 0.1);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.2);
}

.summary-item {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 15px;
}

.summary-item:last-child {
  border-bottom: none;
}

.summary-item .name {
  color: #cbd5e1;
}

.qty-mini {
  display: flex;
  align-items: center;
  gap: 8px;
}

.qty-mini button {
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qty-mini button:hover {
  background: var(--accent);
  color: #000;
}

.qty-mini span {
  min-width: 24px;
  text-align: center;
  font-weight: bold;
  font-family: 'Orbitron', sans-serif;
  color: #fff;
}

.summary-total {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 2px solid var(--accent);
  font-family: 'Orbitron', sans-serif;
  font-size: 20px;
  font-weight: 900;
}

.summary-total .amount {
  color: var(--accent3);
  text-shadow: 0 0 15px rgba(16, 185, 129, 0.4);
}

.review-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 14px;
}

.review-row:last-child {
  border-bottom: none;
}

.review-row .rlabel {
  color: #64748b;
  min-width: 130px;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.review-row .rval {
  color: #fff;
  text-align: right;
  font-weight: 600;
}

.btn-primary {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--accent), #0070f3);
  border: none;
  border-radius: 10px;
  font-family: 'Orbitron', sans-serif;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #000;
  cursor: pointer;
  margin-top: 12px;
  transition: all 0.3s ease;
  box-shadow: 0 0 25px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
}

.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-back {
  width: 100%;
  padding: 13px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  margin-top: 10px;
  transition: all 0.25s ease;
}

.btn-back:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.secure-note {
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.gateway-note {
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 13px;
  color: #94a3b8;
  line-height: 1.6;
  margin-bottom: 18px;
}

.gateway-note b {
  color: var(--accent);
}

#serverError {
  display: none;
  background: rgba(244, 63, 94, 0.1);
  border: 1px solid #f43f5e;
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 18px;
  font-size: 13px;
  color: #fda4af;
  line-height: 1.6;
}

#serverError b {
  color: #f43f5e;
}

.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}

.empty a {
  color: var(--accent);
}

.section {
  display: none;
}

.section.active {
  display: block;
}

.success-box {
  text-align: center;
  padding: 60px 30px;
  background: var(--card-bg);
  border: 1px solid var(--accent3);
  border-radius: 16px;
  box-shadow: 0 0 40px rgba(16, 185, 129, 0.25);
}

.success-box .tick {
  font-size: 56px;
  margin-bottom: 16px;
  color: var(--accent3);
}

.success-box h3 {
  font-family: 'Orbitron', sans-serif;
  font-size: 24px;
  color: var(--accent3);
  margin: 0 0 10px;
}

.success-box p {
  color: #94a3b8;
  font-size: 15px;
}