:root {
  --color-bg-start: #0f172a;
  --color-bg-end: #1e1b4b;
  --color-primary: #818cf8;
  --color-primary-hover: #6366f1;
  --color-glass: rgba(30, 41, 59, 0.7);
  --color-glass-border: rgba(255, 255, 255, 0.1);
  --color-text-main: #f8fafc;
  --color-text-dim: #94a3b8;
  --color-input-bg: rgba(15, 23, 42, 0.6);
  --color-error: #ef4444;

  --spacing-1: clamp(4px, 1vh, 8px);
  --spacing-2: clamp(8px, 2vh, 16px);
  --spacing-3: clamp(12px, 3vh, 24px);
  --spacing-4: clamp(16px, 4vh, 32px);
  --spacing-5: clamp(20px, 5vh, 40px);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", sans-serif;
  background: linear-gradient(
    135deg,
    var(--color-bg-start),
    var(--color-bg-end)
  );
  color: var(--color-text-main);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center; /* Center vertically on single page */
  padding: 2vh var(--spacing-2);
  overflow-x: hidden;
  position: relative;
}

.app-background {
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.15) 0%,
    transparent 50%
  );
  z-index: 0;
  pointer-events: none;
}

.container {
  max-width: 1000px;
  width: 100%;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.header {
  text-align: center;
}

.header h1 {
  font-size: clamp(1.8rem, 4vw, 2.2rem);
  font-weight: 700;
  margin-bottom: var(--spacing-1);
  background: linear-gradient(to right, #a5b4fc, #818cf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header p {
  color: var(--color-text-dim);
  font-size: clamp(0.9rem, 2vw, 1rem);
}

.flex-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3);
}

@media (min-width: 860px) {
  .flex-grid {
    grid-template-columns: 1fr 1fr;
    align-items: stretch; /* Cards will be equal height */
    gap: var(--spacing-4);
  }
}

.glass-panel {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: 16px;
  padding: clamp(20px, 4vh, var(--spacing-4));
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: center; /* Ensure contents stay centered vertically when stretched */
}

.form-group {
  margin-bottom: var(--spacing-3);
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--spacing-1);
  color: var(--color-text-dim);
}

.optional {
  font-size: 0.75rem;
  opacity: 0.7;
}

.form-group input {
  background: var(--color-input-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: 8px;
  padding: clamp(10px, 1.5vh, 12px) 16px;
  color: var(--color-text-main);
  font-size: 0.95rem;
  outline: none;
  transition: all 150ms ease;
  font-family: inherit;
}

.form-group input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.form-group input.input-error {
  border-color: var(--color-error);
}

.form-group input.input-error:focus {
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.2);
}

.error-message {
  color: var(--color-error);
  font-size: 0.8rem;
  margin-top: 4px;
  min-height: 16px;
  display: block;
}

.btn {
  width: 100%;
  padding: clamp(12px, 2vh, 14px) 20px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 150ms ease;
  border: none;
  display: flex;
  justify-content: center;
  align-items: center;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  margin-top: var(--spacing-2);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  margin-top: var(--spacing-3);
  border: 1px solid var(--color-glass-border);
}

.btn-secondary:not(:disabled):hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.form-hint {
  margin-top: var(--spacing-2);
  font-size: 0.8rem;
  color: var(--color-text-dim);
  text-align: center;
}

/* Card Styles */
.card-wrapper {
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  border-radius: 16px;
}

.qr-card {
  background: #ffffff;
  color: #334155;
  padding: clamp(20px, 4vh, 32px) clamp(16px, 3vw, 24px);
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 320px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative; /* Added for absolute positioning of children */
}

/* Floating Download Icon Button */
.btn-download-icon {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255, 255, 255, 0.1); /* Match the glass UI */
  border: 1px solid var(--color-glass-border);
  color: #fff; /* White icon on dark glass panel */
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: all 150ms ease;
  z-index: 10;
}

.btn-download-icon:hover {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

.btn-download-icon:active {
  transform: translateY(0) scale(0.95);
}

.btn-download-icon svg {
  width: 18px;
  height: 18px;
}

.card-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: var(--spacing-3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  word-break: break-word;
}

.qrcode-container {
  background: #fff;
  padding: 8px;
  border-radius: 8px;
  margin-bottom: var(--spacing-3);
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 180px;
  aspect-ratio: 1;
}

.qrcode-container img,
.qrcode-container canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

.card-upi {
  font-size: 1.05rem;
  font-weight: 700;
  color: #475569;
  margin-bottom: var(--spacing-4);
  word-break: break-all;
}

.card-instructions p {
  font-size: 0.85rem;
  color: #334155;
  margin-bottom: var(--spacing-2);
}

.logos-row-1,
.logos-row-2 {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
}

.logos-row-1 img {
  height: 26px;
  object-fit: contain;
}
.logos-row-2 {
  gap: 12px;
  margin-top: 12px;
}
.logos-row-2 img {
  height: 22px;
  object-fit: contain;
}

.card-footer {
  margin-top: var(--spacing-4);
  font-size: 0.8rem;
  color: #94a3b8;
}

.card-footer strong {
  color: #64748b;
}