:root {
  --bg-primary: #090a0f;
  --bg-card: rgba(17, 18, 25, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #06c755; /* LINE Brand Green */
  --text-primary: #f4f4f7;
  --text-secondary: #a1a1aa;
  --primary-accent: #06c755;
  --primary-accent-hover: #05b04b;
  --error-color: #ef4444;
  --success-color: #10b981;
  --font-family: 'Outfit', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition-speed: 0.3s;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
  padding: 20px;
}

/* Ambient glow backgrounds */
.background-glow-1 {
  position: absolute;
  top: -10%;
  left: -10%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(6, 199, 85, 0.08) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

.background-glow-2 {
  position: absolute;
  bottom: -10%;
  right: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.06) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: 480px;
  z-index: 10;
}

/* Premium Glassmorphic Card */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px 32px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 
              inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

@media (max-width: 480px) {
  .card {
    padding: 32px 20px;
  }
}

.card:hover {
  border-color: rgba(6, 199, 85, 0.2);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5), 
              inset 0 1px 0 rgba(255, 255, 255, 0.15),
              0 0 30px rgba(6, 199, 85, 0.05);
}

/* Header styling */
.card-header {
  text-align: center;
  margin-bottom: 32px;
}

.line-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(6, 199, 85, 0.12);
  color: var(--primary-accent);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  border: 1px solid rgba(6, 199, 85, 0.2);
  margin-bottom: 16px;
}

.line-icon {
  width: 16px;
  height: 16px;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #ffffff 0%, #d1d5db 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* User profile details box */
.profile-preview {
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 28px;
}

.avatar-container {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  overflow: hidden;
  background-color: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-info {
  display: flex;
  flex-direction: column;
}

.profile-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.profile-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.profile-uid {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
  font-family: monospace;
}

/* Form inputs & structure */
.form-group {
  margin-bottom: 24px;
  position: relative;
}

label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: #e4e4e7;
}

.required {
  color: var(--error-color);
  margin-left: 2px;
}

.input-wrapper {
  position: relative;
  width: 100%;
}

.input-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--text-secondary);
  pointer-events: none;
}

input[type="text"],
input[type="email"] {
  width: 100%;
  padding: 14px 16px 14px 46px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 1rem;
  transition: all var(--transition-speed) ease;
}

input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(6, 199, 85, 0.15);
}

input::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

/* Error feedback formatting */
.error-msg {
  display: block;
  font-size: 0.8rem;
  color: var(--error-color);
  margin-top: 6px;
  opacity: 0;
  transform: translateY(-4px);
  transition: all 0.2s ease;
  pointer-events: none;
}

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

.form-group.invalid .error-msg {
  opacity: 1;
  transform: translateY(0);
}

/* UTM preview tags */
.utm-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.utm-tag {
  font-size: 0.75rem;
  padding: 4px 8px;
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: monospace;
}

/* Button & Loading styles */
.submit-btn {
  width: 100%;
  padding: 16px;
  background-color: var(--primary-accent);
  color: #ffffff;
  border: none;
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  box-shadow: 0 4px 12px rgba(6, 199, 85, 0.2);
}

.submit-btn:hover:not(:disabled) {
  background-color: var(--primary-accent-hover);
  box-shadow: 0 6px 16px rgba(6, 199, 85, 0.3);
  transform: translateY(-1px);
}

.submit-btn:active:not(:disabled) {
  transform: translateY(1px);
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 1s ease-in-out infinite;
}

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

/* Success Card details */
.success-card {
  text-align: center;
}

.success-icon-container {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.success-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
  border: 2px solid rgba(16, 185, 129, 0.2);
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
  animation: scaleUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.check-icon {
  width: 36px;
  height: 36px;
}

.success-card h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
  color: #ffffff;
}

.success-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
}

.redirect-info {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.redirect-countdown {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 12px;
}

#countdown_sec {
  color: var(--primary-accent);
  font-weight: 700;
  font-size: 1.1rem;
}

.redirect-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.redirect-btn {
  display: inline-block;
  text-decoration: none;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
}

.redirect-btn:hover {
  background-color: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

@keyframes scaleUp {
  from { transform: scale(0.8); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Toast Notifications styling */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(23, 23, 23, 0.95);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  opacity: 0;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(30, 10, 10, 0.95);
  color: #fca5a5;
}

/* QR Code for PC/Desktop success state */
.qr-container {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: scaleUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.qr-wrapper {
  background: #ffffff;
  padding: 12px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 12px;
}

.qr-code-img {
  width: 160px;
  height: 160px;
  display: block;
}

.qr-text-hint {
  font-size: 0.9rem !important;
  color: var(--primary-accent) !important;
  font-weight: 500;
}