:root {
  --bg-dark: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.7);
  --border-color: rgba(255, 255, 255, 0.1);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --secondary-bg: rgba(51, 65, 85, 0.6);
  --secondary-hover: rgba(71, 85, 105, 0.8);
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --radius: 16px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
  color: var(--text-main);
  min-height: 100vh;
  padding: 40px 20px;
}

.app-container {
  max-width: 860px;
  margin: 0 auto;
}

.hero-header {
  text-align: center;
  margin-bottom: 36px;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 9999px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #60a5fa;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 14px;
}

.hero-header h1 {
  font-size: 36px;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}

.form-section {
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.form-section:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.form-section h2 {
  font-size: 18px;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 6px;
}

.section-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="time"],
select,
textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  color: var(--text-main);
  font-size: 14px;
  transition: all 0.2s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="time"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

textarea {
  resize: vertical;
  line-height: 1.5;
}

.sub-options-box {
  margin-top: 18px;
  padding: 18px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px dashed rgba(59, 130, 246, 0.3);
  border-radius: 12px;
}

.sub-options-box h3 {
  font-size: 14px;
  font-weight: 600;
  color: #93c5fd;
  margin-bottom: 12px;
}

.sub-grid {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.sub-card {
  padding: 10px 12px;
  background: rgba(30, 41, 59, 0.5);
  border-color: rgba(255, 255, 255, 0.05);
}

.sub-card:hover {
  background: rgba(59, 130, 246, 0.15);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.checkbox-card {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.checkbox-card:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
}

.checkbox-card input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-primary);
  margin-right: 12px;
  cursor: pointer;
}

.label-text {
  font-size: 13px;
  font-weight: 500;
  color: #e2e8f0;
}

.audio-card {
  padding: 16px;
  background: rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.3);
}

.button-group {
  display: flex;
  gap: 16px;
  margin-top: 24px;
}

.btn {
  flex: 1;
  padding: 14px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--secondary-bg);
  color: #f1f5f9;
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--secondary-hover);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.status-message {
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 13.5px;
  margin-top: 20px;
  line-height: 1.4;
}

.status-message.hidden {
  display: none;
}

.status-message.success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

.status-message.info {
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #93c5fd;
}

.status-message.error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.subscribers-card h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.subscribers-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sub-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
}

.sub-info h4 {
  font-size: 14px;
  color: #f1f5f9;
  margin-bottom: 4px;
}

.sub-info p {
  font-size: 12px;
  color: var(--text-muted);
}

.sub-badge {
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
  font-weight: 600;
}

footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 40px;
}

@media (max-width: 640px) {
  .form-row, .button-group {
    grid-template-columns: 1fr;
    flex-direction: column;
  }
}