@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --text-color: #0f172a;
  --muted-color: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #16a34a;
  --warning: #f97316;
  --shadow: 0 20px 45px -20px rgba(15, 23, 42, 0.4);
}

body {
  font-family: 'Inter', 'Microsoft Yahei', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
}

.ai-wrapper {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 20px 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.ai-hero {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(14, 165, 233, 0.1));
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 20px;
  padding: 28px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  box-shadow: var(--shadow);
}

.ai-hero h1 {
  font-size: 28px;
  margin-bottom: 10px;
}

.ai-hero p {
  color: var(--muted-color);
  line-height: 1.5;
}

.ai-hero .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.hero-tag {
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
}

.ai-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.ai-card h2 {
  font-size: 22px;
  margin-bottom: 10px;
}

.ai-card > p {
  color: var(--muted-color);
  margin-bottom: 24px;
}

.form-grid {
  display: grid;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-weight: 600;
  font-size: 15px;
}

.form-group small {
  color: var(--muted-color);
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  outline: none;
}

.button-row {
  display: flex;
  gap: 12px;
  margin-top: 4px;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-outline {
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-color);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  margin-top: 12px;
}

.status-pill.success {
  background: rgba(22, 163, 74, 0.12);
  color: var(--success);
}

.status-pill.warning {
  background: rgba(249, 115, 22, 0.12);
  color: var(--warning);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 16px;
}

.tip-card {
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 18px;
  background: #fefefe;
}

.tip-card strong {
  display: block;
  margin-bottom: 8px;
}

.message-toast {
  position: fixed;
  top: 24px;
  right: 24px;
  padding: 14px 20px;
  border-radius: 12px;
  color: #fff;
  font-weight: 600;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(-10px);
  animation: toast-in 0.3s forwards;
  z-index: 999;
}

.message-toast.success {
  background: var(--success);
}

.message-toast.error {
  background: #dc2626;
}

@keyframes toast-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .ai-hero {
    flex-direction: column;
    padding: 22px;
  }

  .ai-card {
    padding: 22px;
  }

  .button-row {
    flex-direction: column;
  }
}