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

:root {
  --green: #1D9E75;
  --green-dark: #0F6E56;
  --green-light: #E1F5EE;
  --green-mid: #9FE1CB;
  --text-main: #111;
  --text-muted: #6B7280;
  --text-hint: #9CA3AF;
  --border: rgba(0,0,0,0.1);
  --bg: #F7F8FA;
  --white: #fff;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Sora', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: var(--sans);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 800px; margin: 0 auto; padding: 2rem 1rem; }

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
}
.logo svg { width: 32px; height: 32px; color: var(--green); }
.logo span { font-style: italic; color: var(--green); }

.pro-banner {
  background: var(--green-light);
  color: var(--green-dark);
  text-align: center;
  padding: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  margin-bottom: 2rem;
  display: none;
}
.pro-banner.active { display: block; }

h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  font-weight: 600;
}

/* Example Chips */
.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.chip {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}
.chip:hover {
  border-color: var(--green);
  color: var(--green-dark);
  background: var(--green-light);
  transform: translateY(-1px);
}

/* Input Area */
.input-section {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  position: relative;
  transition: box-shadow 0.2s ease;
}
.input-section:focus-within {
  box-shadow: 0 0 0 2px var(--green-light), var(--shadow);
  border-color: var(--green);
}

textarea {
  width: 100%;
  border: none;
  resize: none;
  font-family: inherit;
  font-size: 1.125rem;
  color: var(--text-main);
  background: transparent;
  outline: none;
  min-height: 120px;
}
textarea::placeholder { color: var(--text-hint); }

.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}
.char-count { font-size: 0.875rem; color: var(--text-hint); }

.btn {
  background: var(--green);
  color: var(--white);
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}
.btn:hover { background: var(--green-dark); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}
.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  background: var(--bg);
  color: var(--text-main);
}

/* Loader */
.loader-container {
  display: none;
  text-align: center;
  padding: 3rem 0;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.loader-container.active { display: flex; }
.dots {
  display: flex;
  gap: 0.5rem;
}
.dot {
  width: 12px;
  height: 12px;
  background: var(--green);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}
.dot:nth-child(1) { animation-delay: -0.32s; }
.dot:nth-child(2) { animation-delay: -0.16s; }
@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* Result Area */
.result-section {
  display: none;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--green-mid);
  overflow: hidden;
  box-shadow: var(--shadow);
  animation: slideUp 0.4s ease forwards;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.result-section.active { display: block; }

.result-header {
  background: var(--green);
  padding: 1rem 1.5rem;
  color: var(--white);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.badge {
  background: rgba(255,255,255,0.2);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1px;
}
.formula-box {
  background: var(--green-light);
  padding: 1.5rem;
  font-family: var(--mono);
  font-size: 1.25rem;
  color: var(--green-dark);
  word-break: break-all;
  border-bottom: 1px solid var(--border);
}
.explanation-box { padding: 1.5rem; }
.explanation-box h3 {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.explanation-box p { font-size: 1.125rem; margin-bottom: 1.5rem; }

.parts-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.part-item {
  display: flex;
  gap: 1rem;
  background: var(--bg);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
}
.part-code {
  font-family: var(--mono);
  background: var(--white);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-size: 0.875rem;
  white-space: nowrap;
}
.part-desc { font-size: 0.875rem; align-self: center; }

.advice-box {
  margin: 1.5rem 1.5rem;
  padding: 1rem;
  background: #FEF9C3;
  border-left: 4px solid #EAB308;
  border-radius: 4px;
  color: #854D0E;
  font-size: 0.875rem;
}

.actions {
  padding: 1.5rem;
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--border);
}

footer {
  text-align: center;
  margin-top: 4rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}
footer a { color: var(--green); text-decoration: none; font-weight: 500; }
footer a:hover { text-decoration: underline; }

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}
@media (min-width: 640px) {
  .pricing-grid { grid-template-columns: 1fr 1fr; }
}
.plan-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
}
.plan-card.pro {
  border: 2px solid var(--green);
  box-shadow: var(--shadow);
}
.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--green);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: bold;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  letter-spacing: 1px;
}
.plan-price { font-size: 2.5rem; font-weight: bold; margin: 1rem 0; }
.plan-price span { font-size: 1rem; color: var(--text-muted); font-weight: normal; }
.plan-features { list-style: none; margin: 1.5rem 0; }
.plan-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}
.feature-check { color: var(--green); }
.feature-cross { color: var(--text-hint); }

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal-content {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--radius);
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow);
  transform: translateY(20px);
  transition: transform 0.2s;
}
.modal-overlay.active .modal-content { transform: translateY(0); }
.modal-close {
  float: right;
  background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-muted);
}
.input-group { margin-top: 1.5rem; }
.input-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; font-size: 0.875rem; }
.input-group input {
  width: 100%; padding: 0.75rem; border-radius: var(--radius-sm); border: 1px solid var(--border);
  font-family: inherit; font-size: 1rem; outline: none;
}
.input-group input:focus { border-color: var(--green); }

.error-msg {
  color: #DC2626; font-size: 0.875rem; margin-top: 0.5rem; display: none;
}
.limit-msg {
    background: #FEE2E2; border: 1px solid #F87171; border-radius: 8px; padding: 1rem; color: #991B1B; margin-top: 1rem; display: none;
}
.limit-msg a { color: #DC2626; font-weight: bold; }