/* ======================================================================
   USDA Zone Finder — Best Garden Channel
   Gardening palette: deep forest greens, warm earth tones, soft cream.
   Approachable serif headlines + clean sans-serif body.
   ====================================================================== */

:root {
  /* Greens */
  --green-900: #1f3a1f;
  --green-700: #2d5016;
  --green-600: #4a7c2c;
  --green-500: #6b9444;
  --green-300: #b5c99a;
  --green-100: #e6efd7;
  --green-50:  #f5f9ee;

  /* Earth */
  --earth-900: #3a2e1f;
  --earth-700: #6b5538;
  --earth-500: #a08661;

  /* Neutrals */
  --cream:     #faf7f0;
  --paper:     #ffffff;
  --ink:       #1a2e1a;
  --ink-soft:  #4a5d4a;
  --ink-muted: #7a8d7a;
  --line:      #e2e8d8;

  /* Accent */
  --tomato:    #c44536;
  --honey:     #d9a441;

  /* Type */
  --font-display: 'Lora', Georgia, 'Times New Roman', serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;

  --radius:    14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(31, 58, 31, 0.06);
  --shadow:    0 8px 24px rgba(31, 58, 31, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(ellipse at top, var(--green-50) 0%, var(--cream) 50%, var(--cream) 100%);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--green-700);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { color: var(--green-900); }

/* ====================================================================== */
/* Layout                                                                 */
/* ====================================================================== */

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ====================================================================== */
/* Brand header                                                           */
/* ====================================================================== */

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
  color: var(--green-700);
}
.brand__mark { display: inline-flex; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

/* ====================================================================== */
/* Card                                                                   */
/* ====================================================================== */

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-7) var(--space-6);
  box-shadow: var(--shadow);
}

.card--results {
  margin-top: var(--space-5);
}

/* ====================================================================== */
/* Headline / subhead                                                     */
/* ====================================================================== */

.headline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 4.5vw, 2.25rem);
  line-height: 1.2;
  margin: 0 0 var(--space-4);
  color: var(--green-900);
  letter-spacing: -0.01em;
}

.subhead {
  margin: 0 0 var(--space-6);
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* ====================================================================== */
/* Form                                                                   */
/* ====================================================================== */

.field {
  margin-bottom: var(--space-5);
}

.field label {
  display: block;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  margin-bottom: var(--space-2);
}

.field input {
  width: 100%;
  font-family: inherit;
  font-size: 1.05rem;
  padding: 0.95rem 1rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--cream);
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
  -webkit-appearance: none;
  appearance: none;
}

.field input::placeholder { color: var(--ink-muted); }

.field input:hover { border-color: var(--green-300); }

.field input:focus {
  outline: none;
  border-color: var(--green-600);
  box-shadow: 0 0 0 3px var(--green-100);
  background: var(--paper);
}

.field input.is-invalid {
  border-color: var(--tomato);
  background: #fff5f4;
}

.field__error {
  margin: var(--space-2) 0 0;
  font-size: 0.875rem;
  color: var(--tomato);
  min-height: 1.2em;
}

/* ====================================================================== */
/* CTA button                                                             */
/* ====================================================================== */

.cta {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin-top: var(--space-4);
  padding: 1.05rem 1.5rem;
  background: var(--green-700);
  color: white;
  font-family: inherit;
  font-weight: 600;
  font-size: 1.05rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  text-decoration: none;
  text-align: center;
}

.cta:hover:not(:disabled) {
  background: var(--green-900);
  box-shadow: 0 4px 12px rgba(31, 58, 31, 0.2);
}
.cta:active:not(:disabled) { transform: translateY(1px); }

.cta:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.cta--secondary {
  background: var(--honey);
  color: var(--earth-900);
}
.cta--secondary:hover:not(:disabled) {
  background: #c89230;
  color: var(--earth-900);
}

.cta__spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.cta.is-loading .cta__spinner { display: inline-block; }
.cta.is-loading .cta__label   { opacity: 0.7; }

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

.fineprint {
  margin-top: var(--space-4);
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

/* ====================================================================== */
/* Results                                                                */
/* ====================================================================== */

.result-badge {
  text-align: center;
  padding: var(--space-6) 0 var(--space-5);
  border-bottom: 1px solid var(--line);
  margin-bottom: var(--space-5);
}

.result-badge__label {
  display: block;
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

.result-badge__zone {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.5rem, 12vw, 5rem);
  line-height: 1;
  color: var(--green-700);
  letter-spacing: -0.02em;
}

.result-location {
  margin: 0 0 var(--space-2);
  text-align: center;
  font-size: 1rem;
  color: var(--ink-soft);
}

.result-temp {
  margin: 0 0 var(--space-6);
  text-align: center;
  font-size: 1.05rem;
  color: var(--ink);
  font-weight: 500;
}

.result-section {
  padding: var(--space-5) 0;
  border-top: 1px solid var(--line);
}
.result-section:first-of-type { border-top: none; padding-top: 0; }

.result-section h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--green-900);
}

.result-section p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.6;
}

.result-section--cta {
  text-align: center;
}

/* Frost dates grid */
.frost-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-3);
}

.frost-grid > div {
  background: var(--green-50);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-2);
  text-align: center;
}

.frost-label {
  display: block;
  font-size: 0.75rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.frost-value {
  display: block;
  font-weight: 600;
  font-size: 1rem;
  color: var(--green-900);
}

/* Planting list */
.result-planting-note {
  margin-bottom: var(--space-3) !important;
  font-style: italic;
}

.planting-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}
.planting-list li {
  background: var(--green-100);
  color: var(--green-900);
  padding: 0.4rem 0.85rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Link-style button (reset) */
.link-btn {
  display: inline-block;
  margin-top: var(--space-4);
  background: none;
  border: none;
  color: var(--green-700);
  font-family: inherit;
  font-size: 0.95rem;
  text-decoration: underline;
  cursor: pointer;
  padding: var(--space-2);
}
.link-btn:hover { color: var(--green-900); }

/* ====================================================================== */
/* Footer                                                                 */
/* ====================================================================== */

.footer {
  margin-top: auto;
  padding-top: var(--space-6);
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-muted);
}
.footer a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
}
.footer a:hover { color: var(--green-700); }

/* ====================================================================== */
/* Mobile                                                                 */
/* ====================================================================== */

@media (max-width: 480px) {
  .container { padding: var(--space-5) var(--space-3); }
  .card      { padding: var(--space-6) var(--space-4); }
  .frost-grid { grid-template-columns: 1fr; }
  .frost-grid > div { text-align: left; padding: var(--space-3); display: flex; justify-content: space-between; align-items: center; }
  .frost-label { margin-bottom: 0; }
}

/* Avoid iOS zoom on input focus */
@media screen and (max-width: 768px) {
  .field input { font-size: 16px; }
}