/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Tokens ── */
:root {
  --green-900: #1b4332;
  --green-700: #2d6a4f;
  --green-500: #40916c;
  --green-300: #74c69d;
  --green-100: #d8f3dc;
  --cream:     #f6f9f4;
  --text:      #1a1a1a;
  --muted:     #5a6a5a;
  --radius:    12px;
  --shadow:    0 2px 14px rgba(0, 0, 0, 0.08);
}

/* ── Base ── */
body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--cream);
  color: var(--text);
  min-height: 100vh;
}

/* ── Pages ── */
.page {
  display: none;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem;
}
.page.active { display: flex; }

/* ── Layout ── */
.container        { max-width: 940px; width: 100%; }
.container.center { text-align: center; }
.criteria-container { max-width: 700px; }

h1 {
  font-size: clamp(2rem, 6vw, 3.6rem);
  color: var(--green-700);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}
h2 {
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  color: var(--green-700);
  font-weight: 700;
  margin-bottom: 0.6rem;
}
.subtitle {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

/* ── Buttons ── */
.btn {
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  transition: transform 0.12s, box-shadow 0.12s;
  line-height: 1;
}
.btn:hover  { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,0.13); }
.btn:active { transform: translateY(0);    box-shadow: none; }
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.btn-primary   { background: var(--green-700); color: #fff; padding: 0.9rem 2.8rem; font-size: 1.1rem; }
.btn-secondary { background: var(--green-500); color: #fff; padding: 0.75rem 1.8rem; }
.btn-outline   {
  background: transparent;
  color: var(--green-700);
  border: 2px solid var(--green-700);
  padding: 0.7rem 1.8rem;
}

/* ── Criteria form (page 2) ── */
.criteria-container h2 { margin-bottom: 1.75rem; }

.criteria-section { margin-bottom: 1.75rem; }

.criteria-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--green-700);
  margin-bottom: 0.75rem;
}
.label-hint {
  font-weight: 400;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
}

.criteria-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.criteria-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.field-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Zone choice ── */
.choice-group {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.btn-choice {
  background: #fff;
  border: 2px solid var(--green-100);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  min-width: 175px;
  box-shadow: var(--shadow);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.12s;
}
.btn-choice:hover {
  border-color: var(--green-500);
  background: #f0faf4;
  transform: translateY(-2px);
}
.btn-choice .icon   { font-size: 2.8rem; }
.btn-choice strong  { font-size: 1.05rem; }
.btn-choice small   { color: var(--muted); font-weight: 400; font-size: 0.82rem; }
.btn-choice.selected {
  border-color: var(--green-500);
  background: #f0faf4;
  box-shadow: 0 0 0 3px rgba(64, 145, 108, 0.2), var(--shadow);
}

/* ── Species exclusion ── */
.species-list {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.species-placeholder {
  color: var(--muted);
  font-size: 0.9rem;
  font-style: italic;
}
.species-group {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-width: 148px;
  flex: 1;
}
.species-group-label {
  padding: 0.45rem 0.75rem;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #fff;
}
.species-group-label.stratum-label-emergent { background: var(--green-900); }
.species-group-label.stratum-label-high     { background: var(--green-700); }
.species-group-label.stratum-label-medium   { background: var(--green-500); }
.species-group-label.stratum-label-low      { background: var(--green-300); color: var(--green-900); }

.species-check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  font-size: 0.88rem;
  border-top: 1px solid var(--green-100);
  transition: background 0.1s;
}
.species-check:hover { background: #f0faf4; }
.species-check input { accent-color: var(--green-500); cursor: pointer; }

/* ── Main crop select ── */
.crop-select {
  padding: 0.6rem 0.75rem;
  border: 2px solid var(--green-100);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text);
  background: #fff;
  box-shadow: var(--shadow);
  outline: none;
  cursor: pointer;
  min-width: 220px;
  transition: border-color 0.15s;
}
.crop-select:focus { border-color: var(--green-500); }

.main-crop-tag {
  display: inline-block;
  margin-left: 0.4rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--green-100);
  color: var(--green-700);
  vertical-align: middle;
}

/* ── Length + spacing inputs ── */
.length-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.length-input {
  width: 110px;
  padding: 0.6rem 0.75rem;
  border: 2px solid var(--green-100);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  background: #fff;
  box-shadow: var(--shadow);
  outline: none;
  transition: border-color 0.15s;
}
.length-input:focus { border-color: var(--green-500); }
.length-input::placeholder { color: #bbb; font-weight: 400; }
.unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--muted);
}
.spacing-group { display: flex; gap: 0.5rem; }
.btn-spacing {
  background: #fff;
  border: 2px solid var(--green-100);
  border-radius: var(--radius);
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, background 0.15s, transform 0.12s;
}
.btn-spacing:hover { border-color: var(--green-500); background: #f0faf4; transform: translateY(-1px); }
.btn-spacing.selected {
  border-color: var(--green-500);
  background: #f0faf4;
  color: var(--green-700);
  box-shadow: 0 0 0 3px rgba(64, 145, 108, 0.2), var(--shadow);
}

/* ── Result header (page 3) ── */
#page-3 h2        { margin-bottom: 0.3rem; }
#page-3 .subtitle { margin-bottom: 0; }

/* ── Line cards ── */
.line-cards {
  display: flex;
  gap: 0.7rem;
  overflow-x: auto;
  padding: 1.5rem 0 1rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--green-300) transparent;
}
.card {
  flex: 0 0 auto;
  width: 118px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
}
.card-header {
  padding: 0.55rem 0.4rem;
  text-align: center;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #fff;
}
.card-body {
  padding: 0.8rem 0.6rem;
  text-align: center;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}
.species-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}

/* ── Stratum colours ── */
.stratum-emergent .card-header { background: var(--green-900); }
.stratum-high     .card-header { background: var(--green-700); }
.stratum-medium   .card-header { background: var(--green-500); }
.stratum-low      .card-header { background: var(--green-300); color: var(--green-900); }

/* ── Actions ── */
.actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

/* ── Species summary (page 3) ── */
.summary-section {
  margin-top: 2.25rem;
  padding-top: 2rem;
  border-top: 1px solid var(--green-100);
}
.summary-section h3 {
  font-size: 1.05rem;
  color: var(--green-700);
  font-weight: 700;
  margin-bottom: 1rem;
}

.summary-tbl {
  width: auto;
  min-width: 320px;
  border-collapse: collapse;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}
.summary-tbl th {
  text-align: left;
  padding: 0.45rem 1rem 0.45rem 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-bottom: 2px solid var(--green-100);
}
.summary-tbl td {
  padding: 0.5rem 1rem 0.5rem 0.75rem;
  border-bottom: 1px solid var(--green-100);
}
.summary-tbl th.qty,
.summary-tbl td.qty { text-align: right; padding-right: 0.75rem; }
.summary-tbl tbody tr:hover td { background: #f0faf4; }

.summary-total td {
  font-weight: 700;
  color: var(--green-700);
  border-bottom: none;
  border-top: 2px solid var(--green-300);
}

/* ── Succession chips ── */
.succession-chip,
.succession-mini {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
}
.succession-chip  { font-size: 0.65rem; }
.succession-mini  { font-size: 0.7rem; margin-left: 0.35rem; vertical-align: middle; }

.succession-pioneer   { background: #e76f51; }
.succession-secondary { background: #adb5bd; }
.succession-climax    { background: #1b4332; }

.stratum-chip {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
}
.stratum-chip.stratum-emergent { background: var(--green-900); }
.stratum-chip.stratum-high     { background: var(--green-700); }
.stratum-chip.stratum-medium   { background: var(--green-500); }
.stratum-chip.stratum-low      { background: var(--green-300); color: var(--green-900); }

/* ── Responsive ── */
@media (max-width: 480px) {
  .page          { padding: 1.5rem 1rem; }
  .card          { width: 100px; }
  .species-name  { font-size: 0.8rem; }
  .actions       { justify-content: center; }
  .criteria-row  { gap: 1.25rem; }
}