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

:root {
  --orange: #f5a623;
  --orange-dark: #d4881a;
  --blue: #4a9eff;
  --dark: #0f1117;
  --dark2: #181c24;
  --dark3: #1e2330;
  --dark4: #252b3b;
  --text: #e8ecf0;
  --text-muted: #7a8594;
  --green: #4caf7d;
  --red: #e05a4e;
  --radius: 10px;
  --border: rgba(255,255,255,0.08);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.6;
}

/* HEADER */
.header {
  background: var(--dark2);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-icon { font-size: 1.6rem; }

.logo-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: -0.3px;
}

.logo-text strong {
  color: var(--orange);
  font-weight: 800;
}

.header-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  border-left: 1px solid var(--border);
  padding-left: 1.5rem;
}

/* MAIN */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* SECTION */
.section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text);
}

.section-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: -0.75rem;
}

/* SUGGESTIONS */
.suggestions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.suggestion-card {
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
}

.suggestion-card:hover {
  border-color: var(--orange);
  background: var(--dark4);
  transform: translateY(-2px);
}

.suggestion-tier {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--orange);
  margin-bottom: 0.4rem;
}

.suggestion-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.suggestion-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* PLANNER FORM */
.planner-section {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
}

.planner-form {
  display: flex;
  gap: 1rem;
  align-items: flex-end;
  flex-wrap: wrap;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group select,
.form-group input {
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s;
  height: 42px;
}

.form-group select { min-width: 260px; }
.form-group input  { width: 140px; }

.form-group select:focus,
.form-group input:focus {
  border-color: var(--orange);
}

.calc-btn {
  background: var(--orange);
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 0 1.5rem;
  height: 42px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}

.calc-btn:hover {
  background: var(--orange-dark);
  transform: translateY(-1px);
}

/* RESULTS */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.25rem;
  align-items: start;
}

.result-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.result-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.result-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* TREE */
.tree-output {
  overflow-x: auto;
}

.tree-node {
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--dark4);
  margin: 0.35rem 0;
}

.tree-node.root-node {
  padding-left: 0;
  border-left: none;
}

.tree-node.raw-resource > .node-header {
  opacity: 0.7;
}

.node-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.75rem;
  background: var(--dark3);
  border-radius: 6px;
  margin-bottom: 0.2rem;
  flex-wrap: wrap;
  transition: background 0.1s;
}

.root-node > .node-header {
  background: rgba(245,166,35,0.12);
  border: 1px solid rgba(245,166,35,0.3);
}

.raw-resource > .node-header {
  background: rgba(76,175,125,0.08);
}

.item-icon { font-size: 1rem; }

.item-name {
  font-size: 0.9rem;
  font-weight: 600;
  flex: 1;
  min-width: 120px;
}

.item-qty {
  font-size: 0.8rem;
  color: var(--orange);
  font-weight: 700;
  white-space: nowrap;
}

.machine-tag {
  font-size: 0.72rem;
  background: var(--dark4);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.tree-children {
  padding-left: 1rem;
  border-left: 1px dashed var(--dark4);
  margin-top: 0.35rem;
}

/* SUMMARY LIST */
.summary-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  gap: 0.5rem;
}

.summary-item:last-child { border-bottom: none; }

.summary-item span { color: var(--text-muted); }
.summary-item strong { color: var(--orange); font-size: 0.9rem; }

/* ITEMS GRID */
.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.item-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.item-card:hover {
  border-color: var(--orange);
  background: var(--dark3);
}

.item-card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.4rem;
}

.item-card-name {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.item-card-machine {
  font-size: 0.75rem;
  color: var(--orange);
  margin-bottom: 0.25rem;
}

.item-card-inputs {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
}

/* RESPONSIVE */
@media (max-width: 860px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .header { padding: 1rem; }
  .header-sub { display: none; }
  .planner-form { flex-direction: column; }
  .form-group select,
  .form-group input { min-width: 100%; width: 100%; }
  .calc-btn { width: 100%; }
}