/* ===== VARIABLES ===== */
:root {
  --font-display: 'Syne', sans-serif;
  --font-body: 'Instrument Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== DARK THEME ===== */
[data-theme="dark"] {
  --bg: #0a0a0f;
  --bg-card: #111118;
  --bg-input: #1a1a26;
  --bg-hover: #1e1e2e;
  --border: rgba(255,255,255,0.08);
  --border-focus: rgba(99,179,237,0.5);
  --text-primary: #f0f0f8;
  --text-secondary: #8888aa;
  --text-muted: #555570;
  --accent: #63b3ed;
  --accent-glow: rgba(99,179,237,0.15);
  --accent-2: #f687b3;
  --step-num: rgba(99,179,237,0.2);
  --tag-bg: rgba(99,179,237,0.1);
  --tag-border: rgba(99,179,237,0.25);
  --card-shadow: 0 4px 40px rgba(0,0,0,0.5);
  --grid-color: rgba(255,255,255,0.03);
  --glow: rgba(99,179,237,0.08);
  --result-bg: #0d0d18;
  --modal-overlay: rgba(0,0,0,0.7);
  --condition-active-bg: rgba(99,179,237,0.12);
  --condition-active-border: rgba(99,179,237,0.4);
  --generate-gradient: linear-gradient(135deg, #3b82f6, #63b3ed);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg: #f5f5fa;
  --bg-card: #ffffff;
  --bg-input: #f8f8fc;
  --bg-hover: #f0f0f8;
  --border: rgba(0,0,0,0.08);
  --border-focus: rgba(37,99,235,0.5);
  --text-primary: #0f0f1a;
  --text-secondary: #5555778;
  --text-muted: #9999b8;
  --accent: #2563eb;
  --accent-glow: rgba(37,99,235,0.1);
  --accent-2: #db2777;
  --step-num: rgba(37,99,235,0.1);
  --tag-bg: rgba(37,99,235,0.06);
  --tag-border: rgba(37,99,235,0.2);
  --card-shadow: 0 4px 40px rgba(0,0,0,0.1);
  --grid-color: rgba(0,0,0,0.025);
  --glow: rgba(37,99,235,0.05);
  --result-bg: #f0f0f8;
  --modal-overlay: rgba(0,0,0,0.4);
  --condition-active-bg: rgba(37,99,235,0.08);
  --condition-active-border: rgba(37,99,235,0.35);
  --generate-gradient: linear-gradient(135deg, #1d4ed8, #3b82f6);
  --text-secondary: #555577;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ===== BACKGROUND ===== */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ===== HEADER ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(var(--bg), 0.8);
  border-bottom: 1px solid var(--border);
}

[data-theme="dark"] header { background: rgba(10,10,15,0.8); }
[data-theme="light"] header { background: rgba(245,245,250,0.85); }

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.x-icon {
  width: 20px;
  height: 20px;
  color: var(--accent);
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 30px;
  cursor: pointer;
  padding: 6px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: border-color var(--transition), background var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); background: var(--accent-glow); }

.toggle-track {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
}
.icon-sun, .icon-moon { width: 14px; height: 14px; color: var(--text-secondary); }
[data-theme="dark"] .icon-moon { color: var(--accent); }
[data-theme="light"] .icon-sun { color: var(--accent); }

/* ===== MAIN ===== */
main {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 60px 24px 100px;
}

/* ===== HERO ===== */
.hero {
  text-align: center;
  margin-bottom: 48px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 16px;
}

.hero .accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== BUILDER CARD ===== */
.builder-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: background var(--transition);
}

/* ===== STEP ===== */
.step {
  padding: 32px 36px;
  border-bottom: 1px solid var(--border);
  animation: stepIn 0.3s ease forwards;
}
.step:last-child { border-bottom: none; }

@keyframes stepIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.step-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  background: var(--step-num);
  border: 1px solid var(--tag-border);
  border-radius: 6px;
  padding: 3px 8px;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.step-header h2 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* ===== CONDITION GRID ===== */
.condition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

.condition-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-input);
  user-select: none;
}
.condition-item:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-1px);
}
.condition-item.active {
  border-color: var(--condition-active-border);
  background: var(--condition-active-bg);
}
.condition-item.active .cond-icon { color: var(--accent); }

.cond-icon {
  font-size: 16px;
  flex-shrink: 0;
  line-height: 1;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.cond-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
}

/* ===== INPUTS AREA ===== */
.inputs-area {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: stepIn 0.25s ease forwards;
  position: relative;
}

.input-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.input-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.input-group .remove-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 2px;
  display: flex;
  align-items: center;
  border-radius: 4px;
  transition: color var(--transition), background var(--transition);
}
.input-group .remove-btn:hover { color: #f87171; background: rgba(248,113,113,0.1); }
.input-group .remove-btn svg { width: 14px; height: 14px; }

.input-field {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-primary);
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.input-field:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.input-field::placeholder { color: var(--text-muted); }

.input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.input-hint {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.hint-block {
  font-size: 12px;
  font-family: var(--font-body);
  color: var(--text-secondary);
  background: var(--accent-glow);
  border: 1px solid var(--tag-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  line-height: 1.6;
  margin-top: 2px;
}

/* Radio & Checkbox group */
.radio-group, .checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.radio-item, .checkbox-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border: 1px solid var(--border);
  border-radius: 30px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all var(--transition);
  user-select: none;
}
.radio-item:hover, .checkbox-item:hover { border-color: var(--accent); color: var(--text-primary); }
.radio-item.selected, .checkbox-item.selected {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 500;
}
.radio-item input, .checkbox-item input { display: none; }

/* Add condition btn */
.add-condition-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  background: none;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  width: 100%;
  justify-content: center;
  transition: all var(--transition);
  font-family: var(--font-body);
}
.add-condition-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}
.add-condition-btn svg { width: 14px; height: 14px; }

/* ===== GENERATE BUTTON ===== */
.generate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--generate-gradient);
  color: #fff;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: all var(--transition-bounce);
  box-shadow: 0 4px 20px rgba(99,179,237,0.25);
}
.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99,179,237,0.35);
}
.generate-btn:active { transform: translateY(0); }
.generate-btn svg { width: 18px; height: 18px; }

/* ===== RESULT AREA ===== */
.result-area {
  padding: 32px 36px;
  background: var(--result-bg);
  border-top: 1px solid var(--border);
  animation: stepIn 0.3s ease forwards;
}

.result-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.result-code {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  word-break: break-all;
  line-height: 1.7;
  min-height: 60px;
  margin-bottom: 20px;
  white-space: pre-wrap;
}

.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--border);
}
.action-btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.copy-btn {
  background: var(--bg-card);
  color: var(--text-primary);
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }
.copy-btn.copied { color: #4ade80; border-color: #4ade80; background: rgba(74,222,128,0.1); }

.search-btn {
  background: #000;
  color: #fff;
  border-color: #000;
}
[data-theme="light"] .search-btn { background: #0f0f1a; }
.search-btn:hover { opacity: 0.85; }

.reset-btn {
  background: none;
  color: var(--text-secondary);
  margin-left: auto;
}
.reset-btn:hover { color: #f87171; border-color: #f87171; background: rgba(248,113,113,0.08); }

/* ===== SELECTED TAGS ===== */
.selected-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  min-height: 0;
  transition: all var(--transition);
}

.tag {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 30px;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  animation: tagIn 0.2s var(--transition-bounce) forwards;
}

@keyframes tagIn {
  from { opacity: 0; transform: scale(0.8); }
  to   { opacity: 1; transform: scale(1); }
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  animation: modalIn 0.3s var(--transition-bounce);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.93) translateY(10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-card);
  z-index: 1;
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: var(--bg-hover); color: var(--text-primary); }
.modal-close svg { width: 16px; height: 16px; }

.modal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
  padding: 20px 28px 28px;
}

/* ===== FOOTER ===== */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 20px 32px;
  margin-top: 0;
}

.footer-inner {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-sep {
  color: var(--text-muted);
  font-size: 12px;
}

.footer-link {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--text-secondary);
  padding: 2px 4px;
  border-radius: 4px;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: transparent;
  transition: all var(--transition);
}
a.footer-link {
  display: inline-flex;
  align-items: center;
}
.footer-link:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ===== LEGAL MODAL ===== */
.legal-modal {
  max-width: 640px !important;
}

.legal-body {
  padding: 24px 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.legal-updated {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.legal-body h4 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.01em;
  margin-bottom: -10px;
}

.legal-body p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.legal-body ul {
  margin: -6px 0 0 0;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.legal-body ul li {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  header { padding: 12px 16px; }
  main { padding: 40px 12px 80px; }
  .step { padding: 24px 20px; }
  .result-area { padding: 24px 20px; }
  .condition-grid { grid-template-columns: 1fr 1fr; }
  .input-row { grid-template-columns: 1fr; }
  .result-actions { flex-direction: column; }
  .reset-btn { margin-left: 0; }
}