/* ============================================================
   style.css — CAD2GEO Dark Theme
   ============================================================ */

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

:root {
  /* Palette */
  --bg:            #07091a;
  --bg-2:          #0d1124;
  --surface:       rgba(255,255,255,0.045);
  --surface-hover: rgba(255,255,255,0.07);
  --border:        rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.14);

  /* Accent */
  --accent:        #00d4aa;
  --accent-2:      #0ea5e9;
  --accent-glow:   rgba(0,212,170,0.18);
  --accent-dim:    rgba(0,212,170,0.12);

  /* Text */
  --text:          #f0f4f8;
  --text-muted:    #7d8fa8;
  --text-faint:    #4a5568;

  /* Semantic */
  --success:       #10d48a;
  --error:         #f0556a;
  --warning:       #f5a623;

  /* Spacing */
  --radius:        14px;
  --radius-sm:     8px;
  --radius-lg:     20px;

  /* Transitions */
  --t:             0.2s ease;
  --t-slow:        0.4s ease;
}

/* ── Base ────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Background orbs ─────────────────────────────────────── */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.18;
  animation: drift 20s ease-in-out infinite alternate;
}
.orb-1 {
  width: 640px; height: 640px;
  background: radial-gradient(circle, #00d4aa, transparent 70%);
  top: -200px; left: -200px;
  animation-duration: 22s;
}
.orb-2 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, #0ea5e9, transparent 70%);
  top: 40%; right: -150px;
  animation-duration: 28s;
  animation-delay: -8s;
}
.orb-3 {
  width: 360px; height: 360px;
  background: radial-gradient(circle, #6366f1, transparent 70%);
  bottom: 10%; left: 30%;
  animation-duration: 18s;
  animation-delay: -4s;
}
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, 60px) scale(1.05); }
}

/* ── Header ──────────────────────────────────────────────── */
.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(7,9,26,0.75);
}
.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-icon svg { width: 36px; height: 36px; }
.logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}
.logo-text .accent { color: var(--accent); }

.header-nav { display: flex; align-items: center; gap: 16px; }
.nav-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--t);
}
.nav-link:hover { color: var(--accent); }

.badge-version {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(0,212,170,0.25);
  letter-spacing: 0.5px;
}

/* ── Main layout ─────────────────────────────────────────── */
.main-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ── Hero ────────────────────────────────────────────────── */
.hero { text-align: center; padding: 24px 0 8px; }
.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Glass card ──────────────────────────────────────────── */
.glass-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition: border-color var(--t);
}
.glass-card:hover { border-color: var(--border-strong); }

/* ── Section title ───────────────────────────────────────── */
.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.section-title h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.2px;
}
.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid rgba(0,212,170,0.3);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}
.step-badge.accent { background: var(--accent); color: #07091a; }

.entity-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-left: auto;
}
.badge-chip {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
  background: var(--surface-hover);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
}

.mt-lg { margin-top: 28px; }

/* ── Drop Zone ───────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 44px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--t), background var(--t), transform var(--t);
  position: relative;
  outline: none;
}
.drop-zone:hover,
.drop-zone:focus-visible {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(0,212,170,0.08);
  transform: scale(1.01);
}
.drop-icon {
  margin: 0 auto 16px;
  width: 56px; height: 56px;
  color: var(--accent);
  opacity: 0.8;
}
.drop-label {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 8px;
}
.drop-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.drop-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ── File info ───────────────────────────────────────────── */
.file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  padding: 12px 16px;
  background: rgba(0,212,170,0.07);
  border: 1px solid rgba(0,212,170,0.2);
  border-radius: var(--radius-sm);
  animation: slideDown 0.25s ease;
}
.file-info-icon { font-size: 1.4rem; }
.file-info-details { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.file-name-text {
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-size-text { font-size: 0.78rem; color: var(--text-muted); }
.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--t), background var(--t);
}
.btn-icon svg { width: 18px; height: 18px; display: block; }
.btn-icon:hover { color: var(--error); background: rgba(240,85,106,0.1); }

/* ── Config grid ─────────────────────────────────────────── */
.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 14px;
}
@media (max-width: 600px) {
  .config-grid { grid-template-columns: 1fr 1fr; }
}

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}
.label-hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-faint);
  display: block;
  margin-top: 2px;
}

.form-select,
.form-input {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 10px 14px;
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color var(--t), box-shadow var(--t);
  outline: none;
  -webkit-appearance: none;
}
.form-select:focus,
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-select {
  padding-right: 36px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%237d8fa8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  cursor: pointer;
}
.form-input.small { width: 70px; flex-shrink: 0; }

/* ── Toggle group ────────────────────────────────────────── */
.toggle-group {
  display: flex;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.toggle-btn {
  flex: 1;
  padding: 10px 8px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.88rem;
  font-family: inherit;
  font-weight: 500;
  transition: background var(--t), color var(--t);
  outline: none;
}
.toggle-btn:not(:last-child) { border-right: 1px solid var(--border-strong); }
.toggle-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
}
.toggle-btn:hover:not(.active) { background: var(--surface-hover); }

/* ── EPSG chip ───────────────────────────────────────────── */
.epsg-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(14,165,233,0.07);
  border: 1px solid rgba(14,165,233,0.18);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}
.epsg-label { color: var(--text-muted); font-weight: 500; }
.epsg-value { color: var(--accent-2); font-weight: 600; font-family: monospace; }

/* ── Format cards ────────────────────────────────────────── */
.format-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.format-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 20px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--t), background var(--t);
  text-align: center;
}
.format-card input[type="radio"] { display: none; }
.format-card:hover { border-color: var(--accent); background: var(--accent-dim); }
.format-card.active {
  border-color: var(--accent);
  background: rgba(0,212,170,0.07);
}
.format-icon { font-size: 1.8rem; }
.format-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}
.format-desc { font-size: 0.78rem; color: var(--text-muted); }

/* ── Advanced panel ──────────────────────────────────────── */
.advanced-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-top: 20px;
  overflow: hidden;
}
.advanced-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  list-style: none;
  user-select: none;
  transition: background var(--t), color var(--t);
}
.advanced-toggle::-webkit-details-marker { display: none; }
.advanced-toggle:hover { background: var(--surface-hover); color: var(--text); }
.advanced-panel[open] .advanced-toggle { color: var(--text); border-bottom: 1px solid var(--border); }
.chevron {
  width: 16px; height: 16px;
  transition: transform var(--t);
}
.advanced-panel[open] .chevron { transform: rotate(180deg); }
.advanced-content { padding: 20px 18px; display: flex; flex-direction: column; gap: 16px; }

.slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.form-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border-strong);
  outline: none;
  cursor: pointer;
}
.form-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  cursor: pointer;
  transition: box-shadow var(--t);
}
.form-slider::-webkit-slider-thumb:hover { box-shadow: 0 0 16px var(--accent-glow); }
.unit-label { font-size: 0.82rem; color: var(--text-muted); width: 16px; }

/* ── Checkboxes ──────────────────────────────────────────── */
.checkboxes { display: flex; flex-direction: column; gap: 12px; }
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--t);
}
.checkbox-label:hover { color: var(--text); }
.form-checkbox { display: none; }
.checkbox-custom {
  width: 20px; height: 20px;
  border: 2px solid var(--border-strong);
  border-radius: 5px;
  flex-shrink: 0;
  transition: background var(--t), border-color var(--t);
  display: flex; align-items: center; justify-content: center;
}
.form-checkbox:checked + .checkbox-custom {
  background: var(--accent);
  border-color: var(--accent);
}
.form-checkbox:checked + .checkbox-custom::after {
  content: '';
  display: block;
  width: 5px; height: 9px;
  border: 2px solid #07091a;
  border-top: none; border-left: none;
  transform: rotate(45deg) translate(-1px, -1px);
}

/* ── Generate button ─────────────────────────────────────── */
.btn-generate {
  width: 100%;
  margin-top: 28px;
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #07091a;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: opacity var(--t), transform var(--t), box-shadow var(--t);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  letter-spacing: 0.3px;
}
.btn-generate:hover:not(:disabled) {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 8px 32px rgba(0,212,170,0.28);
}
.btn-generate:active:not(:disabled) { transform: translateY(0); }
.btn-generate:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}
.btn-idle, .btn-loading {
  display: flex; align-items: center; gap: 8px;
}
.btn-idle svg { width: 18px; height: 18px; }

/* ── Spinner ─────────────────────────────────────────────── */
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid rgba(7,9,26,0.3);
  border-top-color: #07091a;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Status message ──────────────────────────────────────── */
.status-msg {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.5;
  animation: slideDown 0.25s ease;
}
.status-msg.error {
  background: rgba(240,85,106,0.1);
  border: 1px solid rgba(240,85,106,0.25);
  color: #f0878f;
}
.status-msg.success {
  background: rgba(16,212,138,0.1);
  border: 1px solid rgba(16,212,138,0.25);
  color: var(--success);
}

/* ── Map section ─────────────────────────────────────────── */
.map-section { padding: 28px; }
.map-container {
  height: 420px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  margin-top: 4px;
}
.map-hint {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 10px;
  text-align: center;
}

/* Leaflet dark overrides */
.leaflet-container { background: #0d1124 !important; }
.leaflet-popup-content-wrapper {
  background: var(--bg-2) !important;
  color: var(--text) !important;
  border: 1px solid var(--border-strong) !important;
  border-radius: var(--radius-sm) !important;
}
.leaflet-popup-tip { background: var(--bg-2) !important; }
.leaflet-control-zoom a {
  background: var(--bg-2) !important;
  color: var(--text) !important;
  border-color: var(--border-strong) !important;
}
.leaflet-control-attribution {
  background: rgba(7,9,26,0.7) !important;
  color: var(--text-faint) !important;
}
.leaflet-control-attribution a { color: var(--text-muted) !important; }

/* ── Download section ────────────────────────────────────── */
.download-section { padding: 28px; }
.download-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  background: rgba(0,212,170,0.05);
  border: 1px solid rgba(0,212,170,0.18);
  border-radius: var(--radius);
  margin-bottom: 16px;
}
@media (max-width: 480px) {
  .download-card { flex-direction: column; text-align: center; }
}
.download-file-icon svg { width: 56px; height: 64px; color: var(--text-muted); }
.download-info { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.dl-filename {
  font-size: 1rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dl-meta { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.dl-meta-item { font-size: 0.8rem; color: var(--text-muted); }
.dl-sep { color: var(--text-faint); }
.dl-expiry { color: var(--warning); }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #07091a !important;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
  transition: opacity var(--t), transform var(--t), box-shadow var(--t);
}
.btn-download svg { width: 16px; height: 16px; }
.btn-download:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(0,212,170,0.3);
}

.btn-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 20px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--t), color var(--t), background var(--t);
}
.btn-secondary svg { width: 15px; height: 15px; }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

/* ── How to use ──────────────────────────────────────────── */
.how-section { scroll-margin-top: 80px; }
.how-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.3px;
}
.how-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 24px;
  counter-reset: steps;
}
.how-steps li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.how-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid rgba(0,212,170,0.3);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}
.how-steps li strong { display: block; font-size: 0.95rem; margin-bottom: 3px; }
.how-steps li p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

.notes-box {
  background: rgba(14,165,233,0.06);
  border: 1px solid rgba(14,165,233,0.15);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}
.notes-box h3 { font-size: 0.9rem; font-weight: 600; margin-bottom: 10px; }
.notes-box ul { padding-left: 18px; display: flex; flex-direction: column; gap: 7px; }
.notes-box li { font-size: 0.83rem; color: var(--text-muted); line-height: 1.5; }

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 20px 24px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-faint);
}

/* ── Utilities ───────────────────────────────────────────── */
.hidden { display: none !important; }
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.fade-in { animation: fadeIn var(--t-slow) ease; }