:root {
  --red:        #cc0000;
  --dark:       #1a1a1a;
  --gray:       #444;
  --light-gray: #f5f5f5;
  --border:     #ddd;
  --white:      #fff;
  --muted:      #666;
  --danger:     #c0392b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--light-gray);
  color: var(--dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  background: var(--dark);
  color: var(--white);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  height: 60px;
  border-bottom: 3px solid var(--red);
  flex-shrink: 0;
}
header .logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
  text-decoration: none;
}
header .logo span { color: var(--red); }
header nav {
  margin-left: auto;
  display: flex;
  gap: 8px;
  align-items: center;
}
header nav a {
  color: #ccc;
  text-decoration: none;
  font-size: 0.85rem;
  padding: 5px 12px;
  border: 1px solid #555;
  border-radius: 6px;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
header nav a:hover { color: var(--white); border-color: #aaa; }

/* ── Breadcrumb ── */
.breadcrumb {
  padding: 0.75rem 2rem;
  font-size: 0.875rem;
  color: var(--gray);
  border-bottom: 1px solid var(--border);
  background: #f9f9f9;
  flex-shrink: 0;
}
.breadcrumb a { color: var(--red); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ── Layout ── */
.page {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px;
}

/* ── Footer ── */
footer {
  background: var(--light-gray);
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.5rem 2rem;
  color: var(--gray);
  font-size: 0.875rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex-shrink: 0;
}
footer a { color: var(--red); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ── Cards ── */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 20px;
}
.card-title {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--gray);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
}

/* ── Upload zone ── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  color: var(--muted);
}
.drop-zone:hover, .drop-zone.dragging {
  background: #fff3f3;
  border-color: var(--red);
  color: var(--dark);
}
.drop-zone .icon { font-size: 2.5rem; margin-bottom: 12px; }
.drop-zone p { font-size: 0.95rem; }
.drop-zone small { font-size: 0.78rem; margin-top: 6px; display: block; }

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--red); color: var(--white); }
.btn-outline {
  background: transparent;
  color: var(--red);
  border: 1px solid var(--red);
}
.btn-danger { background: var(--danger); color: var(--white); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Mode selector (index) ── */
.mode-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 8px;
}
.mode-card-wide { grid-column: 1 / -1; }
.mode-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.2s, transform 0.15s;
  background: var(--white);
}
.mode-card:hover {
  border-color: var(--red);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.mode-card .icon { font-size: 2rem; margin-bottom: 8px; }
.mode-card h3 { font-size: 1rem; color: var(--dark); font-weight: 700; }
.mode-card p  { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }

/* ── Day tabs ── */
.day-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.day-tab {
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--white);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.1s, border-color 0.1s, color 0.1s;
}
.day-tab.active { background: var(--red); color: var(--white); border-color: var(--red); }

/* ── Progress / spinner ── */
.progress-bar {
  width: 100%; height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 12px;
  display: none;
}
.progress-bar.visible { display: block; }
.progress-fill {
  height: 100%;
  background: var(--red);
  border-radius: 3px;
  width: 0%;
  animation: indeterminate 1.4s infinite;
}
@keyframes indeterminate {
  0%   { width: 0%; margin-left: 0; }
  50%  { width: 60%; margin-left: 20%; }
  100% { width: 0%; margin-left: 100%; }
}

/* ── Error banner ── */
.error-msg {
  background: #fdf0ef;
  border: 1px solid #e88;
  border-radius: 6px;
  padding: 12px 16px;
  color: var(--danger);
  font-size: 0.9rem;
  margin-top: 12px;
  display: none;
}
.error-msg.visible { display: block; }

/* ── Form ── */
label { font-size: 0.875rem; font-weight: 500; display: block; margin-bottom: 4px; }
input[type=text], input[type=date], textarea, select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  margin-bottom: 14px;
  font-family: inherit;
}
input[type=text]:focus, input[type=date]:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--red);
}
textarea { resize: vertical; min-height: 80px; }

.checkbox-group { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.checkbox-group label { font-weight: 400; display: flex; align-items: center; gap: 6px; cursor: pointer; }

/* ── Graph skeleton ── */
.skeleton {
  background: linear-gradient(90deg, var(--border) 25%, #e8ecf0 50%, var(--border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 6px;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ── System selector ── */
.system-select { margin-bottom: 16px; }
.system-select select { width: auto; min-width: 220px; }

/* ── Advanced sensors panel ── */
.advanced-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--muted);
  font-family: inherit;
}
.advanced-toggle:hover { color: var(--red); border-color: var(--red); }
.advanced-body { display: none; margin-top: 10px; }
.advanced-body.open { display: block; }
.sensor-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.sensor-chip {
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  cursor: pointer;
  background: var(--white);
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.sensor-chip.active { background: var(--red); color: var(--white); border-color: var(--red); }

/* ── Day checkboxes (report page) ── */
.day-checkboxes { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.day-check-label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}
.day-check-label input { accent-color: var(--red); }

/* ── Responsive ── */
@media (max-width: 640px) {
  .mode-cards { grid-template-columns: 1fr; }
  .mode-card-wide { grid-column: 1; }
  .card { padding: 16px; }
  header { padding: 0 1rem; }
  header nav a { font-size: 0.78rem; padding: 4px 8px; }
  .breadcrumb { padding: 0.75rem 1rem; }
  .page { padding: 16px; }
}