:root {
  --bg: #0f1720;
  --panel: #17212b;
  --border: #2a3644;
  --text: #e5edf5;
  --muted: #93a3b3;
  --accent: #3fa9f5;
  --active: #7cb342;
}

:root[data-theme="light"] {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --border: #d7dee5;
  --text: #1a2430;
  --muted: #5b6b7a;
  --accent: #1d7fd1;
  --active: #5a8f2e;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) {
    --bg: #f4f6f8;
    --panel: #ffffff;
    --border: #d7dee5;
    --text: #1a2430;
    --muted: #5b6b7a;
    --accent: #1d7fd1;
    --active: #5a8f2e;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.app-footer {
  margin-top: auto;
  text-align: center;
  padding: 0.6rem;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}
.app-footer a { color: var(--accent); text-decoration: none; }
.app-footer a:hover { text-decoration: underline; }

header {
  background: var(--bg);
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex-shrink: 0;
}

.user-menu { position: relative; display: flex; align-items: center; gap: 0.75rem; }
.clock { font-family: 'Courier New', monospace; color: var(--muted); font-size: 0.85rem; white-space: nowrap; }

.avatar-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #05202f;
  border: none;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  flex-shrink: 0;
}

.user-menu-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  width: 240px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  padding: 1rem;
  z-index: 50;
}

.user-menu-name { font-weight: 700; font-size: 1rem; color: var(--text); margin-bottom: 0.5rem; }

.role-badge {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.user-menu-panel hr { border: none; border-top: 1px solid var(--border); margin: 0.75rem 0; }

.user-menu-item {
  display: block;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.3rem 0;
}
.user-menu-item.logout { color: #e57373; }

.user-menu-theme { display: flex; align-items: center; justify-content: space-between; font-size: 0.85rem; color: var(--muted); }
.theme-toggle { display: flex; gap: 0.35rem; }
.theme-toggle button {
  width: 30px;
  height: 26px;
  padding: 0;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.theme-toggle button svg { width: 15px; height: 15px; }
.theme-toggle button.active { background: var(--accent); color: #05202f; border-color: var(--accent); }

h1 { font-size: 1.25rem; margin: 0; }

.project-bar { display: flex; gap: 0.5rem; }

.app-body { display: flex; align-items: stretch; flex: 1; min-height: 0; }

.sidebar {
  width: 250px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  overflow-x: hidden;
  overflow-y: auto;
  transition: width 0.2s ease;
}

.sidebar.collapsed {
  width: 0;
  border-right: none;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.25rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.sidebar-item.active {
  background: var(--active);
  color: #12210a;
  font-weight: 600;
}

.sidebar-item.disabled {
  color: var(--muted);
  cursor: not-allowed;
}

.sidebar-icon { width: 22px; height: 22px; flex-shrink: 0; }

.sidebar-item .caret { margin-left: auto; font-size: 0.7rem; opacity: 0.6; }

.sidebar-toggle {
  display: flex;
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem;
  border-radius: 6px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.sidebar-toggle svg { width: 22px; height: 22px; }

.sidebar-backdrop {
  display: none;
}

@media (max-width: 768px) {
  header { position: relative; z-index: 110; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    max-width: 80vw;
    background: var(--bg);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 100;
    overflow-y: auto;
  }
  .sidebar.open { transform: translateX(0); }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }
  .sidebar-backdrop.open { opacity: 1; pointer-events: auto; }
}

main {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  max-width: 960px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
}

main, .sidebar {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
main::-webkit-scrollbar, .sidebar::-webkit-scrollbar { width: 10px; }
main::-webkit-scrollbar-track, .sidebar::-webkit-scrollbar-track { background: transparent; }
main::-webkit-scrollbar-thumb, .sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 6px;
}
main::-webkit-scrollbar-thumb:hover, .sidebar::-webkit-scrollbar-thumb:hover { background: var(--muted); }

.fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.fieldset-summary {
  cursor: pointer;
  padding: 0.85rem 1rem;
  color: var(--accent);
  font-weight: 600;
  display: flex;
  align-items: center;
  user-select: none;
}
.fieldset-summary::before {
  content: '\25B8';
  display: inline-block;
  margin-right: 0.6rem;
  color: var(--muted);
  transition: transform 0.2s ease;
}
.fieldset.open .fieldset-summary::before { transform: rotate(90deg); }
.fieldset-summary select { margin-left: 0.75rem; font-weight: 400; }

.fieldset-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}
.fieldset.open .fieldset-body { grid-template-rows: 1fr; }
.fieldset-body-inner { overflow: hidden; min-height: 0; }

.fieldset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem;
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--muted);
  gap: 0.25rem;
}

input, select {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.4rem 0.5rem;
  font-size: 0.9rem;
}

input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

button {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  color: #05202f;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
}

button:hover { opacity: 0.9; }

.btn-link {
  display: inline-block;
  background: var(--accent);
  border-radius: 6px;
  color: #05202f;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  text-decoration: none;
}
.btn-link:hover { opacity: 0.9; }

table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; }
th, td { text-align: left; padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; }

/* Heat Load app */
.hl-topbar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 1rem; }
.hl-title { margin: 0; letter-spacing: 0.08em; font-size: 1.1rem; }
.hl-ambient { display: flex; flex-direction: row; align-items: center; gap: 0.5rem; color: var(--muted); font-size: 0.9rem; }
.hl-ambient input { width: 80px; }

.hl-room-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; align-items: center; }
.hl-room-tab {
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px 6px 0 0;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.hl-room-tab.active { background: var(--active); color: #12210a; font-weight: 600; }
.hl-room-tab .remove-tab { opacity: 0.6; font-weight: 700; }
.hl-room-tab .remove-tab:hover { opacity: 1; }
.hl-add-room {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--muted);
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  font-weight: 400;
}

.hl-summary-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-end;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}
.hl-summary-bar .field { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.8rem; color: var(--muted); }
.hl-summary-bar .field input, .hl-summary-bar .field select { width: 90px; }
.hl-summary-bar .total { margin-left: auto; font-size: 1.15rem; color: var(--active); font-weight: 700; }
.hl-geometry-readout { font-size: 0.8rem; color: var(--muted); }

.fieldset-summary .cat-watts { margin-left: auto; color: var(--active); font-weight: 700; font-size: 0.85rem; }

.hl-method-toggle { display: flex; gap: 1.5rem; padding: 0.85rem 1rem; border-bottom: 1px solid var(--border); font-size: 0.9rem; align-items: center; }
.hl-method-toggle label { flex-direction: row; align-items: center; gap: 0.4rem; color: var(--text); }

.hl-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: flex-end;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
}
.hl-row:last-of-type { border-bottom: none; }
.hl-row label { font-size: 0.75rem; min-width: 100px; }
.hl-row input, .hl-row select { width: 100px; }
.hl-row .row-watts { margin-left: auto; color: var(--muted); font-size: 0.85rem; min-width: 70px; text-align: right; }
.hl-row .remove-row {
  background: transparent;
  color: #e57373;
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 400;
}

.hl-add-btn {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--accent);
  padding: 0.5rem 1rem;
  margin: 0.5rem 1rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 400;
}

.hl-actions { display: flex; gap: 0.75rem; margin-top: 0.5rem; }

@media print {
  body * { visibility: hidden; }
  #printReport, #printReport * { visibility: visible; }
  #printReport {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background: #fff;
    color: #000;
    padding: 1rem;
  }
  #printReport h2, #printReport h3 { color: #000; }
  #printReport table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; }
  #printReport th, #printReport td { border: 1px solid #ccc; padding: 0.3rem 0.5rem; text-align: left; }
}