/* ==========================================================================
   Urban Carbon Atlas — style.css
   All values from DESIGN.md. No ad-hoc colour/font decisions.
   ========================================================================== */

/* --- Custom properties (DESIGN.md Section 2 + 4.2) ---------------------- */
/* --- Dark theme (default) ------------------------------------------------ */
:root, [data-theme="dark"] {
  --color-bg:             #0a0a0f;
  --color-text:           #e8e8ef;
  --color-text-secondary: #8888a0;
  --color-accent:         #00e5a0;
  --color-panel-bg:       #12121a;
  --color-panel-border:   #2a2a3a;
  --color-nav-bg:         #0a0a0f;
  --color-nav-text:       #e8e8ef;
  --color-banner-bg:      #1a2a1a;
  --color-banner-text:    #00e5a0;
  --color-btn:            #1e1e2e;
  --color-btn-hover:      #00e5a0;
  --color-null:           #2a2a3a;
}

/* --- Light theme --------------------------------------------------------- */
[data-theme="light"] {
  --color-bg:             #f9f9f7;
  --color-text:           #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-accent:         #c0392b;
  --color-panel-bg:       #ffffff;
  --color-panel-border:   #e8e8e6;
  --color-nav-bg:         #1a1a1a;
  --color-nav-text:       #f9f9f7;
  --color-banner-bg:      #fff3cd;
  --color-banner-text:    #856404;
  --color-btn:            #1a1a1a;
  --color-btn-hover:      #c0392b;
  --color-null:           #e0e0e0;
}

/* --- Shared tokens (both themes) ---------------------------------------- */
:root {
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 32px;
  --space-xl: 64px;
  --nav-height: 56px;
}

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

/* --- Base typography (DESIGN.md Section 3) ------------------------------- */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-sm);
}

p, li {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.caption {
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text-secondary);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-text-secondary);
}

.map-label {
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.4;
}

/* --- Navigation bar (DESIGN.md Section 4.1) ------------------------------ */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-panel-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  z-index: 1000;
}

nav .site-name {
  color: var(--color-nav-text);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
}

nav .nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

nav .nav-links a {
  color: var(--color-nav-text);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
}

nav .nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* --- Layout -------------------------------------------------------------- */
.content {
  max-width: 720px;
  margin: 0 auto;
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-xl);
}

.full-width {
  width: 100%;
  padding-top: var(--nav-height);
}

#map {
  width: 100%;
  height: calc(100vh - var(--nav-height));
}

/* --- Stat cards ---------------------------------------------------------- */
.stat-cards {
  display: flex;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.stat-card {
  flex: 1;
  background: var(--color-panel-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 8px;
  padding: var(--space-md);
  text-align: center;
}

/* --- Data table ---------------------------------------------------------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
}

th, td {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-panel-border);
}

th {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* --- Side panel (DESIGN.md Section 6.4) ---------------------------------- */
.panel {
  position: fixed;
  top: var(--nav-height);
  right: 0;
  width: 360px;
  height: calc(100vh - var(--nav-height));
  background: var(--color-panel-bg);
  border-left: 1px solid var(--color-panel-border);
  overflow-y: auto;
  padding: var(--space-lg);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 900;
}

.panel.open {
  transform: translateX(0);
}

.panel-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--color-btn);
  color: var(--color-nav-text);
  border: none;
  border-radius: 4px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.panel-close:hover {
  background: var(--color-btn-hover);
}

/* --- Map controls -------------------------------------------------------- */

/* Layer indicator (DESIGN.md Section 6.1) */
.layer-indicator {
  position: absolute;
  top: calc(var(--space-sm) + var(--nav-height));
  left: var(--space-sm);
  background: var(--color-panel-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 8px;
  padding: var(--space-sm) 12px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  z-index: 800;
}

/* Layer toggle (DESIGN.md Section 6.2) */
.layer-toggle {
  position: absolute;
  top: calc(var(--space-sm) + var(--nav-height));
  right: var(--space-sm);
  display: flex;
  gap: 0;
  z-index: 800;
}

.layer-toggle button {
  background: var(--color-btn);
  color: var(--color-nav-text);
  border: none;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}

.layer-toggle button:first-child {
  border-radius: 4px 0 0 4px;
}

.layer-toggle button:last-child {
  border-radius: 0 4px 4px 0;
}

.layer-toggle button.active {
  background: var(--color-accent);
  color: var(--color-bg);
}

.layer-toggle button:hover:not(.active) {
  background: var(--color-panel-border);
}

/* Legend (DESIGN.md Section 6.3) */
.legend {
  position: absolute;
  bottom: var(--space-lg);
  left: var(--space-sm);
  background: var(--color-panel-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 8px;
  padding: 12px;
  z-index: 800;
  min-width: 140px;
}

.legend-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.legend-gradient {
  width: 20px;
  height: 120px;
  border-radius: 2px;
  background: linear-gradient(
    to bottom,
    #800026,
    #bd0026,
    #f03b20,
    #fd8d3c,
    #feb24c,
    #fed976,
    #ffffb2
  );
}

.legend-labels {
  position: relative;
  height: 120px;
  margin-left: var(--space-sm);
  width: 32px;
}

.legend-labels .legend-label {
  position: absolute;
  left: 0;
  transform: translateY(-50%);
  white-space: nowrap;
}

.legend-bar {
  display: flex;
  gap: var(--space-sm);
}

.legend-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.legend-unit {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

.legend-source {
  font-size: 0.625rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

/* --- Beta banner (fixed at bottom of viewport) -------------------------- */
.banner {
  background: var(--color-banner-bg);
  color: var(--color-banner-text);
  border-top: 1px solid var(--color-panel-border);
  padding: 10px var(--space-lg);
  font-size: 0.8125rem;
  line-height: 1.45;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1100;
}

.banner > span {
  flex: 1;
}

.banner strong {
  font-weight: 700;
  margin-right: 4px;
}

.banner-close {
  background: none;
  border: none;
  color: var(--color-banner-text);
  cursor: pointer;
  font-size: 1.125rem;
  padding: var(--space-xs);
  line-height: 1;
}

.banner.hidden {
  display: none;
}

/* Lift the map legend above the bottom banner when it is visible */
body:has(.banner:not(.hidden)) .legend {
  bottom: calc(var(--space-lg) + 60px);
}

@media (max-width: 640px) {
  .banner {
    padding: 8px var(--space-md);
    font-size: 0.75rem;
  }
  body:has(.banner:not(.hidden)) .legend {
    bottom: calc(var(--space-lg) + 80px);
  }
}

/* --- Footer -------------------------------------------------------------- */
footer {
  border-top: 1px solid var(--color-panel-border);
  padding: var(--space-lg);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

footer a:hover {
  color: var(--color-accent);
}

/* --- Theme toggle -------------------------------------------------------- */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-panel-border);
  color: var(--color-nav-text);
  border-radius: 4px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 0.875rem;
  font-family: inherit;
  line-height: 1;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --- Dark mode map adjustments ------------------------------------------- */
.maplibregl-ctrl-attrib {
  background: rgba(10, 10, 15, 0.7) !important;
  color: var(--color-text-secondary) !important;
}

.maplibregl-ctrl-attrib a {
  color: var(--color-text-secondary) !important;
}

/* --- Responsive (DESIGN.md Section 4.3) ---------------------------------- */

/* Tablet */
@media (max-width: 1024px) {
  .panel {
    width: 320px;
  }

  .stat-cards {
    gap: var(--space-sm);
  }
}

/* Mobile */
@media (max-width: 640px) {
  nav {
    padding: 0 var(--space-md);
  }

  nav .nav-links {
    gap: var(--space-md);
  }

  .content {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  h1 {
    font-size: 1.75rem;
  }

  .stat-cards {
    flex-direction: column;
  }

  /* Panel becomes bottom drawer */
  .panel {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 50vh;
    border-left: none;
    border-top: 1px solid var(--color-panel-border);
    border-radius: 12px 12px 0 0;
    transform: translateY(100%);
  }

  .panel.open {
    transform: translateY(0);
  }

  /* Move layer toggle to bottom-right */
  .layer-toggle {
    top: auto;
    bottom: var(--space-lg);
    right: var(--space-sm);
  }

  /* Collapse legend to compact */
  .legend {
    bottom: calc(var(--space-lg) + 40px);
  }
}