/* ================================
   Solar Planner - Styles
   ================================ */

/* ================================
   CSS Custom Properties
   ================================ */

:root {
  /* Color palette - warm solar theme */
  --sun-gold: #F5A623;
  --sun-orange: #E85D04;
  --sky-blue: #0096C7;
  --night-dark: #0D1321;
  --night-mid: #1D2D44;
  
  /* Semantic colors */
  --bg-primary: #0A0E14;
  --bg-secondary: #111922;
  --bg-card: #151D27;
  
  --text-primary: #F0F4F8;
  --text-secondary: #8DA4BE;
  --text-muted: #5B7087;
  
  --border-color: rgba(141, 164, 190, 0.15);
  --border-focus: var(--sun-gold);
  
  --accent: var(--sun-gold);
  --accent-hover: var(--sun-orange);
  
  --error: #EF4444;
  --success: #10B981;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  /* Shadows */
  --shadow-glow: 0 0 30px rgba(245, 166, 35, 0.15);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-card-hover: 0 4px 16px rgba(0, 0, 0, 0.25), 0 8px 24px rgba(245, 166, 35, 0.1);
  --shadow-input: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-input-focus: 0 0 0 3px rgba(245, 166, 35, 0.15), 0 1px 2px rgba(0, 0, 0, 0.1);
  
  /* Nav bar backgrounds - liquid glass effect */
  --nav-bg-base: rgba(21, 29, 39, 0.3);
  --nav-bg-hover: rgba(21, 29, 39, 0.4);
  --nav-bg-scrolled: rgba(21, 29, 39, 0.45);
  --nav-bg-scrolled-hover: rgba(21, 29, 39, 0.55);
  --nav-blur: blur(30px);
  
  /* Transitions */
  --transition-base: 0.2s ease;
  --transition-nav: 0.3s ease;
}

/* ================================
   Light Theme Variables
   ================================ */

[data-theme="light"] {
  --bg-primary: #FFFBF5;
  --bg-secondary: #FFF7ED;
  --bg-card: #FFFFFF;

  --text-primary: #1C1917;
  --text-secondary: #57534E;
  --text-muted: #A8A29E;

  --border-color: rgba(120, 113, 108, 0.15);
  --border-focus: #D97706;

  --accent: #D97706;
  --accent-hover: #B45309;

  --error: #DC2626;
  --success: #059669;

  /* Warm accent colors for light theme */
  --sun-gold-light: #FBBF24;
  --sun-orange-light: #F59E0B;
  --bg-warm: #FEF3E2;
  --bg-chart: #F8F9FA;

  /* Shadows - warm-tinted for light theme */
  --shadow-glow: 0 0 40px rgba(251, 191, 36, 0.25);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(120, 113, 108, 0.08);
  --shadow-card-hover: 0 4px 16px rgba(120, 113, 108, 0.12), 0 8px 24px rgba(251, 191, 36, 0.1);
  --shadow-input: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-input-focus: 0 0 0 3px rgba(251, 191, 36, 0.2), 0 1px 2px rgba(0, 0, 0, 0.04);
  
  /* Nav bar backgrounds - light theme liquid glass */
  --nav-bg-base: rgba(48, 48, 48, 0.15);
  --nav-bg-hover: rgba(48, 48, 48, 0.25);
  --nav-bg-scrolled: rgba(255, 255, 255, 0.4);
  --nav-bg-scrolled-hover: rgba(255, 255, 255, 0.5);
  --nav-blur: blur(20px);
}

/* ================================
   Reset & Base Styles
   ================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.background-pattern {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(245, 166, 35, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 150, 199, 0.08), transparent),
    linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hidden {
  display: none !important;
}

.login-page,
.main-app {
  min-height: 100vh;
}

/* ================================
   Layout
   ================================ */

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
}

/* ================================
   Navigation
   ================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1400px;
  width: 97%;
  margin: var(--space-md) auto 0;
  padding: var(--space-sm) var(--space-xl);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-md);
  min-height: 3.75rem;
  background: var(--nav-bg-base);
  backdrop-filter: var(--nav-blur);
  -webkit-backdrop-filter: var(--nav-blur);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: background var(--transition-nav), box-shadow var(--transition-nav), border-color var(--transition-nav);
  overflow: hidden;
}

.nav-container:hover {
  background: var(--nav-bg-hover);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.nav-container.scrolled {
  background: var(--nav-bg-scrolled);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.nav-container.scrolled:hover {
  background: var(--nav-bg-scrolled-hover);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.nav-title {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--sun-gold), var(--sun-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  text-align: center;
  margin: 0;
  padding: 0;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: center;
}

.nav-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-shrink: 0;
  justify-self: end;
}

.nav-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  position: relative;
  transition: transform var(--transition-nav);
}

.nav-logo::before {
  content: '';
  position: absolute;
  inset: -5px;
  background: linear-gradient(135deg, var(--sun-gold), var(--sun-orange));
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition-nav);
  z-index: -1;
}

.nav-logo-img {
  height: 3.125rem;
  width: auto;
  vertical-align: middle;
  transition: transform var(--transition-nav), filter var(--transition-nav);
  filter: drop-shadow(0 var(--space-xs) var(--space-sm) rgba(0, 0, 0, 0.6));
}

.nav-logo:hover .nav-logo-img {
  transform: scale(1.05);
  filter: drop-shadow(0 4px 8px var(--sun-gold));
}

/* Shared button styles */
:is(.nav-btn, .theme-toggle-btn) {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--text-secondary);
}

:is(.nav-btn, .theme-toggle-btn):hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
  border-color: var(--border-focus);
  transform: scale(1.05);
}

:is(.nav-btn, .theme-toggle-btn):active {
  transform: scale(0.95);
}

.menu-btn {
  flex-direction: column;
  gap: var(--space-xs);
}

.menu-btn:hover {
  opacity: 1;
}

.menu-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--space-xs);
  transition: transform var(--transition-nav), opacity var(--transition-nav);
}

.menu-btn.active .menu-line:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.menu-btn.active .menu-line:nth-child(2) {
  opacity: 0;
}

.menu-btn.active .menu-line:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.nav-actions .theme-toggle-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  transition: transform var(--transition-nav);
}

.theme-toggle-btn .moon-icon {
  display: none;
}

.theme-toggle-btn .sun-icon {
  display: block;
}

.theme-toggle-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  transition: transform var(--transition-nav);
}

/* ================================
   Header
   ================================ */

.header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  margin-top: calc(3.75rem + var(--space-md));
}

.tagline {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ================================
   Forms & Inputs
   ================================ */

.search-section {
  margin-bottom: var(--space-2xl);
}

.search-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 600px;
  margin: 0 auto;
}

.input-wrapper {
  position: relative;
  flex: 1;
}

:is(#location-input, #password-input) {
  width: 100%;
  padding: var(--space-md) var(--space-md) var(--space-md) calc(var(--space-md) * 2 + 1.25rem);
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

:is(#location-input, #password-input)::placeholder {
  color: var(--text-muted);
}

:is(#location-input, #password-input):focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input-focus);
}

.location-icon,
.lock-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 1.25rem;
  height: 1.25rem;
  color: var(--text-muted);
  pointer-events: none;
}

.submit-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--night-dark);
  background: linear-gradient(135deg, var(--sun-gold), var(--sun-orange));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.submit-btn:hover .arrow-icon {
  transform: translateX(3px);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.arrow-icon {
  width: 1.125rem;
  height: 1.125rem;
  transition: transform var(--transition-base);
}

/* Autocomplete */
.autocomplete-dropdown {
  position: absolute;
  top: calc(100% + var(--space-xs));
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-height: 300px;
  overflow-y: auto;
  z-index: 1000;
  box-shadow: var(--shadow-card);
}

.autocomplete-dropdown.hidden {
  display: none;
}

.autocomplete-header {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.autocomplete-item {
  display: flex;
  align-items: center;
  padding: var(--space-md);
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.15s ease;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.autocomplete-item:last-child {
  border-bottom: none;
}

.autocomplete-icon {
  width: 1rem;
  height: 1rem;
  margin-right: var(--space-sm);
  flex-shrink: 0;
  opacity: 0.6;
}

.autocomplete-item:hover,
.autocomplete-item.selected {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.autocomplete-item:active {
  background: rgba(245, 166, 35, 0.1);
}

/* Power Calculator Inputs */
.power-calc-inputs {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.power-calc-inputs .input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  min-width: 180px;
  flex: 1;
  max-width: 280px;
}

.power-calc-inputs label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.input-with-suffix {
  display: flex;
  align-items: stretch;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.input-with-suffix:focus-within {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input-focus);
}

.input-with-suffix input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-primary);
  min-width: 0;
}

.input-with-suffix input:focus {
  outline: none;
}

.input-with-suffix input::placeholder {
  color: var(--text-muted);
}

.input-suffix {
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  border-left: 1px solid var(--border-color);
}

.power-calc-inputs select {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.power-calc-inputs select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input-focus);
}

.power-calc-inputs select option {
  background: var(--bg-card);
  color: var(--text-primary);
}

/* ================================
   Loading & Error States
   ================================ */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-2xl);
  color: var(--text-secondary);
}

.spinner {
  width: 3rem;
  height: 3rem;
  border: 3px solid var(--border-color);
  border-top-color: var(--sun-gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-message {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  color: var(--error);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.error-message svg {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
}

.login-error-spacing {
  margin-top: var(--space-md);
}

/* ================================
   Results & Location Info
   ================================ */

.results {
  animation: fadeIn 0.4s ease;
}

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

.location-info {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-color);
}

.location-info > div {
  flex: 1;
  text-align: center;
}

.location-info h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.location-info p {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.years-info {
  font-family: var(--font-sans) !important;
  font-size: 0.875rem !important;
  color: var(--text-secondary) !important;
  margin-top: var(--space-sm) !important;
}

.location-info .cache-info {
  font-family: var(--font-sans) !important;
  font-size: 0.75rem !important;
  color: var(--text-muted) !important;
  margin-top: var(--space-xs) !important;
  text-align: center !important;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.location-info .cache-info.cached {
  color: var(--success) !important;
}

.clear-cache-link {
  display: none;
  font-family: var(--font-sans) !important;
  font-size: 0.75rem !important;
  color: var(--text-secondary);
  background: none;
  border: none;
  padding: 0;
  margin: 0 0 0 var(--space-xs);
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: var(--text-muted);
  text-underline-offset: var(--space-xs);
  transition: color var(--transition-base), text-decoration-color var(--transition-base);
  font-weight: 400;
}

.clear-cache-link.show {
  display: inline;
}

.clear-cache-link:hover {
  color: var(--text-primary);
  text-decoration-color: var(--text-primary);
}

.clear-cache-link:active {
  opacity: 0.7;
}

.clear-cache-link:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.cache-info {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: var(--space-sm);
}

/* ================================
   Data Sections
   ================================ */

.data-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-lg);
  gap: var(--space-md);
}

.section-header h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.section-header h3 svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--sun-gold);
}

.section-description {
  margin-top: var(--space-xs);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.section-header-actions {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  flex-wrap: wrap;
}

.view-toggle {
  display: flex;
  gap: var(--space-xs);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-xs);
  flex-shrink: 0;
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.toggle-btn svg {
  width: 1rem;
  height: 1rem;
}

.toggle-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.toggle-btn.active {
  color: var(--night-dark);
  background: linear-gradient(135deg, var(--sun-gold), var(--sun-orange));
  box-shadow: var(--shadow-card);
}

.toggle-btn.active:hover {
  background: linear-gradient(135deg, var(--sun-orange), #DC2F02);
}

.view-content.hidden {
  display: none !important;
}

/* ================================
   Tables
   ================================ */

.table-container {
  overflow-x: auto;
  margin-bottom: var(--space-xl);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  white-space: nowrap;
}

.data-table th,
.data-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: center;
  border: 1px solid var(--border-color);
}

.data-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table td {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
}

.data-table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.data-table tbody tr:hover {
  background: rgba(245, 166, 35, 0.05);
}

.data-table td:first-child {
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--text-secondary);
}

.solar-table th[colspan] {
  background: linear-gradient(135deg, var(--bg-secondary), var(--night-mid));
}

/* ================================
   Charts
   ================================ */

.chart-container {
  position: relative;
  height: 300px;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.chart-container canvas.hidden {
  display: none !important;
}

#hourly-power-container {
  padding-bottom: calc(var(--space-md) + var(--space-xl));
}

.chart-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.chart-label.hidden {
  display: none;
}

.chart-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 200px;
  color: var(--text-muted);
  font-size: 0.9375rem;
  text-align: center;
  padding: var(--space-lg);
}

.hourly-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-color);
}

.hourly-header h4 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.back-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--accent);
  color: var(--accent);
}

.back-btn svg {
  width: 1rem;
  height: 1rem;
}

#power-gen-chart {
  cursor: pointer;
}

/* ================================
   Footer
   ================================ */

.footer {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  margin-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer a {
  color: var(--sky-blue);
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer a:hover {
  color: var(--sun-gold);
  text-decoration: underline;
}

/* ================================
   Login Page
   ================================ */

.login-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  max-width: 400px;
  margin: 0 auto;
  padding: var(--space-xl);
  margin-top: calc(3.75rem + var(--space-md) + var(--space-2xl) * 2);
}

.login-container .logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.login-container .logo .logo-image {
  height: 4rem;
}

.login-container .logo h1 {
  font-size: 2rem;
}

.login-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.login-form .input-wrapper {
  position: relative;
}

/* ================================
   Light Theme Overrides
   ================================ */

[data-theme="light"] .background-pattern {
  background:
    radial-gradient(ellipse 100% 60% at 50% -30%, rgba(251, 191, 36, 0.12), transparent 70%),
    radial-gradient(ellipse 80% 50% at 100% 20%, rgba(245, 158, 11, 0.08), transparent 60%),
    radial-gradient(ellipse 60% 40% at 0% 80%, rgba(6, 182, 212, 0.04), transparent 50%),
    linear-gradient(175deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-card) 100%);
}

[data-theme="light"] .data-section {
  box-shadow: var(--shadow-card);
  border-color: var(--border-color);
}

[data-theme="light"] .data-section:hover {
  box-shadow: var(--shadow-card-hover);
}

[data-theme="light"] :is(#location-input, #password-input) {
  background: var(--bg-card);
  border-color: var(--border-color);
  box-shadow: var(--shadow-input);
}

[data-theme="light"] :is(#location-input, #password-input):focus {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-input-focus);
}

[data-theme="light"] :is(#location-input, #password-input)::placeholder {
  color: var(--text-muted);
}

[data-theme="light"] .submit-btn {
  background: linear-gradient(135deg, var(--sun-gold-light) 0%, var(--sun-orange-light) 50%, var(--accent) 100%);
  color: var(--text-primary);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .submit-btn:hover {
  background: linear-gradient(135deg, #FCD34D 0%, var(--sun-gold-light) 50%, var(--sun-orange-light) 100%);
  box-shadow: var(--shadow-card-hover);
}

[data-theme="light"] .view-toggle {
  background: var(--bg-warm);
  border-color: var(--border-color);
}

[data-theme="light"] .autocomplete-dropdown {
  background: var(--bg-card);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-color);
}

[data-theme="light"] .autocomplete-header {
  background: var(--bg-warm);
  color: var(--text-secondary);
}

[data-theme="light"] .autocomplete-item:hover,
[data-theme="light"] .autocomplete-item.selected {
  background: var(--bg-warm);
}

[data-theme="light"] .autocomplete-item:active {
  background: rgba(251, 191, 36, 0.15);
}

[data-theme="light"] .data-table th {
  background: linear-gradient(180deg, var(--bg-warm) 0%, rgba(253, 230, 138, 0.125) 100%);
  color: var(--text-secondary);
  border-color: var(--border-color);
}

[data-theme="light"] .data-table td {
  border-color: var(--border-color);
}

[data-theme="light"] .data-table tbody tr:nth-child(even) {
  background: rgba(254, 243, 226, 0.5);
}

[data-theme="light"] .data-table tbody tr:hover {
  background: rgba(251, 191, 36, 0.1);
}

[data-theme="light"] .solar-table th[colspan] {
  background: linear-gradient(135deg, var(--bg-warm) 0%, rgba(253, 230, 138, 0.25) 100%);
}

[data-theme="light"] .toggle-btn {
  color: var(--text-secondary);
}

[data-theme="light"] .toggle-btn:hover {
  background: rgba(251, 191, 36, 0.1);
  color: var(--text-primary);
}

[data-theme="light"] .toggle-btn.active {
  background: linear-gradient(135deg, var(--sun-gold-light) 0%, var(--sun-orange-light) 100%);
  color: var(--text-primary);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] .toggle-btn.active:hover {
  background: linear-gradient(135deg, #FCD34D 0%, var(--sun-gold-light) 100%);
}

[data-theme="light"] .chart-container {
  background: var(--bg-chart);
  border: 1px solid var(--border-color);
}

[data-theme="light"] .chart-label {
  border-left-color: var(--accent);
}

[data-theme="light"] :is(.nav-btn, .theme-toggle-btn) {
  background: var(--bg-card);
  border-color: var(--border-color);
  box-shadow: var(--shadow-card);
}

[data-theme="light"] :is(.nav-btn, .theme-toggle-btn):hover {
  background: var(--bg-warm);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-card-hover);
}

[data-theme="light"] .menu-line {
  background: var(--text-primary);
}

[data-theme="light"] .nav-container {
  background: var(--nav-bg-base);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

[data-theme="light"] .nav-container:hover {
  background: var(--nav-bg-hover);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

[data-theme="light"] .nav-container.scrolled {
  background: var(--nav-bg-scrolled);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

[data-theme="light"] .nav-container.scrolled:hover {
  background: var(--nav-bg-scrolled-hover);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

[data-theme="light"] .theme-toggle-btn .moon-icon {
  display: block;
}

[data-theme="light"] .theme-toggle-btn .sun-icon {
  display: none;
}

[data-theme="light"] .error-message {
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.2);
}

[data-theme="light"] .clear-cache-link {
  color: var(--text-secondary);
  text-decoration-color: var(--text-muted);
}

[data-theme="light"] .clear-cache-link:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

[data-theme="light"] .location-info {
  border-color: var(--border-color);
}

[data-theme="light"] .spinner {
  border-color: var(--border-color);
  border-top-color: var(--sun-orange-light);
}

[data-theme="light"] .footer {
  border-color: var(--border-color);
}

[data-theme="light"] .footer a {
  color: var(--sky-blue);
}

[data-theme="light"] .footer a:hover {
  color: var(--accent);
}

/* ================================
   Responsive Design
   ================================ */

@media (min-width: 640px) {
  .search-form {
    flex-direction: row;
  }
  
  .submit-btn {
    flex-shrink: 0;
  }
}

@media (min-width: 768px) {
  .container {
    padding: var(--space-2xl) var(--space-xl);
  }
  
  .tagline {
    font-size: 1.125rem;
  }
  
  .chart-container {
    height: 350px;
  }
  
  #hourly-power-container {
    padding-bottom: calc(var(--space-md) + var(--space-2xl));
  }
}

@media (max-width: 640px) {
  .location-info {
    flex-direction: column;
    align-items: stretch;
  }
  
  .location-info > div {
    text-align: center;
  }
  
  .section-header {
    flex-direction: column;
    align-items: stretch;
  }
  
  .view-toggle {
    align-self: flex-end;
  }
  
  .toggle-btn {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
  }
  
  .toggle-btn span {
    display: none;
  }
  
  .toggle-btn svg {
    width: 1.125rem;
    height: 1.125rem;
  }
  
  .data-table {
    font-size: 0.75rem;
  }
  
  .data-table th,
  .data-table td {
    padding: var(--space-xs) var(--space-sm);
  }
  
  .section-header h3 {
    font-size: 1.125rem;
  }
  
  .data-section {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  .login-container {
    padding: var(--space-md);
  }

  .power-calc-inputs {
    flex-direction: column;
    gap: var(--space-md);
  }

  .power-calc-inputs .input-group {
    max-width: none;
  }

  .hourly-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

@media (max-width: 768px) {
  .nav-container {
    width: 95%;
    padding: var(--space-xs) var(--space-md);
    margin-top: var(--space-sm);
    grid-template-columns: auto 1fr auto;
    gap: var(--space-sm);
  }
  
  .nav-logo-img {
    height: 2.5rem;
  }
  
  .nav-title {
    font-size: 1.5rem;
  }
  
  .nav-btn {
    width: 2.5rem;
    height: 2.5rem;
  }
  
  .nav-btn svg {
    width: 1.125rem;
    height: 1.125rem;
  }
  
  .menu-line {
    width: 1.25rem;
  }
}