/* ================================================================
   DC Energy — Solar Calculator Stylesheet
   Design system based on BLUEPRINT_UI.md
   Palette: #63923E (brand green), #000000 (black), #FFFFFF (white)
   Typography: Inter + Rajdhani (display)
   ================================================================ */

:root {
  color-scheme: light;

  /* Brand palette */
  --brand-green: #63923E;
  --brand-green-hover: #527a33;
  --brand-green-light: #92B56B;
  --brand-green-soft: rgba(99, 146, 62, 0.08);
  --brand-green-glow: rgba(99, 146, 62, 0.25);

  /* Neutrals */
  --black: #000000;
  --dark-grey: #4C4C4C;
  --light-grey: #bfbfbf;
  --surface: #ffffff;
  --surface-alt: #f8f9f7;
  --surface-soft: #eef3ec;
  --line: #e2e5df;

  /* Semantic */
  --ink: #111a14;
  --muted: #607066;
  --amber: #b36a1e;
  --amber-soft: #fdf4e8;
  --blue: #245e8f;
  --blue-soft: #e0edf7;
  --danger: #c23333;
  --danger-soft: #fbeaea;
  --success: #1d7a4d;
  --success-soft: #dff0e7;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(17, 26, 20, 0.06), 0 1px 2px rgba(17, 26, 20, 0.04);
  --shadow-md: 0 4px 16px rgba(17, 26, 20, 0.08), 0 2px 4px rgba(17, 26, 20, 0.04);
  --shadow-lg: 0 12px 40px rgba(17, 26, 20, 0.1), 0 4px 12px rgba(17, 26, 20, 0.05);
  --shadow-green: 0 0 20px rgba(99, 146, 62, 0.3);

  /* Radius */
  --radius: 10px;
  --radius-lg: 14px;
  --radius-full: 999px;
}

/* ----------------------------------------------------------------
   Reset & Base
   ---------------------------------------------------------------- */

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background: var(--surface-alt);
  color: var(--ink);
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

::selection {
  background: var(--brand-green-soft);
  color: var(--brand-green);
}

/* ----------------------------------------------------------------
   Header
   ---------------------------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 32px;
  background: var(--black);
  border-bottom: 3px solid var(--brand-green);
  position: sticky;
  top: 0;
  z-index: 50;
}

.app-header h1,
.app-header p {
  margin: 0;
}

.app-header h1 {
  font-family: "Rajdhani", "Inter", sans-serif;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.eyebrow {
  color: var(--brand-green-light);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ----------------------------------------------------------------
   Mode Buttons / Tabs / Ghost / Primary
   ---------------------------------------------------------------- */

.header-actions,
.tabs {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 3px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
}

/* Override tab pill colors when inside input panel (light bg) */
.input-panel .tabs {
  border-color: var(--line);
  background: var(--surface);
  backdrop-filter: none;
}

.mode-button,
.tab-button,
.ghost-button,
.primary-button {
  min-height: 38px;
  border-radius: 8px;
  border: 0;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.55);
  background: transparent;
  transition: all 0.2s ease;
}

.input-panel .tab-button {
  color: var(--dark-grey);
}

.mode-button.active,
.tab-button.active {
  background: var(--brand-green);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(99, 146, 62, 0.3);
}

.mode-button:hover:not(.active),
.tab-button:hover:not(.active) {
  background: rgba(99, 146, 62, 0.15);
  color: var(--brand-green-light);
}

.input-panel .tab-button:hover:not(.active) {
  color: var(--brand-green);
}

.ghost-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--dark-grey);
  font-weight: 600;
}

.ghost-button:hover {
  border-color: var(--brand-green);
  color: var(--brand-green);
  background: var(--brand-green-soft);
}

.primary-button {
  color: #ffffff;
  background: var(--brand-green);
  font-weight: 700;
  box-shadow: var(--shadow-green);
}

.primary-button:hover {
  background: var(--brand-green-hover);
}

/* ----------------------------------------------------------------
   Layout — Two Column
   ---------------------------------------------------------------- */

.layout {
  display: grid;
  grid-template-columns: minmax(330px, 420px) minmax(0, 1fr);
  gap: 24px;
  padding: 28px 32px 48px;
  max-width: 1480px;
  margin: 0 auto;
}

/* ----------------------------------------------------------------
   Panels & Cards
   ---------------------------------------------------------------- */

.input-panel,
.results-panel,
.detail-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.input-panel {
  padding: 24px;
  align-self: start;
}

.results-panel {
  padding: 24px;
  min-width: 0;
}

/* ----------------------------------------------------------------
   Section Headings
   ---------------------------------------------------------------- */

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.section-heading h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--black);
}

.section-heading.compact {
  margin-bottom: 14px;
}

.section-heading.compact h2 {
  font-size: 16px;
}

/* ----------------------------------------------------------------
   Field Grid & Inputs
   ---------------------------------------------------------------- */

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.field span,
.check-row span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.field input,
.field select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--ink);
  background: var(--surface-alt);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--brand-green);
  box-shadow: 0 0 0 3px var(--brand-green-glow);
  background: var(--surface);
}

.field input::placeholder {
  color: var(--light-grey);
}

/* ----------------------------------------------------------------
   Upload Zone
   ---------------------------------------------------------------- */

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin: 20px 0;
  border: 2px dashed var(--brand-green);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  background: linear-gradient(135deg, var(--brand-green-soft), rgba(99, 146, 62, 0.03));
  cursor: pointer;
  text-align: center;
  transition: all 0.25s ease;
}

.upload-zone:hover {
  border-color: var(--brand-green-hover);
  background: linear-gradient(135deg, rgba(99, 146, 62, 0.12), rgba(99, 146, 62, 0.05));
  box-shadow: 0 4px 20px rgba(99, 146, 62, 0.12);
  transform: translateY(-1px);
}

.upload-icon {
  width: 32px;
  height: 32px;
  color: var(--brand-green);
  opacity: 0.7;
}

.upload-zone input[type="file"] {
  width: 100%;
  font-size: 13px;
}

.upload-title {
  font-weight: 750;
  font-size: 14px;
  color: var(--ink);
}

.upload-formats {
  font-size: 11px;
  color: var(--muted);
  font-weight: 500;
}

/* Upload status states */
.upload-status-loading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--brand-green);
  padding: 6px 0;
}

.upload-status-success {
  font-size: 12px;
  font-weight: 600;
  color: var(--success);
  padding: 4px 0;
}

.upload-status-error {
  font-size: 12px;
  font-weight: 600;
  color: var(--danger);
  padding: 4px 0;
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--brand-green-glow);
  border-top-color: var(--brand-green);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

#billUploadStatus {
  color: var(--muted);
  font-size: 12px;
}

/* ----------------------------------------------------------------
   Bill Extraction Panel
   ---------------------------------------------------------------- */

.extract-panel {
  margin: 20px 0;
  padding: 18px;
  border: 1px solid var(--brand-green);
  border-left: 4px solid var(--brand-green);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--brand-green-soft), var(--surface));
}

.extract-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.extract-grid div {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  transition: border-color 0.2s;
}

.extract-grid div:hover {
  border-color: var(--brand-green);
}

.extract-grid span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 720;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.extract-grid strong {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.25;
  overflow-wrap: anywhere;
  color: var(--ink);
}

.small {
  font-size: 13px;
}

/* ----------------------------------------------------------------
   Toggle & Checkbox Rows
   ---------------------------------------------------------------- */

.toggle-row {
  display: grid;
  gap: 10px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 30px;
}

.check-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--brand-green);
}

/* ----------------------------------------------------------------
   Internal Panel
   ---------------------------------------------------------------- */

.internal-panel {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 2px solid var(--brand-green);
}

.tab-panel {
  margin-top: 14px;
}

/* ----------------------------------------------------------------
   Summary Band (Recommendation)
   ---------------------------------------------------------------- */

.summary-band {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 20px;
  background: var(--black);
  border: 1px solid rgba(99, 146, 62, 0.3);
  border-radius: var(--radius-lg);
  color: #ffffff;
}

.summary-band .eyebrow {
  color: var(--brand-green-light);
}

.summary-band h2 {
  margin-top: 4px;
  font-family: "Rajdhani", "Inter", sans-serif;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.15;
  color: #ffffff;
}

.summary-band .muted {
  color: var(--light-grey);
  font-size: 13px;
}

.status-pill {
  flex: 0 0 auto;
  max-width: 240px;
  border-radius: var(--radius-full);
  padding: 7px 14px;
  font-size: 12px;
  font-weight: 750;
  color: var(--brand-green);
  background: var(--brand-green-soft);
  border: 1px solid rgba(99, 146, 62, 0.2);
  white-space: nowrap;
}

.status-pill.warn {
  color: var(--amber);
  background: var(--amber-soft);
  border-color: rgba(179, 106, 30, 0.2);
}

.status-pill.review {
  color: var(--blue);
  background: var(--blue-soft);
  border-color: rgba(36, 94, 143, 0.2);
}

/* ----------------------------------------------------------------
   Metric Cards
   ---------------------------------------------------------------- */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.metric-card {
  min-height: 100px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: all 0.25s ease;
}

.metric-card:hover {
  border-color: var(--brand-green);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.metric-card span {
  display: block;
  min-height: 36px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.1;
  overflow-wrap: anywhere;
  color: var(--brand-green);
  font-variant-numeric: tabular-nums;
}

/* ----------------------------------------------------------------
   Comparison Table
   ---------------------------------------------------------------- */

.comparison-section {
  margin-top: 12px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

th {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--surface-alt);
}

tr:last-child td {
  border-bottom: 0;
}

tr:hover td {
  background: rgba(99, 146, 62, 0.03);
}

.selected-row td {
  background: var(--brand-green-soft) !important;
  font-weight: 720;
  border-left: 3px solid var(--brand-green);
}

/* ----------------------------------------------------------------
   Detail Grid — Breakup & Notes
   ---------------------------------------------------------------- */

.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
  gap: 16px;
  margin-top: 18px;
}

.detail-card {
  padding: 20px;
  box-shadow: none;
}

.breakup-list {
  display: grid;
  gap: 4px;
  margin: 0;
}

.breakup-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.breakup-list div:last-child {
  border-bottom: 0;
  font-weight: 800;
  color: var(--brand-green);
  padding-top: 14px;
  margin-top: 4px;
  border-top: 2px solid var(--brand-green);
}

.breakup-list dt {
  color: var(--muted);
  font-size: 13px;
}

.breakup-list dd {
  margin: 0;
  text-align: right;
  font-weight: 720;
  font-variant-numeric: tabular-nums;
}

.notes-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.notes-list li::marker {
  color: var(--brand-green);
}

/* ----------------------------------------------------------------
   Password Dialog
   ---------------------------------------------------------------- */

.password-dialog {
  border: 0;
  border-radius: var(--radius-lg);
  padding: 0;
  box-shadow: var(--shadow-lg);
}

.password-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
}

.password-box {
  width: min(420px, calc(100vw - 32px));
  display: grid;
  gap: 16px;
  padding: 28px;
  background: var(--surface);
}

.password-box .eyebrow {
  color: var(--brand-green);
}

.password-box h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.error-text {
  color: var(--danger);
  font-size: 13px;
  font-weight: 700;
}

/* ----------------------------------------------------------------
   Utility
   ---------------------------------------------------------------- */

.hidden {
  display: none !important;
}

.muted {
  color: var(--muted);
}

/* ----------------------------------------------------------------
   Responsive
   ---------------------------------------------------------------- */

@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .input-panel {
    align-self: stretch;
  }
}

@media (max-width: 760px) {
  .app-header {
    position: sticky;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 12px;
  }

  .header-actions {
    width: 100%;
  }

  .mode-button {
    flex: 1;
  }

  .layout {
    padding: 16px;
    gap: 16px;
  }

  .input-panel,
  .results-panel {
    padding: 16px;
  }

  .field-grid,
  .extract-grid,
  .metric-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .summary-band {
    display: grid;
    gap: 12px;
  }

  .status-pill {
    max-width: 100%;
    justify-self: start;
  }

  .metric-card {
    min-height: 84px;
  }

  .upload-zone {
    padding: 18px 14px;
  }
}

/* ----------------------------------------------------------------
   Footer
   ---------------------------------------------------------------- */

.app-footer {
  background: var(--black);
  border-top: 3px solid var(--brand-green);
  padding: 24px 32px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1480px;
  margin: 0 auto;
}

.footer-brand {
  font-family: "Rajdhani", "Inter", sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
}

.footer-copy {
  color: var(--light-grey);
  font-size: 13px;
}

@media (max-width: 760px) {
  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .app-footer {
    padding: 20px 16px;
  }
}

/* ----------------------------------------------------------------
   Animations
   ---------------------------------------------------------------- */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-panel {
  animation: fadeIn 0.4s ease-out;
}

.extract-panel {
  animation: fadeIn 0.3s ease-out;
}

.metric-card {
  animation: fadeIn 0.35s ease-out both;
}

.metric-card:nth-child(2) { animation-delay: 0.05s; }
.metric-card:nth-child(3) { animation-delay: 0.1s; }
.metric-card:nth-child(4) { animation-delay: 0.15s; }