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

:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #ccfbf1;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --error: #dc2626;
  --success: #16a34a;
  --day-color: #f97316;
  --night-color: #3b82f6;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.hidden { display: none !important; }

/* ===== Progress Bar ===== */
.progress-bar {
  background: var(--card-bg);
  padding: 16px 24px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}
.progress-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  max-width: 800px;
  margin: 0 auto 10px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 3px;
  transition: width 0.4s ease;
  width: 16.6%;
}
.progress-labels {
  display: flex;
  justify-content: space-between;
  max-width: 800px;
  margin: 0 auto;
  font-size: 12px;
}
.progress-labels span {
  color: var(--text-muted);
  transition: color 0.3s;
}
.progress-labels span.active {
  color: var(--primary);
  font-weight: 600;
}
.progress-labels span.completed {
  color: var(--success);
}

/* ===== Container ===== */
.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px;
  min-height: calc(100vh - 60px);
}

/* ===== Landing ===== */
#screen-landing {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
}
.landing-card {
  text-align: center;
  background: var(--card-bg);
  border-radius: 20px;
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
  max-width: 500px;
  width: 100%;
}
.landing-logo {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 4px;
  margin-bottom: 16px;
}
.landing-card h1 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--text);
}
.landing-card .subtitle {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 15px;
}
.landing-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}
.landing-note {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== Buttons ===== */
.btn-primary, .btn-secondary, .btn-outline, .btn-link {
  border: none;
  border-radius: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
  background: var(--border);
  color: var(--text);
}
.btn-secondary:hover { background: #cbd5e1; }
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-link {
  background: none;
  color: var(--primary);
  padding: 4px 8px;
  font-size: 13px;
  text-decoration: underline;
}
.btn-lg { font-size: 17px; padding: 14px 32px; }
.btn-sm { font-size: 13px; padding: 8px 16px; }

/* ===== Form Cards ===== */
.form-card, .step-header {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.form-card h2, .step-header h2 {
  font-size: 22px;
  margin-bottom: 6px;
}
.form-desc {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 20px;
}
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 6px;
}
.form-group small {
  color: var(--text-muted);
  font-size: 12px;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  background: #fff;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}
.form-row {
  display: flex;
  gap: 16px;
}
.form-row .form-group { flex: 1; }
.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}
.req { color: var(--error); }

/* ===== OTP ===== */
.otp-section {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.otp-actions { margin-bottom: 12px; }
.otp-input-row label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}
.otp-code-input {
  display: flex;
  gap: 12px;
  align-items: center;
}
.otp-code-input input {
  width: 140px;
  text-align: center;
  font-size: 22px;
  letter-spacing: 4px;
  padding: 12px;
  border: 2px solid var(--primary);
  border-radius: 8px;
}
.otp-hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
  background: var(--accent-light);
  padding: 8px 12px;
  border-radius: 6px;
}

/* Honeypot field - hidden from humans, visible to bots */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

/* Phone hint */
#phoneHint {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Cooldown state for OTP button */
#sendOtpBtn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

#sendOtpBtn.cooldown {
  background: var(--text-muted);
  border-color: var(--text-muted);
  color: white;
}

/* ===== Category Tabs ===== */
.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.cat-tab {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card-bg);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}
.cat-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===== Appliance Grid ===== */
.appliance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.appliance-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  transition: border-color 0.2s;
}
.appliance-item.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}
.appliance-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.appliance-top input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary);
}
.appliance-name { font-weight: 600; font-size: 14px; flex: 1; }
.appliance-watts { font-size: 13px; color: var(--text-muted); }
.appliance-controls {
  display: flex;
  gap: 12px;
  align-items: end;
}
.appliance-controls .ctrl-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.appliance-controls label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}
.appliance-controls input {
  width: 70px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}
.day-input { border-left: 3px solid var(--day-color) !important; }
.night-input { border-left: 3px solid var(--night-color) !important; }
.qty-input { width: 50px !important; }
.appliance-energy {
  margin-top: 8px;
  font-size: 12px;
  display: flex;
  gap: 12px;
}
.appliance-energy .day-energy { color: var(--day-color); font-weight: 600; }
.appliance-energy .night-energy { color: var(--night-color); font-weight: 600; }
.appliance-energy .total-energy { color: var(--text); font-weight: 700; }

/* Custom appliance */
.custom-appliance-row {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.custom-appliance-row h4 { margin-bottom: 10px; font-size: 15px; }
.custom-appliance-form {
  display: flex;
  gap: 8px;
}
.custom-appliance-form input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}

/* ===== Load Summary ===== */
.load-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.summary-stat {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-label { font-size: 13px; color: var(--text-muted); display: block; }
.stat-value { font-size: 22px; font-weight: 700; color: var(--primary); display: block; margin: 4px 0; }
.stat-sub { font-size: 11px; color: var(--text-muted); }

/* ===== Advanced Options ===== */
.advanced-options {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.advanced-options h4 { font-size: 15px; }

/* ===== Savings Preview ===== */
.savings-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.savings-stat {
  text-align: center;
}
.savings-label { font-size: 12px; color: var(--text-muted); display: block; }
.savings-value { font-size: 20px; font-weight: 700; color: var(--success); display: block; margin-top: 4px; }

/* ===== Bill Reduction Target (highlighted) ===== */
.bill-reduction-row {
  margin-top: 20px;
}
.bill-reduction-row .form-group {
  flex: 1;
  max-width: none;
}
.bill-reduction-target {
  background: var(--accent-light);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
}
.bill-reduction-target label {
  color: #92400e;
  font-size: 16px;
  font-weight: 700;
}
.bill-reduction-target select {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-dark);
  background: #fff;
  border-color: var(--accent);
}
.bill-reduction-target small {
  color: #92400e;
  font-size: 13px;
}

/* ===== Step Navigation ===== */
.step-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}
.step-nav .btn-primary { margin-left: auto; }

/* ===== Design Results ===== */
.design-results {
  display: grid;
  gap: 16px;
}
.design-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.design-card h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--primary);
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 8px;
}
.design-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.design-grid .design-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.design-item .item-label { color: var(--text-muted); font-size: 14px; }
.design-item .item-value { font-weight: 700; font-size: 14px; }
.design-highlight {
  text-align: center;
  padding: 20px;
  background: var(--primary-light);
  border-radius: 10px;
  margin-bottom: 16px;
}
.design-highlight .highlight-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
}
.design-highlight .highlight-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* ===== Completion ===== */
#screen-complete {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
}
.completion-card {
  text-align: center;
  background: var(--card-bg);
  border-radius: 20px;
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
  max-width: 500px;
}
.completion-icon {
  font-size: 64px;
  color: var(--success);
  margin-bottom: 16px;
}
.completion-msg {
  color: var(--text-muted);
  margin: 16px 0 24px;
  font-size: 15px;
  line-height: 1.7;
}
.completion-contact {
  background: var(--bg);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 24px;
  text-align: left;
}
.completion-contact .contact-item {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 14px;
}
.completion-contact .contact-label { color: var(--text-muted); }
.completion-contact .contact-value { font-weight: 600; }

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 9999;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.toast.error { background: var(--error); }
.toast.success { background: var(--success); }

/* ===== Error Messages ===== */
.error-msg {
  color: var(--error);
  font-size: 14px;
  padding: 8px 12px;
  background: #fef2f2;
  border-radius: 6px;
  margin-top: 8px;
}

/* ===== Print Layout ===== */
.print-layout { display: none; }

@media print {
  body * { visibility: hidden; }
  #printLayout, #printLayout * { visibility: visible; }
  #printLayout {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    padding: 20px;
  }
  .print-layout {
    display: block !important;
    font-family: Arial, sans-serif;
    color: #000;
  }
  .print-header {
    text-align: center;
    border-bottom: 2px solid #0d9488;
    padding-bottom: 10px;
    margin-bottom: 16px;
  }
  .print-company {
    font-size: 24px;
    font-weight: 800;
    color: #0d9488;
  }
  .print-title {
    font-size: 16px;
    margin-top: 4px;
    color: #666;
  }
  .print-section { margin-bottom: 14px; }
  .print-section h4 {
    font-size: 13px;
    color: #0d9488;
    border-bottom: 1px solid #ddd;
    padding-bottom: 4px;
    margin-bottom: 6px;
  }
  .print-info-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 11px;
  }
  .print-info-table td {
    padding: 3px 6px;
    border: 1px solid #ddd;
  }
  .print-info-table td:first-child {
    font-weight: 600;
    background: #f8fafc;
    width: 30%;
  }
  .print-appliance-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 10px;
  }
  .print-appliance-table th, .print-appliance-table td {
    padding: 3px 4px;
    border: 1px solid #ddd;
    text-align: center;
  }
  .print-appliance-table th {
    background: #0d9488;
    color: #fff;
    font-weight: 600;
  }
  .print-signature {
    margin-top: 30px;
    display: flex;
    justify-content: space-between;
  }
  .print-sig-line {
    border-top: 1px solid #000;
    width: 200px;
    text-align: center;
    padding-top: 4px;
    font-size: 11px;
  }
  @page { size: A4; margin: 12mm; }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .form-row { flex-direction: column; gap: 0; }
  .appliance-grid { grid-template-columns: 1fr; }
  .load-summary { grid-template-columns: repeat(2, 1fr); }
  .savings-preview { grid-template-columns: 1fr; }
  .pattern-selector { flex-direction: column; }
  .design-grid { grid-template-columns: 1fr; }
  .step-nav { flex-wrap: wrap; }
}