/* ==========================================================================
   PESCO BILL ONLINE CHECK - OFFICIAL DESIGN & CSS STYLESHEET
   Brand Colors: Emerald Green (#006633), Navy Blue (#0D47A1), Due Red (#D32F2F)
   Speed Optimization: 100% Native CSS, zero external UI framework overhead
   ========================================================================== */

:root {
  --pesco-green: #006633;
  --pesco-green-dark: #004D26;
  --pesco-green-light: #E6F0EA;
  --pesco-navy: #0D47A1;
  --pesco-navy-dark: #002171;
  --pesco-navy-light: #E8F0FE;
  --pesco-red: #D32F2F;
  --pesco-red-bg: #FFEBEE;
  --pesco-gold: #FF9800;
  --pesco-bg-light: #F4F9F5;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --border-color: #CBD5E1;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--pesco-bg-light);
  font-size: 16px;
  line-height: 1.5;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Utility Containers */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 12px;
}

/* Top Announcement / Notice Bar */
.top-notice-bar {
  background: var(--pesco-navy-dark);
  color: var(--white);
  font-size: 0.825rem;
  padding: 4px 0;
  text-align: center;
  font-weight: 500;
  border-bottom: 2px solid var(--pesco-gold);
}

.top-notice-bar span {
  background: var(--pesco-red);
  padding: 1px 6px;
  border-radius: 3px;
  margin-right: 6px;
  font-weight: 700;
  text-transform: uppercase;
}

/* Header & Navigation - Added 16px margin-bottom for exact card-to-card gap match */
.main-header {
  background: var(--white);
  border-bottom: 3px solid var(--pesco-green);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px; /* Match exact 16px gap between sections */
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  position: relative;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-logo img {
  height: 48px;
  width: 48px;
  object-fit: contain;
}

.brand-title-group {
  display: flex;
  flex-direction: column;
}

.brand-title-main {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--pesco-green);
  line-height: 1.1;
  letter-spacing: 0.5px;
}

.brand-title-main span {
  color: var(--pesco-navy);
}

.brand-title-sub {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  gap: 16px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--pesco-green);
  background: var(--pesco-green-light);
}

/* Mobile Hamburger Toggle Button */
.hamburger-btn {
  display: none;
  background: var(--pesco-green-light);
  border: 1px solid var(--pesco-green);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
}

.hamburger-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--pesco-green-dark);
  transition: all 0.3s ease;
}

main {
  flex: 1;
  padding: 0 0 16px 0;
}

/* Hero Section Styling */
.hero-box {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.hero-box p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 10px;
}

/* Hero Section Button ("Pesco Bill Check") */
.btn-hero-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--pesco-green);
  color: var(--white);
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  margin-top: 16px;
  box-shadow: var(--shadow-md);
  transition: all 0.2s ease;
  border: 2px solid var(--pesco-green-dark);
  cursor: pointer;
}

.btn-hero-check:hover {
  background: var(--pesco-green-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.section-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

/* PC Desktop Heading Sizes (H1: 34px, H2: 32px, H3: 26px) */
h1 {
  font-size: 34px;
  color: var(--pesco-green-dark);
  font-weight: 800;
  line-height: 1.25;
}

h2, h2.section-title, .tool-header h2 {
  font-size: 32px;
  color: var(--pesco-green-dark);
  font-weight: 700;
  border-bottom: 2px solid var(--pesco-green-light);
  padding-bottom: 6px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

h2.section-title svg {
  fill: var(--pesco-green);
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

h3, .content-block h3, .faq-question h3 {
  font-size: 26px;
  color: var(--pesco-navy-dark);
  font-weight: 700;
  margin-top: 14px;
  margin-bottom: 8px;
}

/* ==========================================================================
   OFFICIAL BILL CHECKER TOOL FORM
   ========================================================================== */
.tool-box {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--pesco-green-light) 100%);
  border: 2px solid var(--pesco-green);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-md);
  margin-bottom: 16px;
  margin-top: 16px;
}

.tool-header {
  text-align: center;
  margin-bottom: 12px;
}

.tool-header h2 {
  font-size: 1.3rem;
  color: var(--pesco-green-dark);
  font-weight: 800;
  margin-bottom: 4px;
}

.tool-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Dual Mode Toggle */
.mode-toggle-group {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 12px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  background: var(--white);
  padding: 6px 14px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  transition: all 0.2s ease;
}

.radio-label:has(input:checked) {
  border-color: var(--pesco-green);
  background: var(--pesco-green);
  color: var(--white);
}

.radio-label input {
  accent-color: var(--pesco-navy);
}

/* Tool Input Group */
.input-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.ref-input {
  width: 100%;
  padding: 12px 14px;
  font-size: 1.1rem;
  font-family: monospace, sans-serif;
  font-weight: 700;
  letter-spacing: 1px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s;
  color: var(--text-primary);
}

.ref-input:focus {
  border-color: var(--pesco-green);
  box-shadow: 0 0 0 3px rgba(0, 102, 51, 0.15);
}

.action-buttons {
  display: flex;
  gap: 10px;
}

.btn-submit {
  flex: 2;
  background: var(--pesco-green);
  color: var(--white);
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s;
}

.btn-submit:hover {
  background: var(--pesco-green-dark);
}

.btn-save {
  flex: 1;
  background: var(--pesco-navy);
  color: var(--white);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-save:hover {
  background: var(--pesco-navy-dark);
}

/* History / Quick Check Chips */
.saved-history {
  margin-top: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.history-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.history-chip {
  background: var(--white);
  border: 1px solid var(--pesco-green);
  color: var(--pesco-green-dark);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.history-chip .delete-chip {
  color: var(--pesco-red);
  font-weight: bold;
  cursor: pointer;
}

/* Visual Reference Guide */
.guide-box {
  background: var(--white);
  border: 1px dashed var(--pesco-navy);
  border-radius: var(--radius-md);
  padding: 12px;
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.guide-badge {
  background: var(--pesco-navy-light);
  color: var(--pesco-navy);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  white-space: nowrap;
}

.guide-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   PESCO UNIT BILL CALCULATOR
   ========================================================================== */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.calc-input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.calc-input-group label {
  font-size: 0.9rem;
  font-weight: 600;
}

.calc-input-group input, .calc-input-group select {
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
}

.btn-calc {
  background: var(--pesco-navy);
  color: var(--white);
  font-weight: 700;
  border: none;
  padding: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  width: 100%;
}

.calc-result-box {
  background: var(--pesco-navy-light);
  border: 1px solid var(--pesco-navy);
  border-radius: var(--radius-md);
  padding: 12px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  padding: 4px 0;
  border-bottom: 1px dashed rgba(0,0,0,0.1);
}

.result-row.total {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--pesco-navy-dark);
  border-top: 2px solid var(--pesco-navy);
  border-bottom: none;
  margin-top: 6px;
  padding-top: 6px;
}

/* Data Tables (Tariff & Peak Hours) */
.custom-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 8px;
}

.custom-table th, .custom-table td {
  border: 1px solid var(--border-color);
  padding: 8px;
  text-align: left;
}

.custom-table th {
  background: var(--pesco-green);
  color: var(--white);
  font-weight: 600;
}

.custom-table tr:nth-child(even) {
  background: var(--pesco-bg-light);
}

/* FAQ Accordion */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: var(--white);
  padding: 10px 12px;
  font-size: 0.95rem;
  text-align: left;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question h3 {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 600;
}

.faq-question:hover {
  background: var(--pesco-green-light);
}

.faq-answer {
  padding: 10px 12px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--pesco-bg-light);
  display: none;
  border-top: 1px solid var(--border-color);
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question h3 {
  color: var(--pesco-green-dark);
  font-weight: 700;
}

/* Content Box */
.content-block {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.content-block p {
  margin-bottom: 10px;
}

.content-block ul {
  padding-left: 20px;
  margin-bottom: 10px;
}

/* Footer */
.main-footer {
  background: var(--pesco-navy-dark);
  color: var(--white);
  padding: 24px 0 12px 0;
  margin-top: 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 16px;
}

.footer-col h4 {
  color: var(--pesco-gold);
  font-size: 1rem;
  margin-bottom: 8px;
}

.footer-col p, .footer-col li a {
  color: #CBD5E1;
  font-size: 0.85rem;
  text-decoration: none;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 6px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 12px;
  text-align: center;
  font-size: 0.8rem;
  color: #94A3B8;
}

/* ==========================================================================
   MOBILE SPECIFIC RULES
   ========================================================================== */
@media (max-width: 640px) {
  .main-header {
    position: relative !important;
    top: auto !important;
    margin-bottom: 8px !important;
  }

  .header-wrapper {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    padding: 8px 4px !important;
  }

  .hamburger-btn {
    display: flex !important;
    margin-left: auto !important;
    margin-right: 0 !important;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    border-bottom: 2px solid var(--pesco-green);
    box-shadow: var(--shadow-md);
    z-index: 200;
  }

  .nav-links.active {
    display: flex !important;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 10px 16px;
    border-bottom: 1px solid var(--pesco-green-light);
    border-radius: 0;
  }

  /* Mobile Typography Rules (Paragraphs: 17px, H2: 26px, H3: 24px) */
  p, .content-block p, .hero-box p, .guide-text, .tool-header p, li {
    font-size: 17px !important;
    line-height: 1.6 !important;
  }

  h2, h2.section-title, .tool-header h2 {
    font-size: 26px !important;
    line-height: 1.25 !important;
  }

  h3, .content-block h3, .faq-question h3 {
    font-size: 24px !important;
    line-height: 1.3 !important;
  }

  /* Mobile Spacing & Padding Optimization */
  .container {
    padding: 0 8px !important;
  }

  main {
    padding: 0 0 12px 0 !important;
  }

  .hero-box {
    padding: 14px 12px !important;
    margin-bottom: 12px !important;
  }

  .section-card {
    padding: 14px 12px !important;
    margin-bottom: 12px !important;
  }

  .tool-box {
    padding: 16px 12px !important;
    margin-bottom: 12px !important;
    margin-top: 12px !important;
  }

  .btn-hero-check {
    width: 100%;
    padding: 12px !important;
    font-size: 1rem !important;
  }

  .guide-box {
    padding: 10px 12px !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 6px !important;
  }

  .input-row {
    gap: 8px !important;
  }

  .ref-input {
    padding: 10px 12px !important;
    font-size: 1rem !important;
  }

  .btn-submit, .btn-save {
    padding: 10px 12px !important;
    font-size: 0.95rem !important;
  }

  .calc-grid {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
  }

  .calc-result-box {
    padding: 12px !important;
  }

  .faq-question, .faq-answer {
    padding: 10px 12px !important;
  }

  .footer-grid {
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }
}