/* ============================================
   RENOPLOT.COM — GLOBAL STYLES
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --accent: #f97316;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --white: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   HEADER
   ============================================ */

.site-header {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 60%, #3b82f6 100%);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(37,99,235,0.18);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-icon {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
}

.logo-text span {
  color: #93c5fd;
}

.header-tagline {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.65);
  font-weight: 400;
  display: none;
}

@media (min-width: 640px) {
  .header-tagline { display: block; }
}

/* ============================================
   HERO
   ============================================ */

.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 60%, #3b82f6 100%);
  padding: 56px 24px 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--bg);
  clip-path: ellipse(55% 100% at 50% 100%);
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1.15;
  max-width: 700px;
  margin: 0 auto 16px;
}

.hero h1 span {
  color: #93c5fd;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  color: rgba(255,255,255,0.8);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================
   MAIN LAYOUT
   ============================================ */

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* ============================================
   CALCULATOR GRID
   ============================================ */

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.calc-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 28px 24px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.calc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #60a5fa);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.calc-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: #bfdbfe;
}

.calc-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.card-cta {
  margin-top: auto;
  padding-top: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  background: var(--white);
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.footer-logo span {
  color: var(--primary);
}

.footer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   CALCULATOR PAGE LAYOUT
   ============================================ */

.calc-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.calc-page-header {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 0;
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.calc-page-title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 8px;
}

.calc-page-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 580px;
}

/* ============================================
   TWO-PANEL CALCULATOR
   ============================================ */

.calc-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .calc-panels {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.panel {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.panel-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */

.field {
  margin-bottom: 20px;
}

.field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.field input,
.field select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--white);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  outline: none;
  appearance: none;
}

.field input:focus,
.field select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.field-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* ============================================
   BUTTON
   ============================================ */

.btn-calculate {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  letter-spacing: 0.01em;
  margin-top: 8px;
}

.btn-calculate:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.3);
}

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

/* ============================================
   RESULTS PANEL
   ============================================ */

.results-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  color: var(--text-muted);
  text-align: center;
  gap: 12px;
}

.results-placeholder-icon {
  font-size: 40px;
  opacity: 0.4;
}

.results-placeholder p {
  font-size: 0.9rem;
}

.result-main {
  text-align: center;
  padding: 24px 0 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.result-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.result-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.04em;
  line-height: 1;
  animation: countUp 0.4s ease;
}

.result-unit {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 4px;
}

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

.result-breakdown {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.breakdown-label {
  color: var(--text-secondary);
  font-weight: 500;
}

.breakdown-value {
  font-weight: 700;
  color: var(--text-primary);
}

.result-note {
  margin-top: 20px;
  padding: 12px 16px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: #92400e;
  line-height: 1.55;
}

/* ============================================
   INFO SECTION
   ============================================ */

.info-section {
  margin-top: 48px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.info-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.info-section h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 24px 0 8px;
}

.info-section p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.info-section ul {
  padding-left: 20px;
  margin-bottom: 12px;
}

.info-section ul li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 4px;
}

/* ============================================
   DISCLAIMER
   ============================================ */

.disclaimer {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.8rem;
  color: #1e40af;
  line-height: 1.55;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 480px) {
  .panel {
    padding: 20px 16px;
  }

  .hero {
    padding: 40px 20px 56px;
  }

  .result-number {
    font-size: 2.5rem;
  }
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
}

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