/* APMC Calculator - Material 3 Design System Stylesheet */

:root {
  /* Brand Color Tokens */
  --md-primary: #2E7D32;
  --md-primary-dark: #1B5E20;
  --md-primary-light: #E8F5E9;
  --md-accent: #F9A825;
  --md-accent-hover: #F57F17;
  --md-background: #F8FAF8;
  --md-surface: #FFFFFF;
  --md-border: #E5E7EB;
  --md-border-focus: #2E7D32;
  --md-text: #1F2937;
  --md-text-secondary: #6B7280;

  /* Material 3 Shadows & Elevation */
  --md-shadow-1: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
  --md-shadow-2: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --md-shadow-3: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --md-shadow-hover: 0 14px 20px -4px rgba(46, 125, 50, 0.12), 0 6px 8px -2px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-family: 'Roboto', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-card: 16px;
  --radius-button: 28px;
  --radius-pill: 9999px;

  /* Layout & Spacing */
  --max-width: 1200px;
  --header-height: 72px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  color: var(--md-text);
  background-color: var(--md-background);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--md-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--md-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Sticky Header & Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--md-border);
  box-shadow: var(--md-shadow-1);
  transition: all var(--transition-fast);
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--md-text);
}

.brand-logo img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: var(--md-shadow-1);
}

.brand-title {
  color: var(--md-primary-dark);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--md-text-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--md-primary);
  background-color: var(--md-primary-light);
}

/* Mobile Nav Drawer Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--md-text);
  border-radius: 8px;
}

.mobile-toggle svg {
  width: 28px;
  height: 28px;
}

/* Layout Containers */
.main-content {
  flex: 1;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--md-primary-dark);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--md-text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

/* Hero Section */
.hero-section {
  padding: 4rem 1.5rem 5rem;
  background: linear-gradient(135deg, rgba(232, 245, 233, 0.6) 0%, rgba(248, 250, 248, 1) 100%);
  border-bottom: 1px solid var(--md-border);
}

.hero-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background-color: var(--md-primary-light);
  color: var(--md-primary-dark);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1.25rem;
  border: 1px solid rgba(46, 125, 50, 0.2);
}

.hero-heading {
  font-size: 2.75rem;
  line-height: 1.2;
  font-weight: 800;
  color: var(--md-text);
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.hero-heading span {
  color: var(--md-primary);
}

.hero-subheading {
  font-size: 1.15rem;
  color: var(--md-text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Material 3 Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  box-shadow: var(--md-shadow-1);
}

.btn-primary {
  background-color: var(--md-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--md-primary-dark);
  color: #ffffff;
  box-shadow: var(--md-shadow-2);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--md-surface);
  color: var(--md-primary-dark);
  border: 1px solid var(--md-border);
}

.btn-secondary:hover {
  background-color: var(--md-primary-light);
  border-color: var(--md-primary);
  color: var(--md-primary-dark);
  transform: translateY(-2px);
}

.hero-media {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image {
  border-radius: 20px;
  box-shadow: var(--md-shadow-3);
  max-width: 100%;
  border: 4px solid var(--md-surface);
  transition: transform var(--transition-normal);
}

.hero-image:hover {
  transform: translateY(-4px);
}

/* Material 3 Cards Grid */
.section-title-wrap {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--md-text);
  margin-bottom: 0.5rem;
}

.section-description {
  color: var(--md-text-secondary);
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.m3-card {
  background-color: var(--md-surface);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  border: 1px solid var(--md-border);
  box-shadow: var(--md-shadow-1);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.m3-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--md-shadow-hover);
  border-color: rgba(46, 125, 50, 0.3);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--md-primary-light);
  color: var(--md-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.card-icon svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--md-text);
  margin-bottom: 0.5rem;
}

.card-text {
  font-size: 0.95rem;
  color: var(--md-text-secondary);
  line-height: 1.5;
}

/* Why Choose Section */
.why-choose-section {
  background-color: var(--md-surface);
  border-top: 1px solid var(--md-border);
  border-bottom: 1px solid var(--md-border);
  padding: 4rem 1.5rem;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.why-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--md-background);
  border-radius: var(--radius-card);
  border: 1px solid var(--md-border);
}

.why-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--md-primary-light);
  color: var(--md-primary-dark);
  font-weight: 700;
  margin-bottom: 1rem;
}

.why-badge svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

/* About Section */
.about-section {
  padding: 4rem 1.5rem;
}

.about-card {
  max-width: var(--max-width);
  margin: 0 auto;
  background: var(--md-surface);
  border-radius: var(--radius-card);
  padding: 2.5rem;
  border: 1px solid var(--md-border);
  box-shadow: var(--md-shadow-1);
}

.about-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
  list-style: none;
}

.about-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  color: var(--md-text);
}

.about-item svg {
  width: 22px;
  height: 22px;
  fill: var(--md-primary);
  flex-shrink: 0;
}

/* Policy & Static Content Pages */
.policy-container {
  max-width: 900px;
  margin: 0 auto;
}

.policy-card {
  background-color: var(--md-surface);
  border-radius: var(--radius-card);
  padding: 2rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--md-border);
  box-shadow: var(--md-shadow-1);
}

.policy-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--md-primary-dark);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.policy-card h2 svg {
  width: 24px;
  height: 24px;
  fill: var(--md-primary);
}

.policy-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--md-text);
  margin: 1.25rem 0 0.5rem;
}

.policy-card p {
  color: var(--md-text-secondary);
  margin-bottom: 1rem;
}

.policy-card p:last-child {
  margin-bottom: 0;
}

.policy-card ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--md-text-secondary);
}

.policy-card li {
  margin-bottom: 0.5rem;
}

/* Contact Page Components */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 2rem;
}

.contact-info-card {
  background: var(--md-surface);
  border-radius: var(--radius-card);
  padding: 2rem;
  border: 1px solid var(--md-border);
  box-shadow: var(--md-shadow-1);
}

.contact-method {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background-color: var(--md-primary-light);
  color: var(--md-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* Interactive FAQ Accordion */
.faq-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--md-surface);
  border-radius: var(--radius-card);
  border: 1px solid var(--md-border);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--md-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  fill: var(--md-text-secondary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  fill: var(--md-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  padding: 0 1.5rem;
  color: var(--md-text-secondary);
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem 1.5rem;
}

/* Footer Section */
.site-footer {
  background-color: var(--md-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: 3.5rem 1.5rem 2rem;
  margin-top: 4rem;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #ffffff;
  font-size: 1.3rem;
  font-weight: 700;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-desc {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 380px;
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--md-accent);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-m3-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 500;
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-heading {
    font-size: 2.25rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--md-surface);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: var(--md-shadow-3);
    border-bottom: 1px solid var(--md-border);
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-toggle {
    display: block;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .hero-heading {
    font-size: 1.85rem;
  }

  .page-title {
    font-size: 1.75rem;
  }
}