/* ===== Design Tokens ===== */
:root {
  --color-dark: #0B2B1A;
  --color-dark-hover: #144D2F;
  --color-accent: #059669;
  --color-accent-hover: #047857;
  --color-bg: #F5FAF7;
  --color-white: #FFFFFF;
  --color-text: #4A5D52;
  --color-text-dark: #0B2B1A;
  --color-border: #B8DBCA;
  --color-card-shadow: rgba(96, 180, 140, 0.25);
  --color-faq-bg: #DFF0E7;
  --color-success: #10B981;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  color: var(--color-text-dark);
  font-weight: 600;
}

a {
  text-decoration: none;
  color: inherit;
}

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

/* ===== Utility ===== */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== Header ===== */
.header-initial {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  background: transparent;
}

.header-sticky {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--color-bg);
  box-shadow: 0px 19px 24px 0px rgba(136, 200, 168, 0.4);
  transform: translateY(-100%);
  transition: transform 0.3s ease;
  will-change: transform;
  backface-visibility: hidden;
}

.header-sticky.visible {
  transform: translateY(0);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  max-width: 1440px;
  margin: 0 auto;
}

.header-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-logo svg {
  flex-shrink: 0;
}

.header-nav {
  display: none;
  align-items: center;
  gap: 24px;
}

.header-nav a {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text-dark);
  transition: opacity 0.2s;
}

.header-nav a:hover {
  opacity: 0.7;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-install {
  display: none;
  height: 48px;
  padding: 0 24px;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-text-dark);
  color: var(--color-text-dark);
  font-weight: 600;
  font-size: 16px;
  border-radius: 9999px;
  background: transparent;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
  white-space: nowrap;
}

.btn-install:hover {
  background: var(--color-text-dark);
  color: var(--color-bg);
}

.hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--color-bg);
  flex-direction: column;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
}

.mobile-menu-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  padding: 48px 24px 80px;
}

.mobile-menu-nav {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.mobile-menu-nav a {
  font-size: 24px;
  font-weight: 400;
  color: var(--color-text-dark);
  transition: opacity 0.2s;
}

.mobile-menu-nav a:hover {
  opacity: 0.7;
}

.mobile-menu-cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-menu-cta .btn-cta {
  width: 100%;
  height: 56px;
  font-size: 20px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 160px 16px 60px;
  overflow: visible;
  background: radial-gradient(ellipse 120% 80% at 50% -10%, rgba(5, 150, 105, 0.15) 0%, rgba(16, 185, 129, 0.08) 40%, var(--color-bg) 70%);
}

.hero-content {
  max-width: 856px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 40px;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
}

.hero h1 {
  font-size: 32px;
  font-weight: 400;
  font-style: italic;
  line-height: 1.15;
  color: var(--color-text-dark);
}

.hero h1 strong {
  font-weight: 700;
}

.hero p {
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.5;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 56px;
  background: var(--color-dark);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 18px;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-cta:hover {
  background: var(--color-dark-hover);
}

/* ===== Features ===== */
.features {
  padding: 48px 16px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 40px;
}

.section-title em {
  font-weight: 400;
  font-style: italic;
}

.features-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.feature-card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 32px 24px;
  box-shadow: -1px 4px 18px 0px var(--color-card-shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--color-bg);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
}

.feature-card p {
  font-size: 15px;
  line-height: 1.5;
}

/* ===== How It Works ===== */
.how-it-works {
  padding: 48px 16px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

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

.step-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.step h3 {
  font-size: 20px;
  font-weight: 700;
}

.step p {
  font-size: 15px;
}

/* ===== Pricing ===== */
.pricing {
  padding: 48px 16px;
}

.pricing-card {
  max-width: 520px;
  margin: 0 auto;
  border-radius: 16px;
  padding: 40px 32px;
  background: linear-gradient(-1.9deg, rgba(5, 150, 105, 0.2) 2.85%, rgba(16, 185, 129, 0.08) 98.03%);
  box-shadow: -1px 4px 18px 0px var(--color-card-shadow);
  text-align: center;
}

.pricing-label {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.pricing-card h3 {
  font-size: 28px;
  margin-bottom: 16px;
}

.pricing-amount {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.pricing-amount span {
  font-size: 18px;
  font-weight: 400;
  color: var(--color-text);
}

.pricing-trial {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 32px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  font-size: 15px;
  color: var(--color-text-dark);
}

.pricing-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  background: var(--color-success);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
}

.pricing .btn-cta {
  max-width: 320px;
  margin: 0 auto;
}

.pricing-note {
  font-size: 13px;
  color: var(--color-text);
  margin-top: 16px;
}

/* ===== FAQ ===== */
.faq {
  padding: 48px 16px;
}

.faq-container {
  background: var(--color-white);
  box-shadow: -1px 4px 18px 0px var(--color-card-shadow);
  border-radius: 24px;
  padding: 32px 16px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 32px;
}

.faq-item {
  background: var(--color-faq-bg);
  border-radius: 20px;
  overflow: hidden;
  transition: border-radius 0.3s;
}

.faq-item.open {
  border-radius: 24px;
}

.faq-question {
  width: 100%;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.faq-question span {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-dark);
  line-height: 1.3;
}

.faq-toggle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-text-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.faq-toggle svg {
  width: 14px;
  height: 14px;
}

.faq-answer-wrapper {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease-in-out;
}

.faq-item.open .faq-answer-wrapper {
  grid-template-rows: 1fr;
}

.faq-answer-inner {
  overflow: hidden;
}

.faq-answer {
  padding: 0 16px 16px;
  border-top: 1px solid var(--color-text-dark);
  margin: 0 0 0 0;
  padding-top: 16px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--color-text-dark);
  line-height: 1.5;
}

.faq-answer p + p {
  margin-top: 12px;
}

/* ===== Catalog Grid ===== */
.catalog {
  padding: 48px 16px 80px;
}

.catalog-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.catalog-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: -1px 4px 18px 0px var(--color-card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
  color: inherit;
}

a.catalog-card:hover {
  transform: translateY(-4px);
  box-shadow: -1px 8px 28px 0px var(--color-card-shadow);
}

.catalog-card-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(5, 150, 105, 0.08), rgba(16, 185, 129, 0.15));
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.catalog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.catalog-card-image.no-image {
  background: linear-gradient(135deg, rgba(5, 150, 105, 0.1), rgba(16, 185, 129, 0.2));
}

.catalog-card-image.no-image img {
  display: none;
}

.catalog-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.catalog-card-tag {
  font-size: 13px;
  color: var(--color-text);
  font-weight: 400;
}

.catalog-card-tag strong {
  font-weight: 700;
  color: var(--color-accent);
}

.catalog-card h3 {
  font-size: 24px;
  font-weight: 700;
}

.catalog-card p {
  font-size: 15px;
  line-height: 1.5;
}

.catalog-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.catalog-price {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
}

.catalog-trial {
  font-size: 13px;
  color: var(--color-text);
  background: var(--color-faq-bg);
  padding: 2px 10px;
  border-radius: 9999px;
}

.catalog-card-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
  margin-top: 4px;
  transition: opacity 0.2s;
}

a.catalog-card:hover .catalog-card-link {
  opacity: 0.8;
}

/* Coming soon card */
.catalog-card-coming {
  border: 2px dashed var(--color-border);
  background: transparent;
  box-shadow: none;
  justify-content: center;
  min-height: 200px;
}

.catalog-card-coming .catalog-card-body {
  align-items: center;
  text-align: center;
}

.catalog-card-soon {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text);
  background: var(--color-faq-bg);
  padding: 4px 14px;
  border-radius: 9999px;
}

/* ===== Product Showcase (detail page) ===== */
.product-showcase {
  padding: 0 16px 48px;
}

.showcase-image {
  max-width: 960px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: -1px 4px 24px 0px var(--color-card-shadow);
  background: linear-gradient(135deg, rgba(5, 150, 105, 0.08), rgba(16, 185, 129, 0.15));
}

.showcase-image img {
  width: 100%;
  display: block;
}

.showcase-image.no-image {
  min-height: 200px;
}

.showcase-image.no-image img {
  display: none;
}

/* ===== Back Link (detail page) ===== */
.back-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  transition: opacity 0.2s;
}

.back-link:hover {
  opacity: 0.7;
}

.detail-hero .hero-content {
  gap: 32px;
}

/* ===== CTA ===== */
.cta {
  padding: 70px 16px 100px;
  text-align: center;
  background: radial-gradient(ellipse 80% 70% at 50% 100%, rgba(5, 150, 105, 0.2) 0%, rgba(16, 185, 129, 0.12) 40%, var(--color-bg) 70%);
}

.cta-content {
  max-width: 856px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
  align-items: center;
}

.cta h2 {
  font-size: 32px;
  font-weight: 600;
}

.cta h2 em {
  font-weight: 400;
  font-style: italic;
}

.cta p {
  font-size: 16px;
  max-width: 600px;
}

.cta .btn-cta {
  max-width: 288px;
}

/* ===== Footer ===== */
.footer {
  padding: 24px 16px;
}

.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-copyright {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-dark);
  transition: opacity 0.2s;
}

.footer-links a:hover {
  opacity: 0.7;
}

/* ===== Desktop (1280px+) ===== */
@media (min-width: 1280px) {
  .container {
    padding: 0 120px;
  }

  /* Header */
  .header-inner {
    padding: 20px 120px;
  }

  .header-nav {
    display: flex;
  }

  .btn-install {
    display: inline-flex;
  }

  .hamburger {
    display: none;
  }

  /* Hero */
  .hero {
    padding: 210px 120px 140px;
  }

  .hero-content {
    align-items: center;
    text-align: center;
    gap: 48px;
  }

  .hero-text {
    align-items: center;
  }

  .hero h1 {
    font-size: 56px;
    line-height: 1.08;
  }

  .btn-cta {
    width: 288px;
  }

  /* Catalog */
  .catalog {
    padding: 80px 120px;
  }

  .catalog-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .catalog-card {
    flex: 1 1 calc(50% - 12px);
    max-width: calc(50% - 12px);
  }

  /* Product Showcase */
  .product-showcase {
    padding: 0 120px 80px;
  }

  /* Features */
  .features {
    padding: 80px 120px;
  }

  .features .container {
    padding: 0;
  }

  .section-title {
    font-size: 44px;
    margin-bottom: 56px;
  }

  .features-grid {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 24px;
  }

  .feature-card {
    flex: 1 1 calc(50% - 12px);
    padding: 40px 32px;
  }

  /* How It Works */
  .how-it-works {
    padding: 80px 120px;
  }

  .steps {
    flex-direction: row;
    gap: 48px;
  }

  .step {
    flex: 1;
    position: relative;
  }

  .step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 28px;
    right: -28px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-border);
  }

  /* Pricing */
  .pricing {
    padding: 80px 120px;
  }

  .pricing-card {
    padding: 56px 48px;
  }

  /* FAQ */
  .faq {
    padding: 80px 16px;
  }

  .faq-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 96px 180px;
  }

  .faq .section-title {
    font-size: 44px;
  }

  .faq-question span {
    font-size: 20px;
  }

  /* CTA */
  .cta {
    padding: 70px 120px 140px;
  }

  .cta h2 {
    font-size: 44px;
  }

  /* Footer */
  .footer {
    padding: 24px 120px;
  }

  .footer-inner {
    flex-direction: row;
  }

  .footer-copyright {
    font-size: 16px;
  }

  .footer-links a {
    font-size: 16px;
  }
}

/* ===== Tablet (768px - 1279px) ===== */
@media (min-width: 768px) and (max-width: 1279px) {
  .hero {
    padding: 180px 40px 80px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .btn-cta {
    width: 288px;
  }

  .catalog {
    padding: 60px 40px;
  }

  .catalog-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .catalog-card {
    flex: 1 1 calc(50% - 12px);
    max-width: calc(50% - 12px);
  }

  .product-showcase {
    padding: 0 40px 60px;
  }

  .features {
    padding: 60px 40px;
  }

  .features-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .feature-card {
    flex: 1 1 calc(50% - 10px);
  }

  .how-it-works {
    padding: 60px 40px;
  }

  .pricing {
    padding: 60px 40px;
  }

  .faq {
    padding: 60px 24px;
  }

  .faq-container {
    padding: 48px 40px;
  }

  .cta {
    padding: 70px 40px 100px;
  }

  .footer {
    padding: 24px 40px;
  }
}