:root {
  --primary: #0077b6;
  --primary-dark: #023e7a;
  --primary-light: #48cae4;
  --accent: #90e0ef;
  --ice: #caf0f8;
  --white: #ffffff;
  --off-white: #f8fcfd;
  --text: #03045e;
  --text-light: #475569;
  --line-green: #06c755;
  --shadow-sm: 0 2px 8px rgba(0, 119, 182, 0.08);
  --shadow-md: 0 8px 24px rgba(0, 119, 182, 0.12);
  --shadow-lg: 0 16px 48px rgba(0, 119, 182, 0.18);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Prompt', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--off-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 119, 182, 0.08);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  text-decoration: none;
}

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

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-text strong {
  font-weight: 800;
  font-size: 20px;
  color: var(--primary-dark);
}

.logo-text small {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-light);
  margin-top: 2px;
}

.nav-menu {
  display: flex;
  gap: 6px;
  list-style: none;
  align-items: center;
}

.nav-menu a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  padding: 8px 18px;
  border-radius: 100px;
  transition: var(--transition);
  display: inline-block;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--ice);
  color: var(--primary-dark);
}

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
  color: white !important;
  padding: 10px 20px !important;
  box-shadow: 0 4px 12px rgba(0, 119, 182, 0.3);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  font-size: 24px;
  color: var(--primary-dark);
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    box-shadow: var(--shadow-md);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    border-top: 1px solid rgba(0, 119, 182, 0.08);
    align-items: stretch;
  }
  
  .nav-menu.open {
    transform: translateY(0);
  }
  
  .nav-menu a {
    display: block;
    padding: 14px 20px;
    border-radius: 14px;
    text-align: center;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .logo-img {
    width: 42px;
    height: 42px;
  }
  
  .logo-text strong {
    font-size: 17px;
  }
  
  .logo-text small {
    font-size: 10px;
  }
}

/* Article page styles */
.article-page {
  padding-top: 68px;
  min-height: 100vh;
}

.article-hero {
  background: linear-gradient(180deg, var(--ice) 0%, var(--off-white) 100%);
  padding: 40px 20px 30px;
}

.article-hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  opacity: 0.5;
}

.article-category-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: white;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.article-title-main {
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

.article-meta-main {
  display: flex;
  gap: 16px;
  font-size: 14px;
  color: var(--text-light);
  flex-wrap: wrap;
  align-items: center;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(0, 119, 182, 0.1);
}

.article-meta-main span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-cover {
  max-width: 800px;
  margin: 0 auto 30px;
  padding: 0 20px;
}

.article-cover-img {
  aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 100px;
  box-shadow: var(--shadow-lg);
}

.article-cover-img.gradient-1 { background: linear-gradient(135deg, #48cae4, #0077b6); }
.article-cover-img.gradient-2 { background: linear-gradient(135deg, #90e0ef, #00b4d8); }
.article-cover-img.gradient-3 { background: linear-gradient(135deg, #caf0f8, #48cae4); }
.article-cover-img.gradient-4 { background: linear-gradient(135deg, #023e7a, #0077b6); }
.article-cover-img.gradient-5 { background: linear-gradient(135deg, #00b4d8, #023e7a); }
.article-cover-img.gradient-6 { background: linear-gradient(135deg, #90e0ef, #023e7a); }

.article-body {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.article-content {
  background: white;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

@media (min-width: 768px) {
  .article-content {
    padding: 48px;
    font-size: 17px;
  }
}

.article-content p {
  margin-bottom: 18px;
  color: var(--text-light);
}

.article-content p.lead {
  font-size: 18px;
  color: var(--text);
  font-weight: 500;
  line-height: 1.7;
  padding: 18px 20px;
  background: var(--ice);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  margin-bottom: 28px;
}

@media (min-width: 768px) {
  .article-content p.lead {
    font-size: 19px;
  }
}

.article-content h2 {
  font-size: clamp(22px, 4.5vw, 28px);
  font-weight: 700;
  color: var(--primary-dark);
  margin: 36px 0 16px;
  letter-spacing: -0.01em;
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  font-size: clamp(18px, 4vw, 21px);
  font-weight: 700;
  color: var(--primary-dark);
  margin: 28px 0 12px;
}

.article-content ul,
.article-content ol {
  margin: 16px 0 24px;
  padding-left: 4px;
}

.article-content ul li,
.article-content ol li {
  list-style: none;
  position: relative;
  padding-left: 32px;
  margin-bottom: 12px;
  color: var(--text-light);
}

.article-content ul li::before {
  content: '💧';
  position: absolute;
  left: 0;
  top: 0;
  font-size: 16px;
}

.article-content ol {
  counter-reset: list-counter;
}

.article-content ol li {
  counter-increment: list-counter;
}

.article-content ol li::before {
  content: counter(list-counter);
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}

.article-content strong {
  color: var(--primary-dark);
  font-weight: 700;
}

.article-content blockquote {
  background: linear-gradient(135deg, var(--ice), var(--off-white));
  padding: 22px 24px;
  border-radius: 16px;
  margin: 24px 0;
  border-left: 4px solid var(--primary);
  font-style: italic;
  color: var(--primary-dark);
  font-weight: 500;
}

.article-content blockquote::before {
  content: '"';
  font-size: 36px;
  line-height: 0;
  vertical-align: -10px;
  color: var(--primary);
  margin-right: 4px;
}

.info-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 24px;
  border-radius: 16px;
  margin: 28px 0;
}

.info-box h3 {
  color: white !important;
  margin-top: 0 !important;
  margin-bottom: 10px !important;
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-box p {
  color: rgba(255,255,255,0.92) !important;
  margin-bottom: 0 !important;
}

.tip-box {
  background: #fff8e6;
  border: 1px solid #ffd700;
  padding: 20px 22px;
  border-radius: 16px;
  margin: 24px 0;
}

.tip-box h3 {
  margin-top: 0 !important;
  margin-bottom: 8px !important;
  color: #8b6f00 !important;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px !important;
}

.tip-box p {
  color: #6b5500 !important;
  margin-bottom: 0 !important;
  font-size: 15px;
}

/* Article CTA */
.article-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  text-align: center;
  margin-top: 36px;
  position: relative;
  overflow: hidden;
}

.article-cta::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.article-cta h3 {
  font-size: clamp(20px, 5vw, 26px);
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.article-cta p {
  opacity: 0.9;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.article-cta-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.btn-white {
  background: white;
  color: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
}

/* Related articles */
.related-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 20px 60px;
}

.related-title {
  font-size: clamp(22px, 5vw, 28px);
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 24px;
  text-align: center;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .related-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.related-card {
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-decoration: none;
  display: block;
  color: inherit;
  border: 1px solid rgba(0, 119, 182, 0.06);
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.related-image {
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
}

.related-content {
  padding: 16px 18px;
}

.related-category {
  background: var(--ice);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 11px;
  display: inline-block;
  margin-bottom: 8px;
}

.related-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary-dark);
  line-height: 1.4;
}

/* Back button */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 20px;
  transition: var(--transition);
}

.back-link:hover {
  gap: 10px;
  color: var(--primary-dark);
}

/* Floating contacts */
.floating-contacts {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 999;
}

.floating-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 6px 18px rgba(0,0,0,0.2);
}

.floating-btn:hover {
  transform: scale(1.1);
}

.floating-btn.line {
  background: var(--line-green);
}

.floating-btn.call {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* Footer */
.footer {
  background: var(--text);
  color: white;
  padding: 40px 20px 20px;
}

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

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

@media (min-width: 640px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-content {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-logo img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.footer-logo strong {
  font-weight: 800;
  font-size: 20px;
}

.footer-brand p {
  font-size: 14px;
  opacity: 0.7;
  line-height: 1.7;
}

.footer-title {
  font-weight: 700;
  margin-bottom: 14px;
  font-size: 15px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  opacity: 0.6;
}