/* ========== RESET & BASE ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

:root {
  --brand: #0b1a33;
  --accent: #f0b429;
  --glass: rgba(255, 255, 255, 0.1);
  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.03);
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --bg-light: #f4f7fc;
  --text-light: #1a1f2b;
  --card-bg-light: #ffffff;
  --card-border-light: rgba(0, 0, 0, 0.02);
  --section-title-light: #0b1a33;
  --section-sub-light: #4a5a72;
  --faq-border-light: #e0e6ed;
  --article-meta-light: #6a7a8a;
  --article-text-light: #3a4a5a;
  --article-card-border-light: #eef2f7;
  --blockquote-bg-light: #ffffff;
  --howto-bg-light: #ffffff;
  --product-feature-bg-light: #ffffff;
  --product-feature-border-light: #eef2f7;
  --bg-dark: #0b0f17;
  --text-dark: #eaeef5;
  --card-bg-dark: #1a2235;
  --card-border-dark: #2a344a;
  --section-title-dark: #eaeef5;
  --section-sub-dark: #b0c0d0;
  --faq-border-dark: #2a344a;
  --article-meta-dark: #6a7a8a;
  --article-text-dark: #b0c0d0;
  --article-card-border-dark: #2a344a;
  --blockquote-bg-dark: #1a2235;
  --howto-bg-dark: #1a2235;
  --product-feature-bg-dark: #1a2235;
  --product-feature-border-dark: #2a344a;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg-light);
  color: var(--text-light);
  line-height: 1.6;
}

.dark body {
  background: var(--bg-dark);
  color: var(--text-dark);
}

/* ========== CONTAINER ========== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== HEADER ========== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 26, 51, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(240, 180, 41, 0.2);
  padding: 0 24px;
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1280px;
  margin: 0 auto;
}

.logo svg {
  height: 38px;
  width: auto;
  display: block;
}

.nav {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav a {
  color: #eaeef5;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.nav a:hover,
.nav a.active {
  border-bottom-color: var(--accent);
  color: #fff;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
}

.dark-toggle {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  border-radius: 40px;
  padding: 6px 14px;
  font-size: 0.9rem;
  cursor: pointer;
  margin-left: 18px;
  transition: var(--transition);
}

.dark-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

@media (max-width: 900px) {
  .nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(11, 26, 51, 0.97);
    flex-direction: column;
    padding: 20px 30px;
    gap: 16px;
    backdrop-filter: blur(10px);
    z-index: 99;
  }

  .nav.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }
}

/* ========== HERO ========== */
.hero {
  background: linear-gradient(145deg, #0b1a33 0%, #1b2f50 80%);
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(240, 180, 41, 0.08), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  color: #cfdbe8;
  font-size: 1.2rem;
  max-width: 540px;
  margin-bottom: 36px;
}

.hero-badge {
  display: inline-block;
  background: rgba(240, 180, 41, 0.2);
  color: var(--accent);
  padding: 6px 18px;
  border-radius: 50px;
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 18px;
  backdrop-filter: blur(4px);
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--accent);
  border: none;
  color: #0b1a33;
  padding: 14px 32px;
  border-radius: 60px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 8px 20px rgba(240, 180, 41, 0.3);
}

.btn-primary:hover {
  transform: scale(1.03);
  box-shadow: 0 12px 28px rgba(240, 180, 41, 0.5);
}

.btn-outline {
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: transparent;
  color: #fff;
  padding: 14px 32px;
  border-radius: 60px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-card {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}

.hero-card svg {
  width: 100%;
  height: auto;
}

@media (max-width: 800px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    margin: 0 auto 30px;
  }

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

/* ========== SECTION GENERAL ========== */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--section-title-light);
}

.dark .section-title {
  color: var(--section-title-dark);
}

.section-sub {
  color: var(--section-sub-light);
  max-width: 680px;
  margin-bottom: 48px;
  font-size: 1.1rem;
}

.dark .section-sub {
  color: var(--section-sub-dark);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: var(--card-bg-light);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--card-border-light);
}

.dark .card {
  background: var(--card-bg-dark);
  border-color: var(--card-border-dark);
}

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

.badge {
  background: var(--accent);
  color: #0b1a33;
  padding: 4px 12px;
  border-radius: 40px;
  font-size: 0.75rem;
  font-weight: 600;
  display: inline-block;
}

@media (max-width: 700px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ========== STATS ========== */
.stats {
  background: var(--brand);
  color: #fff;
}

.stats-grid {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 30px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.8rem;
  color: var(--accent);
  font-weight: 700;
}

.stat-item p {
  opacity: 0.7;
  margin-top: 4px;
}

/* ========== ARTICLE LIST ========== */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.article-card {
  padding: 20px;
  background: var(--card-bg-light);
  border-radius: 16px;
  border: 1px solid var(--article-card-border-light);
  transition: var(--transition);
}

.dark .article-card {
  background: var(--card-bg-dark);
  border-color: var(--article-card-border-dark);
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.article-card h4 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: inherit;
}

.article-card .meta {
  font-size: 0.8rem;
  color: var(--article-meta-light);
  margin-bottom: 12px;
}

.dark .article-card .meta {
  color: var(--article-meta-dark);
}

.article-card p {
  color: var(--article-text-light);
  font-size: 0.95rem;
}

.dark .article-card p {
  color: var(--article-text-dark);
}

.readmore {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  margin-top: 8px;
  transition: var(--transition);
}

.readmore:hover {
  text-decoration: underline;
}

/* ========== FAQ ========== */
.faq-item {
  border-bottom: 1px solid var(--faq-border-light);
  padding: 18px 0;
}

.dark .faq-item {
  border-color: var(--faq-border-dark);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  user-select: none;
}

.faq-question span {
  font-size: 1.3rem;
  transition: transform 0.2s ease;
}

.faq-item.open .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  padding-top: 12px;
  display: none;
  color: var(--article-text-light);
}

.dark .faq-answer {
  color: var(--article-text-dark);
}

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

/* ========== CONTACT & FOOTER ========== */
.contact-section {
  background: var(--brand);
  color: #fff;
}

.contact-section .badge {
  background: #fff;
  color: #0b1a33;
  padding: 8px 20px;
  font-size: 0.9rem;
}

.footer {
  background: #071121;
  color: #aabacf;
  padding: 40px 0;
  font-size: 0.9rem;
}

.footer a {
  color: #bccbd9;
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
}

.footer h4,
.footer h5 {
  margin-bottom: 12px;
}

.footer ul {
  list-style: none;
}

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

@media (max-width: 700px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ========== BACK TO TOP ========== */
.back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--accent);
  color: #0b1a33;
  border: none;
  border-radius: 60px;
  width: 48px;
  height: 48px;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
  display: none;
  z-index: 999;
  transition: var(--transition);
}

.back-top:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(240, 180, 41, 0.4);
}

.back-top.visible {
  display: block;
}

/* ========== SCROLL ANIMATIONS ========== */
.lazy-load {
  opacity: 0;
  transform: translateY(20px);
  transition: 0.7s ease;
}

.lazy-load.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== BLOCKQUOTE ========== */
blockquote {
  flex: 1;
  min-width: 200px;
  background: var(--blockquote-bg-light);
  padding: 20px;
  border-radius: 16px;
  border-left: 4px solid var(--accent);
  font-style: italic;
  transition: var(--transition);
}

.dark blockquote {
  background: var(--blockquote-bg-dark);
}

blockquote:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ========== HOWTO SECTION ========== */
.howto-card {
  background: var(--howto-bg-light);
  padding: 30px;
  border-radius: var(--radius);
}

.dark .howto-card {
  background: var(--howto-bg-dark);
}

.howto-card ol {
  padding-left: 20px;
  margin-top: 16px;
}

.howto-card ol li {
  margin-bottom: 8px;
}

/* ========== PRODUCT FEATURE ========== */
.product-feature {
  margin-top: 40px;
  background: var(--product-feature-bg-light);
  border-radius: var(--radius);
  padding: 30px;
  border: 1px solid var(--product-feature-border-light);
}

.dark .product-feature {
  background: var(--product-feature-bg-dark);
  border-color: var(--product-feature-border-dark);
}

.product-feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

@media (max-width: 600px) {
  .product-feature-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== RESPONSIVE MISC ========== */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .stat-item h3 {
    font-size: 2rem;
  }

  .back-top {
    width: 40px;
    height: 40px;
    font-size: 1.3rem;
    bottom: 20px;
    right: 20px;
  }
}

/* ========== DARK MODE OVERRIDES ========== */
.dark .card,
.dark .article-card,
.dark blockquote,
.dark .howto-card,
.dark .product-feature {
  background: var(--card-bg-dark);
  border-color: var(--card-border-dark);
}

.dark .article-card .meta {
  color: var(--article-meta-dark);
}

.dark .article-card p {
  color: var(--article-text-dark);
}

.dark .faq-answer {
  color: var(--article-text-dark);
}

.dark .section-title {
  color: var(--section-title-dark);
}

.dark .section-sub {
  color: var(--section-sub-dark);
}

.dark .faq-item {
  border-color: var(--faq-border-dark);
}

.dark .product-feature {
  background: var(--product-feature-bg-dark);
  border-color: var(--product-feature-border-dark);
}

/* ========== ACCESSIBILITY ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========== PRINT ========== */
@media print {
  header,
  .back-top,
  .nav-toggle,
  .dark-toggle {
    display: none !important;
  }

  section {
    padding: 20px 0;
    page-break-inside: avoid;
  }
}