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

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background-color: #0f1117;
  color: #d7dce2;
  line-height: 1.7;
}

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

.container {
  width: 90%;
  max-width: 1400px;
  margin: auto;
}

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

header {
  border-bottom: 1px solid #232734;
  background-color: #11151d;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.logo span {
  color: #5fa8ff;
}

nav {
  display: flex;
  gap: 28px;
}

nav a {
  color: #c5ccd8;
  transition: color 0.2s;
  font-size: 15px;
}

nav a:hover {
  color: #5fa8ff;
}

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

.hero {
  padding: 90px 0 70px;
  border-bottom: 1px solid #232734;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero h1 {
  font-size: 58px;
  line-height: 1.15;
  margin-bottom: 24px;
  color: #ffffff;
}

.hero p {
  font-size: 18px;
  color: #b7bfca;
  margin-bottom: 28px;
  max-width: 720px;
}

.hero-buttons {
  display: flex;
  gap: 18px;
  margin-top: 35px;
}

.btn {
  padding: 14px 26px;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: #5fa8ff;
  color: #0f1117;
}

.btn-primary:hover {
  background-color: #7eb9ff;
}

.btn-secondary {
  border: 1px solid #394150;
  color: #d7dce2;
}

.btn-secondary:hover {
  border-color: #5fa8ff;
  color: #5fa8ff;
}

.btn-warning:hover {
  border-color: #5fa8ff;
  color: white;
}

.hero-image {
  background-color: #1a1f2b;
  border: 1px solid #2b3140;
  border-radius: 18px;
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

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

.image-placeholder {
  color: #6f7886;
  font-size: 18px;
  text-align: center;
  padding: 30px;
}

/* =====================================================
  FEATURES
===================================================== */

.section {
  padding: 90px 0;
}

.section-title {
  font-size: 42px;
  color: #ffffff;
  margin-bottom: 16px;
}

.section-subtitle {
  color: #aab2bf;
  max-width: 820px;
  margin-bottom: 55px;
  font-size: 17px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.feature-card {
  background-color: #171c25;
  border: 1px solid #262c39;
  border-radius: 16px;
  padding: 28px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #5fa8ff;
}

.feature-card h3 {
  color: #ffffff;
  margin-bottom: 14px;
  font-size: 22px;
}

.feature-card p {
  color: #adb5c1;
  font-size: 15px;
}

/* =====================================================
  SHOWCASE
===================================================== */

.showcase {
  background-color: #12161f;
  border-top: 1px solid #232734;
  border-bottom: 1px solid #232734;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.showcase-card {
  background-color: #171c25;
  border: 1px solid #262c39;
  border-radius: 16px;
  overflow: hidden;
}

.showcase-image {
  height: 240px;
  background-color: #1f2430;
  border-bottom: 1px solid #2b3140;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #707887;
  font-size: 16px;
}

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

.showcase-content {
  padding: 24px;
}

.showcase-content h3 {
  margin-bottom: 12px;
  color: #ffffff;
}

.showcase-content p {
  color: #b0b8c4;
  font-size: 15px;
}

/* =====================================================
ARCHITECTURE
===================================================== */

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.arch-card {
  background-color: #171c25;
  border: 1px solid #262c39;
  border-radius: 14px;
  padding: 24px;
}

.arch-card h3 {
  margin-bottom: 14px;
  color: #5fa8ff;
}

.arch-card ul {
  padding-left: 18px;
  color: #c2c9d4;
}

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

/* =====================================================
           CODE SECTION
        ===================================================== */

.code-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: center;
}

.code-block {
  background-color: #11151d;
  border: 1px solid #2c3444;
  border-radius: 14px;
  padding: 18px;
  overflow-x: auto;
}

pre {
  color: #d8dee9;
  font-size: 15px;
}

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

footer {
  border-top: 1px solid #232734;
  padding: 40px 0;
  color: #8993a3;
  font-size: 14px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

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

@media (max-width: 1000px) {
  .hero-grid, .code-wrapper {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1000px) {
  .hero h1 {
    font-size: 46px;
  }
}

@media (max-width: 700px) {
  nav {
    display: none;
  }
}

@media (max-width: 700px) {
  .hero {
    padding-top: 60px;
  }
}

@media (max-width: 700px) {
  .hero h1 {
    font-size: 38px;
  }
}

@media (max-width: 700px) {
  .section-title {
    font-size: 34px;
  }
}

.viewer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.viewer-image {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid #2b3140;
  background-color: #171c25;
}

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

.viewer-content h2 {
  font-size: 42px;
  color: #ffffff;
  margin-bottom: 20px;
}

.viewer-content p {
  color: #b5bec9;
  margin-bottom: 18px;
}

.viewer-badge {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 16px;
  border-radius: 999px;
  background-color: rgba(95,168,255,0.15);
  color: #5fa8ff;
  font-size: 13px;
  font-weight: 700;
}

.viewer-features {
  margin: 24px 0;
  padding-left: 18px;
}

.viewer-features li {
  margin-bottom: 10px;
  color: #c6ced8;
}

.viewer-buttons {
  display: flex;
  gap: 16px;
  margin-top: 28px;
}

.license-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 30px;
}

.license-header {
  text-align: center;
  margin-bottom: 50px;
}

.license-header h1 {
  color: #ffffff;
  font-size: 42px;
  margin-bottom: 10px;
}

.license-header p {
  color: #aab2bf;
}

.license-section {
  margin-bottom: 40px;
}

.license-section h2 {
  color: #5fa8ff;
  border-bottom: 1px solid #2b3140;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.license-section h3 {
  color: #ffffff;
  margin-top: 25px;
}

.license-section ul {
  padding-left: 25px;
}

.license-section li {
  margin-bottom: 10px;
}

.notice-box {
  background: #171c25;
  border: 1px solid #2b3140;
  border-left: 4px solid #5fa8ff;
  border-radius: 10px;
  padding: 20px;
  margin: 25px 0;
}

.warning-box {
  background: rgba(220,53,69,0.10);
  border: 1px solid rgba(220,53,69,0.35);
  border-left: 4px solid #dc3545;
  border-radius: 10px;
  padding: 20px;
  margin: 25px 0;
}

.acceptance {
  margin-top: 60px;
  padding: 25px;
  background: #171c25;
  border: 1px solid #2b3140;
  border-radius: 12px;
}