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

body {
  background: #111;
  color: #d9d9d9;
  font-family: "Montserrat", sans-serif;
  line-height: 1.7;
}

a {
  color: #fff;
  text-decoration: none;
}

a:hover {
  opacity: 0.8;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  padding: 20px 0;
  border-bottom: 1px solid #2a2a2a;
}

.logo {
  font-size: 1.1rem;
  font-weight: bold;
  letter-spacing: 0.04em;
}

.hero {
  padding: 18px 0 10px;
}

.hero h1 {
  font-size: 2.2rem;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero h2 {
  font-size: 1.35rem;
  font-weight: 400;
  color: #d0d0d0;
  margin-bottom: 24px;
}

.hero p {
  max-width: 700px;
  color: #b8b8b8;
  font-size: 1.05rem;
  margin-bottom: 14px;
}

.button {
  display: inline-block;
  padding: 14px 22px;
  border: 1px solid #fff;
  border-radius: 6px;
  font-weight: 600;
}

section {
  padding: 22px 0;
  border-top: 1px solid #2a2a2a;
}

section h3 {
  font-size: 1.4rem;
  margin-top: 20px;
  margin-bottom: 6px;
}

section h3:first-of-type {
  margin-top: 0;
}

section p {
  margin-bottom: 16px;
  color: #d0d0d0;
}

p,
li {
  color: #d0d0d0;
  font-weight: 400;
}

h1,
h2,
h3 {
  color: #ffffff;
  font-weight: 600;
}

strong {
  color: #ffffff;
  font-weight: 600;
}

ul {
  margin: 16px 0 24px 0;
  padding-left: 18px;
}

li {
  margin-bottom: 10px;
}

.about p {
  max-width: 720px;
}

.about-content {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.about-photo {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
}

.about-text {
  max-width: 720px;
}

@media (max-width: 700px) {
  .about-content {
    flex-direction: column;
  }

  .about-photo {
    width: 110px;
    height: 110px;
  }
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.links a {
  border-bottom: 1px solid #444;
  padding-bottom: 2px;
  transition: border-color 0.2s ease;
}

.links a:hover {
  border-color: #fff;
}

.links a:first-child {
  border-bottom: 1px solid #fff;
}

.project-architecture {
  margin: 24px 0 40px;
}

.architecture-diagram {
  display: block;
  width: 100%;
  max-width: 900px;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
  border: 1px solid #e5e5e5;
}

footer {
  padding: 32px 0 48px;
  color: #888;
  font-size: 0.95rem;
}

@media (max-width: 700px) {
  .hero {
    padding: 56px 0 40px;
  }

  .hero h1 {
    font-size: 1.9rem;
  }

  .hero h2 {
    font-size: 1.05rem;
  }
}

.logo a {
  display: inline-block;
}

.logo img {
  display: block;
}

.decision {
  margin-bottom: 24px;
}

.decision-detail {
  margin-left: 20px;
  border-left: 2px solid #2a2a2a;
  padding-left: 12px;
}

.challenge {
  margin-bottom: 24px;
}

.challenge-detail {
  margin-left: 20px;
  border-left: 2px solid #2a2a2a;
  padding-left: 12px;
}

.content-block {
  margin-left: 20px;
  border-left: 2px solid #2a2a2a;
  padding-left: 12px;
}

.content-block ul {
  margin-top: 12px;
}

.content-block .project-architecture {
  margin-top: 8px;
}

.project-card {
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  padding: 16px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card h4 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.project-card p {
  color: #b8b8b8;
  margin-bottom: 8px;
}

.project-card img {
  width: 100%;
  max-width: 380px;
  height: auto;
  display: block;
  margin: 8px 0 16px 0;
  border-radius: 6px;
}

.project-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.project-card-link:hover .project-card {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

img {
  max-width: 100%;
}