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

:root {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-card: #3a3a3a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent-color: #ff4757;
  --accent-hover: #ff6b7a;
  --border-color: #444444;
  --font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  background-color: var(--bg-secondary);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.5px;
}

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

.nav-buttons {
  display: flex;
  gap: 1rem;
}

/* Buttons */
.btn {
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--text-primary);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-color);
  border: 2px solid var(--accent-color);
}

.btn-outline:hover {
  background-color: var(--accent-color);
  color: var(--text-primary);
}

.btn-full {
  width: 100%;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.content-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 2rem;
}

/* Featured Card */
.featured-card {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.featured-card:hover {
  transform: translateY(-4px);
}

.card-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem;
}

.card-content h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
  line-height: 1.4;
}

.card-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-card {
  background-color: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.sidebar-card:hover {
  transform: translateY(-4px);
}

.sidebar-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.sidebar-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

/* Links */
.link-arrow {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap 0.2s ease;
}

.link-arrow:hover {
  color: var(--accent-hover);
  gap: 0.5rem;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.footer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: 12px;
  width: 90%;
  max-width: 400px;
  position: relative;
}

.modal-content h2 {
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.close-btn:hover {
  color: var(--text-primary);
}

/* Auth Form */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.auth-form input {
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.auth-form input::placeholder {
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .header-container {
    flex-direction: column;
    gap: 1rem;
  }

  .card-image img {
    height: 250px;
  }

  .main-content {
    padding: 1rem;
  }
}