:root {
  --primary: #007ACC;
  --secondary: #FF6F61;
  --bg-color: #ffffff;
  --text-color: #171717;
  --text-muted: #555555;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  --bento-radius: 24px;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--secondary);
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 5%;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  text-transform: lowercase;
  color: var(--text-color);
}

.logo span {
  color: var(--secondary);
}

/* Bento Grid Layout */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 20px;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(180px, auto);
  gap: 20px;
}

.bento-item {
  background: #fcfcfc;
  border-radius: var(--bento-radius);
  padding: 30px;
  border: 1px solid #f0f0f0;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.bento-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow);
  border-color: var(--primary);
}

.bento-item.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
}

.large {
  grid-column: span 2;
  grid-row: span 2;
}

.wide {
  grid-column: span 2;
}

.tall {
  grid-row: span 2;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #005fa3;
  color: #ffffff;
  transform: scale(1.02);
}

.btn-secondary {
  background-color: var(--secondary);
  color: #ffffff;
}

.btn-secondary:hover {
  background-color: #e65b50;
  color: #ffffff;
  transform: scale(1.02);
}

/* Japanese Elements & Accents */
.bento-item::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background-image: radial-gradient(var(--secondary) 1px, transparent 1px);
  background-size: 10px 10px;
  opacity: 0.1;
  pointer-events: none;
}

.accent-circle {
  width: 40px;
  height: 40px;
  background-color: var(--secondary);
  border-radius: 50%;
  margin-bottom: 1rem;
}

/* Forum & Content Areas */
.content-section {
  padding: 60px 0;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

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

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

  .large,
  .wide,
  .tall {
    grid-column: span 1;
    grid-row: span 1;
  }
}

/* Glass Effect */
.glass-effect {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/* Japanese Pattern Utility */
.japanese-pattern {
  background-color: #ffffff;
  background-image: radial-gradient(#007ACC 0.5px, transparent 0.5px), radial-gradient(#007ACC 0.5px, #ffffff 0.5px);
  background-size: 20px 20px;
  background-position: 0 0, 10px 10px;
  background-attachment: fixed;
  opacity: 0.03;
}