/* ============================================
   じくのホームページ — Design System
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+JP:wght@300;400;500;700;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --bg-primary: #0a0a1a;
  --bg-secondary: #0f0f2e;
  --bg-gradient-1: #0a0a1a;
  --bg-gradient-2: #0d1b2a;
  --bg-gradient-3: #1b0a2e;

  --text-primary: #f0f0f8;
  --text-secondary: #a0a0c0;
  --text-muted: #6a6a90;

  --accent-1: #7c3aed;
  --accent-2: #06b6d4;
  --accent-3: #f472b6;
  --accent-4: #34d399;

  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-primary: 'Inter', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-6xl: 4.5rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Borders */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* ---------- Background Gradient Overlay ---------- */
.bg-gradient {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: 
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(124, 58, 237, 0.15), transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(6, 182, 212, 0.1), transparent 50%),
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(244, 114, 182, 0.08), transparent 50%),
    linear-gradient(180deg, var(--bg-gradient-1), var(--bg-gradient-2), var(--bg-gradient-3));
}

/* ---------- Animated Floating Orbs ---------- */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  z-index: -1;
  pointer-events: none;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.3), transparent 70%);
  top: -100px;
  left: -100px;
  animation: float-orb-1 20s ease-in-out infinite;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.25), transparent 70%);
  bottom: -50px;
  right: -50px;
  animation: float-orb-2 25s ease-in-out infinite;
}

.orb-3 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(244, 114, 182, 0.2), transparent 70%);
  top: 50%;
  left: 60%;
  animation: float-orb-3 18s ease-in-out infinite;
}

@keyframes float-orb-1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(80px, 60px) scale(1.1); }
  66% { transform: translate(-40px, 100px) scale(0.95); }
}

@keyframes float-orb-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-60px, -80px) scale(1.15); }
  66% { transform: translate(50px, -40px) scale(0.9); }
}

@keyframes float-orb-3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -50px) scale(1.05); }
  66% { transform: translate(-80px, 30px) scale(1.1); }
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 10, 26, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition-normal);
}

.navbar-logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.navbar-links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}

.navbar-links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  border-radius: var(--radius-full);
  transition: var(--transition-normal);
}

.navbar-links a:hover {
  color: var(--text-primary);
}

.navbar-links a:hover::after {
  width: 100%;
}

/* ---------- Section Utility ---------- */
.section {
  padding: var(--space-24) var(--space-8);
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-2);
  margin-bottom: var(--space-4);
  padding: var(--space-1) var(--space-4);
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-24) var(--space-8);
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--accent-2);
  padding: var(--space-2) var(--space-6);
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-8);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--accent-4);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: var(--font-size-6xl);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradient-shift 8s ease-in-out infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-description {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto var(--space-10);
  line-height: 1.8;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  animation: fadeInUp 0.8s ease-out 0.8s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: white;
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

.btn-discord {
  background: #5865F2;
  color: white;
  box-shadow: 0 4px 20px rgba(88, 101, 242, 0.3);
}

.btn-discord:hover {
  background: #4752C4;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(88, 101, 242, 0.4);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-10);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  animation: fadeInUp 0.8s ease-out 1.2s both;
}

.scroll-indicator .mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator .mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--text-muted);
  border-radius: var(--radius-full);
  animation: scroll-mouse 2s ease-in-out infinite;
}

@keyframes scroll-mouse {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.3; transform: translateX(-50%) translateY(10px); }
}

/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.glass-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* ---------- About Section ---------- */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-12);
  align-items: center;
  margin-top: var(--space-12);
}

.about-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-container {
  position: relative;
  width: 280px;
  height: 280px;
}

.avatar-ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent-1), var(--accent-2), var(--accent-3), var(--accent-4), var(--accent-1));
  animation: spin-slow 8s linear infinite;
  opacity: 0.6;
}

@keyframes spin-slow {
  to { transform: rotate(360deg); }
}

.avatar-inner {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  z-index: 1;
  overflow: hidden;
}

.avatar-inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.about-info h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.about-info p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.stat-item {
  text-align: center;
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.stat-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

/* ---------- Skills / Interests Section ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.skill-card {
  padding: var(--space-8);
}

.skill-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: var(--space-6);
  position: relative;
}

.skill-icon.purple {
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.skill-icon.cyan {
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.skill-icon.pink {
  background: rgba(244, 114, 182, 0.12);
  border: 1px solid rgba(244, 114, 182, 0.2);
}

.skill-icon.green {
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.2);
}

.skill-icon.amber {
  background: rgba(251, 191, 36, 0.12);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

.skill-icon.indigo {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.skill-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.skill-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-12) var(--space-8);
  border-top: 1px solid var(--glass-border);
  margin-top: var(--space-16);
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-link {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
  transition: var(--transition-normal);
}

.footer-link:hover {
  background: rgba(124, 58, 237, 0.15);
  border-color: rgba(124, 58, 237, 0.3);
  color: var(--text-primary);
  transform: translateY(-3px);
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .hero-description {
    font-size: var(--font-size-base);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .about-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .avatar-container {
    width: 200px;
    height: 200px;
  }

  .avatar-inner {
    font-size: 4rem;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-16) var(--space-4);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .navbar {
    padding: var(--space-3) var(--space-4);
  }

  .navbar-links {
    gap: var(--space-4);
  }

  .navbar-links a {
    font-size: var(--font-size-xs);
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .about-stats {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
}