/* ==========================================================================
   Design System & Reset (Monochrome Hybrid Theme)
   ========================================================================== */
:root {
  /* Color Palette - Dark Glass Base */
  --bg-primary: #090d16;
  --bg-glass: rgba(15, 23, 42, 0.65);
  --bg-glass-card: rgba(30, 41, 59, 0.55);
  --bg-glass-hover: rgba(51, 65, 85, 0.65);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-glass-bright: rgba(255, 255, 255, 0.25);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  
  /* Grayscale & Monochromatic Accent Colors */
  --accent-cyan: #e2e8f0;          /* Platinum White / Light Silver */
  --accent-emerald: #cbd5e1;       /* Cool Silver */
  --accent-purple: #94a3b8;        /* Medium Slate Silver */
  --gradient-primary: linear-gradient(135deg, #ffffff 0%, #e2e8f0 40%, #94a3b8 100%);
  --gradient-glow: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(203, 213, 225, 0.12) 100%);
  
  /* Fonts & Shadows */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 15px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 0 25px rgba(255, 255, 255, 0.3);

  /* Layout */
  --nav-height: 76px;
  --container-max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  color-scheme: dark;
}

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

/* ==========================================================================
   Background Canvas Container
   ========================================================================== */
#canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* Base Container & Page Main Layout */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-main {
  flex: 1;
  padding-top: var(--nav-height);
  display: flex;
  flex-direction: column;
}

section {
  padding: 2rem 0 3.5rem;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 2rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Glassmorphism Card Utility */
.glass-card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-glass-bright);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.6), 0 0 20px rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding-right: 4.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: color var(--transition-fast), transform var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  outline: none;
}

.nav-link:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.nav-link i {
  font-size: 0.95rem;
  transition: transform var(--transition-fast);
}

.nav-link:hover i,
.nav-link.active i {
  transform: translateY(-2px);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-main);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ==========================================================================
   Tab Panel Switcher System
   ========================================================================== */
.tab-panel:not(.active) {
  display: none !important;
}

.tab-panel.active {
  animation: tabFadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero.tab-panel.active {
  display: flex !important;
}

.about.tab-panel.active,
.skills.tab-panel.active {
  display: block !important;
}

@keyframes tabFadeIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Art Control Buttons (Zen Mode & Redraw Buttons)
   ========================================================================== */
.art-control-btn {
  position: fixed;
  top: 1rem;
  z-index: 1200;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass-bright);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all var(--transition-normal);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.art-control-btn:hover {
  background: #ffffff;
  color: #000000;
  transform: scale(1.1);
  box-shadow: var(--shadow-glow);
}

/* Zen Toggle Button (Rightmost) */
.zen-toggle-btn {
  right: 1.25rem;
}

/* Redraw Art Button (Middle) */
.redraw-art-btn {
  right: calc(1.25rem + 44px + 10px);
}

.redraw-art-btn i {
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.redraw-art-btn.is-spinning i {
  transform: rotate(360deg);
}

/* Wireframe Toggle Button (Left of Redraw button) */
.wireframe-toggle-btn {
  right: calc(1.25rem + (44px + 10px) * 2);
}

.wireframe-toggle-btn.is-active {
  background: #ffffff;
  color: #000000;
  border-color: #ffffff;
  box-shadow: var(--shadow-glow);
}

body.zen-mode .header,
body.zen-mode main,
body.zen-mode .footer {
  opacity: 0 !important;
  pointer-events: none !important;
  visibility: hidden !important;
}

body.zen-mode .art-control-btn {
  background: rgba(255, 255, 255, 0.25);
  border-color: #ffffff;
  color: #ffffff;
}

body.zen-mode .wireframe-toggle-btn.is-active {
  background: #ffffff;
  color: #000000;
}

/* Wireframe Mode Styling (White Background / Monochrome Adaptation) */
body.wireframe-mode {
  --bg-primary: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #334155;
  --border-glass: rgba(0, 0, 0, 0.15);
  --border-glass-bright: rgba(0, 0, 0, 0.35);
  --bg-glass-card: rgba(255, 255, 255, 0.88);
  --bg-glass-hover: rgba(241, 245, 249, 0.95);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.15), 0 0 15px rgba(0, 0, 0, 0.05);
}

body.wireframe-mode .header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
}

body.wireframe-mode .nav-link {
  color: #475569;
}

body.wireframe-mode .nav-link:hover,
body.wireframe-mode .nav-link.active {
  color: #000000;
}

body.wireframe-mode .nav-link::after {
  background: #000000;
}

body.wireframe-mode .gradient-text {
  background: linear-gradient(135deg, #000000 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.wireframe-mode .art-control-btn {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(0, 0, 0, 0.25);
  color: #000000;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

body.wireframe-mode .art-control-btn:hover {
  background: #000000;
  color: #ffffff;
  border-color: #000000;
}

body.wireframe-mode .wireframe-toggle-btn.is-active {
  background: #000000;
  color: #ffffff;
  border-color: #000000;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

body.wireframe-mode .hobby-tag {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.18);
  color: #1e293b;
}

body.wireframe-mode .hobby-tag:hover {
  background: #000000;
  color: #ffffff;
}

body.wireframe-mode .hobby-action-link {
  color: #000000;
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.35);
}

body.wireframe-mode .hobby-action-link i {
  color: #000000;
}

body.wireframe-mode .hobby-action-link:hover {
  background: #000000;
  color: #ffffff;
  border-color: #000000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

body.wireframe-mode .hobby-action-link:hover i {
  color: #ffffff;
}

/* ==========================================================================
   Hero Section - Fullscreen
   ========================================================================== */
.hero {
  min-height: calc(100vh - var(--nav-height) - 4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 0 2rem;
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
  width: 100%;
}

.hero-text {
  z-index: 2;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

/* Hero Bio Glass Card Block */
.hero-bio-block {
  padding: 1.5rem 1.75rem;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-bio-block p {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.7;
}

.hero-social {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

.social-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.social-links {
  display: flex;
  gap: 0.8rem;
}

.social-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.social-icon:hover {
  background: var(--gradient-primary);
  color: #000000;
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.hero-avatar-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-card {
  position: relative;
  padding: 1.5rem;
  width: 100%;
  max-width: 360px;
  text-align: center;
}

.avatar-img-container {
  display: block;
  width: 180px;
  height: 180px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  padding: 4px;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-glow);
  overflow: hidden;
  text-decoration: none;
  cursor: pointer;
}

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

.avatar-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
}

.avatar-role {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
}

.scroll-indicator:hover {
  color: #ffffff;
  transform: translateX(-50%) translateY(-2px);
}

.scroll-indicator i {
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(8px); }
  60% { transform: translateY(4px); }
}

/* ==========================================================================
   Hobbies & Skills Section (Tab Panels)
   ========================================================================== */
.about,
.skills {
  padding-top: 1.5rem;
  padding-bottom: 3rem;
}

.skills-part {
  margin-top: 0;
}

.about-hobby-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.65;
  flex-grow: 1;
}

/* Hobby Hashtag Highlights */
.hobby-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.hobby-tag {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-full);
  color: var(--text-main);
  transition: all var(--transition-fast);
  line-height: 1.4;
}

.hobby-tag:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.45);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
}

/* Hobby Card Link Button (YouTube Playlist, Released Site, etc.) */
.feature-action {
  margin: 0.9rem 0 0.4rem;
}

.hobby-action-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 0.95rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.hobby-action-link .external-icon {
  font-size: 0.72rem;
  opacity: 0.75;
}

/* Playlist Variant (Red) */
.hobby-playlist-link {
  color: #ff5555;
  background: rgba(255, 50, 50, 0.08);
  border: 1px solid rgba(255, 70, 70, 0.32);
}

.hobby-playlist-link i.fa-youtube {
  font-size: 1.05rem;
  color: #ff0000;
  transition: transform var(--transition-fast);
}

.hobby-playlist-link:hover {
  background: rgba(255, 0, 0, 0.22);
  border-color: rgba(255, 80, 80, 0.65);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 0, 0, 0.28);
}

.hobby-playlist-link:hover i.fa-youtube {
  transform: scale(1.18);
}

/* Released Site Variant (Cyan / Generative Space Studio) */
.hobby-site-link {
  color: #00e5ff;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.32);
}

.hobby-site-link i.fa-rocket {
  font-size: 0.95rem;
  color: #00e5ff;
  transition: transform var(--transition-fast);
}

.hobby-site-link:hover {
  background: rgba(0, 229, 255, 0.22);
  border-color: rgba(0, 229, 255, 0.65);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 229, 255, 0.28);
}

.hobby-site-link:hover i.fa-rocket {
  transform: scale(1.18);
}

/* ==========================================================================
   Simplified Skills & Official Colored Icon Badges
   ========================================================================== */
.skills-subpart {
  margin-top: 5rem;
}

.skills-icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1.5rem;
}

.skill-badge-card {
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  text-align: center;
  transition: transform var(--transition-normal), border-color var(--transition-normal), background var(--transition-normal);
}

.skill-badge-card:hover {
  transform: translateY(-5px);
  background: rgba(51, 65, 85, 0.65);
  border-color: rgba(255, 255, 255, 0.35);
}

.skill-badge-icon {
  font-size: 2.8rem;
  display: inline-block;
  line-height: 1;
}

.skill-badge-text {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

/* ==========================================================================
   Certifications Section
   ========================================================================== */
.cert-subpart {
  margin-top: 2.5rem;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.cert-card {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.cert-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.3);
}

.cert-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.cert-info {
  display: flex;
  flex-direction: column;
}

.cert-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 0.3rem;
}

.cert-date {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* Footer & Footer Social Links */
.footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-glass);
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: auto;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.footer-social-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.footer-social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.footer-social-icon:hover {
  background: var(--gradient-primary);
  color: #000000;
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* Animations for Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Responsive Styles */
@media (max-width: 992px) {
  .hero-title { font-size: 3.5rem; }
  .hero-content { grid-template-columns: 1fr; text-align: center; }
  .hero-bio-block { margin-left: auto; margin-right: auto; }
  .hero-social { justify-content: center; }
  .about-hobby-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: calc(100vh - var(--nav-height));
    background: rgba(9, 13, 22, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 3rem 2rem;
    gap: 1.5rem;
    transition: right var(--transition-normal);
    border-left: 1px solid var(--border-glass);
  }

  .nav-links.active {
    right: 0;
  }

  .menu-toggle {
    display: block;
  }

  .art-control-btn {
    top: 0.85rem;
    width: 38px;
    height: 38px;
    font-size: 0.9rem;
  }

  .zen-toggle-btn {
    right: 0.85rem;
  }

  .redraw-art-btn {
    right: calc(0.85rem + 38px + 7px);
  }

  .wireframe-toggle-btn {
    right: calc(0.85rem + (38px + 7px) * 2);
  }

  .nav-container {
    padding-right: 8.8rem;
  }

  .skills-icon-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
}