/* ==========================================================================
   Design System & Premium Stylesheet - Masaya Takagi Portfolio
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- Theme Tokens (Variables) --- */
:root {
  /* Font Family */
  --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* 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);
  --transition-bounce: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --spacing-xxl: 6rem;
  
  /* Shadow & Blur */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.2);
  --glass-blur: 12px;
}

/* --- Dark Theme (Default) --- */
html, html.dark {
  --bg-primary: #0b0f19;
  --bg-secondary: #131a2c;
  --bg-tertiary: #1b253f;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-primary: #00d2ff;
  --accent-secondary: #b55fe6;
  --accent-gradient: linear-gradient(135deg, #00d2ff 0%, #b55fe6 100%);
  --accent-gradient-hover: linear-gradient(135deg, #00e1ff 0%, #c476f5 100%);
  
  --border-color: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(19, 26, 44, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  
  --card-bg: #131a2c;
  --card-hover-bg: #1b253f;
  
  --scroll-bar: #1e293b;
  --scroll-thumb: #334155;
  color-scheme: dark;
}

/* --- Light Theme --- */
html.light {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-primary: #0284c7;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #8b5cf6 100%);
  --accent-gradient-hover: linear-gradient(135deg, #0369a1 0%, #7c3aed 100%);
  
  --border-color: rgba(0, 0, 0, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-shadow: rgba(15, 23, 42, 0.08);
  
  --card-bg: #ffffff;
  --card-hover-bg: #f1f5f9;
  
  --scroll-bar: #e2e8f0;
  --scroll-thumb: #cbd5e1;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  height: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

button, input, textarea, select {
  font-family: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--scroll-bar);
}
::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* --- Layout Components --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

main {
  flex-grow: 1;
  padding-top: 80px; /* Prevent overlap with fixed header */
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background-color: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), height var(--transition-normal);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover {
  color: var(--accent-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link.active {
  color: var(--accent-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Theme Toggle Button */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle:hover {
  transform: scale(1.05);
  background-color: var(--card-hover-bg);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* Light theme shows sun icon, Dark theme shows moon icon */
html.light .theme-toggle .icon-moon,
html.dark .theme-toggle .icon-sun {
  display: none;
}
html.light .theme-toggle .icon-sun,
html.dark .theme-toggle .icon-moon {
  display: block;
}

/* Scroll Progress Bar */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent-gradient);
  z-index: 1001;
}

/* Hamburger Menu Button (Mobile) */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1002;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.menu-toggle.is-open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Nav Menu Drawer */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 300px;
  height: 100vh;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: 6rem 2rem 2rem 2rem;
  z-index: 999;
  transition: right var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-lg);
}

.mobile-menu.open {
  right: 0;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-nav-link {
  font-size: 1.25rem;
  font-weight: 600;
  display: block;
  padding: 0.5rem 0;
}

.mobile-nav-link.active {
  color: var(--accent-primary);
  border-left: 3px solid var(--accent-primary);
  padding-left: 0.75rem;
}

/* --- Footer --- */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: background-color var(--transition-normal);
  margin-top: auto;
}

/* --- Section Layouts --- */
.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40px;
  height: 4px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
  max-width: 700px;
}

/* --- Hero Section --- */
.hero {
  min-height: calc(85vh - 80px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
  position: relative;
  overflow: hidden;
}

/* Background glowing blob effect */
.hero::before {
  content: '';
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 210, 255, 0.08) 0%, rgba(181, 95, 230, 0.05) 50%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.hero-tag {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--spacing-sm);
}

.hero-name {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: var(--spacing-sm);
}

.hero-title {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  max-width: 800px;
  margin-bottom: var(--spacing-lg);
}

.hero-title span {
  color: var(--text-primary);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

/* --- Strengths Card Layout --- */
.strengths-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.strength-card {
  padding: var(--spacing-lg);
}

.strength-num {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.strength-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.strength-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- Project Grid (Home / Projects page) --- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card-header {
  margin-bottom: var(--spacing-sm);
}

.project-category {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.project-card h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin: var(--spacing-xs) 0;
}

.project-card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.project-meta-list {
  list-style: none;
  font-size: 0.85rem;
  margin-bottom: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-sm);
}

.project-meta-item {
  display: flex;
  margin-bottom: 4px;
}

.project-meta-label {
  font-weight: 600;
  color: var(--text-primary);
  width: 80px;
  flex-shrink: 0;
}

.project-meta-val {
  color: var(--text-secondary);
}

/* --- Timeline (Profile page) --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: var(--spacing-lg) auto 0 auto;
  padding-left: var(--spacing-lg);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 5px;
  bottom: 5px;
  width: 2px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.timeline-dot {
  position: absolute;
  left: -29px;
  top: 5px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 4px solid var(--accent-primary);
  z-index: 2;
  transition: border-color var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
  border-color: var(--accent-secondary);
}

.timeline-date {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-xs);
}

.timeline-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.timeline-subtitle {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.timeline-body {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.timeline-body ul {
  list-style-type: none;
  margin-top: var(--spacing-xs);
}

.timeline-body li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 4px;
}

.timeline-body li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* --- Tech Stack Badges Grid --- */
.tech-category {
  margin-bottom: var(--spacing-lg);
}

.tech-category-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--spacing-xs);
}

/* --- Contact Form (Contact page) --- */
.contact-container {
  max-width: 600px;
  margin: var(--spacing-lg) auto 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--accent-primary);
  background-color: var(--bg-secondary);
}

textarea.form-control {
  resize: vertical;
  min-height: 150px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.social-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-icon:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-3px);
}

.social-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* --- Common UI Components --- */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition-fast), filter var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(0, 210, 255, 0.25);
}

.btn-primary:hover {
  background: var(--accent-gradient-hover);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--card-hover-bg);
}

/* Cards */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
  background-color: var(--card-hover-bg);
}

/* Glassmorphism Panel */
.glass-panel {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-radius: 20px;
  padding: var(--spacing-lg);
  box-shadow: 0 8px 32px var(--glass-shadow);
}

/* Tags & Badges */
.tag-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.tag:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Stats Counter */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.stat-card {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
}

.stat-number {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 3rem;
  line-height: 1;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--spacing-xs);
  display: block;
}

.stat-label {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.stat-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Scroll Top Button */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal);
  z-index: 99;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
}

/* --- Reveal (Scroll Animation) --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* Delay modifiers for stagger effects */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* --- Responsive Utilities --- */
@media (max-width: 992px) {
  .nav-links {
    display: none; /* Hide PC links */
  }
  .menu-toggle {
    display: flex; /* Show Hamburger */
  }
  .hero-name {
    font-size: 3rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  .section {
    padding: var(--spacing-lg) 0;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
  }
  .timeline {
    padding-left: var(--spacing-md);
  }
  .timeline::before {
    left: 4px;
  }
  .timeline-dot {
    left: -20px;
    width: 10px;
    height: 10px;
    border-width: 2px;
  }
}

/* --- Three.js Background Canvas Styles --- */
#canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(circle at center, #111827 0%, #030712 100%);
  transition: background var(--transition-normal);
}

/* Light theme support for background canvas */
html.light #canvas-container {
  background: radial-gradient(circle at center, #f8fafc 0%, #cbd5e1 100%);
}

/* Clear default body backgrounds to show the canvas */
body, 
html.dark body, 
html.light body {
  background: transparent !important;
  background-color: transparent !important;
}

/* --- Konami Code Easter Egg Styles --- */
.konami-perspective {
  perspective: 1500px;
  perspective-origin: center 30%;
}

.konami-spin {
  animation: konami3DFlip 2s cubic-bezier(0.25, 1, 0.5, 1) forwards;
  transform-style: preserve-3d;
}

@keyframes konami3DFlip {
  0% {
    transform: rotateY(0deg) scale(1);
    filter: brightness(1);
  }
  50% {
    transform: rotateY(180deg) scale(0.85);
    filter: brightness(0.7);
  }
  100% {
    transform: rotateY(360deg) scale(1);
    filter: brightness(1);
  }
}

/* --- Accessibility & SEO Utilities --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}