/* ================================================================
   Design Tokens & CSS Variables
   ================================================================ */
:root {
  /* ===== Color Palette - 简约三色体系 ===== */
  --color-primary: #4f46e5;           /* Indigo 靛蓝 - 主强调色 */
  --color-primary-light: #6366f1;
  --color-primary-lighter: #eef2ff;
  --color-primary-dark: #4338ca;
  
  --color-accent: #14b8a6;            /* Teal 青色 - 次强调色 */
  --color-accent-light: #2dd4bf;
  --color-accent-lighter: #ccfbf1;
  --color-accent-dark: #0d9488;

  /* Neutral Colors - 中性色体系 */
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;      /* slate-50 */
  --color-bg-tertiary: #f1f5f9;       /* slate-100 */
  --color-bg-hover: #e2e8f0;          /* slate-200 */
  --color-bg-dark: #0f172a;           /* slate-900 */
  
  --color-border: #e2e8f0;            /* slate-200 */
  --color-border-light: #f1f5f9;      /* slate-100 */
  --color-border-dark: #cbd5e1;       /* slate-300 */
  
  --color-text: #1e293b;              /* slate-800 - 正文 */
  --color-text-secondary: #475569;    /* slate-600 - 次要文字 */
  --color-text-muted: #94a3b8;        /* slate-400 - 辅助文字 */
  --color-text-light: #f1f5f9;        /* 深色背景文字 */
  --color-white: #ffffff;

  /* ===== Typography ===== */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.5rem;    /* 40px */
  --font-size-5xl: 3.5rem;    /* 56px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;

  /* ===== Spacing Scale (8px base) ===== */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */

  /* ===== Sizing ===== */
  --container-max: 1280px;
  --container-narrow: 960px;
  --content-max: 720px;

  /* ===== Border Radius ===== */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;

  /* ===== Shadows - 分层阴影系统 ===== */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04), 0 1px 3px 0 rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.06);
  --shadow-2xl: 0 25px 50px -12px rgba(15, 23, 42, 0.12);
  --shadow-inner: inset 0 2px 4px 0 rgba(15, 23, 42, 0.03);
  
  /* Hover states - elevation */
  --shadow-card-hover: 0 20px 40px -15px rgba(79, 70, 229, 0.15), 0 10px 20px -10px rgba(15, 23, 42, 0.1);
  --shadow-navbar-scrolled: 0 4px 20px -4px rgba(15, 23, 42, 0.08), 0 1px 3px rgba(15, 23, 42, 0.04);

  /* ===== Transitions & Animations ===== */
  --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;
  
  --transition-fast: var(--duration-fast) var(--ease-out-quad);
  --transition-base: var(--duration-base) var(--ease-out-quad);
  --transition-slow: var(--duration-slow) var(--ease-out-expo);
  --transition-spring: var(--duration-slow) var(--ease-spring);

  /* ===== Z-Index Scale ===== */
  --z-base: 0;
  --z-above: 10;
  --z-dropdown: 50;
  --z-navbar: 100;
  --z-overlay: 500;
  --z-modal: 1000;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

::selection {
  background-color: var(--color-primary);
  color: var(--color-white);
}

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

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

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol { list-style: none; }

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: var(--z-modal);
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  width: auto;
  height: auto;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
}

/* ================================================================
   Layout Utilities
   ================================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 640px) {
  .container { padding: 0 var(--space-4); }
}

.lazy-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  opacity: 0;
}

.lazy-image.loaded {
  opacity: 1;
}

/* ================================================================
   Scroll Animations
   ================================================================ */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: 
    opacity var(--duration-slower) var(--ease-out-expo),
    transform var(--duration-slower) var(--ease-out-expo);
  will-change: opacity, transform;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children animations */
.animate-on-scroll.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: 
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

.animate-on-scroll.visible.stagger-children > * {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll.visible.stagger-children > *:nth-child(1) { transition-delay: 0ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(2) { transition-delay: 60ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(3) { transition-delay: 120ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(4) { transition-delay: 180ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(5) { transition-delay: 240ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(6) { transition-delay: 300ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(7) { transition-delay: 360ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(8) { transition-delay: 420ms; }
.animate-on-scroll.visible.stagger-children > *:nth-child(n+9) { transition-delay: 480ms; }

/* ================================================================
   Navbar / 顶部导航栏
   ================================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-navbar);
  background-color: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: 
    background-color var(--transition-base),
    box-shadow var(--transition-base),
    backdrop-filter var(--transition-base),
    padding var(--transition-base);
  padding: var(--space-4) 0;
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-navbar-scrolled);
  padding: var(--space-2) 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 640px) {
  .nav-container { padding: 0 var(--space-4); }
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
  border-radius: var(--radius-lg);
  transition: transform var(--transition-spring);
}

.logo-icon svg { width: 20px; height: 20px; }

.nav-logo:hover .logo-icon {
  transform: rotate(-10deg) scale(1.05);
}

.logo-text {
  font-size: var(--font-size-xl);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.logo-accent {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Desktop Nav Menu */
.nav-menu {
  display: none;
}

@media (min-width: 1024px) {
  .nav-menu { display: block; }
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: 
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-tertiary);
}

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

.nav-link.active::after {
  width: 24px;
}

/* Search Box */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.search-box {
  display: none;
  position: relative;
  align-items: center;
}

@media (min-width: 768px) {
  .search-box { display: flex; }
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
  transition: color var(--transition-fast);
}

.search-input {
  width: 240px;
  padding: var(--space-2) var(--space-10) var(--space-2) var(--space-10);
  background-color: var(--color-bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  transition: 
    width var(--transition-base),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-input:hover {
  background-color: var(--color-bg-hover);
}

.search-input:focus {
  outline: none;
  width: 300px;
  background-color: var(--color-white);
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-input:focus + .search-icon {
  color: var(--color-primary);
}

.search-clear {
  position: absolute;
  right: var(--space-2);
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: 
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.search-clear svg { width: 16px; height: 16px; }

.search-clear:hover {
  color: var(--color-text-secondary);
  background-color: var(--color-bg-hover);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-bg-tertiary);
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: 
    transform var(--transition-base),
    opacity var(--transition-fast);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 1024px) {
  .mobile-menu-toggle { display: none; }
}

/* Mobile Menu */
.mobile-menu {
  padding: 0 var(--space-6) var(--space-4);
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border-light);
  animation: slideDown var(--transition-base);
}

@media (max-width: 640px) {
  .mobile-menu { padding: 0 var(--space-4) var(--space-4); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-top: var(--space-2);
}

.mobile-nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: 
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-tertiary);
}

.mobile-nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-lighter);
}

/* ================================================================
   Hero Section / 个人简介区域
   ================================================================ */
.hero {
  position: relative;
  padding-top: calc(96px + var(--space-16));
  padding-bottom: var(--space-20);
  overflow: hidden;
}

.hero-bg-decoration {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(79, 70, 229, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 70, 229, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at top, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 30%, transparent 70%);
}

.hero-bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: blobFloat 20s ease-in-out infinite;
}

.hero-bg-blob.blob-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.2), transparent 70%);
  top: -200px;
  left: -150px;
}

.hero-bg-blob.blob-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.2), transparent 70%);
  top: 100px;
  right: -100px;
  animation-delay: -5s;
  animation-duration: 25s;
}

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.1); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}

.hero-container {
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-12);
  align-items: center;
}

@media (max-width: 960px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    text-align: center;
    justify-items: center;
  }
}

/* Avatar */
.hero-avatar-wrapper {
  position: relative;
  flex-shrink: 0;
}

.hero-avatar-ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--color-primary), var(--color-accent), var(--color-primary));
  animation: rotate 8s linear infinite;
  z-index: 0;
  opacity: 0.8;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.hero-avatar {
  position: relative;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-bg-tertiary);
  border: 4px solid var(--color-white);
  box-shadow: var(--shadow-xl);
  z-index: 1;
}

@media (max-width: 640px) {
  .hero-avatar {
    width: 160px;
    height: 160px;
  }
}

.hero-status-indicator {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 20px;
  height: 20px;
  background: #10b981;
  border: 3px solid var(--color-white);
  border-radius: 50%;
  z-index: 2;
  box-shadow: var(--shadow-md);
}

.hero-status-indicator::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.3);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0; }
}

/* Hero Text */
.hero-greeting {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.wave-hand {
  display: inline-block;
  transform-origin: 70% 70%;
  animation: wave 2.5s ease-in-out infinite;
}

@keyframes wave {
  0%, 60%, 100% { transform: rotate(0); }
  10%, 30% { transform: rotate(14deg); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(-4deg); }
  50% { transform: rotate(10deg); }
}

.hero-name {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.03em;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-5);
}

.hero-pronouns {
  font-size: 0.5em;
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

@media (max-width: 960px) {
  .hero-tags { justify-content: center; }
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  transition: transform var(--transition-spring);
}

.hero-tag svg { width: 16px; height: 16px; }

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

.tag-primary {
  background-color: var(--color-primary-lighter);
  color: var(--color-primary-dark);
}

.tag-secondary {
  background-color: var(--color-accent-lighter);
  color: var(--color-accent-dark);
}

.tag-tertiary {
  background-color: #fef3c7;
  color: #92400e;
}

.hero-bio {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-8);
}

@media (max-width: 960px) {
  .hero-bio { margin-left: auto; margin-right: auto; }
}

.accent-text {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-10);
}

@media (max-width: 960px) {
  .hero-actions { justify-content: center; }
}

/* Stats */
.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .hero-stats { justify-content: center; }
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

@media (max-width: 960px) {
  .stat-item { align-items: center; }
}

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-medium);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background-color: var(--color-border);
}

@media (max-width: 480px) {
  .stat-divider { display: none; }
}

/* ================================================================
   Buttons
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1.5;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: 
    all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-xs);
  border-radius: var(--radius-md);
}

.btn-sm svg {
  width: 14px;
  height: 14px;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
  box-shadow: 0 4px 14px -4px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -4px rgba(79, 70, 229, 0.5);
}

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

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-text);
  border-color: var(--color-border-dark);
}

.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-primary);
  border-color: var(--color-border-dark);
}

/* ================================================================
   Main Layout / 主内容布局
   ================================================================ */
.main-layout {
  padding: var(--space-8) 0 var(--space-20);
}

.main-container {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-10);
  align-items: start;
}

@media (max-width: 1100px) {
  .main-container {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

/* ================================================================
   Section Headers
   ================================================================ */
.section-header {
  margin-bottom: var(--space-8);
}

.section-header-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

.section-title {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.section-title-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-lighter), var(--color-accent-lighter));
  color: var(--color-primary);
  border-radius: var(--radius-lg);
}

.section-title-icon svg {
  width: 22px;
  height: 22px;
}

.section-count {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

.section-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-left: 52px;
}

@media (max-width: 640px) {
  .section-title { font-size: var(--font-size-2xl); }
  .section-subtitle { margin-left: 0; }
}

/* ================================================================
   Filter Bar / 筛选栏
   ================================================================ */
.filter-bar {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-sm);
}

.filter-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.filter-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: 
    all var(--transition-fast);
}

.filter-chip:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
  border-color: var(--color-border-dark);
}

.filter-chip.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
  border-color: transparent;
  box-shadow: 0 4px 12px -2px rgba(79, 70, 229, 0.35);
}

/* ================================================================
   Search Status
   ================================================================ */
.search-status {
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-6);
  background-color: var(--color-primary-lighter);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-medium);
}

/* ================================================================
   Articles Grid / 文章卡片网格
   ================================================================ */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

/* Article Card / 文章卡片 */
.article-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: 
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
  position: relative;
}

.article-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 2px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-mask: 
    linear-gradient(#fff 0 0) content-box, 
    linear-gradient(#fff 0 0);
  mask: 
    linear-gradient(#fff 0 0) content-box, 
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.article-card:hover::before {
  opacity: 1;
}

.article-card:hover .article-cover img {
  transform: scale(1.05);
}

@media (max-width: 640px) {
  .article-card {
    grid-template-columns: 1fr;
  }
}

.article-cover {
  position: relative;
  overflow: hidden;
  background-color: var(--color-bg-tertiary);
  aspect-ratio: 4 / 3;
}

@media (max-width: 640px) {
  .article-cover {
    aspect-ratio: 16 / 9;
    min-height: 180px;
  }
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slower) var(--ease-out-expo);
}

.article-category-badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-full);
  z-index: 1;
}

.article-content {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  gap: var(--space-3);
  min-height: 0;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.article-meta-item svg {
  width: 14px;
  height: 14px;
}

.article-dot-sep {
  width: 3px;
  height: 3px;
  background-color: var(--color-text-muted);
  border-radius: 50%;
}

.article-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.01em;
  line-height: var(--line-height-snug);
  color: var(--color-text);
  transition: color var(--transition-fast);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card:hover .article-title {
  color: var(--color-primary);
}

.article-summary {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-2);
  flex-wrap: wrap;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary-dark);
  background-color: var(--color-primary-lighter);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: 
    all var(--transition-fast);
}

.tag:hover,
.tag.active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.tag.tag-accent {
  color: var(--color-accent-dark);
  background-color: var(--color-accent-lighter);
}

.tag.tag-accent:hover,
.tag.tag-accent.active {
  background-color: var(--color-accent);
  color: white;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  transition: gap var(--transition-fast);
  flex-shrink: 0;
}

.article-read-more svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.article-card:hover .article-read-more {
  gap: var(--space-2);
}

.article-card:hover .article-read-more svg {
  transform: translateX(3px);
}

/* ================================================================
   Empty State / 空状态
   ================================================================ */
.empty-state {
  text-align: center;
  padding: var(--space-20) var(--space-6);
  background-color: var(--color-white);
  border: 1px dashed var(--color-border-dark);
  border-radius: var(--radius-xl);
}

.empty-state-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-5);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background-color: var(--color-bg-secondary);
  border-radius: 50%;
}

.empty-state-icon svg {
  width: 40px;
  height: 40px;
}

.empty-state-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.empty-state-desc {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

/* ================================================================
   Load More
   ================================================================ */
.load-more-wrapper {
  text-align: center;
  margin-top: var(--space-10);
}

/* ================================================================
   Sidebar / 侧边栏
   ================================================================ */
.sidebar {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

@media (max-width: 1100px) {
  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

.sidebar-widget {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.sidebar-widget:hover {
  box-shadow: var(--shadow-md);
}

.widget-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
}

.widget-title svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

/* Popular Articles */
.popular-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.popular-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.popular-item:hover {
  background-color: var(--color-bg-secondary);
}

.popular-rank {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

.popular-item:nth-child(1) .popular-rank {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: white;
}
.popular-item:nth-child(2) .popular-rank {
  background: linear-gradient(135deg, #9ca3af, #6b7280);
  color: white;
}
.popular-item:nth-child(3) .popular-rank {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: white;
}

.popular-content {
  min-width: 0;
  flex-grow: 1;
}

.popular-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  line-height: var(--line-height-snug);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-1);
  transition: color var(--transition-fast);
}

.popular-item:hover .popular-title {
  color: var(--color-primary);
}

.popular-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.popular-views {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

.popular-views svg {
  width: 12px;
  height: 12px;
}

/* Category List */
.category-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: 
    all var(--transition-fast);
  gap: var(--space-3);
}

.category-item:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
}

.category-item.active {
  background-color: var(--color-primary-lighter);
  color: var(--color-primary-dark);
}

.category-name {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.category-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.category-count {
  flex-shrink: 0;
  padding: 2px var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}

.category-item:hover .category-count,
.category-item.active .category-count {
  background-color: rgba(79, 70, 229, 0.15);
  color: var(--color-primary);
}

/* Tag Cloud */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag-cloud .tag {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
}

/* Author Card */
.widget-author {
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-primary-lighter) 100%);
  border-color: rgba(79, 70, 229, 0.15);
}

.author-card {
  text-align: center;
}

.author-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto var(--space-4);
  border: 3px solid var(--color-white);
  box-shadow: var(--shadow-lg);
  background-color: var(--color-bg-tertiary);
}

.author-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.author-role {
  font-size: var(--font-size-sm);
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-3);
}

.author-quote {
  font-size: var(--font-size-sm);
  font-style: italic;
  color: var(--color-text-secondary);
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid rgba(79, 70, 229, 0.1);
  border-bottom: 1px solid rgba(79, 70, 229, 0.1);
  margin-bottom: var(--space-4);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.social-link {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: 
    all var(--transition-base);
}

.social-link svg {
  width: 18px;
  height: 18px;
}

.social-link:hover {
  transform: translateY(-2px);
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  box-shadow: 0 6px 16px -4px rgba(79, 70, 229, 0.4);
}

/* ================================================================
   Footer / 页脚
   ================================================================ */
.footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-accent), transparent);
  opacity: 0.5;
}

.footer-container {
  position: relative;
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* Footer Brand */
.footer-logo {
  margin-bottom: var(--space-4);
  display: inline-flex;
}

.footer-logo .logo-text {
  color: var(--color-white);
}

.footer-tagline {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: rgba(241, 245, 249, 0.6);
  max-width: 320px;
  margin-bottom: var(--space-6);
}

.footer-social {
  display: flex;
  gap: var(--space-2);
}

.social-link-light {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  color: rgba(241, 245, 249, 0.7);
}

.social-link-light:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Footer Columns */
.footer-col-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-5);
  letter-spacing: 0.02em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: rgba(241, 245, 249, 0.6);
  transition: 
    color var(--transition-fast),
    transform var(--transition-fast);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--color-white);
  transform: translateX(4px);
}

/* Newsletter */
.footer-newsletter-desc {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: rgba(241, 245, 249, 0.6);
  margin-bottom: var(--space-4);
}

.footer-newsletter-form .form-row {
  display: flex;
  gap: var(--space-2);
}

.footer-newsletter-form input[type="email"] {
  flex-grow: 1;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-white);
  transition: 
    border-color var(--transition-fast),
    background-color var(--transition-fast);
  min-width: 0;
}

.footer-newsletter-form input[type="email"]::placeholder {
  color: rgba(241, 245, 249, 0.4);
}

.footer-newsletter-form input[type="email"]:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: rgba(255, 255, 255, 0.08);
}

.form-success {
  margin-top: var(--space-3);
  font-size: var(--font-size-xs);
  color: var(--color-accent-light);
  font-weight: var(--font-weight-medium);
}

/* Footer Bottom */
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
}

.copyright {
  font-size: var(--font-size-xs);
  color: rgba(241, 245, 249, 0.4);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.copyright-sep {
  opacity: 0.5;
}

.heart {
  color: #ef4444;
  display: inline-block;
  animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  15% { transform: scale(1.2); }
  30% { transform: scale(1); }
  45% { transform: scale(1.15); }
}

.coffee {
  display: inline-block;
}

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer-bottom-links a {
  font-size: var(--font-size-xs);
  color: rgba(241, 245, 249, 0.4);
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: rgba(241, 245, 249, 0.8);
}

/* ================================================================
   Back to Top / 回到顶部
   ================================================================ */
.back-to-top {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 24px -4px rgba(79, 70, 229, 0.45);
  z-index: var(--z-above);
  transition: 
    all var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

.back-to-top:not([hidden]) {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px -4px rgba(79, 70, 229, 0.55);
}

.back-to-top:active {
  transform: translateY(0);
}

@media (max-width: 640px) {
  .back-to-top {
    right: var(--space-4);
    bottom: var(--space-4);
    width: 44px;
    height: 44px;
  }
}