:root {
  --bg-color: #fbfbfd;
  --text-color: #1d1d1f;
  --text-secondary: #86868b;
  --accent-color: #0066cc;
  --card-bg: #ffffff;
  --border-color: rgba(0, 0, 0, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition-fast: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000000;
    --text-color: #f5f5f7;
    --text-secondary: #86868b;
    --accent-color: #2997ff;
    --card-bg: #1c1c1e;
    --border-color: rgba(255, 255, 255, 0.12);
    --glass-bg: rgba(0, 0, 0, 0.65);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 21px;
  /* Increased base size for sleek readability */
  font-weight: 400;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a::after {
  content: '';
  position: absolute;
  width: 100%;
  transform: scaleX(0);
  height: 2px;
  bottom: -2px;
  left: 0;
  background-color: var(--accent-color);
  transform-origin: bottom right;
  transition: transform 0.3s cubic-bezier(0.86, 0, 0.07, 1);
}

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

a:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5em;
  letter-spacing: -0.015em;
}

h1 {
  font-size: 72px;
  /* Massive hero type */
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-top: 2em;
  margin-bottom: 0.2em;
}

h2 {
  font-size: 40px;
  /* Stronger section headers */
  line-height: 1.15;
  margin-top: 1.5em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border-color);
}

h3 {
  font-size: 20px;
  margin-top: 1.5em;
}

p {
  margin-bottom: 1.2em;
}

ul,
ol {
  margin-bottom: 1.2em;
  padding-left: 0;
  list-style-type: none;
}

li {
  margin-bottom: 0.8em;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 32px;
  padding-bottom: 160px;
}

section {
  margin-bottom: 15vh;
  /* Dramatic vertical spacing */
  opacity: 1;
  /* Reset for GSAP */
}

blockquote {
  font-size: 21px;
  font-style: italic;
  font-weight: 500;
  color: var(--text-secondary);
  border-left: 4px solid var(--accent-color);
  padding-left: 1.2em;
  margin: 2.5em 0;
}

blockquote footer {
  display: block;
  font-size: 14px;
  margin-top: 0.8em;
  font-style: normal;
  color: var(--text-secondary);
}

.subtitle {
  font-size: 21px;
  color: var(--text-secondary);
  margin-bottom: 2em;
  font-weight: 500;
}

.sidenote {
  display: inline-block;
  font-size: 13px;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: var(--radius-md);
  margin: 4px 4px 0 0;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  vertical-align: middle;
  line-height: 1.3;
}

.sidenote a {
  color: var(--accent-color);
}

.margin-toggle,
.sidenote-number {
  display: none;
}

.card {
  background-color: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform, opacity;
}

.card:hover {
  transform: translateY(-8px) scale(1.01);
  /* Magnetic pop effect */
  box-shadow: var(--shadow-md);
}

.card-title {
  font-weight: 600;
  display: block;
  margin-bottom: 12px;
  font-size: 24px;
}

.card p:last-child {
  margin-bottom: 0;
}

img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.2em;
  border: 1px solid var(--border-color);
}

.footer {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  padding: 14px 28px;
  border-radius: 40px;
  box-shadow: var(--shadow-md), 0 0 0 1px var(--border-color);
  display: flex;
  gap: 24px;
  align-items: center;
  z-index: 100;
  animation: floatIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translate(-50%, 20px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

.footer a {
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.6;
  transition: opacity 0.3s ease, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  will-change: transform;
}

.footer a::after {
  display: none;
  /* Remove underline animation for footer icons */
}

.footer a:hover {
  opacity: 1;
  transform: scale(1.2) translateY(-4px);
  /* Magnetic spring effect */
  text-decoration: none;
}

/* Header & Navigation */
site-header {
  display: block;
  position: sticky;
  top: 0;
  z-index: 200;
}

.header {
  padding: 16px 24px;
  background-color: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  animation: slideDown 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.nav-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--text-color);
}

.nav-logo::after {
  display: none;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-item {
  font-size: 15px;
  font-weight: 500;
  opacity: 0.6;
  transition: opacity 0.3s ease, color 0.3s ease;
}

.nav-item::after {
  display: none;
}

.nav-item:hover {
  opacity: 1;
  color: var(--text-color);
}

.nav-accent {
  background-color: var(--text-color);
  color: var(--bg-color);
  padding: 8px 16px;
  border-radius: 20px;
  opacity: 1;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

.nav-accent:hover {
  transform: scale(1.05);
  color: var(--bg-color);
  opacity: 0.9;
}

/* Unified Forms, Inputs & Buttons */
input[type="text"] {
  width: 100%;
  max-width: 320px;
  padding: 14px 20px;
  font-size: 17px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  color: var(--text-color);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  margin-right: 12px;
  margin-bottom: 12px;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(41, 151, 255, 0.2);
}

button {
  background-color: var(--text-color);
  color: var(--bg-color);
  border: none;
  padding: 14px 24px;
  font-size: 17px;
  font-weight: 500;
  border-radius: 40px;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
  will-change: transform;
  margin-bottom: 12px;
}

button:hover {
  transform: scale(1.05);
  opacity: 0.9;
}

.progress {
  width: 100%;
  background-color: var(--border-color);
  border-radius: 20px;
  margin: 16px 0;
  overflow: hidden;
  height: 12px;
}

.progress-bar {
  height: 100%;
  background-color: var(--accent-color);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}


.footer .text-link {
  font-size: 14px;
  font-weight: 500;
}

/* Hide divider text in footer */
.footer-divider {
  display: none;
}