/* Modern CSS Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body,
h1,
h2,
h3,
h4,
p,
ul,
ol,
li,
figure,
figcaption,
blockquote,
dl,
dd {
  margin: 0;
  padding: 0;
}

/* Base Variables - Light Mode */
:root {
  /* Airy Light Theme Colors */
  --color-primary: rgb(87, 123, 179);  /* Soft blue */
  --color-primary-light: rgba(127, 163, 219, 0.08); /* Very light blue background */
  --color-primary-soft: rgba(127, 163, 219, 0.15);
  --color-primary-hover: rgba(127, 163, 219, 0.12);
  --color-background: #ffffff;     /* Pure white for maximum airiness */
  --color-surface: #fafbfc;        /* Barely there gray */
  --color-text: #2c3e50;           /* Softer dark blue-gray */
  --color-text-light: #697b91;     /* Light blue-gray */
  --color-text-lighter: #a8b4c0;   /* Even lighter for subtle elements */
  --color-border: rgba(127, 163, 219, 0.1); /* Very light blue border */
  --color-accent: #5a7491;         /* Muted blue-gray accent */
  
  /* Increased Spacing for Airiness */
  --spacing-xs: 0.5rem;            /* 8px */
  --spacing-sm: 0.75rem;           /* 12px */
  --spacing-md: 1.25rem;           /* 20px */
  --spacing-lg: 2rem;              /* 32px */
  --spacing-xl: 3rem;              /* 48px */
  --spacing-xxl: 4.5rem;           /* 72px */
  --spacing-xxxl: 6rem;            /* 96px */
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'EB Garamond', 'Crimson Text', Georgia, serif;
  --font-display: 'Playfair Display', 'EB Garamond', Georgia, serif;
  
  --radius-sm: 0.375rem;           /* 6px */
  --radius-md: 0.5rem;             /* 8px */
  --radius-lg: 0.75rem;            /* 12px */
  
  --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  
  --max-width: 760px;
  --header-height: 80px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: rgb(147, 183, 239);
    --color-primary-light: rgba(147, 183, 239, 0.05);
    --color-primary-soft: rgba(147, 183, 239, 0.1);
    --color-primary-hover: rgba(147, 183, 239, 0.08);
    --color-background: #0a0a0b;
    --color-surface: #141417;
    --color-text: #e2e8f0;
    --color-text-light: #afb9c8;
    --color-text-lighter: #8595ab;
    --color-border: rgba(147, 183, 239, 0.08);
    --color-accent: #94a3b8;
    
    --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  }
}

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Playfair+Display:wght@400;500;600;700&family=Crimson+Text:wght@400;600&display=swap');

/* Base Styles */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-weight: 400;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-text);
  transition: color var(--transition);
}

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

a:hover {
  opacity: 0.8;
}

/* Header - Minimal and Airy */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: linear-gradient(to bottom, var(--color-background) 70%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--spacing-lg);
  z-index: 100;
  transition: all var(--transition);
}

header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
}

.header-content {
  width: 100%;
  max-width: var(--max-width);
  text-align: center;
}

.logo-container h1 {
  font-size: 2.5rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.logo-container a {
  display: inline-block;
  transition: transform var(--transition);
}

.logo-container a:hover {
  transform: translateY(-2px);
  opacity: 1;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--color-text-light);
  font-weight: 300;
  letter-spacing: 0.01em;
  /*margin-top: var(--spacing-xs);*/
}

/* Main Content */
main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + var(--spacing-xxl)) var(--spacing-lg) var(--spacing-xxxl);
}

/* Posts List - Airy Card Design */
.post-list {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xxl);
}

.post-item {
  background: transparent;
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  transition: transform var(--transition);
}

.post-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), transparent);
  opacity: 0.3;
  transition: opacity var(--transition);
}

.post-item:hover::before {
  opacity: 0.6;
}

.post-item:hover {
  transform: translateX(4px);
}

.post-date {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
  transition: color var(--transition);
}

.post-date:hover {
  color: var(--color-accent);
}

.prompt {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.reply {
  color: var(--color-text-light);
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.8;
  font-weight: 400;
}

.reply p {
  margin-bottom: var(--spacing-md);
}

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

.reply strong {
  color: var(--color-text);
  font-weight: 600;
}

.reply em {
  font-style: italic;
  color: var(--color-accent);
}

/* Single Post View */
#post-detail {
  display: none;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.back-button:hover {
  background: var(--color-primary-hover);
  transform: translateX(-4px);
  opacity: 1;
  border-color: var(--color-border);
}

.single-post {
  background: transparent;
  padding: var(--spacing-lg) 0;
}

.single-post-date {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.single-post .prompt {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.single-post .reply {
  font-size: 1.25rem;
  line-height: 1.9;
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  gap: var(--spacing-md);
}

.loading-icon {
  width: 32px;
  height: 32px;
  animation: spin 1.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
  color: var(--color-primary);
  opacity: 0.6;
}

.loading p {
  color: var(--color-text-lighter);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

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

/* Footer - Minimal */
footer {
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
  text-align: center;
  color: var(--color-text-lighter);
  font-size: 0.875rem;
  font-weight: 300;
  letter-spacing: 0.01em;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xxxl);
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --header-height: 70px;
    --spacing-xxl: 3rem;
    --spacing-xxxl: 4rem;
  }
  
  .prompt {
    font-size: 1.5rem;
  }
  
  .single-post .prompt {
    font-size: 1.75rem;
  }
  
  .reply {
    font-size: 1.05rem;
  }
  
  main {
    padding: calc(var(--header-height) + var(--spacing-xl)) var(--spacing-md) var(--spacing-xxl);
  }
}

@media (max-width: 480px) {
  :root {
    --header-height: 60px;
  }
  
  .logo-container h1 {
    font-size: 1.25rem;
  }
  
  .subtitle {
    font-size: 0.75rem;
  }
  
  .prompt {
    font-size: 1.25rem;
  }
  
  .reply {
    font-size: 1rem;
  }
}

/* Print Styles */
@media print {
  header, footer, .back-button {
    display: none;
  }
  
  main {
    padding: 0;
  }
  
  .post-item {
    page-break-inside: avoid;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* Focus Styles */
a:focus,
button:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Selection Styles */
::selection {
  background: var(--color-primary-soft);
  color: var(--color-text);
}

::-moz-selection {
  background: var(--color-primary-soft);
  color: var(--color-text);
}