:root {

  --bg: #0b0e14;
  --card: #151921;
  --text: #f0f6fc;
  --dim: #8b949e;
  --border: #30363d;
  --accent: #58a6ff;
  --shadow: rgba(0, 0, 0, 0.3);
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body.light-mode {
 
  --bg: #f6f8fa;
  --card: #ffffff;
  --text: #1f2328;
  --dim: #57606a;
  --border: #d0d7de;
  --accent: #0969da;
  --shadow: rgba(0, 0, 0, 0.05);
}


* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  line-height: 1.6;
  padding: 16px; 
  transition: background-color 0.3s ease;
}


.container {
  width: 100%;
  max-width: 600px; 
  margin: 0 auto;
  padding-bottom: 80px; 
}

header {
  margin: 32px 0;
  text-align: left;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

header p {
  color: var(--dim);
  font-size: 0.95rem;
}


#feed {
  display: grid;
  grid-template-columns: 1fr; 
  gap: 16px;
}


@media (min-width: 768px) {
  .container {
    max-width: 1100px;
  }
  #feed {
    grid-template-columns: repeat(2, 1fr);
    align-items: start; 
  }
}

@media (min-width: 1100px) {
  #feed {
    grid-template-columns: repeat(3, 1fr);
  }
}


.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px; /* Modern rounded look */
  padding: 24px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 12px var(--shadow);
  transition: transform 0.2s ease, border-color 0.2s ease;
  animation: slideUp 0.4s ease-out;
  height: fit-content; 

.card:hover {
  border-color: var(--dim);
  transform: translateY(-2px);
}

.card-content {
  font-size: 1.1rem; 
  white-space: pre-wrap; 
  word-wrap: break-word;
}

.timestamp {
  margin-top: 16px;
  font-size: 0.75rem;
  color: var(--dim);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 20px;
  border-radius: 30px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.theme-toggle:active {
  transform: scale(0.95);
}

textarea {
  width: 100%;
  height: 180px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  font-family: inherit;
  font-size: 1rem;
  margin-bottom: 16px;
  resize: vertical;
}

button.post-btn {
  background: var(--accent);
  color: #ffffff;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
}

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

.loader {
  text-align: center;
  color: var(--dim);
  padding: 40px;
  grid-column: 1 / -1;
}