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

:root {
  --bg: #0a0e17;
  --surface: #131928;
  --border: #1e2a3a;
  --text: #c8d6e5;
  --text-dim: #6b7b8d;
  --accent: #00d4aa;
  --accent-glow: rgba(0, 212, 170, 0.15);
  --milestone: #f0c040;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

/* === Header === */
header {
  border-bottom: 1px solid var(--border);
  padding: 3rem 1.5rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, #0f1623 0%, var(--bg) 100%);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.subtitle {
  margin-top: 0.5rem;
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* === Timeline === */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--border));
}

/* === 日誌卡片 === */
.entry {
  position: relative;
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

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

.entry::before {
  content: "";
  position: absolute;
  left: -2.35rem;
  top: 1.8rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.entry.milestone::before {
  background: var(--milestone);
  box-shadow: 0 0 12px rgba(240, 192, 64, 0.3);
  width: 12px;
  height: 12px;
  left: -2.45rem;
}

.entry-date {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.entry-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0.4rem 0 0.8rem;
  color: #fff;
}

.entry.milestone .entry-title::after {
  content: " ★";
  color: var(--milestone);
}

.entry-body p {
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}

.entry-tags {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(0, 212, 170, 0.25);
}

/* === Footer === */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

/* === Loading === */
.loading {
  text-align: center;
  color: var(--text-dim);
  padding: 3rem 0;
}

/* === 空狀態 === */
.empty {
  text-align: center;
  color: var(--text-dim);
  padding: 4rem 0;
}

/* === RWD === */
@media (max-width: 480px) {
  header { padding: 2rem 1rem 1.5rem; }
  h1 { font-size: 1.5rem; }
  main { padding: 1.5rem 1rem 3rem; }
  .timeline { padding-left: 1.5rem; }
  .entry { padding: 1.2rem; }
  .entry::before { left: -1.85rem; }
  .entry.milestone::before { left: -1.95rem; }
}