/* plsbot — 現代化 UI */

:root {
  --bg: #f4f6fb;
  --bg-grad-a: #eef2ff;
  --bg-grad-b: #fdf2f8;
  --card: #ffffff;
  --ink: #16181f;
  --muted: #5d6575;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --accent-grad: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #db2777 100%);
  --pass: #16a34a;
  --warn: #d97706;
  --fail: #dc2626;
  --info: #2563eb;
  --border: #e6e9f2;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(22, 24, 31, 0.04), 0 8px 24px rgba(22, 24, 31, 0.06);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(60rem 30rem at 110% -10%, var(--bg-grad-b), transparent 60%),
    radial-gradient(60rem 30rem at -10% -10%, var(--bg-grad-a), transparent 60%),
    var(--bg);
  color: var(--ink);
  line-height: 1.75;
}

/* 語言切換：依 body[data-lang] 顯示對應內容 */
body[data-lang="zh"] .lang-en { display: none; }
body[data-lang="en"] .lang-zh { display: none; }

/* ---------- 導覽列 ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
nav {
  max-width: 1020px; margin: 0 auto; padding: 0.7rem 1.2rem;
  display: flex; align-items: center; gap: 1.4rem;
}
nav a { color: var(--ink); text-decoration: none; font-weight: 500; }
nav a:hover { color: var(--accent); }
.brand { font-weight: 900; font-size: 1.2rem; letter-spacing: -0.02em; }
.logo { display: inline-block; transform: translateY(1px); }
.nav-links { display: flex; gap: 1.2rem; margin-right: auto; }
.lang-switch {
  display: flex; border: 1px solid var(--border); border-radius: 999px;
  overflow: hidden; background: #fff;
}
.lang-switch button {
  border: 0; background: transparent; padding: 0.3rem 0.95rem;
  font: inherit; font-size: 0.88rem; font-weight: 600; cursor: pointer; color: var(--muted);
}
.lang-switch button.active { background: var(--accent); color: #fff; }

/* ---------- 版面 ---------- */
main { max-width: 1020px; margin: 0 auto; padding: 2rem 1.2rem 4rem; }
footer {
  max-width: 1020px; margin: 0 auto; padding: 1.2rem;
  color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--border);
}

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 2.6rem 1rem 2.2rem; }
.hero-badge {
  display: inline-block; font-size: 0.82rem; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); border: 1px solid #dfe3ff;
  border-radius: 999px; padding: 0.25rem 1rem; margin-bottom: 1.1rem;
}
.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3rem); font-weight: 900; letter-spacing: -0.03em;
  margin: 0 0 0.8rem;
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { max-width: 44rem; margin: 0 auto 0.5rem; color: var(--muted); font-size: 1.05rem; }
.hero .privacy { font-size: 0.9rem; font-weight: 600; color: var(--pass); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem 1.8rem; margin: 1.4rem 0;
  box-shadow: var(--shadow);
}
.card h2 { margin-top: 0.2rem; letter-spacing: -0.01em; }
.card h3 { margin-bottom: 0.3rem; }

/* ---------- 上傳區 ---------- */
.dropzone {
  border: 2px dashed #c7cdf5; border-radius: var(--radius);
  background: linear-gradient(180deg, #fbfcff, #f5f7ff);
  padding: 2.2rem 1rem; text-align: center; cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--accent); outline: none; }
.dropzone.dragging { border-color: var(--accent); background: var(--accent-soft); transform: scale(1.005); }
.dz-icon { font-size: 2.2rem; }
.dz-main { font-weight: 700; margin: 0.5rem 0 0.2rem; }
.dz-sub { color: var(--muted); font-size: 0.9rem; margin: 0; }
.upload-row { display: flex; align-items: center; gap: 1rem; margin-top: 1rem; }
.filename { color: var(--muted); font-size: 0.92rem; flex: 1; word-break: break-all; }
button.primary {
  background: var(--accent-grad); color: #fff; border: 0; border-radius: 12px;
  padding: 0.65rem 1.8rem; font: inherit; font-size: 1rem; font-weight: 700; cursor: pointer;
  box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
  transition: transform 0.1s, box-shadow 0.1s, filter 0.1s;
}
button.primary:hover { filter: brightness(1.07); transform: translateY(-1px); }
button.primary:active { transform: translateY(0); }
.howto { margin-top: 1.1rem; }
.flash {
  background: #fef3c7; border: 1px solid #f59e0b; color: #78350f;
  border-radius: 10px; padding: 0.6rem 1rem; margin-top: 1rem; font-size: 0.95rem;
}

/* ---------- 特色卡 ---------- */
.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.1rem; margin: 1.4rem 0;
}
.feature {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.3rem 1.4rem; box-shadow: var(--shadow);
}
.feature .f-icon {
  width: 2.6rem; height: 2.6rem; display: grid; place-items: center;
  font-size: 1.3rem; border-radius: 12px; background: var(--accent-soft);
  margin-bottom: 0.6rem;
}
.feature h3 { margin: 0 0 0.3rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ---------- 結果頁 ---------- */
.result-head h1 { margin: 0 0 0.4rem; font-size: 1.5rem; letter-spacing: -0.01em; }
.tag {
  display: inline-block; background: var(--accent-soft); color: var(--accent);
  border: 1px solid #dfe3ff; border-radius: 999px;
  padding: 0.12rem 0.75rem; margin: 0.15rem 0.2rem; font-size: 0.84rem; font-weight: 600;
}
.badge {
  display: inline-block; border-radius: 8px; padding: 0.1rem 0.6rem;
  color: #fff; font-size: 0.82rem; font-weight: 700; vertical-align: middle;
}
.badge-pass { background: var(--pass); }
.badge-warn { background: var(--warn); }
.badge-fail { background: var(--fail); }
.badge-info { background: var(--info); }
.check {
  border-left: 4px solid var(--border); border-radius: 4px;
  padding: 0.3rem 0 0.3rem 1.1rem; margin: 1.1rem 0;
}
.check-pass { border-color: var(--pass); }
.check-warn { border-color: var(--warn); }
.check-fail { border-color: var(--fail); }
.check-info { border-color: var(--info); }
.criterion { color: var(--muted); font-size: 0.92rem; margin: 0.2rem 0; }
.advice { background: #f6f7fd; border-radius: 10px; padding: 0.55rem 0.9rem; font-size: 0.95rem; }
.note { color: var(--muted); }
.steps li { margin: 0.5rem 0; }
.draft {
  background: #f8f9fe; border-left: 3px solid var(--accent);
  border-radius: 4px; padding: 0.7rem 1.1rem;
}

/* ---------- 表格 ---------- */
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { border: 1px solid var(--border); padding: 0.5rem 0.75rem; text-align: left; }
th { background: #f6f7fd; font-weight: 700; }
tbody tr:nth-child(even) { background: #fbfcff; }

dl dt { font-weight: 700; margin-top: 0.9rem; }
dl dd { margin-left: 0; color: var(--muted); }
details summary { cursor: pointer; color: var(--accent); font-weight: 600; }
details[open] summary { margin-bottom: 0.3rem; }

/* ---------- 響應式 ---------- */
@media (max-width: 640px) {
  nav { flex-wrap: wrap; gap: 0.6rem; }
  .nav-links { order: 3; width: 100%; justify-content: center; }
  .card { padding: 1.2rem 1.1rem; }
  .upload-row { flex-direction: column; align-items: stretch; }
  button.primary { width: 100%; }
}

/* ---------- AI 深度解讀 ---------- */
.ai-card { border-top: 4px solid var(--accent); }
.ai-output {
  margin-top: 1.1rem; padding: 1.1rem 1.3rem;
  background: linear-gradient(180deg, #fbfcff, #f5f7ff);
  border: 1px solid var(--border); border-radius: 12px;
  font-size: 0.97rem; line-height: 1.75;
}
.ai-output h3, .ai-output h4, .ai-output h5 { margin: 1rem 0 0.4rem; }
.ai-output h3:first-child, .ai-output h4:first-child, .ai-output p:first-child { margin-top: 0; }
.ai-output ul, .ai-output ol { margin: 0.4rem 0 0.8rem; padding-left: 1.4rem; }
.ai-output code {
  background: var(--accent-soft); border-radius: 6px;
  padding: 0.05rem 0.35rem; font-size: 0.9em;
}
.ai-meta { color: var(--muted); font-size: 0.85rem; margin-bottom: 0; }
.ai-loading { display: flex; align-items: center; gap: 0.7rem; color: var(--muted); margin: 0; }
.ai-error { color: var(--fail); margin: 0; }
.spinner {
  width: 1.1rem; height: 1.1rem; flex: none; border-radius: 50%;
  border: 3px solid var(--accent-soft); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }