/* =========================
   天火藏書 - 統一樣式表
   ========================= */

/* =========================
   Color system: 深色專業主題
   ========================= */
:root {
  --bg: #0b0f12;
  --surface: #0f1518;
  --surface-2: #12161a;
  --card: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.005));
  --border: rgba(255,255,255,0.03);
  --text: #e6eef3;
  --muted: #98a0a6;
  --accent: #6ee7b7;
  --accent-2: #63b3ff;
  --glass: rgba(255,255,255,0.02);
  --shadow: 0 10px 30px rgba(2,6,10,0.6);
  --radius: 12px;
  --radius-sm: 8px;
  --focus: 3px solid rgba(110,231,183,0.14);
  --transition: 220ms cubic-bezier(.2,.9,.3,1);
  --max-width: 1100px;
  --nav-height: 64px;
}

/* =========================
   基礎樣式
   ========================= */
* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(1200px 600px at 10% 10%, rgba(99,179,255,0.03), transparent),
    radial-gradient(1000px 400px at 90% 90%, rgba(110,231,183,0.02), transparent),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.45;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: var(--nav-height);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* =========================
   跳過連結
   ========================= */
.skip-link {
  position: absolute;
  left: 8px;
  top: 8px;
  background: var(--accent);
  color: #04221b;
  padding: 8px 12px;
  border-radius: 8px;
  transform: translateY(-140%);
  transition: transform var(--transition);
  z-index: 2000;
  font-weight: 600;
}

.skip-link:focus {
  transform: translateY(0);
  outline: none;
  box-shadow: var(--focus);
}

/* =========================
   頂部導航
   ========================= */
.site-header {
  height: var(--nav-height);
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1200;
  background: linear-gradient(180deg, rgba(0,0,0,0.36), rgba(0,0,0,0.24));
  backdrop-filter: blur(6px) saturate(120%);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  transition: var(--transition);
}

.brand:hover {
  opacity: 0.8;
}

.logo {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(110,231,183,0.12);
  box-shadow: 0 4px 12px rgba(12,20,24,0.4);
  color: var(--accent);
}

.brand-title {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-title .title {
  font-weight: 600;
  font-size: 0.98rem;
}

.brand-title .tag {
  font-size: 0.74rem;
  color: var(--muted);
  margin-top: 2px;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  transition: all var(--transition);
}

.nav-list a:hover,
.nav-list a:focus {
  color: var(--text);
  background: rgba(255,255,255,0.02);
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0,0,0,0.5);
}

.nav-list a.active {
  color: var(--accent);
  background: rgba(110,231,183,0.08);
}

.nav-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* =========================
   主內容區
   ========================= */
main {
  max-width: var(--max-width);
  margin: 28px auto;
  padding: 20px;
  display: block;
  flex: 1;
  width: 100%;
}

.hero {
  background: var(--card);
  border-radius: var(--radius);
  padding: 48px 28px;
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 28px;
  border: 1px solid var(--border);
  text-align: center;
}

.hero-left {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  margin: 0 0 16px 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.hero p {
  margin: 0 auto;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 65ch;
}

.badge-pro {
  background: rgba(110,231,183,0.15);
  color: var(--accent);
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 6px;
  vertical-align: middle;
  font-weight: 600;
}

.hero-illustration {
  width: 100%;
  max-width: 320px;
  border-radius: 10px;
  padding: 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* =========================
   面板樣式
   ========================= */
.panel {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  margin-bottom: 20px;
}

.panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(2,6,10,0.6);
}

.tool-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(2,6,10,0.6);
}

h1, h2, h3 {
  margin: 0 0 1rem 0;
  font-weight: 400;
  letter-spacing: 0.5px;
}

h1 {
  color: var(--accent);
  font-weight: 600;
}

h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
  margin-bottom: 20px;
}

p {
  color: var(--muted);
  margin-bottom: 1rem;
}

/* =========================
   表單元素
   ========================= */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.full-width {
  grid-column: 1 / -1;
}

.control-group {
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label,
.control-group label.group-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text);
  font-size: 0.9rem;
}

input[type="text"],
input[type="file"],
input[type="number"] {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
  font-family: inherit;
}

input[type="text"]:focus,
input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 6px rgba(110,231,183,0.06);
}

select {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
  width: 100%;
  font-family: inherit;
}

select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 6px rgba(110,231,183,0.06);
}

/* =========================
   單選按鈕與複選框
   ========================= */
.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.radio-label {
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition);
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.radio-label:hover {
  background: rgba(255,255,255,0.02);
  border-color: var(--muted);
  transform: translateY(-2px);
}

input[type="radio"],
input[type="checkbox"] {
  accent-color: var(--accent);
}

.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  height: 100%;
  user-select: none;
}

.checkbox-wrapper:hover {
  border-color: var(--muted);
}

.checkbox-wrapper input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* =========================
   按鈕樣式
   ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 10px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.04);
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  font-size: 0.95rem;
  font-family: inherit;
}

.btn:focus {
  outline: none;
  box-shadow: var(--focus);
}

.btn:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.02);
  color: var(--accent);
}

.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #04221b;
  border: none;
  box-shadow: 0 8px 26px rgba(9,20,26,0.45);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(9,20,26,0.6);
}

/* 全寬主要按鈕（用於工具頁面） */
.btn-primary-full {
  width: 100%;
  justify-content: center;
  padding: 16px;
  font-size: 1rem;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface-2);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* =========================
   檔案上傳區域
   ========================= */
.drop-zone {
  border: 2px dashed var(--border);
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: 20px 20px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  margin-bottom: 24px;
}

.drop-zone h3 {
  margin: 6px 0 4px 0;
  color: var(--text);
  font-weight: 600;
}

.drop-zone p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.icon-upload {
  width: 48px;
  height: 48px;
  margin: 0 auto 0px;
  color: var(--muted);
  transition: var(--transition);
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(110,231,183,0.02), rgba(99,179,255,0.01));
  transform: translateY(-2px);
}

.drop-zone:hover .icon-upload {
  color: var(--accent);
  transform: scale(1.1);
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(110,231,183,0.08), rgba(99,179,255,0.04));
  transform: scale(1.02);
}

#fileInput,
#file-info {
  display: none;
}

#file-info-display {
  margin-top: 10px;
  color: var(--accent);
  font-weight: 700;
}

#error-display {
  margin-top: 10px;
  padding: 12px 16px;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: var(--radius-sm);
  color: #fca5a5;
  font-size: 0.9rem;
  display: none;
}

/* =========================
   設定區域
   ========================= */
.settings-area {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

/* =========================
   資訊區塊
   ========================= */
.info-block {
  background: rgba(0, 209, 178, 0.08);
  border: 1px solid rgba(0, 209, 178, 0.2);
  border-radius: 8px;
  padding: 16px 20px;
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 24px;
}

.info-block strong {
  color: var(--accent);
}

/* =========================
   進度與結果區域
   ========================= */
.progress-section {
  margin-top: 32px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

.status-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

.progress-track {
  background: var(--surface-2);
  height: 6px;
  border-radius: 10px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%;
  transition: width 0.3s ease;
  box-shadow: 0 0 10px rgba(99,179,255,0.06);
}

.log-box {
  margin-top: 20px;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 8px;
  height: 150px;
  overflow-y: auto;
  padding: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: #a5b4fc;
  line-height: 1.5;
}

.log-box::-webkit-scrollbar {
  width: 8px;
}

.log-box::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 4px;
}

.result-section {
  margin-top: 32px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.stat-item {
  background: rgba(255,255,255,0.02);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  border: 1px solid transparent;
}

.stat-item:last-child {
  border-color: rgba(110,231,183,0.3);
  background: rgba(110,231,183,0.05);
}

.stat-val {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
}

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

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

/* =========================
   控制台輸出
   ========================= */
#console-output {
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.8rem;
  color: #a5b4fc;
  min-height: 150px;
  margin-top: 20px;
  line-height: 1.5;
  overflow-y: auto;
  max-height: 300px;
}

.log-line {
  margin-bottom: 5px;
  border-bottom: 1px solid #111;
  padding-bottom: 2px;
}

/* =========================
   頁尾
   ========================= */
.site-footer {
  margin-top: auto;
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  align-items: center;
  padding: 6px 12px;
}

/* =========================
   響應式設計
   ========================= */

/* 漢堡選單：桌面隱藏 */
.nav-toggle {
  display: none;
}

@media (max-width: 940px) {
  /* 漢堡按鈕 */
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--muted);
    padding: 0;
    cursor: pointer;
    transition: var(--transition);
    -webkit-appearance: none;
    appearance: none;
    flex-shrink: 0;
  }

  .nav-toggle:hover,
  .nav-toggle:focus-visible {
    color: var(--text);
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.1);
  }

  .site-header.nav-open .nav-toggle {
    color: var(--accent);
    background: rgba(110,231,183,0.08);
    border-color: rgba(110,231,183,0.2);
  }

  /* 讓下拉選單相對於 nav-wrap 定位 */
  .nav-wrap {
    position: relative;
  }

  /* 手機下拉選單 */
  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 180px;
    flex-direction: column;
    list-style: none;
    margin: 4px 0 0 0;
    padding: 6px 0;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(2,6,10,0.6);
    z-index: 1100;
  }

  .site-header.nav-open .nav-list {
    display: flex;
  }

  .nav-list li + li {
    border-top: 1px solid var(--border);
  }

  .nav-list a {
    display: block;
    padding: 12px 20px;
    font-size: 0.95rem;
    white-space: nowrap;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    padding-top: var(--nav-height);
  }

  .hero {
    padding: 32px 18px;
  }

  .hero h1 {
    font-size: 1.6rem;
    flex-direction: column;
    gap: 8px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    gap: 12px;
  }

  .nav-actions .btn {
    display: none;
  }
}

/* =========================
   工具類
   ========================= */
.hidden {
  display: none !important;
}

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

.text-center {
  text-align: center;
}

.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 焦點樣式 */
:focus {
  outline: none;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus);
  border-radius: 10px;
}

.hint-link {
  float: right;
  font-size: 0.8rem;
  opacity: 0.7;
  color: var(--accent);
}