/* ==========================================================================
   教學工具箱與個人品牌網站 - 核心樣式表
   支援：日間模式 (Light Theme) 與 夜間模式 (Dark Theme) 雙主題風格、RWD 響應式排版
   ========================================================================== */

:root {
  /* --------------------------------------------------------------------------
     日間模式 (Day Mode / Light Theme - 預設)
     -------------------------------------------------------------------------- */
  --page-bg: #fffaf2;
  --page-surface: rgba(255, 255, 255, 0.92);
  --page-surface-strong: #ffffff;
  --page-text: #2d2118;
  --page-muted: #6f6258;
  --page-border: #eadcc9;
  --page-shadow: 0 10px 30px rgba(76, 42, 18, 0.08);

  /* 主題色與強調色彩 */
  --accent-orange: #f47b20;
  --accent-orange-dark: #c7520f;
  --accent-orange-light: rgba(244, 123, 32, 0.1);
  --accent-blue: #0084d8;
  --accent-cyan: #0077b6;
  --accent-purple: #7928ca;
  --accent-green: #2d8a00;

  /* 導覽列 */
  --nav-bg: rgba(255, 255, 255, 0.95);
  --nav-muted: #6f6258;
  --nav-border: rgba(244, 123, 32, 0.2);
  --nav-shadow: 0 4px 20px rgba(76, 42, 18, 0.08);
  --nav-logo: #2d2118;
  --nav-link-hover: #c7520f;
  --nav-link-hover-bg: rgba(244, 123, 32, 0.08);

  /* 卡片與元件樣式 */
  --card-bg: var(--page-surface);
  --card-hover-bg: #ffffff;
  --card-border: var(--page-border);
  --card-shadow: 0 4px 20px rgba(76, 42, 18, 0.06);
  --card-hover-shadow: 0 12px 32px rgba(244, 123, 32, 0.15);

  --radius-sm: 8px;
  --radius: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --hero-title-gradient: linear-gradient(135deg, #2d2118 20%, #c7520f 65%, #f47b20 100%);
  --tool-btn-bg: linear-gradient(135deg, rgba(244, 123, 32, 0.1), rgba(244, 123, 32, 0.2));
  --tool-btn-color: #c7520f;
  --tool-btn-hover-bg: linear-gradient(135deg, #f47b20, #ff9e00);
  --tool-btn-hover-color: #ffffff;
}

/* --------------------------------------------------------------------------
   夜間模式 (Night Mode / Dark Theme)
   -------------------------------------------------------------------------- */
body[data-theme="dark"],
html[data-theme="dark"] {
  --page-bg: #0b132b;
  --page-surface: rgba(18, 30, 61, 0.85);
  --page-surface-strong: #172554;
  --page-text: #e2e8f0;
  --page-muted: #94a3b8;
  --page-border: rgba(0, 245, 212, 0.22);
  --page-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);

  --accent-orange: #ff9e00;
  --accent-orange-dark: #f47b20;
  --accent-orange-light: rgba(255, 158, 0, 0.15);
  --accent-blue: #38bdf8;
  --accent-cyan: #00f5d4;
  --accent-purple: #c084fc;
  --accent-green: #4ade80;

  --nav-bg: rgba(11, 19, 43, 0.95);
  --nav-muted: #94a3b8;
  --nav-border: rgba(0, 245, 212, 0.2);
  --nav-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
  --nav-logo: #e2e8f0;
  --nav-link-hover: #00f5d4;
  --nav-link-hover-bg: rgba(0, 245, 212, 0.1);

  --card-bg: var(--page-surface);
  --card-hover-bg: rgba(23, 37, 84, 0.98);
  --card-border: var(--page-border);
  --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  --card-hover-shadow: 0 12px 35px rgba(0, 245, 212, 0.2);

  --hero-title-gradient: linear-gradient(135deg, #ffffff 20%, #38bdf8 65%, #00f5d4 100%);
  --tool-btn-bg: linear-gradient(135deg, rgba(0, 245, 212, 0.12), rgba(56, 189, 248, 0.18));
  --tool-btn-color: #00f5d4;
  --tool-btn-hover-bg: linear-gradient(135deg, #00f5d4, #00b4d8);
  --tool-btn-hover-color: #0b132b;
}

/* ==========================================================================
   全域基礎重置與排版
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--page-bg);
  color: var(--page-text);
  line-height: 1.65;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

main {
  flex: 1;
}

/* ==========================================================================
   Header & 導覽列
   ========================================================================== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--nav-border);
  box-shadow: var(--nav-shadow);
  transition: var(--transition);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--nav-logo);
  font-family: 'Orbitron', 'Noto Sans TC', sans-serif;
  letter-spacing: 0.5px;
}

.logo-badge {
  background: linear-gradient(135deg, var(--accent-orange), #ff9e00);
  color: #ffffff;
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-weight: 700;
}

body[data-theme="dark"] .logo-badge {
  background: linear-gradient(135deg, var(--accent-cyan), #00b4d8);
  color: #0b132b;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 8px;
}

.nav-link {
  text-decoration: none;
  color: var(--nav-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--nav-link-hover);
  background-color: var(--nav-link-hover-bg);
}

/* 導覽列下拉選單樣式 */
.nav-item-dropdown {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  list-style: none;
  padding: 8px 0;
  z-index: 200;
}

.nav-item-dropdown:hover .dropdown-menu,
.nav-item-dropdown:focus-within .dropdown-menu {
  display: block;
  animation: fadeInDown 0.2s ease forwards;
}

.dropdown-menu li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  color: var(--page-text);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}

.dropdown-menu li a:hover {
  background: var(--page-bg);
  color: var(--accent-orange);
  padding-left: 22px;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translate(-50%, -8px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

.theme-toggle {
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  color: var(--page-text);
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
}

.theme-toggle:hover {
  border-color: var(--accent-orange);
}

body[data-theme="dark"] .theme-toggle:hover {
  border-color: var(--accent-cyan);
}

.brand-social-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent-orange), #ff9e00);
  color: #ffffff !important;
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 600;
  transition: var(--transition);
}

body[data-theme="dark"] .brand-social-btn {
  background: linear-gradient(135deg, var(--accent-cyan), #0084d8);
  color: #0b132b !important;
}

.brand-social-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(244, 123, 32, 0.3);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--page-text);
  cursor: pointer;
}

/* ==========================================================================
   Hero 主視覺區塊
   ========================================================================== */
.hero {
  padding: 55px 0 35px;
  text-align: center;
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 900;
  background: var(--hero-title-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--page-muted);
  max-width: 680px;
  margin: 0 auto 35px;
  line-height: 1.7;
}

/* 4 大快捷入口卡片 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 25px;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(8px);
  text-decoration: none;
  color: inherit;
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-orange);
  box-shadow: var(--card-hover-shadow);
}

body[data-theme="dark"] .stat-card:hover {
  border-color: var(--accent-cyan);
}

.stat-number {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-orange-dark);
  margin-bottom: 4px;
  font-family: 'Orbitron', 'Noto Sans TC', sans-serif;
}

body[data-theme="dark"] .stat-number {
  color: var(--accent-cyan);
}

.stat-label {
  font-size: 0.88rem;
  color: var(--page-muted);
}

/* ==========================================================================
   Section 通用樣式與卡片格線
   ========================================================================== */
.section {
  padding: 40px 0;
  border-top: 1px solid var(--page-border);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.section-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-orange), #ff9e00);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  font-family: 'Orbitron', sans-serif;
}

body[data-theme="dark"] .section-icon {
  background: linear-gradient(135deg, var(--accent-cyan), #0084d8);
  color: #0b132b;
}

.section-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--page-text);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 22px;
}

/* 通用卡片 */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-orange);
  background: var(--card-hover-bg);
  box-shadow: var(--card-hover-shadow);
}

body[data-theme="dark"] .card:hover {
  border-color: var(--accent-cyan);
}

.card-title {
  font-size: 1.22rem;
  font-weight: 700;
  margin: 10px 0 8px;
  color: var(--page-text);
}

.card-list {
  list-style: none;
  font-size: 0.95rem;
  color: var(--page-muted);
  line-height: 1.9;
}

.card-list strong {
  color: var(--page-text);
}

.tool-card-image {
  width: 100%;
  height: 170px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 14px;
  background: rgba(0,0,0,0.04);
}

.tool-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.card:hover .tool-card-image img {
  transform: scale(1.04);
}

/* 標籤 Tag 樣式 */
.card-tag {
  align-self: flex-start;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: 4px;
}

.tag-orange { background: var(--accent-orange-light); color: var(--accent-orange-dark); border: 1px solid rgba(244, 123, 32, 0.3); }
.tag-blue   { background: rgba(0, 132, 216, 0.12); color: #0084d8; border: 1px solid rgba(0, 132, 216, 0.3); }
.tag-cyan   { background: rgba(0, 245, 212, 0.12); color: #008f7a; border: 1px solid rgba(0, 245, 212, 0.3); }
.tag-purple { background: rgba(121, 40, 202, 0.12); color: #7928ca; border: 1px solid rgba(121, 40, 202, 0.3); }
.tag-green  { background: rgba(45, 138, 0, 0.12); color: #2d8a00; border: 1px solid rgba(45, 138, 0, 0.3); }

body[data-theme="dark"] .tag-orange { color: #ff9e00; }
body[data-theme="dark"] .tag-blue   { color: #38bdf8; }
body[data-theme="dark"] .tag-cyan   { color: #00f5d4; }
body[data-theme="dark"] .tag-purple { color: #c084fc; }
body[data-theme="dark"] .tag-green  { color: #4ade80; }

/* 按鈕樣式 */
.tool-link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--tool-btn-bg);
  color: var(--tool-btn-color);
  border: 1px solid var(--card-border);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: var(--transition);
}

.tool-link-btn:hover {
  background: var(--tool-btn-hover-bg);
  color: var(--tool-btn-hover-color) !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(244, 123, 32, 0.25);
}

/* ==========================================================================
   Email 訂閱輸入框
   ========================================================================== */
.email-subscribe-box {
  display: flex;
  align-items: center;
  max-width: 520px;
  width: 100%;
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  border-radius: var(--radius-pill);
  padding: 4px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.email-subscribe-box:focus-within {
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 3px var(--accent-orange-light);
}

body[data-theme="dark"] .email-subscribe-box:focus-within {
  border-color: var(--accent-cyan);
}

.email-subscribe-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 18px;
  font-size: 0.95rem;
  color: var(--page-text);
  outline: none;
}

.email-subscribe-btn {
  border: none;
  background: linear-gradient(135deg, var(--accent-orange), #ff9e00);
  color: #ffffff;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: var(--transition);
}

body[data-theme="dark"] .email-subscribe-btn {
  background: linear-gradient(135deg, var(--accent-cyan), #0084d8);
  color: #0b132b;
}

.email-subscribe-btn:hover {
  opacity: 0.92;
  transform: scale(1.02);
}

/* ==========================================================================
   工具倉庫搜尋列 & 分類導覽
   ========================================================================== */
.tool-search-wrapper {
  max-width: 760px;
  margin: 0 auto 30px;
}

.tool-search-box {
  display: flex;
  align-items: center;
  background: var(--page-surface);
  border: 2px solid var(--page-border);
  border-radius: var(--radius-pill);
  padding: 6px 18px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.tool-search-box:focus-within {
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 4px var(--accent-orange-light);
}

body[data-theme="dark"] .tool-search-box:focus-within {
  border-color: var(--accent-cyan);
}

.tool-search-icon {
  font-size: 1.2rem;
  margin-right: 10px;
  opacity: 0.7;
}

.tool-search-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 0;
  font-size: 1.05rem;
  color: var(--page-text);
  outline: none;
}

.tool-search-clear {
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--page-muted);
  cursor: pointer;
  padding: 4px;
}

.hot-keywords-container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
  justify-content: center;
}

.hot-keywords-label {
  font-size: 0.88rem;
  color: var(--page-muted);
  font-weight: 600;
}

.hot-keyword-pill {
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  color: var(--page-text);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition);
}

.hot-keyword-pill:hover, .hot-keyword-pill.active {
  background: var(--accent-orange);
  color: #ffffff;
  border-color: var(--accent-orange);
}

body[data-theme="dark"] .hot-keyword-pill:hover,
body[data-theme="dark"] .hot-keyword-pill.active {
  background: var(--accent-cyan);
  color: #0b132b;
  border-color: var(--accent-cyan);
}

.search-stats-bar {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--page-muted);
}

/* 頂部分類快速導覽 Pills */
.tools-top-bar {
  margin-bottom: 20px;
  padding-top: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.cat-quick-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.cat-quick-pill {
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  color: var(--page-text);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.cat-quick-pill:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange-dark);
  background: var(--accent-orange-light);
  transform: translateY(-2px);
}

body[data-theme="dark"] .cat-quick-pill:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(0, 245, 212, 0.12);
}

/* ==========================================================================
   Footer 頁尾
   ========================================================================== */
footer {
  margin-top: auto;
  border-top: 1px solid var(--page-border);
  background: var(--nav-bg);
  padding: 28px 0;
}

.footer-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-stats-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
}

.stat-badge-divider {
  width: 1px;
  height: 14px;
  background: var(--page-border);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 8px #22c55e;
}

.back-to-top {
  background: var(--page-surface);
  border: 1px solid var(--page-border);
  color: var(--page-text);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.back-to-top:hover {
  border-color: var(--accent-orange);
  transform: translateY(-2px);
}

body[data-theme="dark"] .back-to-top:hover {
  border-color: var(--accent-cyan);
}

/* ==========================================================================
   彈出視窗 (Modals)
   ========================================================================== */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--page-surface-strong);
  border: 1px solid var(--page-border);
  border-radius: var(--radius-md);
  padding: 24px;
  max-width: 800px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.close-btn {
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 1.8rem;
  color: var(--page-muted);
  cursor: pointer;
  transition: var(--transition);
}

.close-btn:hover {
  color: var(--accent-orange);
}

body[data-theme="dark"] .close-btn:hover {
  color: var(--accent-cyan);
}

.cert-modal-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}

/* ==========================================================================
   響應式斷點 (RWD)
   ========================================================================== */
@media (max-width: 868px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
    box-shadow: var(--nav-shadow);
  }

  .nav-menu.active {
    display: flex;
  }

  .hamburger {
    display: block;
  }

  .hero-title {
    font-size: 2rem;
  }

  .footer-wrapper {
    flex-direction: column;
    text-align: center;
  }
}