@charset "UTF-8";
/* NIU AI Hub 頁面樣式
   aio.niu.edu.tw RPAGE: html font-size 62.5%（1rem = 10px）
   本頁所有樣式皆以 #niu-ai-hub-container 為範圍，避免污染框架 */

html { scroll-behavior: smooth; }

#niu-ai-hub-container {
  font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif;
  font-size: 1.6rem;
  max-width: 120rem;
  margin: 0 auto;
  padding: 2rem 2rem 8rem 2rem;
  background-color: #fff;
  color: #333;
  box-sizing: border-box;
  line-height: 1.5;
}

#niu-ai-hub-container *,
#niu-ai-hub-container *::before,
#niu-ai-hub-container *::after {
  box-sizing: inherit;
}

/* 標題 */
#niu-ai-hub-container h2 {
  font-size: 3.5rem;
  color: #009ADE;
  text-align: center;
  margin-bottom: 3.5rem;
  font-weight: 800;
  position: relative;
  padding-bottom: 1.5rem;
}

#niu-ai-hub-container h2::after {
  content: '';
  display: block;
  width: 6rem;
  height: 0.4rem;
  background: linear-gradient(90deg, #009ADE, #0077CC);
  margin: 1rem auto 0;
  border-radius: 2px;
}

#niu-ai-hub-container h3 {
  font-size: 2.4rem;
  color: #005A82;
  margin: 3rem 0 1.5rem;
}

/* 導向「外部資源申請」頁的區隔說明 */
#niu-ai-hub-container .hub-crosslink {
  max-width: 90rem;
  margin: -2rem auto 4rem;
  padding: 1.4rem 1.8rem;
  background-color: #f0f7fb;
  border-left: 0.4rem solid #007bb0;
  border-radius: 0.6rem;
  font-size: 1.5rem;
  line-height: 1.8;
  color: #333;
}

#niu-ai-hub-container .hub-crosslink a {
  color: #005A82;
  font-weight: 700;
}

#niu-ai-hub-container .hub-crosslink a:hover,
#niu-ai-hub-container .hub-crosslink a:focus-visible {
  text-decoration: underline;
}

/* 過濾按鈕 */
#niu-ai-hub-container .filter-container {
  text-align: center;
  margin-bottom: 4rem;
}

#niu-ai-hub-container .filter-btn {
  display: inline-block;
  padding: 1rem 2rem;
  margin: 0.6rem;
  border: 1px solid #767676;
  border-radius: 2.5rem;
  background-color: #f8f9fa;
  color: #222;
  cursor: pointer;
  font-size: 1.6rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

#niu-ai-hub-container .filter-btn:hover,
#niu-ai-hub-container .filter-btn:focus-visible {
  background-color: #e9ecef;
  outline: 3px solid #ad7a00;
  outline-offset: 2px;
}

#niu-ai-hub-container .filter-btn.active {
  background-color: #007bb0;
  color: #fff;
  border-color: #007bb0;
}

/* 格線與卡片 */
#niu-ai-hub-container .ai-grid-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(30rem, 1fr));
  gap: 2.5rem;
  margin-bottom: 6rem;
}

#niu-ai-hub-container .ai-card {
  background: #fff;
  border-radius: 1.6rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  padding: 2.5rem;
  transition: all 0.3s ease;
  border: 1px solid #eee;
  display: flex;
  flex-direction: column;
}

#niu-ai-hub-container .ai-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: 0 8px 25px rgba(0, 154, 222, 0.15);
}

#niu-ai-hub-container .tool-header {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
}

#niu-ai-hub-container .tool-icon {
  width: 5rem;
  height: 5rem;
  flex-shrink: 0;
  background: #f0f9ff;
  border-radius: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  margin-right: 1.5rem;
  color: #009ADE;
  font-weight: bold;
}

#niu-ai-hub-container .tool-category {
  font-size: 1.4rem;
  color: #005A82;
  background: #e6f7ff;
  padding: 0.5rem 1.2rem;
  border-radius: 2rem;
  display: inline-block;
  margin-bottom: 1.2rem;
  font-weight: 600;
}

#niu-ai-hub-container .tool-title {
  font-size: 2.2rem;
  font-weight: bold;
  color: #333;
  margin: 0;
}

#niu-ai-hub-container .tool-desc {
  font-size: 1.7rem;
  color: #444;
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 2.5rem;
}

#niu-ai-hub-container .btn-primary {
  display: inline-block;
  padding: 1.2rem 2.4rem;
  text-decoration: none;
  background: linear-gradient(135deg, #009ADE 0%, #0077CC 100%);
  color: #fff;
  border-radius: 1rem;
  font-weight: 600;
  text-align: center;
  font-size: 1.6rem;
}

#niu-ai-hub-container .btn-primary:hover {
  filter: brightness(1.08);
}

#niu-ai-hub-container .btn-primary:focus-visible {
  outline: 3px solid #ad7a00;
  outline-offset: 2px;
}

/* 官方學習平台卡片：左側綠邊、平台名標題 */
#niu-ai-hub-container .learn-card {
  border-left: 0.4rem solid #0056D2;
}

#niu-ai-hub-container .provider-name {
  font-size: 1.9rem;
  font-weight: bold;
  color: #0056D2;
  margin: 0 0 1rem;
}

/* 卡片內的次要文字連結（教學文件／教學影片） */
#niu-ai-hub-container .btn-secondary {
  display: inline-block;
  margin-left: 1rem;
  font-size: 1.4rem;
  color: #555;
  text-decoration: underline;
}

/* 標籤 Badge */
#niu-ai-hub-container .tool-badge {
  font-size: 1.2rem;
  padding: 0.2rem 0.8rem;
  border-radius: 0.6rem;
  margin-left: 0.8rem;
  vertical-align: middle;
  border: 1px solid;
}

#niu-ai-hub-container .badge-beta {
  background-color: #fff3cd;
  color: #6b5200;
  border-color: #ffeeba;
}

#niu-ai-hub-container .badge-cn {
  background-color: #f8d7da;
  color: #721c24;
  border-color: #f5c6cb;
}

/* 影音卡片 */
#niu-ai-hub-container .video-card {
  border-left: 0.4rem solid #cc0000;
}

#niu-ai-hub-container .channel-name {
  font-weight: bold;
  color: #b30000;
  margin: 0 0 1rem;
  font-size: 1.8rem;
}

#niu-ai-hub-container .btn-video {
  background: #b30000;
  color: #fff;
}

#niu-ai-hub-container .btn-course {
  background: #0056D2;
  color: #fff;
}

/* 認證卡片 */
#niu-ai-hub-container .cert-card {
  text-align: center;
  padding: 3rem;
  border-top: 0.4rem solid #28a745;
}

#niu-ai-hub-container .cert-logo-placeholder {
  width: 8rem;
  height: 8rem;
  background: #f8f9fa;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.2rem;
  color: #1f8838;
  border: 2px solid #e9ecef;
}

#niu-ai-hub-container .btn-cert {
  background: #1f8838;
  color: #fff;
}

/* 資安宣告 */
#niu-ai-hub-container .security-box {
  background-color: #fffbf0;
  border: 1px solid #ffeeba;
  border-left: 0.5rem solid #ffc107;
  border-radius: 0.8rem;
  padding: 2.5rem;
  margin-top: 5rem;
  color: #555;
  font-size: 1.6rem;
}

#niu-ai-hub-container .security-title {
  color: #8a6d00;
  font-size: 2rem;
  font-weight: bold;
  margin: 0 0 1.5rem;
  display: flex;
  align-items: center;
}

#niu-ai-hub-container .security-list {
  margin: 0;
  padding-left: 2rem;
}

#niu-ai-hub-container .security-list li {
  margin-bottom: 0.8rem;
  line-height: 1.6;
}

/* 章節導航與置頂 */
#niu-ai-hub-container .hub-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 1.2rem;
  margin-bottom: 4rem;
  position: sticky;
  top: 10px;
  z-index: 100;
  border: 1px solid #eee;
}

#niu-ai-hub-container .hub-nav-link {
  text-decoration: none;
  color: #222;
  font-weight: 600;
  padding: 0.8rem 1.5rem;
  margin: 0 1rem;
  font-size: 1.6rem;
  border-radius: 0.6rem;
}

#niu-ai-hub-container .hub-nav-link:hover,
#niu-ai-hub-container .hub-nav-link:focus-visible {
  background: #e6f7ff;
  outline: 2px solid #007bb0;
}

#niu-ai-hub-container #back-to-top {
  position: fixed;
  bottom: 4rem;
  right: 4rem;
  width: 5rem;
  height: 5rem;
  background: #007bb0;
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  font-size: 2.4rem;
}

#niu-ai-hub-container #back-to-top:focus-visible {
  outline: 3px solid #ad7a00;
  outline-offset: 2px;
}

@media (max-width: 768px) {
  #niu-ai-hub-container .ai-grid-section { grid-template-columns: 1fr; }
}