/* =============================================
   Digital Hub for Smart Learning - Main CSS
   ============================================= */

:root {
  --navy:   #0B1D3A;
  --navy2:  #132a52;
  --teal:   #0D9488;
  --teal2:  #14B8A6;
  --gold:   #F59E0B;
  --purple: #7C3AED;
  --green:  #059669;
  --red:    #EF4444;
  --bg:     #F0F4F8;
  --card:   #FFFFFF;
  --text:   #1E293B;
  --muted:  #64748B;
  --border: #E2E8F0;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(0,0,0,.07);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.12);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Sarabun', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  padding-top: 68px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }

/* ---- Navbar ---- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(11,29,58,.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  height: 68px;
}
.nav-container {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
  padding: 0 24px; height: 100%;
}
.nav-logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-icon {
  width: 42px; height: 42px; border-radius: 11px;
  background: linear-gradient(135deg, var(--teal), var(--navy2));
  color: #fff; font-family: 'Prompt', sans-serif;
  font-weight: 800; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.logo-icon-sm { width: 36px; height: 36px; font-size: 13px; }
.logo-main { font-family: 'Prompt', sans-serif; font-weight: 700; font-size: 17px; color: #fff; display: block; }
.logo-sub  { font-size: 11px; color: rgba(255,255,255,.55); display: block; margin-top: -2px; }

.nav-links { display: flex; list-style: none; gap: 4px; flex: 1; }
.nav-link {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 8px;
  color: rgba(255,255,255,.75); font-size: 14px; font-weight: 500;
  transition: all .2s;
}
.nav-link:hover, .nav-link.active { background: rgba(255,255,255,.1); color: #fff; }
.nav-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }

.nav-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

/* User menu */
.user-menu { position: relative; }
.user-btn {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.1); border: none;
  padding: 6px 12px; border-radius: 10px;
  color: #fff; cursor: pointer; font-size: 14px; font-family: inherit;
  transition: background .2s;
}
.user-btn:hover { background: rgba(255,255,255,.18); }
.user-avatar-img { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; }
.user-avatar-init {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--teal); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
}
.user-name-short { max-width: 100px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.user-dropdown {
  display: none; position: absolute; top: calc(100% + 8px); right: 0;
  background: #fff; border-radius: var(--radius); padding: 8px;
  box-shadow: var(--shadow-lg); min-width: 220px;
  border: 1px solid var(--border); z-index: 100;
}
.user-dropdown.show { display: block; }
.user-dropdown-header { padding: 8px 12px 12px; }
.user-dropdown-header strong { display: block; font-size: 15px; color: var(--text); }
.user-dropdown-header span { display: block; font-size: 12px; color: var(--muted); }
.role-badge { display: inline-block; font-size: 11px; background: var(--teal); color: #fff; padding: 2px 8px; border-radius: 20px; margin-top: 4px; }
.user-dropdown hr { border: none; border-top: 1px solid var(--border); margin: 4px 0; }
.dropdown-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 8px; font-size: 14px;
  color: var(--text); transition: background .15s;
}
.dropdown-item:hover { background: var(--bg); }
.text-danger { color: var(--red) !important; }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.hamburger span { width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: .3s; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 10px; font-family: 'Sarabun', sans-serif;
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: 2px solid transparent; transition: all .2s; text-decoration: none;
}
.btn-sm  { padding: 7px 14px; font-size: 13px; }
.btn-xs  { padding: 4px 10px; font-size: 12px; }
.btn-lg  { padding: 13px 28px; font-size: 15px; }
.btn-primary   { background: var(--teal);  color: #fff; }
.btn-primary:hover { background: var(--teal2); transform: translateY(-1px); }
.btn-secondary { background: rgba(255,255,255,.15); color: #fff; border-color: rgba(255,255,255,.3); }
.btn-secondary:hover { background: rgba(255,255,255,.25); }
.btn-outline    { background: transparent; color: var(--teal); border-color: var(--teal); }
.btn-outline:hover { background: var(--teal); color: #fff; }
.btn-success    { background: var(--green); color: #fff; }
.btn-danger     { background: var(--red);   color: #fff; }
.btn-ai { background: linear-gradient(135deg, var(--purple), #6D28D9); color: #fff; }
.btn-ai:hover { opacity: .9; transform: translateY(-1px); }

/* ---- Hero ---- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy2) 60%, #1e3a70 100%);
  padding: 100px 24px 80px;
  text-align: center; color: #fff;
}
.hero-orb {
  position: absolute; border-radius: 50%; filter: blur(80px); pointer-events: none;
}
.hero-orb-1 { width: 500px; height: 500px; background: rgba(13,148,136,.25); top: -100px; right: -100px; animation: pulse 6s ease-in-out infinite; }
.hero-orb-2 { width: 400px; height: 400px; background: rgba(124,58,237,.2); bottom: -50px; left: -80px; animation: pulse 8s ease-in-out infinite reverse; }
.hero-orb-3 { width: 300px; height: 300px; background: rgba(245,158,11,.15); top: 50%; left: 50%; transform: translate(-50%,-50%); animation: pulse 10s linear infinite; }
@keyframes pulse { 0%,100%{transform:scale(1);opacity:.6} 50%{transform:scale(1.15);opacity:1} }

.hero-content { position: relative; max-width: 820px; margin: 0 auto; }
.hero-badge {
  display: inline-block; background: rgba(255,255,255,.12); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.2); border-radius: 20px;
  padding: 6px 20px; font-size: 14px; margin-bottom: 24px;
}
.hero-title {
  font-family: 'Prompt', sans-serif; font-size: clamp(36px,6vw,64px);
  font-weight: 800; line-height: 1.15; margin-bottom: 20px;
}
.text-teal { color: var(--teal2); }
.hero-subtitle { font-size: clamp(15px,2vw,18px); color: rgba(255,255,255,.75); max-width: 600px; margin: 0 auto 32px; }

.hero-stats {
  display: flex; justify-content: center; gap: 40px; flex-wrap: wrap;
  background: rgba(255,255,255,.08); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.12); border-radius: 16px;
  padding: 24px 32px; margin: 32px auto; max-width: 700px;
}
.hero-stat { text-align: center; }
.stat-num { font-family: 'Prompt', sans-serif; font-size: 32px; font-weight: 800; color: var(--teal2); }
.stat-label { font-size: 13px; color: rgba(255,255,255,.65); margin-top: 2px; }

.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---- Sections ---- */
.section { padding: 64px 24px; }
.section-alt { background: #fff; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 28px; flex-wrap: wrap; gap: 12px;
}
.section-title { font-family: 'Prompt', sans-serif; font-size: clamp(22px,3vw,30px); font-weight: 700; color: var(--navy); }
.section-subtitle { color: var(--muted); margin-top: 4px; font-size: 15px; }

/* ---- Zone Grid ---- */
.zone-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.zone-card {
  background: var(--card); border-radius: var(--radius); padding: 28px 24px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 10px;
  transition: all .25s;
}
.zone-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--teal); }
.zone-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 26px; }
.zone-title { font-family: 'Prompt', sans-serif; font-size: 16px; font-weight: 600; color: var(--navy); }
.zone-desc { font-size: 13px; color: var(--muted); flex: 1; }
.zone-link { font-size: 13px; font-weight: 600; margin-top: 4px; }

/* ---- Media Cards ---- */
.media-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.media-card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow);
  display: flex; flex-direction: column; transition: all .25s;
}
.media-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.media-thumb { position: relative; height: 160px; overflow: hidden; }
.media-thumb img { width: 100%; height: 100%; object-fit: cover; }
.media-thumb-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.media-type-badge {
  position: absolute; top: 10px; left: 10px;
  padding: 3px 10px; border-radius: 6px; font-size: 11px; font-weight: 700;
}
.media-hot-badge {
  position: absolute; top: 10px; right: 10px;
  background: var(--red); color: #fff;
  padding: 3px 8px; border-radius: 6px; font-size: 11px; font-weight: 700;
}
.media-play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(0,0,0,.6); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 18px;
  transition: background .2s;
}
.media-card:hover .media-play-btn { background: var(--teal); }

.media-body { padding: 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.media-subject { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; }
.media-title { font-size: 14px; font-weight: 600; color: var(--navy); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.media-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.grade-badge { background: var(--navy); color: #fff; font-size: 10px; font-weight: 700; padding: 2px 8px; border-radius: 4px; }
.media-duration { font-size: 12px; color: var(--muted); }
.media-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: auto; padding-top: 10px; border-top: 1px solid var(--border); }
.media-teacher { display: flex; align-items: center; gap: 8px; min-width: 0; }
.teacher-avatar-sm {
  width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0;
  background: var(--teal); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
}
.teacher-name { font-size: 12px; font-weight: 600; color: var(--navy); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.teacher-school { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.media-stats { display: flex; gap: 6px; font-size: 11px; color: var(--muted); flex-shrink: 0; }

/* ---- PLC ---- */
.plc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.plc-card { background: var(--card); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); transition: all .25s; }
.plc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.plc-cover { height: 100px; display: flex; align-items: center; justify-content: center; }
.plc-body { padding: 20px; }
.plc-name { font-family: 'Prompt', sans-serif; font-size: 15px; font-weight: 600; color: var(--navy); margin-bottom: 6px; }
.plc-desc { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.plc-meta { display: flex; gap: 12px; font-size: 12px; color: var(--muted); }
.subject-tag { font-size: 12px; font-weight: 600; display: inline-block; margin-bottom: 8px; }

.plc-detail-header {
  display: flex; align-items: center; gap: 20px; padding: 28px 24px;
  border-radius: var(--radius); color: #fff; margin-bottom: 24px; flex-wrap: wrap;
}
.plc-detail-meta { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; font-size: 14px; opacity: .85; }
.plc-post-form { background: var(--card); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; border: 1px solid var(--border); }
.plc-posts { display: flex; flex-direction: column; gap: 16px; }
.plc-post-card { background: var(--card); border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); }
.post-author { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.post-author-name { font-weight: 600; font-size: 14px; }
.post-date { font-size: 12px; color: var(--muted); }
.post-content { font-size: 14px; line-height: 1.7; }
.post-actions { display: flex; gap: 16px; margin-top: 12px; font-size: 13px; color: var(--muted); }

/* ---- Library Layout ---- */
.library-layout { display: grid; grid-template-columns: 260px 1fr; gap: 28px; padding-top: 28px; padding-bottom: 40px; align-items: start; }
.filter-sidebar { position: sticky; top: 88px; background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); overflow-y: auto; max-height: calc(100vh - 100px); }
.filter-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 18px 12px; border-bottom: 1px solid var(--border); }
.filter-header h3 { font-size: 15px; font-weight: 700; color: var(--navy); }
.btn-clear { font-size: 12px; color: var(--teal); font-weight: 600; }
.filter-group { padding: 14px 18px; border-bottom: 1px solid var(--border); }
.filter-group-title { font-size: 13px; font-weight: 700; color: var(--navy); cursor: pointer; display: flex; justify-content: space-between; margin-bottom: 10px; }
.filter-search-input { width: 100%; padding: 8px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-family: inherit; font-size: 13px; }
.filter-checkbox { display: flex; align-items: center; gap: 8px; font-size: 13px; cursor: pointer; padding: 3px 0; }
.filter-checkbox input { accent-color: var(--teal); }
.filter-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.grade-pills { display: flex; flex-wrap: wrap; gap: 6px; }
.grade-pill { padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; background: var(--bg); color: var(--navy); border: 1.5px solid var(--border); transition: all .15s; }
.grade-pill.active, .grade-pill:hover { background: var(--navy); color: #fff; border-color: var(--navy); }

.library-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; gap: 12px; flex-wrap: wrap; }
.result-count { font-size: 14px; color: var(--muted); }
.toolbar-right { display: flex; align-items: center; gap: 10px; }
.sort-select { padding: 7px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-family: inherit; font-size: 13px; background: var(--card); }
.view-toggle { display: flex; border: 1.5px solid var(--border); border-radius: 8px; overflow: hidden; }
.view-btn { padding: 6px 10px; background: var(--card); border: none; cursor: pointer; font-size: 16px; transition: background .15s; }
.view-btn.active, .view-btn:hover { background: var(--navy); color: #fff; }

.media-tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 2px solid var(--border); padding-bottom: -2px; overflow-x: auto; }
.media-tab { padding: 10px 18px; font-size: 14px; font-weight: 600; color: var(--muted); border-radius: 8px 8px 0 0; white-space: nowrap; border-bottom: 2px solid transparent; margin-bottom: -2px; }
.media-tab.active { color: var(--teal); border-bottom-color: var(--teal); }
.tab-count { font-size: 11px; background: var(--bg); padding: 1px 6px; border-radius: 10px; margin-left: 4px; }

/* ---- Pagination ---- */
.pagination { display: flex; gap: 6px; justify-content: center; margin-top: 32px; flex-wrap: wrap; }
.page-btn { padding: 8px 14px; border-radius: 8px; background: var(--card); border: 1.5px solid var(--border); font-size: 13px; font-weight: 600; transition: all .15s; }
.page-btn:hover, .page-btn.active { background: var(--navy); color: #fff; border-color: var(--navy); }
.page-ellipsis { padding: 8px 4px; font-size: 13px; color: var(--muted); }

/* ---- Page Hero ---- */
.page-hero { padding: 48px 24px; text-align: center; color: #fff; }
.page-hero h1 { font-family: 'Prompt', sans-serif; font-size: clamp(24px,4vw,36px); font-weight: 800; margin-bottom: 8px; }
.page-hero p { font-size: 15px; opacity: .8; }
.badge-stat { background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25); padding: 5px 16px; border-radius: 20px; font-size: 13px; }

/* ---- Upload Form ---- */
.upload-channels { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 28px; }
.channel-card {
  border: 2px solid var(--border); border-radius: var(--radius); padding: 24px;
  text-align: center; cursor: pointer; transition: all .2s;
}
.channel-card:hover, .channel-card.active { border-color: var(--teal); background: #F0FDFA; }
.channel-card h3 { font-size: 15px; font-weight: 700; margin: 8px 0 4px; }
.channel-card p  { font-size: 12px; color: var(--muted); }

.upload-form, .ai-form { background: var(--card); border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); }
.form-group { margin-bottom: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 700; color: var(--navy); margin-bottom: 6px; }
.required { color: var(--red); }
.form-input {
  width: 100%; padding: 10px 14px;
  border: 1.5px solid var(--border); border-radius: 10px;
  font-family: 'Sarabun', sans-serif; font-size: 14px; background: var(--bg);
  transition: border-color .2s; resize: vertical;
}
.form-input:focus { outline: none; border-color: var(--teal); background: #fff; }

.grade-check-group { display: flex; flex-wrap: wrap; gap: 8px; }
.grade-check { display: flex; align-items: center; gap: 6px; padding: 6px 14px; border: 1.5px solid var(--border); border-radius: 8px; cursor: pointer; font-size: 13px; font-weight: 600; }
.grade-check input { accent-color: var(--teal); }

.preview-box { border: 2px solid var(--teal); border-radius: var(--radius); overflow: hidden; margin-bottom: 18px; }
.preview-box iframe { width: 100%; height: 280px; border: none; display: block; }

/* ---- AI Layout ---- */
.ai-layout { display: grid; grid-template-columns: 240px 1fr; gap: 24px; padding-top: 28px; padding-bottom: 40px; align-items: start; }
.ai-sidebar { position: sticky; top: 88px; background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.ai-tool-list { padding: 8px; }
.ai-tool-btn {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px;
  border-radius: 10px; transition: all .15s; width: 100%;
}
.ai-tool-btn:hover, .ai-tool-btn.active { background: var(--navy); color: #fff; }
.ai-tool-btn.active .tool-desc { color: rgba(255,255,255,.65); }
.tool-icon { font-size: 20px; width: 32px; text-align: center; }
.tool-label { font-size: 13px; font-weight: 700; }
.tool-desc { font-size: 11px; color: var(--muted); }
.ai-history { padding: 12px; border-top: 1px solid var(--border); }
.ai-history-title { font-size: 11px; font-weight: 700; color: var(--muted); text-transform: uppercase; margin-bottom: 8px; }
.ai-history-item { display: flex; gap: 8px; font-size: 12px; color: var(--muted); padding: 4px 0; }

.ai-tool-panel, .ai-chat-panel { background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.ai-tool-panel { padding: 28px; }
.ai-tool-panel h2 { font-family: 'Prompt', sans-serif; font-size: 20px; font-weight: 700; color: var(--navy); margin-bottom: 20px; }

.ai-output { background: var(--bg); border-radius: var(--radius); margin-top: 24px; padding: 24px; border: 1px solid var(--border); }
.ai-result { font-size: 14px; line-height: 1.8; white-space: pre-wrap; }
.ai-result strong { font-weight: 700; }
.ai-result-actions { display: flex; gap: 10px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }

/* Chat */
.ai-chat-panel { display: flex; flex-direction: column; height: 600px; }
.ai-chat-header { display: flex; align-items: center; gap: 14px; padding: 20px; border-bottom: 1px solid var(--border); }
.ai-avatar { width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--purple), var(--navy)); display: flex; align-items: center; justify-content: center; font-size: 22px; }
.ai-name { font-weight: 700; font-size: 15px; }
.ai-status { font-size: 12px; color: var(--muted); }
.ai-chat-body { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.ai-msg { display: flex; }
.ai-msg-bot { justify-content: flex-start; }
.ai-msg-user { justify-content: flex-end; }
.ai-bubble {
  max-width: 80%; padding: 12px 16px; border-radius: 14px; font-size: 14px; line-height: 1.7;
}
.ai-msg-bot .ai-bubble  { background: var(--bg); color: var(--text); border-radius: 4px 14px 14px 14px; }
.ai-msg-user .ai-bubble { background: var(--navy); color: #fff; border-radius: 14px 4px 14px 14px; }
.ai-chat-footer { border-top: 1px solid var(--border); padding: 16px; }
.quick-prompts { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.quick-prompts button { padding: 5px 12px; border: 1.5px solid var(--border); border-radius: 20px; background: var(--card); font-size: 12px; cursor: pointer; font-family: inherit; transition: all .15s; }
.quick-prompts button:hover { border-color: var(--teal); color: var(--teal); }
.chat-input-row { display: flex; gap: 10px; align-items: flex-end; }
.chat-input { flex: 1; padding: 10px 14px; border: 1.5px solid var(--border); border-radius: 12px; font-family: inherit; font-size: 14px; resize: none; }
.chat-input:focus { outline: none; border-color: var(--teal); }
.chat-send-btn { width: 44px; height: 44px; border-radius: 12px; background: var(--teal); border: none; color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

/* ---- Dashboard ---- */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; margin-bottom: 28px; }
.kpi-card { background: var(--card); border-radius: var(--radius); padding: 20px 22px; border: 1px solid var(--border); display: flex; gap: 16px; align-items: flex-start; }
.kpi-icon { font-size: 28px; }
.kpi-value { font-family: 'Prompt', sans-serif; font-size: 28px; font-weight: 800; }
.kpi-label { font-size: 13px; font-weight: 600; color: var(--navy); }
.kpi-sub { font-size: 12px; color: var(--muted); }
.dashboard-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dash-panel { background: var(--card); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); }
.dash-panel h3 { font-family: 'Prompt', sans-serif; font-size: 16px; font-weight: 700; color: var(--navy); margin-bottom: 16px; }

.bar-chart { display: flex; flex-direction: column; gap: 10px; }
.bar-row { display: grid; grid-template-columns: 80px 1fr 40px; gap: 10px; align-items: center; }
.bar-label { font-size: 12px; color: var(--muted); text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { height: 10px; background: var(--bg); border-radius: 5px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 5px; transition: width .6s; }
.bar-value { font-size: 12px; font-weight: 600; color: var(--navy); }

.top-list { display: flex; flex-direction: column; gap: 10px; }
.top-item { display: flex; align-items: center; gap: 10px; padding: 8px 0; }
.top-rank { width: 24px; height: 24px; border-radius: 50%; color: #fff; display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 800; flex-shrink: 0; }
.top-name { flex: 1; font-size: 13px; font-weight: 600; color: var(--navy); }
.top-count { font-size: 12px; color: var(--muted); }

/* Admin Table */
.table-responsive { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th { background: var(--bg); padding: 10px 14px; text-align: left; font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .4px; }
.admin-table td { padding: 12px 14px; border-top: 1px solid var(--border); }
.admin-table tr:hover td { background: var(--bg); }
.type-tag { background: var(--navy); color: #fff; padding: 2px 8px; border-radius: 4px; font-size: 11px; }
.role-tag { font-size: 12px; }
.link-small { font-size: 12px; color: var(--teal); }

/* ---- CTA ---- */
.cta-section { padding: 64px 24px; }
.cta-box { background: linear-gradient(135deg, var(--navy), var(--navy2)); color: #fff; border-radius: 20px; padding: 56px 40px; text-align: center; }
.cta-box h2 { font-family: 'Prompt', sans-serif; font-size: 32px; font-weight: 800; }
.cta-box p { font-size: 16px; opacity: .8; margin-top: 8px; }

/* ---- Footer ---- */
.footer { background: var(--navy); color: rgba(255,255,255,.75); padding: 48px 0 0; }
.footer-container { max-width: 1280px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1fr 300px; gap: 40px; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-logo-title { font-family: 'Prompt', sans-serif; font-weight: 700; font-size: 16px; color: #fff; }
.footer-logo-sub { font-size: 12px; opacity: .65; }
.footer-desc { font-size: 13px; line-height: 1.8; max-width: 380px; }
.footer-links-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.footer-links-grid h4 { font-size: 13px; font-weight: 700; color: #fff; margin-bottom: 12px; text-transform: uppercase; letter-spacing: .5px; }
.footer-links-grid ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-links-grid a { font-size: 13px; transition: color .2s; }
.footer-links-grid a:hover { color: var(--teal2); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 32px; padding: 16px 24px; max-width: 1280px; margin-left: auto; margin-right: auto; display: flex; justify-content: space-between; font-size: 12px; flex-wrap: wrap; gap: 8px; }

/* ---- Alerts ---- */
.alert { padding: 14px 18px; border-radius: 10px; font-size: 14px; margin-bottom: 20px; }
.alert-success { background: #F0FDF4; border: 1px solid #86EFAC; color: #166534; }
.alert-error   { background: #FEF2F2; border: 1px solid #FCA5A5; color: #991B1B; }

/* ---- Scroll Top ---- */
.scroll-top {
  position: fixed; bottom: 28px; right: 28px; z-index: 500;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--navy); color: #fff; border: none;
  display: none; align-items: center; justify-content: center;
  cursor: pointer; box-shadow: var(--shadow-lg);
  transition: all .2s;
}
.scroll-top:hover { background: var(--teal); }
.scroll-top.show { display: flex; }

/* ---- Empty State ---- */
.empty-state { text-align: center; padding: 64px 24px; color: var(--muted); }
.empty-state h3 { font-size: 18px; font-weight: 700; color: var(--navy); margin: 12px 0 8px; }

/* ---- Subject Pill ---- */
.subject-pill { padding: 7px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; transition: all .15s; }
.subject-pill:hover { filter: brightness(1.1); transform: translateY(-1px); }

/* ====== RESPONSIVE ====== */
@media (max-width: 1024px) {
  .library-layout { grid-template-columns: 1fr; }
  .filter-sidebar { position: relative; top: 0; max-height: none; display: none; }
  .filter-sidebar.open { display: block; }
  .ai-layout { grid-template-columns: 1fr; }
  .ai-sidebar { position: relative; top: 0; }
  .ai-chat-panel { height: 500px; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .footer-container { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  body { padding-top: 60px; }
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--navy); padding: 16px; gap: 4px; }
  .hamburger { display: flex; }
  .user-name-short { display: none; }
  .hero { padding: 60px 20px 48px; }
  .hero-stats { flex-direction: row; gap: 20px; }
  .form-row { grid-template-columns: 1fr; }
  .upload-channels { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .zone-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .zone-grid { grid-template-columns: 1fr; }
  .media-grid { grid-template-columns: 1fr; }
  .plc-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 16px; padding: 16px; }
  .stat-num { font-size: 24px; }
}