/* ══════════════════════════════════════════════════════════════════════
   ระบบการนิเทศการสอน โรงเรียนพิบูลประชาสรรค์ — Theme
   น้ำเงินเข้ม #0B1F4D · ฟ้า #2563EB · ขาว · เทาอ่อน
   ══════════════════════════════════════════════════════════════════════ */
:root{
  --navy:#0B1F4D;
  --navy-700:#122c66;
  --blue:#2563EB;
  --blue-100:#DBEAFE;
  --blue-50:#EFF6FF;
  --gray-50:#F7F8FB;
  --gray-100:#EEF1F6;
  --gray-200:#E2E6ED;
  --gray-400:#98A2B3;
  --gray-600:#5A6579;
  --ink:#0F172A;
  --card:#FFFFFF;
  --bg:#F4F6FA;
  --border:#E4E8F0;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 8px 24px -12px rgba(11,31,77,.18);
  --sidebar-w:252px;
  --topbar-h:60px;
  --ok:#16A34A; --warn:#CA8A04; --danger:#DC2626; --orange:#EA580C;
  --font:'Kanit','IBM Plex Sans Thai',system-ui,-apple-system,'Segoe UI',sans-serif;
}
[data-theme="dark"]{
  --navy:#0A1734; --navy-700:#152a5c;
  --gray-50:#141B2D; --gray-100:#1B2439; --gray-200:#2A3550;
  --gray-600:#9AA5BC;
  --ink:#E8ECF5; --card:#161E31; --bg:#0E1524; --border:#26314B;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
}

*{-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  font-family:var(--font); background:var(--bg); color:var(--ink);
  font-size:15px; margin:0; overflow-x:hidden;
}
.tiny{font-size:.72rem}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:var(--gray-200);border-radius:8px}
::-webkit-scrollbar-track{background:transparent}

/* ─────────────────────────────── Splash ─────────────────────────────── */
.splash{
  position:fixed;inset:0;z-index:2000;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(150deg,var(--navy) 0%,#153579 60%,var(--blue) 130%);
}
.splash-logo{width:78px;height:78px;margin:0 auto;background:#fff;border-radius:50%;
  display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px rgba(0,0,0,.3)}
.splash-logo::after{content:'นท';font-weight:700;font-size:1.6rem;color:var(--navy)}

/* ──────────────────────────────── Login ─────────────────────────────── */
.login-wrap{min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:20px;position:relative}
.login-bg{
  position:fixed;inset:0;z-index:-1;
  background:linear-gradient(150deg,var(--navy) 0%,#16367f 55%,#2563EB 130%);
}
.login-bg::before,.login-bg::after{
  content:'';position:absolute;border-radius:50%;background:rgba(255,255,255,.06)
}
.login-bg::before{width:520px;height:520px;top:-180px;right:-140px}
.login-bg::after{width:380px;height:380px;bottom:-140px;left:-120px}
.login-card{
  width:100%;max-width:430px;background:var(--card);border-radius:20px;padding:36px 32px;
  box-shadow:0 24px 60px -20px rgba(0,0,0,.45);
}
.school-logo{
  width:84px;height:84px;border-radius:50%;background:var(--navy);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.7rem;
  background-size:cover;background-position:center;overflow:hidden;flex:0 0 auto;
}
.school-logo-sm{width:38px;height:38px;font-size:.85rem;background:rgba(255,255,255,.16)}

/* ─────────────────────────────── Topbar ─────────────────────────────── */
.topbar{
  position:fixed;top:0;left:0;right:0;height:var(--topbar-h);z-index:1030;
  background:var(--navy);color:#fff;display:flex;align-items:center;gap:.5rem;padding:0 14px;
  box-shadow:0 2px 12px rgba(11,31,77,.25);
}
.btn-icon{
  background:rgba(255,255,255,.1);border:none;color:#fff;border-radius:10px;
  width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;
  transition:.15s;padding:0
}
.btn-icon:hover{background:rgba(255,255,255,.22);color:#fff}
.dropdown .btn-icon{width:auto;min-width:38px;padding:0 8px}
.avatar{
  width:32px;height:32px;border-radius:50%;background:var(--blue);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:600;flex:0 0 auto
}
.session-pill{
  background:rgba(255,255,255,.12);border-radius:20px;padding:.28rem .7rem;font-size:.78rem;
  align-items:center;gap:.35rem;color:#fff
}
.session-pill.warn{background:rgba(220,38,38,.75);animation:pulse 1.4s infinite}
@keyframes pulse{50%{opacity:.55}}

/* ─────────────────────────────── Sidebar ────────────────────────────── */
.sidebar{
  position:fixed;top:var(--topbar-h);bottom:0;left:0;width:var(--sidebar-w);z-index:1025;
  background:var(--navy);color:#fff;padding:14px 10px;overflow-y:auto;
  display:flex;flex-direction:column;transition:transform .25s ease;
}
.sidebar .nav-link{
  color:rgba(255,255,255,.78);border-radius:10px;padding:.62rem .8rem;margin-bottom:2px;
  display:flex;align-items:center;gap:.65rem;font-size:.92rem;transition:.15s;text-decoration:none
}
.sidebar .nav-link i{font-size:1.05rem;width:20px;text-align:center}
.sidebar .nav-link:hover{background:rgba(255,255,255,.09);color:#fff}
.sidebar .nav-link.active{background:var(--blue);color:#fff;font-weight:500;box-shadow:0 4px 12px rgba(37,99,235,.4)}
.sidebar .nav-section{
  font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.42);
  padding:14px .8rem 5px;font-weight:500
}
.sidebar-footer{margin-top:auto;padding:12px .8rem 4px;border-top:1px solid rgba(255,255,255,.1);font-size:.78rem}
.sidebar-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1024;display:none}
.sidebar-backdrop.show{display:block}

/* ─────────────────────────────── Content ────────────────────────────── */
.content{
  margin-left:var(--sidebar-w);padding:calc(var(--topbar-h) + 20px) 22px 40px;
  min-height:100dvh;
}
@media(max-width:991.98px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.show{transform:translateX(0)}
  .content{margin-left:0;padding:calc(var(--topbar-h) + 14px) 12px 32px}
}

.page-head{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem;margin-bottom:1.1rem}
.page-head h1{font-size:1.42rem;font-weight:600;margin:0;color:var(--ink)}
.page-head .sub{color:var(--gray-600);font-size:.88rem;margin:0}

/* ──────────────────────────────── Cards ─────────────────────────────── */
.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.card-header{background:transparent;border-bottom:1px solid var(--border);font-weight:500;padding:.85rem 1.1rem}
.stat-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:1rem 1.1rem;box-shadow:var(--shadow);height:100%;position:relative;overflow:hidden;
  transition:.18s
}
.stat-card:hover{transform:translateY(-2px);box-shadow:0 10px 28px -14px rgba(11,31,77,.4)}
.stat-card .label{font-size:.82rem;color:var(--gray-600);margin-bottom:.15rem}
.stat-card .value{font-size:1.85rem;font-weight:600;line-height:1.15}
.stat-card .icon{
  position:absolute;right:12px;top:12px;width:40px;height:40px;border-radius:11px;
  display:flex;align-items:center;justify-content:center;font-size:1.15rem
}
.stat-card .foot{font-size:.76rem;color:var(--gray-400);margin-top:.2rem}

/* ─────────────────────────────── Badges ─────────────────────────────── */
.badge-grade{padding:.34rem .72rem;border-radius:20px;color:#fff;font-weight:500;font-size:.78rem;white-space:nowrap;display:inline-block}
.badge-status{padding:.28rem .68rem;border-radius:20px;font-size:.76rem;font-weight:500;white-space:nowrap;display:inline-block}
.st-pending{background:#FEE2E2;color:#B91C1C}
.st-progress{background:#FEF3C7;color:#92400E}
.st-done{background:#DCFCE7;color:#15803D}
[data-theme="dark"] .st-pending{background:#4A1215;color:#FCA5A5}
[data-theme="dark"] .st-progress{background:#43310A;color:#FCD34D}
[data-theme="dark"] .st-done{background:#0F3320;color:#86EFAC}

/* ─────────────────────────────── Tables ─────────────────────────────── */
.table-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.table{margin:0;color:var(--ink);--bs-table-bg:transparent}
.table>thead th{
  background:var(--gray-100);color:var(--ink);font-weight:500;font-size:.83rem;
  border-bottom:1px solid var(--border);white-space:nowrap;padding:.72rem .8rem;position:sticky;top:0;z-index:2
}
.table>tbody td{padding:.68rem .8rem;vertical-align:middle;border-color:var(--border);font-size:.9rem}
.table>tbody tr:hover{background:var(--blue-50)}
[data-theme="dark"] .table>tbody tr:hover{background:rgba(37,99,235,.1)}
.table-scroll{max-height:64vh;overflow:auto}
.link-teacher{font-weight:500;color:var(--blue);cursor:pointer}
.link-teacher:hover{text-decoration:underline}

/* ────────────────────────── Evaluation form ─────────────────────────── */
.crit-section{margin-bottom:1.1rem}
.crit-section-head{
  background:var(--navy);color:#fff;padding:.6rem 1rem;border-radius:10px 10px 0 0;
  font-weight:500;display:flex;align-items:center;justify-content:space-between;gap:.5rem
}
.crit-item{
  border:1px solid var(--border);border-top:none;background:var(--card);padding:.75rem 1rem;
  display:grid;grid-template-columns:1fr auto;gap:.6rem 1rem;align-items:center
}
.crit-item:last-child{border-radius:0 0 10px 10px}
.crit-item.unanswered{background:#FFF7ED}
[data-theme="dark"] .crit-item.unanswered{background:#2A1D0E}
.crit-label{font-size:.92rem}
.crit-hint{font-size:.76rem;color:var(--gray-600);margin-top:.15rem}
.crit-note{grid-column:1/-1}
.score-group{display:flex;gap:.3rem;flex-wrap:nowrap}
.score-opt input{position:absolute;opacity:0;width:0;height:0}
.score-opt label{
  width:42px;height:42px;border-radius:11px;border:1.5px solid var(--border);background:var(--card);
  display:flex;align-items:center;justify-content:center;font-weight:600;cursor:pointer;
  transition:.13s;font-size:.95rem;margin:0
}
.score-opt label:hover{border-color:var(--blue);background:var(--blue-50)}
.score-opt input:checked + label{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 4px 10px rgba(37,99,235,.35)}
.score-opt input:focus-visible + label{outline:2px solid var(--blue);outline-offset:2px}
@media(max-width:575.98px){
  .crit-item{grid-template-columns:1fr}
  .score-opt label{width:100%;height:38px}
  .score-group{display:grid;grid-template-columns:repeat(5,1fr);gap:.25rem}
}

.score-summary{
  position:sticky;bottom:0;z-index:20;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:.9rem 1.1rem;box-shadow:0 -6px 22px -12px rgba(11,31,77,.35);
  display:flex;flex-wrap:wrap;align-items:center;gap:1rem
}
.score-summary .big{font-size:1.7rem;font-weight:700;line-height:1}
.progress-thin{height:8px;border-radius:6px;background:var(--gray-100)}

/* ────────────────────────────── Uploads ─────────────────────────────── */
.drop-zone{
  border:2px dashed var(--gray-200);border-radius:var(--radius);padding:1.4rem;text-align:center;
  cursor:pointer;transition:.15s;background:var(--gray-50)
}
.drop-zone:hover,.drop-zone.drag{border-color:var(--blue);background:var(--blue-50)}
.thumb-grid{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:.8rem}
.thumb{
  position:relative;width:130px;height:100px;border-radius:11px;overflow:hidden;
  border:1px solid var(--border);background:var(--gray-100);cursor:pointer
}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb .del{
  position:absolute;top:4px;right:4px;background:rgba(220,38,38,.92);color:#fff;border:none;
  width:24px;height:24px;border-radius:50%;font-size:.72rem;display:flex;align-items:center;justify-content:center
}
.thumb .bar{position:absolute;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);color:#fff;font-size:.66rem;padding:2px 5px;text-align:center}

/* ────────────────────────────── Timeline ────────────────────────────── */
.timeline{position:relative;padding-left:30px}
.timeline::before{content:'';position:absolute;left:9px;top:6px;bottom:6px;width:2px;background:var(--gray-200)}
.tl-item{position:relative;margin-bottom:1.1rem}
.tl-item::before{
  content:'';position:absolute;left:-26px;top:8px;width:14px;height:14px;border-radius:50%;
  background:var(--blue);border:3px solid var(--card);box-shadow:0 0 0 2px var(--blue)
}
.tl-round{font-weight:600;color:var(--navy);margin-bottom:.4rem}
[data-theme="dark"] .tl-round{color:#93B4F5}

/* ──────────────────────────────── Charts ────────────────────────────── */
.chart-box{position:relative;height:320px}
.chart-box.tall{height:420px}
.heat-table{border-collapse:separate;border-spacing:2px;font-size:.74rem;width:100%}
.heat-table td,.heat-table th{padding:.3rem;text-align:center;border-radius:5px;white-space:nowrap}
.heat-table th{background:var(--gray-100);font-weight:500}
.heat-table td.cell{color:#fff;font-weight:600;min-width:38px}
.heat-y{text-align:left !important;background:var(--gray-100);max-width:170px;overflow:hidden;text-overflow:ellipsis}

/* ────────────────────────────── Snackbar ────────────────────────────── */
.snackbar-wrap{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:3000;
  display:flex;flex-direction:column;gap:.5rem;width:min(94vw,440px)}
.snackbar{
  background:var(--ink);color:#fff;border-radius:12px;padding:.8rem 1rem;font-size:.9rem;
  box-shadow:0 12px 30px -10px rgba(0,0,0,.5);display:flex;align-items:center;gap:.6rem;
  animation:snackIn .28s cubic-bezier(.2,.9,.3,1.2)
}
.snackbar.ok{background:#15803D}
.snackbar.err{background:#B91C1C}
.snackbar.warn{background:#B45309}
.snackbar.info{background:var(--navy)}
@keyframes snackIn{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}

.loading-overlay{position:fixed;inset:0;background:rgba(255,255,255,.68);backdrop-filter:blur(2px);
  z-index:2500;display:flex;align-items:center;justify-content:center}
[data-theme="dark"] .loading-overlay{background:rgba(10,16,30,.7)}

/* ──────────────────────────── Form controls ─────────────────────────── */
.form-control,.form-select{
  border-radius:10px;border-color:var(--border);background:var(--card);color:var(--ink);
  padding:.5rem .75rem;font-size:.92rem
}
.form-control:focus,.form-select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.15);background:var(--card);color:var(--ink)}
.form-control::placeholder{color:var(--gray-400)}
.form-label{font-size:.85rem;font-weight:500;margin-bottom:.28rem;color:var(--gray-600)}
.input-group-text{background:var(--gray-100);border-color:var(--border);color:var(--gray-600)}
.btn{border-radius:10px;font-size:.92rem;font-weight:500}
.btn-primary{background:var(--blue);border-color:var(--blue)}
.btn-primary:hover,.btn-primary:focus{background:#1D4ED8;border-color:#1D4ED8}
.btn-navy{background:var(--navy);border-color:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-700);color:#fff}
.btn-sm{font-size:.82rem;padding:.28rem .6rem}
.modal-content{background:var(--card);color:var(--ink);border-radius:var(--radius);border-color:var(--border)}
.modal-header,.modal-footer{border-color:var(--border)}
.dropdown-menu{background:var(--card);border-color:var(--border);border-radius:12px;box-shadow:var(--shadow)}
.dropdown-item{color:var(--ink)}
.dropdown-item:hover{background:var(--gray-100);color:var(--ink)}
.nav-tabs{border-color:var(--border)}
.nav-tabs .nav-link{color:var(--gray-600);border:none;border-bottom:2px solid transparent;border-radius:0}
.nav-tabs .nav-link.active{color:var(--blue);background:transparent;border-bottom-color:var(--blue);font-weight:500}
.alert{border-radius:12px;border:none}
.empty{text-align:center;padding:2.6rem 1rem;color:var(--gray-400)}
.empty i{font-size:2.6rem;display:block;margin-bottom:.5rem;opacity:.55}

.filter-bar{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:.8rem 1rem;box-shadow:var(--shadow);margin-bottom:1rem
}
.pagination .page-link{color:var(--blue);border-color:var(--border);background:var(--card)}
.pagination .page-item.active .page-link{background:var(--blue);border-color:var(--blue);color:#fff}

.offline-badge{
  position:fixed;bottom:18px;left:18px;z-index:2900;background:var(--warn);color:#fff;
  padding:.4rem .8rem;border-radius:20px;font-size:.78rem;box-shadow:var(--shadow)
}

@media print{
  .topbar,.sidebar,.snackbar-wrap,.no-print{display:none !important}
  .content{margin:0;padding:0}
  body{background:#fff}
}