*{box-sizing:border-box}

:root{
  --ink:#251744;
  --ink-soft:#4d405a;
  --purple:#642cc6;
  --pink:#f30b73;
  --orange:#ff7a1a;
  --bg:#f6f4f8;
  --line:#e6deec;
  --line-strong:#d9cfe1;
  --muted:#766e86;
  --white:#fff;
  --shadow:0 12px 32px rgba(43,24,70,.055);
}

html{-webkit-text-size-adjust:100%}
html,body{margin:0;min-height:100%;max-width:100%;overflow-x:hidden}
body{
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.48;
}
a{text-decoration:none;color:inherit}
button,input,select,textarea{font:inherit}
img{max-width:100%}

/* ===== Admin shell ===== */
.admin-layout{
  min-height:100vh;
  display:grid;
  grid-template-columns:230px minmax(0,1fr);
}

.sidebar{
  position:sticky;
  top:0;
  height:100vh;
  padding:20px 14px;
  display:flex;
  flex-direction:column;
  background:#251744;
  color:#fff;
  z-index:40;
}

.sidebar-logo{
  width:auto;
  height:58px;
  object-fit:contain;
  display:block;
  margin:0 auto 18px;
}

.sidebar nav{
  display:grid;
  gap:4px;
  min-height:0;
  overflow-y:auto;
  scrollbar-width:thin;
}

.sidebar nav a{
  min-height:42px;
  padding:10px 12px;
  display:flex;
  align-items:center;
  border-radius:10px;
  color:#e8e0f2;
  font-size:13px;
  font-weight:700;
  line-height:1.25;
}

.sidebar nav a:hover,
.sidebar nav a.active{
  background:rgba(255,255,255,.11);
  color:#fff;
}

.sidebar .logout{
  margin-top:auto;
  flex:0 0 auto;
}

.main{
  min-width:0;
  width:100%;
  padding:28px;
}

/* ===== Page headings ===== */
.top{
  margin-bottom:20px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
}
.top>div{min-width:0}
.top h1{
  margin:0;
  font-size:29px;
  line-height:1.15;
  letter-spacing:-.035em;
}
.muted{
  color:var(--muted);
  line-height:1.5;
  word-break:break-word;
}
.top .muted{margin-top:4px;font-size:13px}

/* ===== Cards / panels ===== */
.cards{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:13px;
}
.stat{
  min-width:0;
  padding:18px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  box-shadow:0 5px 18px rgba(43,24,70,.035);
}
.stat b{
  display:block;
  margin-top:4px;
  font-size:27px;
  line-height:1.05;
}

.panel{
  width:100%;
  max-width:100%;
  margin-top:16px;
  padding:20px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:17px;
  box-shadow:var(--shadow);
}

.panel-head{
  margin-bottom:14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}
.panel h2{
  margin:0;
  font-size:19px;
  line-height:1.25;
}

/* ===== Tables ===== */
.table-scroll{
  width:100%;
  max-width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
table{
  width:100%;
  border-collapse:collapse;
}
.table-scroll table{min-width:720px}
th,td{
  padding:12px 11px;
  border-bottom:1px solid var(--line);
  text-align:left;
  vertical-align:top;
  font-size:13px;
}
th{
  color:var(--muted);
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:.045em;
  white-space:nowrap;
}
tr:last-child td{border-bottom:0}

/* ===== Buttons ===== */
.btn{
  min-height:40px;
  border:0;
  border-radius:10px;
  padding:9px 13px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  cursor:pointer;
  font-weight:800;
  font-size:13px;
  line-height:1.2;
}
.primary{
  color:#fff;
  background:linear-gradient(135deg,var(--purple),var(--pink),var(--orange));
  box-shadow:0 7px 17px rgba(100,44,198,.13);
}
.light{
  color:var(--ink);
  background:#fff;
  border:1px solid var(--line);
}
.danger{
  color:#b21350;
  background:#fff0f4;
  border:1px solid #ffd4e3;
}
.small{
  min-height:34px;
  padding:7px 9px;
  font-size:11.5px;
}
.action-row{
  display:flex;
  align-items:center;
  gap:6px;
  flex-wrap:wrap;
}
.action-row input[type=file]{
  max-width:250px;
}

/* ===== Forms ===== */
.form-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:15px;
}
.full{grid-column:1/-1}

label{
  display:block;
  margin-bottom:7px;
  color:#35293f;
  font-size:12.5px;
  font-weight:800;
}

input[type=text],
input[type=password],
input[type=email],
input[type=number],
input[type=file],
select,
textarea{
  width:100%;
  max-width:100%;
  min-height:46px;
  padding:11px 12px;
  border:1px solid var(--line-strong);
  border-radius:11px;
  background:#fff;
  color:var(--ink);
  outline:none;
  font-size:16px;
}

input[type=file]{
  padding:8px 10px;
  min-height:46px;
}

textarea{
  min-height:105px;
  resize:vertical;
}

input:focus,
select:focus,
textarea:focus{
  border-color:#8c55d1;
  box-shadow:0 0 0 4px rgba(100,44,198,.08);
}

input:disabled{
  background:#f3f0f5;
  color:#82798b;
}

.flash{
  padding:12px 14px;
  margin-bottom:14px;
  border-radius:11px;
  background:#f0e8ff;
  color:#52347a;
  font-size:13px;
  line-height:1.5;
}
.flash.error{
  background:#fff0f4;
  color:#a4154a;
}

.code,
.share-link{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:11.5px;
  word-break:break-all;
}
.code{
  padding:4px 7px;
  border-radius:7px;
  background:#f5f1fa;
}

/* ===== Activity entry-mode cards ===== */
.entry-mode-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:9px;
  margin-top:6px;
}
.entry-mode-card{
  position:relative;
  display:block;
  margin:0;
  cursor:pointer;
}
.entry-mode-card input{
  position:absolute;
  opacity:0;
  pointer-events:none;
}
.entry-mode-box{
  height:100%;
  padding:13px;
  border:1px solid #e1d8e9;
  border-radius:12px;
  background:#fff;
  transition:.15s ease;
}
.entry-mode-box strong{
  display:block;
  margin-bottom:4px;
  color:#352344;
  font-size:12.5px;
}
.entry-mode-box span{
  display:block;
  color:#7d7388;
  font-size:11.5px;
  line-height:1.45;
  font-weight:500;
}
.entry-mode-card input:checked + .entry-mode-box{
  border-color:#7d49c3;
  background:#f7f2fc;
  box-shadow:0 0 0 3px rgba(100,44,198,.07);
}
.entry-mode-card input:checked + .entry-mode-box strong{color:#5a2698}
.setting-note{
  margin-top:9px;
  padding:10px 12px;
  border-radius:10px;
  background:#f8f5fa;
  color:#706679;
  font-size:11.5px;
  line-height:1.5;
}

/* ===== Certificate preview ===== */
.cert-preview-shell{
  width:100%;
  overflow:hidden;
  padding:10px;
  border-radius:13px;
  background:#eeeaf0;
}
.cert-preview{
  position:relative;
  width:min(100%,1000px);
  margin:auto;
  aspect-ratio:297/210;
  overflow:hidden;
  background:#fff;
}
.cert-preview-label{
  position:absolute;
  transform:translate(-50%,-50%);
  white-space:nowrap;
  text-align:center;
  transform-origin:center;
}

/* ===== Login / registration ===== */
.login-page{
  min-height:100vh;
  padding:24px;
  display:grid;
  place-items:center;
  background:
    radial-gradient(circle at 10% 10%,#fff0c7,transparent 27%),
    radial-gradient(circle at 90% 15%,#ffd9e8,transparent 28%),
    #f8f5ff;
}
.login-card{
  width:min(440px,100%);
  padding:27px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:21px;
  box-shadow:0 22px 56px rgba(58,25,91,.13);
}
.login-logo{
  width:auto;
  height:78px;
  display:block;
  margin:0 auto 18px;
  object-fit:contain;
}
.login-card h1{
  margin:0 0 6px;
  text-align:center;
  font-size:27px;
  letter-spacing:-.03em;
}
.login-card>p{
  margin:0 0 21px;
  text-align:center;
  color:var(--muted);
  font-size:13.5px;
  line-height:1.55;
}
.stack{display:grid;gap:13px}

/* ===== Medium desktop ===== */
@media(max-width:1180px){
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ===== Tablet ===== */
@media(max-width:900px){
  .admin-layout{display:block}

  .sidebar{
    position:sticky;
    top:0;
    height:auto;
    min-height:64px;
    padding:8px 10px;
    display:flex;
    flex-direction:row;
    align-items:center;
    gap:9px;
    overflow-x:auto;
    overflow-y:hidden;
    scrollbar-width:none;
    box-shadow:0 8px 24px rgba(35,19,66,.13);
  }
  .sidebar::-webkit-scrollbar{display:none}
  .sidebar-logo{
    height:48px;
    margin:0 4px 0 0;
    flex:0 0 auto;
  }
  .sidebar nav{
    display:flex;
    flex-direction:row;
    gap:5px;
    overflow:visible;
    flex:0 0 auto;
  }
  .sidebar nav a{
    min-height:40px;
    padding:9px 10px;
    white-space:nowrap;
    font-size:12px;
  }
  .sidebar .logout{
    margin:0 0 0 2px;
    flex:0 0 auto;
    white-space:nowrap;
  }

  .main{padding:20px 16px 30px}
  .top{margin-bottom:16px}
  .top h1{font-size:26px}

  .panel{
    padding:16px;
    border-radius:15px;
  }

  .form-grid{grid-template-columns:1fr}
  .full{grid-column:auto}
  .entry-mode-grid{grid-template-columns:1fr}
}

/* ===== Phone ===== */
@media(max-width:560px){
  .sidebar{min-height:58px;padding:6px 8px}
  .sidebar-logo{height:42px}
  .sidebar nav a{
    min-height:38px;
    padding:8px 9px;
    font-size:11.5px;
  }
  .sidebar .logout{
    min-height:38px;
    padding:8px 9px;
    font-size:11.5px;
  }

  .main{padding:14px 10px 25px}
  .top{
    align-items:stretch;
    flex-direction:column;
    gap:9px;
  }
  .top h1{font-size:23px}
  .top>.btn,
  .top>form,
  .top>.action-row{
    width:100%;
  }
  .top>.btn{width:100%}

  .cards{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:9px;
  }
  .stat{padding:13px}
  .stat b{font-size:22px}

  .panel{
    padding:13px;
    border-radius:14px;
    margin-top:12px;
  }
  .panel-head{
    align-items:flex-start;
    flex-direction:column;
    gap:8px;
  }

  .btn{min-height:44px}
  .small{min-height:38px}

  .action-row{
    align-items:stretch;
  }
  .action-row input[type=file]{
    flex:1 1 100%;
    max-width:100%;
  }

  .login-page{padding:14px}
  .login-card{
    padding:21px 17px;
    border-radius:18px;
  }
  .login-logo{height:66px;margin-bottom:15px}
  .login-card h1{font-size:24px}

  .table-scroll table{min-width:650px}
}

@media(max-width:380px){
  .cards{grid-template-columns:1fr}
  .sidebar-logo{height:39px}
}