:root{
  --bg:#f6f7fb;
  --surface:#ffffff;
  --surface-2:#fafafa;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --primary:#111827;
  --primary-2:#1f2937;
  --success:#065f46;
  --success-bg:#ecfdf5;
  --success-border:#a7f3d0;
  --danger:#991b1b;
  --danger-bg:#fef2f2;
  --danger-border:#fecaca;
  --warning:#92400e;
  --warning-bg:#fffbeb;
  --warning-border:#fde68a;
  --radius:16px;
  --shadow:0 8px 24px rgba(17,24,39,.06);
}

*{ box-sizing:border-box; }

html,body{
  margin:0;
  padding:0;
}

body{
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  line-height:1.5;
}

a{
  color:var(--primary);
  text-decoration:none;
}

a:hover{ opacity:.85; }

h1,h2,h3{
  margin:0 0 12px;
  color:var(--text);
  line-height:1.15;
}

h1{
  font-size:clamp(2rem, 4vw, 2.75rem);
  font-weight:750;
  letter-spacing:-.03em;
}

h2{
  font-size:1.4rem;
  font-weight:700;
}

p{
  margin:0 0 14px;
  color:var(--muted);
}

.container{
  width:min(1180px, calc(100% - 32px));
  margin:32px auto;
}

.narrow{ width:min(520px, calc(100% - 32px)); }

.topbar{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 24px;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}

.topbar .brand{
  font-size:1.1rem;
  font-weight:750;
  color:var(--text);
}

.topbar nav{
  display:flex;
  align-items:center;
  gap:12px;
}

.topbar nav a{
  color:var(--muted);
  font-weight:500;
}

.topbar nav a:hover{ color:var(--text); }

.card,
.login-card,
.panel,
.public-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.card,
.panel,
.public-card{ padding:24px; }

.login-page{
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:24px;
}

.login-card{
  width:min(420px, 100%);
  padding:32px 24px;
}

.login-card h1{
  margin-bottom:4px;
  font-size:1.8rem;
}

.login-card p{ margin-bottom:18px; }

.stack{
  display:grid;
  gap:16px;
}

label{
  display:grid;
  gap:8px;
  font-size:.95rem;
  font-weight:600;
  color:var(--text);
}

input,
select,
textarea{
  width:100%;
  border:1px solid var(--border);
  background:#fff;
  color:var(--text);
  border-radius:12px;
  padding:13px 14px;
  outline:none;
  font-size:15px;
  transition:border-color .2s ease, box-shadow .2s ease;
}

input::placeholder,
textarea::placeholder{ color:#9ca3af; }

input:focus,
select:focus,
textarea:focus{
  border-color:#9ca3af;
  box-shadow:0 0 0 3px rgba(17,24,39,.08);
}

textarea{
  min-height:110px;
  resize:vertical;
}

input[type="file"]{
  background:#fff;
  padding:10px;
}

.btn,
button{
  appearance:none;
  border:none;
  border-radius:12px;
  cursor:pointer;
  font-weight:650;
  transition:.2s ease;
}

.btn,
button,
.admin-btn,
.mini-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:12px 16px;
}

.btn.primary,
button.primary,
.admin-btn.primary{
  background:var(--primary);
  color:#fff;
}

.btn.primary:hover,
button.primary:hover,
.admin-btn.primary:hover{ background:var(--primary-2); }

.btn.secondary,
.admin-btn.secondary,
.mini-btn{
  background:#fff;
  color:var(--text);
  border:1px solid var(--border);
}

.btn.secondary:hover,
.admin-btn.secondary:hover,
.mini-btn:hover{ background:#f9fafb; }

.alert{
  border-radius:12px;
  padding:14px 16px;
  margin:0 0 18px;
  font-weight:500;
  border:1px solid transparent;
}

.alert.success{
  background:var(--success-bg);
  border-color:var(--success-border);
  color:var(--success);
}

.alert.error{
  background:var(--danger-bg);
  border-color:var(--danger-border);
  color:var(--danger);
}

.alert.warning{
  background:var(--warning-bg);
  border-color:var(--warning-border);
  color:var(--warning);
}

.table-wrap{ overflow:auto; }

table{
  width:100%;
  border-collapse:collapse;
  background:#fff;
}

th, td{
  text-align:left;
  padding:14px 12px;
  border-bottom:1px solid var(--border);
  vertical-align:middle;
}

th{
  color:#374151;
  font-size:.9rem;
  font-weight:700;
  background:#fafafa;
}

td{
  color:#111827;
  font-size:.95rem;
}

.actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}

hr{
  border:none;
  border-top:1px solid var(--border);
  margin:22px 0;
}

/* Public download page */
.public-shell{
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:32px 18px;
}

.public-card{
  width:min(720px, 100%);
  padding:0;
  overflow:hidden;
}

.public-header{
  padding:26px 28px;
  border-bottom:1px solid var(--border);
  display:flex;
  align-items:center;
  gap:14px;
  background:#fff;
}

.public-logo{
  width:46px;
  height:46px;
  border-radius:14px;
  background:#111827;
  color:#fff;
  display:grid;
  place-items:center;
  font-weight:800;
}

.public-brand strong{
  display:block;
  color:#111827;
  font-size:1rem;
}

.public-brand span{
  display:block;
  color:#6b7280;
  font-size:.92rem;
  margin-top:2px;
}

.public-body{
  padding:30px 28px;
}

.file-type{
  display:inline-flex;
  align-items:center;
  padding:6px 10px;
  border-radius:999px;
  background:#f3f4f6;
  color:#374151;
  border:1px solid #e5e7eb;
  font-size:.8rem;
  font-weight:700;
  margin-bottom:14px;
}

.public-title{
  margin:0 0 8px;
  font-size:clamp(2rem, 5vw, 3.3rem);
  letter-spacing:-.04em;
}

.public-project{
  color:#6b7280;
  margin-bottom:22px;
}

.public-note{
  background:#f9fafb;
  border:1px solid #e5e7eb;
  border-radius:14px;
  padding:14px 16px;
  margin-bottom:22px;
  color:#374151;
}

.file-details{
  display:grid;
  gap:10px;
  margin-bottom:22px;
}

.file-detail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:14px 16px;
  background:#fafafa;
  border:1px solid #e5e7eb;
  border-radius:14px;
}

.file-detail span{
  color:#6b7280;
}

.file-detail strong{
  color:#111827;
  text-align:right;
}

.public-download-button{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
  border-radius:14px;
  background:#111827;
  color:#fff;
  font-weight:750;
  text-decoration:none;
}

.public-download-button:hover{
  background:#1f2937;
  opacity:1;
}

.public-footer{
  padding:18px 28px;
  border-top:1px solid #e5e7eb;
  color:#6b7280;
  font-size:.92rem;
  background:#fafafa;
}

@media (max-width: 768px){
  .topbar{
    flex-direction:column;
    align-items:flex-start;
  }

  .container{
    width:min(100%, calc(100% - 20px));
    margin:20px auto;
  }

  .card,
  .panel,
  .public-card,
  .login-card{
    padding:18px;
  }

  .public-card{ padding:0; }

  .public-header,
  .public-body,
  .public-footer{
    padding-left:20px;
    padding-right:20px;
  }

  .file-detail{
    align-items:flex-start;
    flex-direction:column;
  }

  .file-detail strong{
    text-align:left;
  }
}