@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
@import url('https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css');

:root {
  --bg:          #0a0a0f;
  --bg2:         #0f0f1a;
  --glass:       rgba(255,255,255,0.05);
  --glass-hover: rgba(255,255,255,0.09);
  --border:      rgba(255,255,255,0.10);
  --border-h:    rgba(255,255,255,0.20);
  --accent:      #7c3aed;
  --accent2:     #06b6d4;
  --success:     #10b981;
  --warn:        #f59e0b;
  --danger:      #ef4444;
  --text:        #f0f0ff;
  --muted:       rgba(240,240,255,0.45);
  --rad:         16px;
  --rad-sm:      10px;
  --shadow:      0 8px 32px rgba(0,0,0,0.45);
  --transition:  all .2s cubic-bezier(.4,0,.2,1);
}

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

html,body{
  height:100%;font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI Variable',sans-serif;
  background:var(--bg);color:var(--text);overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:'';position:fixed;inset:0;z-index:-1;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%,rgba(124,58,237,.18) 0%,transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 80%,rgba(6,182,212,.14) 0%,transparent 55%),
    radial-gradient(ellipse 50% 40% at 50% 50%,rgba(16,185,129,.07) 0%,transparent 60%);
}

/* ── Scrollbar ─────────────────────────────────────── */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.15);border-radius:99px}

/* ── Glass card ────────────────────────────────────── */
.card{
  background:var(--glass);
  backdrop-filter:blur(24px) saturate(1.4);
  -webkit-backdrop-filter:blur(24px) saturate(1.4);
  border:1px solid var(--border);
  border-radius:var(--rad);
  transition:var(--transition);
}
.card:hover{border-color:var(--border-h);box-shadow:var(--shadow)}

/* ── Layout ────────────────────────────────────────── */
#app{display:flex;flex-direction:column;min-height:100vh}
.header{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;gap:12px;padding:12px 24px;
  background:rgba(10,10,15,.7);backdrop-filter:blur(30px);
  border-bottom:1px solid var(--border);
}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;letter-spacing:-.3px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.logo i{font-size:1.3rem;-webkit-text-fill-color:var(--accent)}

.disk-bar-wrap{flex:1;max-width:320px;margin-left:auto}
.disk-label{font-size:.7rem;color:var(--muted);margin-bottom:4px;display:flex;justify-content:space-between}
.disk-track{height:6px;background:rgba(255,255,255,.08);border-radius:99px;overflow:hidden}
.disk-fill{height:100%;border-radius:99px;transition:width 1s ease;
  background:linear-gradient(90deg,var(--accent2),var(--accent))}

.user-badge{display:flex;align-items:center;gap:8px;padding:6px 14px;background:var(--glass);
  border:1px solid var(--border);border-radius:99px;font-size:.82rem;cursor:pointer;transition:var(--transition)}
.user-badge:hover{border-color:var(--border-h)}
.role-pill{font-size:.65rem;padding:2px 8px;border-radius:99px;font-weight:600;letter-spacing:.5px}
.role-admin{background:rgba(124,58,237,.25);color:#b8a0ff}
.role-user{background:rgba(6,182,212,.20);color:#67e8f9}

.main{flex:1;padding:24px;max-width:1100px;width:100%;margin:0 auto}

/* ── Login ─────────────────────────────────────────── */
#login-screen{
  display:flex;align-items:center;justify-content:center;min-height:100vh;
  background:var(--bg);
}
.login-box{width:360px;padding:40px;text-align:center}
.login-box h2{font-size:1.5rem;font-weight:700;margin-bottom:6px}
.login-box p{color:var(--muted);font-size:.85rem;margin-bottom:28px}
.form-group{margin-bottom:14px;text-align:left}
.form-group label{font-size:.78rem;color:var(--muted);margin-bottom:5px;display:block}
.form-group input,select,textarea{
  width:100%;padding:10px 14px;background:rgba(255,255,255,.06);border:1px solid var(--border);
  border-radius:var(--rad-sm);color:var(--text);font-size:.9rem;font-family:inherit;outline:none;transition:var(--transition);
}
.form-group input:focus,.form-group input:focus-within,input:focus,select:focus,textarea:focus{
  border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,58,237,.2)
}

/* ── Buttons ───────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;gap:7px;padding:9px 20px;border:none;border-radius:var(--rad-sm);
  font-size:.875rem;font-weight:500;font-family:inherit;cursor:pointer;transition:var(--transition);text-decoration:none;
}
.btn-primary{background:linear-gradient(135deg,var(--accent),#5b21b6);color:#fff}
.btn-primary:hover{opacity:.9;transform:translateY(-1px);box-shadow:0 4px 20px rgba(124,58,237,.4)}
.btn-cyan{background:linear-gradient(135deg,var(--accent2),#0891b2);color:#fff}
.btn-cyan:hover{opacity:.9;transform:translateY(-1px)}
.btn-ghost{background:var(--glass);border:1px solid var(--border);color:var(--text)}
.btn-ghost:hover{background:var(--glass-hover);border-color:var(--border-h)}
.btn-danger{background:rgba(239,68,68,.15);border:1px solid rgba(239,68,68,.3);color:#fca5a5}
.btn-danger:hover{background:rgba(239,68,68,.25)}
.btn-success{background:rgba(16,185,129,.15);border:1px solid rgba(16,185,129,.3);color:#6ee7b7}
.btn-success:hover{background:rgba(16,185,129,.25)}
.btn-sm{padding:5px 12px;font-size:.78rem;border-radius:8px}
.btn-full{width:100%;justify-content:center}
.btn-icon{padding:7px;border-radius:8px;background:var(--glass);border:1px solid var(--border);color:var(--muted);cursor:pointer;transition:var(--transition)}
.btn-icon:hover{color:var(--text);border-color:var(--border-h)}

/* ── Tabs / Segmented Control ──────────────────────── */
.tabs{display:flex;gap:4px;background:rgba(255,255,255,.05);border:1px solid var(--border);padding:4px;border-radius:12px;margin-bottom:24px}
.tab{flex:1;padding:8px;text-align:center;border-radius:9px;cursor:pointer;font-size:.83rem;font-weight:500;color:var(--muted);transition:var(--transition);border:none;background:transparent;font-family:inherit}
.tab.active{background:var(--accent);color:#fff;box-shadow:0 2px 12px rgba(124,58,237,.35)}
.tab:hover:not(.active){color:var(--text);background:rgba(255,255,255,.07)}

.seg-ctrl{display:inline-flex;gap:3px;background:rgba(255,255,255,.05);border:1px solid var(--border);padding:3px;border-radius:10px}
.seg-btn{padding:6px 16px;border:none;border-radius:7px;background:transparent;color:var(--muted);font-size:.8rem;font-weight:500;font-family:inherit;cursor:pointer;transition:var(--transition)}
.seg-btn.active{background:rgba(124,58,237,.7);color:#fff;box-shadow:0 2px 8px rgba(124,58,237,.3)}
.seg-btn:hover:not(.active){background:rgba(255,255,255,.08);color:var(--text)}

/* ── Search ────────────────────────────────────────── */
.search-hero{text-align:center;margin-bottom:32px}
.search-hero h1{font-size:2rem;font-weight:700;letter-spacing:-.5px;margin-bottom:8px;
  background:linear-gradient(135deg,#fff 30%,rgba(255,255,255,.5));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.search-hero p{color:var(--muted);font-size:.9rem;margin-bottom:28px}
.search-wrap{position:relative;max-width:620px;margin:0 auto}
.search-wrap i{position:absolute;left:18px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:1.2rem;pointer-events:none}
#search-input{
  width:100%;padding:16px 18px 16px 50px;font-size:1rem;font-family:inherit;
  background:rgba(255,255,255,.07);border:1px solid var(--border);border-radius:14px;
  color:var(--text);outline:none;transition:var(--transition);
}
#search-input:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(124,58,237,.18);background:rgba(255,255,255,.10)}
#search-input::placeholder{color:var(--muted)}

/* ── Topic cards ───────────────────────────────────── */
.topics-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.topic-card{padding:18px;cursor:pointer;transition:var(--transition)}
.topic-card:hover{transform:translateY(-3px);box-shadow:0 12px 40px rgba(0,0,0,.5);border-color:rgba(124,58,237,.4)}
.topic-card h3{font-size:.93rem;font-weight:600;margin-bottom:8px;line-height:1.4}
.topic-meta{display:flex;gap:10px;flex-wrap:wrap}
.badge{display:inline-flex;align-items:center;gap:4px;font-size:.7rem;padding:2px 8px;border-radius:99px;font-weight:500}
.badge-muted{background:rgba(255,255,255,.08);color:var(--muted)}
.badge-success{background:rgba(16,185,129,.2);color:#6ee7b7}
.badge-accent{background:rgba(124,58,237,.2);color:#c4b5fd}
.badge-cyan{background:rgba(6,182,212,.2);color:#67e8f9}
.badge-warn{background:rgba(245,158,11,.2);color:#fcd34d}
.badge-danger{background:rgba(239,68,68,.2);color:#fca5a5}

/* ── Quick toolbar ─────────────────────────────────── */
.quick-toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.pill-btn{padding:5px 14px;border:1px solid var(--border);border-radius:99px;background:var(--glass);
  color:var(--muted);font-size:.75rem;cursor:pointer;transition:var(--transition);font-family:inherit}
.pill-btn:hover{border-color:var(--accent);color:var(--text);background:rgba(124,58,237,.1)}

/* ── File row ──────────────────────────────────────── */
.file-row{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;transition:var(--transition);border:1px solid transparent}
.file-row:hover{background:rgba(255,255,255,.04);border-color:var(--border)}
.file-row input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer;flex-shrink:0}
.file-name{flex:1;font-size:.82rem;word-break:break-all;color:var(--text)}
.server-badge{font-size:.68rem;padding:2px 8px;border-radius:99px;background:rgba(16,185,129,.2);color:#6ee7b7;border:1px solid rgba(16,185,129,.3);white-space:nowrap;flex-shrink:0}

/* ── Progress bars ─────────────────────────────────── */
.progress-track{height:6px;background:rgba(255,255,255,.08);border-radius:99px;overflow:hidden;margin:6px 0}
.progress-fill{height:100%;border-radius:99px;transition:width .8s ease;
  background:linear-gradient(90deg,var(--accent2),var(--accent))}
.progress-fill.done{background:linear-gradient(90deg,var(--success),#059669)}
.progress-fill.error{background:var(--danger)}

/* ── Download queue card ───────────────────────────── */
.dl-card{padding:14px 16px;margin-bottom:8px}
.dl-card-header{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.dl-filename{flex:1;font-size:.83rem;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dl-meta{display:flex;gap:12px;font-size:.73rem;color:var(--muted)}
.dl-controls{display:flex;gap:6px;flex-shrink:0}

/* ── Admin ─────────────────────────────────────────── */
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.settings-grid{grid-template-columns:1fr}}
.settings-section{padding:20px}
.settings-section h3{font-size:.88rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.8px;margin-bottom:14px;display:flex;align-items:center;gap:6px}
.form-row{margin-bottom:12px}
.form-row label{display:block;font-size:.75rem;color:var(--muted);margin-bottom:4px}
.form-row input,.form-row select{
  width:100%;padding:8px 12px;background:rgba(255,255,255,.06);border:1px solid var(--border);
  border-radius:8px;color:var(--text);font-size:.84rem;font-family:inherit;outline:none;transition:var(--transition)
}
.form-row input:focus,.form-row select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,58,237,.18)}

.users-table{width:100%;border-collapse:collapse;font-size:.83rem}
.users-table th{text-align:left;padding:10px 12px;color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border)}
.users-table td{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.05)}
.users-table tr:hover td{background:rgba(255,255,255,.03)}

/* ── Toast ─────────────────────────────────────────── */
#toast-container{position:fixed;bottom:24px;right:24px;z-index:9999;display:flex;flex-direction:column;gap:10px;pointer-events:none}
.toast{
  display:flex;align-items:center;gap:10px;padding:12px 18px;border-radius:12px;min-width:260px;max-width:360px;
  backdrop-filter:blur(20px);border:1px solid var(--border);box-shadow:var(--shadow);
  animation:slideIn .3s cubic-bezier(.4,0,.2,1) forwards;pointer-events:all;font-size:.85rem;
}
.toast.out{animation:slideOut .3s ease forwards}
.toast-success{background:rgba(16,185,129,.18);border-color:rgba(16,185,129,.3)}
.toast-error{background:rgba(239,68,68,.18);border-color:rgba(239,68,68,.3)}
.toast-info{background:rgba(6,182,212,.15);border-color:rgba(6,182,212,.3)}
.toast i{font-size:1rem;flex-shrink:0}
.toast-success i{color:var(--success)}
.toast-error i{color:var(--danger)}
.toast-info i{color:var(--accent2)}

@keyframes slideIn{from{transform:translateX(120%);opacity:0}to{transform:translateX(0);opacity:1}}
@keyframes slideOut{from{transform:translateX(0);opacity:1}to{transform:translateX(120%);opacity:0}}

/* ── Panel ─────────────────────────────────────────── */
.panel{display:none}.panel.active{display:block}
.panel-title{font-size:1.1rem;font-weight:700;margin-bottom:18px;display:flex;align-items:center;gap:8px}

/* ── Skeleton loader ───────────────────────────────── */
.skeleton{background:linear-gradient(90deg,rgba(255,255,255,.05) 25%,rgba(255,255,255,.1) 50%,rgba(255,255,255,.05) 75%);
  background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:8px}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ── Empty / loading states ────────────────────────── */
.empty-state{text-align:center;padding:60px 20px;color:var(--muted)}
.empty-state i{font-size:3rem;margin-bottom:12px;opacity:.4;display:block}
.empty-state p{font-size:.9rem}

.spinner{display:inline-block;width:20px;height:20px;border:2px solid rgba(255,255,255,.15);
  border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Misc ──────────────────────────────────────────── */
.divider{border:none;border-top:1px solid var(--border);margin:16px 0}
.text-muted{color:var(--muted)}
.text-sm{font-size:.8rem}
.mt-8{margin-top:8px}
.mt-16{margin-top:16px}
.flex{display:flex}.gap-8{gap:8px}.gap-12{gap:12px}.items-center{align-items:center}
.justify-between{justify-content:space-between}
.w-full{width:100%}
.input-full{width:100%;padding:10px 14px;background:rgba(255,255,255,.06);border:1px solid var(--border);
  border-radius:var(--rad-sm);color:var(--text);font-size:.9rem;font-family:inherit;outline:none;transition:var(--transition)}
.input-full:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,58,237,.2)}