/* ═══════════════════════════════════════════════════
   Exalyte — main.css
   Shared styles for all pages
   ═══════════════════════════════════════════════════ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@300;400;500;600;700;800;900&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500;700&display=swap');

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

/* ── Themes ── */
:root,[data-theme="dark"]{
  --bg:#05050a;--surface:#0a0a16;--surface2:#111122;--surface3:#16162a;
  --border:#1e1e38;--accent:#6366f1;--accent2:#818cf8;--accent3:#4f46e5;
  --text:#e9e9f0;--text-bright:#f5f5ff;--muted:#7c7c96;
  --error:#ef4444;--success:#22c55e;--warning:#f59e0b;
  --premium:#a855f7;--live:#ef4444;
  --shadow:rgba(0,0,0,.5);
  --card-hover:rgba(99,102,241,.06);
}
[data-theme="light"]{
  --bg:#f4f4f8;--surface:#ffffff;--surface2:#f0f0f6;--surface3:#e8e8f0;
  --border:#d8d8e8;--accent:#6366f1;--accent2:#4f46e5;--accent3:#4338ca;
  --text:#2d2d3d;--text-bright:#111128;--muted:#7c7c96;
  --error:#dc2626;--success:#16a34a;--warning:#d97706;
  --premium:#9333ea;--live:#dc2626;
  --shadow:rgba(0,0,0,.12);
  --card-hover:rgba(99,102,241,.04);
}

/* ── Base ── */
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--text);
  font-family:'Inter',sans-serif;min-height:100vh;
  transition:background .25s,color .25s;
}
a{color:inherit;text-decoration:none}
button{cursor:pointer;font-family:'Inter',sans-serif}
img{max-width:100%;display:block}

/* ── Typography ── */
.font-lex{font-family:'Lexend',sans-serif}
.font-mono{font-family:'JetBrains Mono',monospace}

/* ── Logo ── */
.logo-wrap{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo-img{width:32px;height:32px;border-radius:8px;object-fit:cover}
.logo-img-sm{width:24px;height:24px;border-radius:6px;object-fit:cover}
.logo-text{font-family:'Lexend',sans-serif;font-weight:700;font-size:1.1rem;color:var(--text-bright);letter-spacing:-.02em}
.logo-text-sm{font-family:'Lexend',sans-serif;font-weight:700;font-size:.95rem;color:var(--text-bright)}
.logo-fallback{width:32px;height:32px;background:linear-gradient(135deg,var(--accent),var(--accent3));border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.logo-fallback svg{width:18px;height:18px;fill:none;stroke:white;stroke-width:2}

/* ── Buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:10px;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s;font-family:'Inter',sans-serif;white-space:nowrap;text-decoration:none}
.btn svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2.5;flex-shrink:0}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent3));color:#fff;padding:10px 22px}
.btn-primary:hover{opacity:.9;transform:translateY(-1px);box-shadow:0 6px 20px rgba(99,102,241,.35)}
.btn-secondary{background:var(--surface2);border:1px solid var(--border);color:var(--text);padding:9px 20px}
.btn-secondary:hover{border-color:var(--accent2);color:var(--accent2)}
.btn-danger{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);color:var(--error);padding:8px 16px}
.btn-danger:hover{background:rgba(239,68,68,.2)}
.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text);padding:9px 20px}
.btn-ghost:hover{border-color:var(--accent2);color:var(--accent2)}
.btn-sm{padding:6px 14px;font-size:.78rem;border-radius:8px}
.btn-lg{padding:14px 36px;font-size:1rem;border-radius:14px}
.btn-full{width:100%;justify-content:center}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none !important}

/* Loading state */
.btn .spinner{display:none}
.btn.loading .btn-label{display:none}
.btn.loading .spinner{display:flex}
.btn.loading{pointer-events:none}

/* ── Spinner ── */
.spinner{width:15px;height:15px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}
.spinner-dark{border-color:rgba(0,0,0,.15);border-top-color:var(--accent)}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Cards ── */
.card{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:24px;transition:border-color .2s,transform .2s,box-shadow .2s}
.card-sm{border-radius:14px;padding:16px}
.card:hover{border-color:rgba(99,102,241,.3);box-shadow:0 8px 32px var(--shadow)}

/* ── Form elements ── */
.form-group{display:flex;flex-direction:column;gap:7px;margin-bottom:18px}
.form-group:last-child{margin-bottom:0}
.form-label{font-size:.73rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.07em}
.form-input,.form-select,.form-textarea{
  width:100%;background:var(--surface2);border:1px solid var(--border);
  border-radius:10px;padding:11px 14px;color:var(--text-bright);
  font-size:.875rem;font-family:'Inter',sans-serif;outline:none;transition:all .2s;
}
.form-input:focus,.form-select:focus,.form-textarea:focus{
  border-color:var(--accent);box-shadow:0 0 0 3px rgba(99,102,241,.12);
}
.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237c7c96' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}
.form-textarea{resize:vertical;min-height:80px;font-family:'JetBrains Mono',monospace;font-size:.8rem;line-height:1.6}
.form-error{color:var(--error);font-size:.78rem;margin-top:4px;display:none}
.form-error.show{display:block}

/* Toggle switch */
.toggle-row{display:flex;align-items:center;justify-content:space-between;padding:11px 14px;background:var(--surface2);border:1px solid var(--border);border-radius:10px}
.toggle-label{font-size:.875rem;color:var(--text);font-weight:500}
.toggle{width:44px;height:24px;background:var(--surface3);border-radius:12px;position:relative;cursor:pointer;border:none;transition:background .2s;flex-shrink:0}
.toggle.on{background:var(--accent)}
.toggle::after{content:'';position:absolute;width:18px;height:18px;background:#fff;border-radius:9px;top:3px;left:3px;transition:transform .2s;box-shadow:0 1px 4px rgba(0,0,0,.3)}
.toggle.on::after{transform:translateX(20px)}

/* ── Badge ── */
.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 9px;border-radius:6px;font-size:.67rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}
.badge-free{background:rgba(34,197,94,.15);color:var(--success)}
.badge-premium{background:rgba(168,85,247,.2);color:var(--premium)}
.badge-live{background:rgba(239,68,68,.15);color:var(--error)}
.badge-admin{background:rgba(99,102,241,.2);color:var(--accent2)}
.badge-student{background:var(--surface2);color:var(--muted)}
.live-dot{width:6px;height:6px;background:currentColor;border-radius:50%;animation:pulseDot 1.5s infinite}
@keyframes pulseDot{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}

/* ── Table ── */
.table-wrap{background:var(--surface);border:1px solid var(--border);border-radius:16px;overflow:hidden;overflow-x:auto}
table{width:100%;border-collapse:collapse;min-width:500px}
th{padding:11px 16px;text-align:left;font-size:.68rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;border-bottom:1px solid var(--border);background:var(--surface2);white-space:nowrap}
td{padding:12px 16px;font-size:.84rem;color:var(--text);border-bottom:1px solid var(--border);vertical-align:middle}
tr:last-child td{border-bottom:none}
tr:hover td{background:var(--card-hover)}
.td-name{font-weight:600;color:var(--text-bright)}
.td-mono{font-family:'JetBrains Mono',monospace;font-size:.8rem}
.td-actions{display:flex;gap:6px;justify-content:flex-end;flex-wrap:wrap}
.empty-row td{text-align:center;padding:36px;color:var(--muted);font-size:.875rem}

/* ── Modal ── */
.modal-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.7);backdrop-filter:blur(12px);
  z-index:300;display:flex;align-items:center;justify-content:center;padding:20px;
  opacity:0;pointer-events:none;transition:opacity .25s;
}
.modal-overlay.open{opacity:1;pointer-events:all}
.modal{
  background:var(--surface);border:1px solid var(--border);border-radius:22px;
  width:100%;max-width:500px;max-height:92vh;overflow-y:auto;
  transform:translateY(18px) scale(.97);transition:transform .25s;
}
.modal-overlay.open .modal{transform:none}
.modal-lg{max-width:660px}
.modal-header{padding:24px 24px 0;display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}
.modal-title{font-family:'Lexend',sans-serif;font-weight:800;font-size:1.1rem;color:var(--text-bright);letter-spacing:-.02em}
.modal-close{background:none;border:none;color:var(--muted);width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:8px;transition:all .2s;cursor:pointer}
.modal-close:hover{background:var(--surface2);color:var(--text)}
.modal-close svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2}
.modal-body{padding:0 24px 24px}
.modal-footer{padding:14px 24px 24px;border-top:1px solid var(--border);display:flex;gap:10px;justify-content:flex-end}

/* ── Sidebar layout ── */
.app-layout{display:flex;min-height:100vh}
.sidebar{
  width:240px;min-height:100vh;background:var(--surface);border-right:1px solid var(--border);
  display:flex;flex-direction:column;position:fixed;left:0;top:0;bottom:0;z-index:50;
  overflow-y:auto;transition:transform .3s;
}
.sidebar-logo{padding:22px 20px;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-nav{padding:14px 10px;flex:1}
.nav-section{margin-bottom:14px}
.nav-section-label{font-size:.63rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding:0 10px;margin-bottom:5px}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;
  color:var(--muted);font-size:.855rem;font-weight:500;transition:all .2s;
  cursor:pointer;border:none;background:none;width:100%;text-align:left;
}
.nav-item:hover{background:var(--surface2);color:var(--text)}
.nav-item.active{background:rgba(99,102,241,.14);color:var(--accent2)}
.nav-item svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.8;flex-shrink:0}
.sidebar-footer{padding:14px 10px;border-top:1px solid var(--border);flex-shrink:0}
.user-card{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;background:var(--surface2)}
.user-avatar{width:34px;height:34px;background:linear-gradient(135deg,var(--accent),var(--accent3));border-radius:9px;display:flex;align-items:center;justify-content:center;font-family:'Lexend',sans-serif;font-weight:700;font-size:.9rem;color:#fff;flex-shrink:0}
.user-info{overflow:hidden;flex:1}
.user-name{font-weight:600;font-size:.8rem;color:var(--text-bright);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-role{font-size:.7rem;color:var(--muted)}

.app-main{margin-left:240px;flex:1;min-height:100vh;display:flex;flex-direction:column}
.topbar{
  padding:16px 28px;border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;
  position:sticky;top:0;z-index:40;background:rgba(5,5,10,.85);backdrop-filter:blur(20px);
  gap:12px;
}
[data-theme="light"] .topbar{background:rgba(244,244,248,.9)}
.topbar-title{font-family:'Lexend',sans-serif;font-size:1rem;font-weight:700;color:var(--text-bright)}
.topbar-actions{display:flex;gap:8px;align-items:center}

/* Panels */
.panel{display:none;padding:28px;flex:1}
.panel.active{display:block}

/* ── Theme toggle ── */
.theme-toggle{width:36px;height:36px;background:var(--surface2);border:1px solid var(--border);border-radius:10px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;color:var(--muted)}
.theme-toggle:hover{border-color:var(--accent2);color:var(--accent2)}
.theme-toggle svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2}

/* ── Notification toast ── */
.notif{
  position:fixed;top:20px;right:20px;
  background:var(--surface);border:1px solid var(--success);color:var(--success);
  padding:12px 20px;border-radius:12px;font-size:.875rem;font-weight:600;
  z-index:9999;transform:translateX(calc(100% + 24px));transition:transform .3s;
  display:flex;align-items:center;gap:8px;box-shadow:0 8px 32px var(--shadow);
  max-width:320px;
}
.notif.error{border-color:var(--error);color:var(--error)}
.notif.show{transform:none}
.notif svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2.5;flex-shrink:0}

/* ── Mini progress bar ── */
.mini-bar{height:4px;background:var(--surface2);border-radius:2px;width:60px;overflow:hidden;display:inline-block;vertical-align:middle;margin-left:6px}
.mini-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:2px}

/* ── Premium tags ── */
.prem-tag{display:inline-flex;align-items:center;gap:5px;padding:3px 8px;border-radius:7px;font-size:.7rem;font-weight:700;margin:2px}
.prem-tag .revoke-x{width:10px;height:10px;stroke:currentColor;fill:none;stroke-width:2.5;cursor:pointer;opacity:.7}
.prem-tag .revoke-x:hover{opacity:1}
.prem-exam{background:rgba(168,85,247,.15);color:var(--premium);border:1px solid rgba(168,85,247,.3)}
.prem-batch{background:rgba(245,158,11,.15);color:var(--warning);border:1px solid rgba(245,158,11,.3)}
.prem-account{background:rgba(99,102,241,.15);color:var(--accent2);border:1px solid rgba(99,102,241,.3)}

/* ── Skeleton ── */
.skeleton{background:linear-gradient(90deg,var(--surface2) 25%,var(--surface3) 50%,var(--surface2) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:10px}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ── Section header ── */
.sect-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap;gap:10px}
.sect-title{font-family:'Lexend',sans-serif;font-size:1rem;font-weight:700;color:var(--text-bright)}

/* ── Stats grid ── */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:28px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:18px;position:relative;overflow:hidden;transition:transform .2s}
.stat-card:hover{transform:translateY(-2px)}
.stat-card::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(99,102,241,.05),transparent);pointer-events:none}
.stat-val{font-family:'Lexend',sans-serif;font-size:2rem;font-weight:900;color:var(--text-bright);letter-spacing:-.03em}
.stat-lbl{font-size:.72rem;color:var(--muted);font-weight:500;text-transform:uppercase;letter-spacing:.06em;margin-top:3px}
.stat-icon{width:34px;height:34px;background:rgba(99,102,241,.12);border-radius:9px;display:flex;align-items:center;justify-content:center;margin-bottom:10px}
.stat-icon svg{width:17px;height:17px;stroke:var(--accent2);fill:none;stroke-width:2}

/* ── Mobile bottom nav ── */
.bottom-nav{
  display:none;position:fixed;bottom:0;left:0;right:0;
  background:var(--surface);border-top:1px solid var(--border);
  z-index:50;padding:6px 0 env(safe-area-inset-bottom,6px);
}
.bottom-nav-items{display:flex}
.bottom-nav-item{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:8px 4px;color:var(--muted);font-size:.65rem;font-weight:600;
  border:none;background:none;cursor:pointer;transition:color .2s;
}
.bottom-nav-item.active{color:var(--accent2)}
.bottom-nav-item svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.8}

/* Hamburger for mobile */
.hamburger{display:none;width:36px;height:36px;background:var(--surface2);border:1px solid var(--border);border-radius:9px;align-items:center;justify-content:center;cursor:pointer;color:var(--muted)}
.hamburger svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:49;backdrop-filter:blur(4px)}

/* ── Grid helpers ── */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}

/* ── Exam cards ── */
.exam-card{background:var(--surface);border:2px solid var(--border);border-radius:16px;padding:18px 20px;transition:all .2s;cursor:pointer}
.exam-card:hover{border-color:rgba(99,102,241,.35);transform:translateY(-2px);box-shadow:0 8px 28px var(--shadow)}
.exam-card.live-card{border-color:rgba(239,68,68,.25)}
.exam-meta{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:8px}
.exam-meta-item{display:flex;align-items:center;gap:4px;font-size:.75rem;color:var(--muted)}
.exam-meta-item svg{width:12px;height:12px;stroke:currentColor;fill:none;stroke-width:2}

/* ── Landing nav ── */
.land-nav{
  position:fixed;top:0;left:0;right:0;z-index:100;padding:14px 36px;
  display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid transparent;transition:all .3s;
}
.land-nav.scrolled{background:rgba(5,5,10,.82);backdrop-filter:blur(20px);border-color:var(--border)}
[data-theme="light"] .land-nav.scrolled{background:rgba(244,244,248,.92)}
.land-nav-links{display:flex;gap:6px;align-items:center}
.land-nav-link{color:var(--muted);padding:8px 14px;border-radius:8px;font-size:.875rem;font-weight:500;transition:all .2s;border:none;background:none;cursor:pointer}
.land-nav-link:hover{color:var(--text);background:var(--surface2)}

/* ── Grid background ── */
.grid-bg{position:fixed;inset:0;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:60px 60px;opacity:.25;pointer-events:none;z-index:0}
[data-theme="light"] .grid-bg{opacity:.5}

/* ── Glow orbs ── */
.orb{position:fixed;border-radius:50%;filter:blur(100px);pointer-events:none;animation:orbFloat 9s ease-in-out infinite}
.orb1{width:500px;height:500px;background:radial-gradient(circle,rgba(99,102,241,.14),transparent 70%);top:-160px;left:-80px}
.orb2{width:400px;height:400px;background:radial-gradient(circle,rgba(168,85,247,.09),transparent 70%);bottom:-80px;right:-60px;animation-delay:4s}
@keyframes orbFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-28px)}}
[data-theme="light"] .orb{opacity:.4}

/* ── Responsive breakpoints ── */

/* Tablet */
@media(max-width:1024px){
  .grid-3{grid-template-columns:1fr 1fr}
  .land-nav{padding:14px 20px}
}

/* Mobile */
@media(max-width:768px){
  /* Sidebar → hidden, bottom nav shows */
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:none}
  .sidebar-overlay.open{display:block}
  .app-main{margin-left:0;padding-bottom:70px}
  .bottom-nav{display:block}
  .hamburger{display:flex}

  /* Panels */
  .panel{padding:16px}

  /* Topbar */
  .topbar{padding:12px 16px}

  /* Grid */
  .grid-2,.grid-3{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr 1fr}

  /* Table */
  .table-wrap{border-radius:12px}
  th,td{padding:10px 12px}

  /* Modal */
  .modal-overlay{align-items:flex-end;padding:0}
  .modal{border-radius:22px 22px 0 0;max-height:92vh;max-width:100%}

  /* Notif */
  .notif{top:auto;bottom:80px;right:12px;left:12px;max-width:100%;transform:translateY(120px)}
  .notif.show{transform:none}

  /* Landing */
  .land-nav-links .land-nav-link:not(.btn){display:none}
  .land-nav{padding:12px 16px}
}

@media(max-width:480px){
  .stats-grid{grid-template-columns:1fr 1fr}
  .sect-header{flex-direction:column;align-items:flex-start}
  .td-actions{flex-direction:column}
  .btn-lg{padding:12px 24px;font-size:.9rem}
}

/* ── Scrollbar ── */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--muted)}