/* ============================================================
   CheMentor — Global Stylesheet
   ============================================================ */

:root {
  --primary: #6c63ff;
  --primary-dark: #574fd6;
  --secondary: #11998e;
  --accent: #f093fb;
  --danger: #e74c3c;
  --warning: #f39c12;
  --success: #27ae60;
  --info: #3498db;
  --bg: #f0f2f5;
  --card: #ffffff;
  --text: #2d3748;
  --text-muted: #718096;
  --border: #e2e8f0;
  --sidebar-w: 270px;
  --radius: 14px;
  --shadow: 0 4px 20px rgba(0,0,0,.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.15);
  --trans: all .25s ease;
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { font-family:'Inter','Segoe UI',sans-serif; background:var(--bg); color:var(--text); min-height:100vh; }

/* ---- Sidebar ---- */
.sidebar {
  position:fixed; left:0; top:0; bottom:0; width:var(--sidebar-w);
  background:linear-gradient(160deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%);
  display:flex; flex-direction:column; overflow-y:auto; z-index:900;
  transition:transform .3s ease;
}
.sidebar-brand {
  padding:28px 24px 20px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.sidebar-brand .logo { display:flex; align-items:center; gap:12px; margin-bottom:16px; }
.sidebar-brand .logo-icon {
  width:44px; height:44px; border-radius:12px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex; align-items:center; justify-content:center;
  font-size:1.4em; color:#fff; box-shadow:0 4px 12px rgba(108,99,255,.4);
}
.sidebar-brand .logo h2 { color:#fff; font-size:1.3em; font-weight:700; }
.sidebar-brand .logo p  { color:rgba(255,255,255,.5); font-size:.75em; }

.user-card {
  display:flex; align-items:center; gap:12px; padding:12px 16px;
  background:rgba(255,255,255,.06); border-radius:12px;
}
.user-card .avatar {
  width:40px; height:40px; border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex; align-items:center; justify-content:center;
  font-weight:700; color:#fff; font-size:1.1em; flex-shrink:0; overflow:hidden;
}
.user-card .avatar img { width:100%; height:100%; object-fit:cover; border-radius:50%; }
.user-card .uname { color:#fff; font-weight:600; font-size:.9em; }
.user-card .urole { color:rgba(255,255,255,.45); font-size:.75em; }

.nav-section { padding:16px 16px 0; }
.nav-section-title {
  font-size:.65em; font-weight:700; letter-spacing:1.2px;
  color:rgba(255,255,255,.3); text-transform:uppercase;
  padding:0 8px 8px;
}
.nav-item {
  display:flex; align-items:center; gap:12px;
  padding:11px 12px; border-radius:10px; margin-bottom:3px;
  color:rgba(255,255,255,.6); text-decoration:none; font-size:.9em;
  transition:var(--trans); position:relative;
}
.nav-item:hover { background:rgba(255,255,255,.08); color:#fff; }
.nav-item.active {
  background:linear-gradient(90deg,rgba(108,99,255,.35),rgba(108,99,255,.1));
  color:#fff;
  border-left:3px solid var(--primary);
}
.nav-item i { width:20px; text-align:center; font-size:1em; }
.nav-item .badge-num {
  margin-left:auto; background:var(--danger); color:#fff;
  border-radius:10px; padding:1px 7px; font-size:.7em; font-weight:700;
}
.nav-item.external-link::after { content:' ↗'; font-size:.7em; opacity:.5; }

.sidebar-footer { margin-top:auto; padding:16px; border-top:1px solid rgba(255,255,255,.08); }
.logout-btn {
  display:flex; align-items:center; gap:10px;
  padding:11px 12px; border-radius:10px; color:rgba(255,255,255,.6);
  text-decoration:none; font-size:.9em; transition:var(--trans); width:100%;
}
.logout-btn:hover { background:rgba(231,76,60,.2); color:#e74c3c; }

/* ---- Main Content ---- */
.main-content { margin-left:var(--sidebar-w); padding:28px; min-height:100vh; }

/* ---- Top Bar ---- */
.topbar {
  display:flex; justify-content:space-between; align-items:center;
  background:var(--card); padding:16px 24px; border-radius:var(--radius);
  box-shadow:var(--shadow); margin-bottom:28px;
}
.topbar-left h1 { font-size:1.6em; font-weight:700; color:var(--text); }
.topbar-left p  { color:var(--text-muted); font-size:.9em; margin-top:3px; }
.topbar-right   { display:flex; align-items:center; gap:14px; }
.coins-badge {
  display:flex; align-items:center; gap:8px;
  background:linear-gradient(135deg,#f093fb,#f5576c);
  color:#fff; padding:9px 18px; border-radius:25px;
  font-weight:700; font-size:.9em; box-shadow:0 4px 12px rgba(240,147,251,.3);
}
.notif-btn {
  width:40px; height:40px; border-radius:10px; border:none;
  background:var(--bg); color:var(--text); cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  font-size:1.1em; position:relative; transition:var(--trans);
}
.notif-btn:hover { background:var(--primary); color:#fff; }
.notif-dot {
  width:8px; height:8px; background:var(--danger); border-radius:50%;
  position:absolute; top:6px; right:6px; border:2px solid var(--card);
}

/* ---- Cards ---- */
.card {
  background:var(--card); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:24px;
}
.card-title {
  font-size:1.1em; font-weight:700; color:var(--text);
  margin-bottom:20px; padding-bottom:12px;
  border-bottom:2px solid var(--bg);
  display:flex; align-items:center; gap:8px;
}
.card-title i { color:var(--primary); }

/* Stat cards */
.stats-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:20px; margin-bottom:28px; }
.stat-card {
  background:var(--card); border-radius:var(--radius); padding:22px;
  box-shadow:var(--shadow); display:flex; align-items:center; gap:18px;
  transition:var(--trans); cursor:default;
}
.stat-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg); }
.stat-icon {
  width:58px; height:58px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  font-size:1.6em; flex-shrink:0;
}
.si-purple { background:linear-gradient(135deg,#6c63ff,#9c8fff); color:#fff; }
.si-green  { background:linear-gradient(135deg,#11998e,#38ef7d); color:#fff; }
.si-orange { background:linear-gradient(135deg,#f093fb,#f5576c); color:#fff; }
.si-blue   { background:linear-gradient(135deg,#4facfe,#00f2fe); color:#fff; }
.si-red    { background:linear-gradient(135deg,#e74c3c,#ff6b6b); color:#fff; }
.si-yellow { background:linear-gradient(135deg,#f7971e,#ffd200); color:#fff; }
.stat-info .num { font-size:2em; font-weight:800; color:var(--text); line-height:1; }
.stat-info .label { color:var(--text-muted); font-size:.85em; margin-top:4px; }

/* ---- Buttons ---- */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 20px; border-radius:10px; border:none;
  font-size:.9em; font-weight:600; cursor:pointer;
  transition:var(--trans); text-decoration:none; white-space:nowrap;
}
.btn-primary  { background:linear-gradient(135deg,var(--primary),var(--primary-dark)); color:#fff; box-shadow:0 4px 12px rgba(108,99,255,.3); }
.btn-success  { background:linear-gradient(135deg,#11998e,#38ef7d); color:#fff; box-shadow:0 4px 12px rgba(17,153,142,.3); }
.btn-danger   { background:linear-gradient(135deg,#e74c3c,#ff6b6b); color:#fff; box-shadow:0 4px 12px rgba(231,76,60,.3); }
.btn-warning  { background:linear-gradient(135deg,#f39c12,#ffd200); color:#fff; }
.btn-info     { background:linear-gradient(135deg,#3498db,#4facfe); color:#fff; }
.btn-outline  { background:transparent; color:var(--primary); border:2px solid var(--primary); }
.btn-sm       { padding:7px 14px; font-size:.82em; }
.btn:hover    { transform:translateY(-2px); opacity:.92; }
.btn:active   { transform:translateY(0); }

/* ---- Tables ---- */
.table-wrap { overflow-x:auto; border-radius:var(--radius); }
table { width:100%; border-collapse:collapse; font-size:.9em; }
thead th {
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff; padding:13px 16px; text-align:left;
  font-weight:600; font-size:.82em; letter-spacing:.4px;
}
thead th:first-child { border-radius:10px 0 0 0; }
thead th:last-child  { border-radius:0 10px 0 0; }
tbody tr { border-bottom:1px solid var(--border); transition:var(--trans); }
tbody tr:hover { background:#f8fafc; }
tbody td { padding:12px 16px; color:var(--text); vertical-align:middle; }
tbody tr:last-child td:first-child { border-radius:0 0 0 10px; }
tbody tr:last-child td:last-child  { border-radius:0 0 10px 0; }

/* ---- Forms ---- */
.form-group { margin-bottom:20px; }
.form-group label { display:block; margin-bottom:7px; font-weight:600; color:var(--text); font-size:.9em; }
.form-control {
  width:100%; padding:12px 15px;
  border:2px solid var(--border); border-radius:10px;
  font-size:.95em; font-family:inherit; color:var(--text);
  background:#fff; transition:var(--trans); outline:none;
}
.form-control:focus { border-color:var(--primary); box-shadow:0 0 0 4px rgba(108,99,255,.12); }
.form-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:16px; }

/* ---- Alerts / Toasts ---- */
.alert {
  padding:13px 18px; border-radius:10px; margin-bottom:18px;
  display:flex; align-items:center; gap:10px; font-size:.92em;
}
.alert-success { background:#d4edda; color:#155724; border-left:4px solid var(--success); }
.alert-danger  { background:#f8d7da; color:#721c24; border-left:4px solid var(--danger); }
.alert-warning { background:#fff3cd; color:#856404; border-left:4px solid var(--warning); }
.alert-info    { background:#cce5ff; color:#004085; border-left:4px solid var(--info); }

/* ---- Badges ---- */
.badge {
  display:inline-block; padding:3px 10px; border-radius:20px;
  font-size:.75em; font-weight:700; text-transform:uppercase; letter-spacing:.4px;
}
.badge-icse  { background:#e3f2fd; color:#1565c0; }
.badge-isc   { background:#f3e5f5; color:#6a1b9a; }
.badge-p1112 { background:#e8f5e9; color:#2e7d32; }
.badge-active   { background:#d4edda; color:#155724; }
.badge-inactive { background:#f8d7da; color:#721c24; }
.badge-pending  { background:#fff3cd; color:#856404; }
.badge-answered { background:#d4edda; color:#155724; }
.badge-resolved { background:#cce5ff; color:#004085; }
.badge-female   { background:#fce4ec; color:#c2185b; }
.badge-male     { background:#e3f2fd; color:#1565c0; }

/* ---- Pagination ---- */
.pagination { display:flex; gap:6px; justify-content:center; margin-top:20px; flex-wrap:wrap; }
.page-btn {
  padding:8px 14px; border-radius:8px; border:none;
  background:var(--bg); color:var(--text); cursor:pointer;
  font-size:.88em; font-weight:600; transition:var(--trans);
}
.page-btn:hover, .page-btn.active { background:var(--primary); color:#fff; }

/* ---- Modal ---- */
.modal-bg {
  position:fixed; inset:0; background:rgba(0,0,0,.55);
  display:flex; align-items:center; justify-content:center;
  z-index:2000; backdrop-filter:blur(4px);
  opacity:0; pointer-events:none; transition:opacity .25s ease;
}
.modal-bg.open { opacity:1; pointer-events:all; }
.modal {
  background:var(--card); border-radius:18px; width:90%; max-width:600px;
  max-height:90vh; overflow-y:auto; box-shadow:var(--shadow-lg);
  transform:scale(.95); transition:transform .25s ease;
}
.modal-bg.open .modal { transform:scale(1); }
.modal-header {
  padding:22px 26px; border-bottom:1px solid var(--border);
  display:flex; justify-content:space-between; align-items:center;
  position:sticky; top:0; background:var(--card); z-index:1;
}
.modal-header h3 { font-size:1.2em; font-weight:700; }
.modal-close { background:none; border:none; font-size:1.4em; cursor:pointer; color:var(--text-muted); transition:var(--trans); }
.modal-close:hover { color:var(--danger); }
.modal-body   { padding:24px 26px; }
.modal-footer { padding:16px 26px; border-top:1px solid var(--border); display:flex; justify-content:flex-end; gap:10px; }

/* ---- Profile Image ---- */
.profile-pic-wrap {
  text-align:center; margin-bottom:28px;
}
.profile-pic {
  width:130px; height:130px; border-radius:50%; margin:0 auto 16px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex; align-items:center; justify-content:center;
  font-size:3.5em; font-weight:700; color:#fff; overflow:hidden;
  box-shadow:0 6px 24px rgba(108,99,255,.3);
}
.profile-pic img { width:100%; height:100%; object-fit:cover; border-radius:50%; }
.upload-label {
  display:inline-flex; align-items:center; gap:8px;
  padding:9px 20px; background:var(--bg); border-radius:10px;
  cursor:pointer; font-size:.88em; font-weight:600; color:var(--text);
  transition:var(--trans); border:2px dashed var(--border);
}
.upload-label:hover { border-color:var(--primary); color:var(--primary); }
.upload-label input { display:none; }

/* ---- Empty state ---- */
.empty-state { text-align:center; padding:60px 20px; color:var(--text-muted); }
.empty-state i { font-size:3.5em; margin-bottom:16px; opacity:.25; }
.empty-state p { font-size:1.05em; margin-bottom:18px; }

/* ---- Search bar ---- */
.search-bar {
  display:flex; gap:12px; align-items:center; flex-wrap:wrap;
  background:var(--card); padding:16px 20px; border-radius:var(--radius);
  box-shadow:var(--shadow); margin-bottom:22px;
}
.search-input-wrap { position:relative; flex:1; min-width:200px; }
.search-input-wrap i { position:absolute; left:13px; top:50%; transform:translateY(-50%); color:var(--text-muted); }
.search-input-wrap input {
  width:100%; padding:11px 14px 11px 40px;
  border:2px solid var(--border); border-radius:10px;
  font-size:.93em; outline:none; transition:var(--trans); font-family:inherit;
}
.search-input-wrap input:focus { border-color:var(--primary); }

/* ---- Doubt cards ---- */
.doubt-card {
  border:1px solid var(--border); border-radius:12px; padding:18px 20px;
  margin-bottom:14px; transition:var(--trans);
}
.doubt-card:hover { box-shadow:var(--shadow); border-color:var(--primary); }
.doubt-subject { font-weight:700; font-size:1em; margin-bottom:6px; }
.doubt-text    { color:var(--text-muted); font-size:.9em; margin-bottom:10px; }
.doubt-answer  { background:#f0fff4; border-left:3px solid var(--success); padding:10px 14px; border-radius:8px; font-size:.9em; color:#155724; margin-top:10px; }

/* ---- Product card ---- */
.product-card {
  border:1px solid var(--border); border-radius:12px; padding:18px;
  transition:var(--trans); background:var(--card);
}
.product-card:hover { box-shadow:var(--shadow); transform:translateY(-3px); }
.product-name  { font-weight:700; margin-bottom:6px; }
.product-meta  { color:var(--text-muted); font-size:.85em; margin-bottom:12px; }
.products-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:16px; }

/* ---- Mobile ---- */
.mobile-menu-btn {
  display:none; position:fixed; bottom:24px; right:24px;
  width:56px; height:56px; border-radius:50%; border:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff; font-size:1.4em; box-shadow:0 6px 20px rgba(108,99,255,.4);
  cursor:pointer; z-index:800;
}
.overlay { display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); z-index:850; }

@media(max-width:900px){
  .sidebar { transform:translateX(-100%); }
  .sidebar.open { transform:translateX(0); }
  .main-content { margin-left:0; padding:16px; }
  .topbar { padding:14px 16px; }
  .mobile-menu-btn,.overlay { display:block; }
  .overlay.visible { display:block; }
  .stats-grid { grid-template-columns:repeat(2,1fr); }
}
@media(max-width:500px){
  .stats-grid { grid-template-columns:1fr; }
  .topbar { flex-direction:column; gap:12px; text-align:center; }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background:#f1f1f1; }
::-webkit-scrollbar-thumb { background:var(--primary); border-radius:3px; }

/* ---- Animations ---- */
@keyframes fadeUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }
.fade-up { animation:fadeUp .4s ease both; }

/* ---- WhatsApp button ---- */
.wa-btn {
  display:inline-flex; align-items:center; gap:6px;
  background:#25D366; color:#fff; padding:6px 14px;
  border-radius:8px; text-decoration:none; font-size:.82em; font-weight:600;
  transition:var(--trans);
}
.wa-btn:hover { background:#1da851; }

/* ---- Coin animation ---- */
.coin-badge {
  display:inline-flex; align-items:center; gap:6px;
  background:linear-gradient(135deg,#f7971e,#ffd200);
  color:#333; padding:5px 14px; border-radius:20px;
  font-weight:700; font-size:.88em;
}

/* ---- Admin nav highlight ---- */
.admin-sidebar-header {
  background:linear-gradient(135deg,#ff416c,#ff4b2b);
}

/* ---- Activity feed ---- */
.feed-item {
  display:flex; gap:14px; padding:12px 0; border-bottom:1px solid var(--border);
}
.feed-icon {
  width:38px; height:38px; border-radius:10px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  font-size:.95em;
}
.feed-text .ft  { font-size:.9em; color:var(--text); font-weight:500; }
.feed-text .fs  { font-size:.8em; color:var(--text-muted); margin-top:2px; }

/* ---- Login page ---- */
.login-page {
  min-height:100vh; display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg,#667eea 0%,#764ba2 50%,#11998e 100%);
  padding:20px;
}
.login-box {
  background:#fff; border-radius:20px; box-shadow:0 20px 60px rgba(0,0,0,.2);
  overflow:hidden; width:100%; max-width:920px;
  display:grid; grid-template-columns:1.1fr 1fr;
  animation:fadeUp .5s ease both;
}
.login-left-panel {
  background:linear-gradient(160deg,#6c63ff,#764ba2);
  padding:60px 40px; display:flex; flex-direction:column;
  justify-content:center; align-items:center; text-align:center; color:#fff;
  position:relative; overflow:hidden;
}
.login-left-panel::before {
  content:''; position:absolute; width:200px; height:200px;
  border-radius:50%; background:rgba(255,255,255,.06);
  top:-60px; right:-60px;
}
.login-left-panel::after {
  content:''; position:absolute; width:150px; height:150px;
  border-radius:50%; background:rgba(255,255,255,.06);
  bottom:-40px; left:-40px;
}
.login-left-panel .brand-icon {
  width:90px; height:90px; border-radius:22px;
  background:rgba(255,255,255,.15); backdrop-filter:blur(10px);
  display:flex; align-items:center; justify-content:center;
  font-size:2.8em; margin-bottom:24px; position:relative; z-index:1;
}
.login-left-panel h1 { font-size:2.4em; font-weight:800; margin-bottom:10px; position:relative; z-index:1; }
.login-left-panel p  { opacity:.85; line-height:1.6; position:relative; z-index:1; font-size:1.05em; }
.login-features { margin-top:28px; text-align:left; position:relative; z-index:1; }
.login-features li { list-style:none; padding:5px 0; font-size:.9em; opacity:.85; }
.login-features li::before { content:'✓ '; font-weight:700; }

.login-right-panel { padding:50px 44px; display:flex; flex-direction:column; justify-content:center; }
.login-right-panel h2 { font-size:1.9em; font-weight:800; color:var(--text); margin-bottom:6px; }
.login-right-panel .sub { color:var(--text-muted); margin-bottom:32px; font-size:.95em; }
.login-input-group { margin-bottom:20px; }
.login-input-group label { display:block; margin-bottom:7px; font-weight:600; color:var(--text); font-size:.9em; }
.login-input-wrap { position:relative; }
.login-input-wrap i { position:absolute; left:14px; top:50%; transform:translateY(-50%); color:#aaa; font-size:1em; }
.login-input-wrap input {
  width:100%; padding:14px 14px 14px 44px;
  border:2px solid var(--border); border-radius:12px;
  font-size:1em; outline:none; transition:var(--trans); font-family:inherit; color:var(--text);
}
.login-input-wrap input:focus { border-color:var(--primary); box-shadow:0 0 0 4px rgba(108,99,255,.1); }
.login-btn {
  width:100%; padding:15px; border-radius:12px; border:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff; font-size:1.05em; font-weight:700; cursor:pointer;
  transition:var(--trans); margin-top:8px;
  box-shadow:0 5px 18px rgba(108,99,255,.35);
}
.login-btn:hover { transform:translateY(-2px); box-shadow:0 8px 22px rgba(108,99,255,.45); }
.login-err { color:var(--danger); font-size:.88em; padding:10px 14px; background:#fef2f2; border-radius:8px; margin-top:10px; display:flex; align-items:center; gap:7px; }

@media(max-width:700px){
  .login-box { grid-template-columns:1fr; }
  .login-left-panel { padding:40px 30px; }
  .login-right-panel { padding:36px 28px; }
}