/* ============================================================
   Learning Engagement System  --  assets/style.css
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=DM+Sans:wght@400;500;600;700&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
    --brand:    #2563eb;
    --brand-dk: #1d4ed8;
    --brand-lt: #eff6ff;
    --navy:     #0f172a;
    --navy-lt:  #1e293b;
    --cream:    #f8fafc;
    --white:    #ffffff;
    --grey:     #64748b;
    --grey-lt:  #e2e8f0;
    --success:  #16a34a;
    --warning:  #d97706;
    --danger:   #dc2626;
    --info:     #0891b2;
    --purple:   #7c3aed;
    --orange:   #ea580c;
    --radius:   10px;
    --shadow:   0 4px 20px rgba(0,0,0,.09);
    --shadow-sm:0 2px 8px  rgba(0,0,0,.06);
}

/* ── Reset / Base ───────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'DM Sans',sans-serif;background:var(--cream);color:var(--navy);font-size:16px;line-height:1.6}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dk);text-decoration:underline}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar{background:var(--navy);padding:.75rem 2rem;display:flex;align-items:center;
        justify-content:space-between;box-shadow:0 2px 12px rgba(0,0,0,.3);
        position:sticky;top:0;z-index:100}
.navbar-brand{color:var(--white);font-family:'Inter',sans-serif;font-size:1.1rem;
              font-weight:800;letter-spacing:-.3px;display:flex;align-items:center;gap:.6rem}
.navbar-brand .brand-icon{min-width:42px;height:28px;padding:0 8px;background:var(--brand);
                           border-radius:6px;display:grid;place-items:center;font-size:.75rem;
                           font-weight:900;letter-spacing:.5px;color:#fff;font-family:'Inter',sans-serif;
                           flex-shrink:0}
.navbar-brand .brand-text em{color:#93c5fd;font-style:normal;font-weight:600}
.navbar-nav{display:flex;align-items:center;gap:1.5rem;list-style:none}
.navbar-nav a{color:rgba(255,255,255,.75);font-weight:500;font-size:.9rem;transition:color .2s}
.navbar-nav a:hover,.navbar-nav a.active{color:#60a5fa;text-decoration:none}
.nav-badge{background:var(--brand);color:#fff;border-radius:20px;padding:.1rem .6rem;
           font-size:.72rem;font-weight:700;vertical-align:middle;margin-left:.25rem}

/* ── Layout ─────────────────────────────────────────────────── */
.page-wrapper{display:flex;min-height:calc(100vh - 58px)}
.sidebar{width:230px;background:var(--white);border-right:1px solid var(--grey-lt);
         padding:1.2rem 0;flex-shrink:0}
.sidebar-section{padding:0 1rem;margin-bottom:1.4rem}
.sidebar-label{text-transform:uppercase;font-size:.67rem;font-weight:700;letter-spacing:1.2px;
               color:var(--grey);margin-bottom:.4rem;padding:0 .7rem}
.sidebar-link{display:flex;align-items:center;gap:.65rem;padding:.5rem .7rem;border-radius:7px;
              color:var(--navy);font-weight:500;font-size:.88rem;transition:background .15s,color .15s}
.sidebar-link:hover,.sidebar-link.active{background:var(--brand-lt);color:var(--brand-dk);text-decoration:none}
.sidebar-link .icon{font-size:.9rem;width:22px;text-align:center;opacity:.7}
.main-content{flex:1;padding:2rem 2.4rem;max-width:1100px}

/* ── Cards ──────────────────────────────────────────────────── */
.card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow-sm);
      padding:1.4rem;margin-bottom:1.4rem}
.card-header{display:flex;align-items:center;justify-content:space-between;
             margin-bottom:1.1rem;border-bottom:1px solid var(--grey-lt);padding-bottom:.75rem}
.card-header h2,.card-header h3{font-size:1.05rem;font-weight:700;margin:0}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:1.1rem}

/* ── Stat cards ─────────────────────────────────────────────── */
.stat-card{background:var(--navy);color:var(--white);border-radius:var(--radius);
           padding:1.3rem 1.5rem;display:flex;align-items:center;gap:1.1rem;box-shadow:var(--shadow)}
.stat-card .stat-icon{font-size:1.8rem;width:44px;height:44px;border-radius:10px;
                      background:rgba(255,255,255,.12);display:grid;place-items:center;flex-shrink:0}
.stat-info .value{font-size:1.9rem;font-weight:800;line-height:1}
.stat-info .label{font-size:.78rem;opacity:.7;margin-top:.15rem}
.stat-card.blue   {background:var(--brand)}
.stat-card.green  {background:var(--success)}
.stat-card.orange {background:var(--orange)}
.stat-card.purple {background:var(--purple)}

/* ── Buttons ────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:.35rem;padding:.5rem 1.2rem;border-radius:7px;
     font-family:'DM Sans',sans-serif;font-size:.88rem;font-weight:600;border:2px solid transparent;
     cursor:pointer;transition:all .16s;text-decoration:none;line-height:1.4}
.btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.btn-primary {background:var(--brand);   color:#fff;border-color:var(--brand)}
.btn-primary:hover{background:var(--brand-dk);border-color:var(--brand-dk);color:#fff}
.btn-secondary{background:var(--grey-lt);color:var(--navy);border-color:var(--grey-lt)}
.btn-secondary:hover{background:#cbd5e1}
.btn-danger {background:var(--danger);color:#fff;border-color:var(--danger)}
.btn-danger:hover{background:#b91c1c;color:#fff}
.btn-outline{background:transparent;color:var(--brand);border-color:var(--brand)}
.btn-outline:hover{background:var(--brand);color:#fff}
.btn-sm{padding:.28rem .8rem;font-size:.8rem}

/* ── Forms ──────────────────────────────────────────────────── */
.form-group{margin-bottom:1rem}
label{display:block;font-weight:600;font-size:.84rem;margin-bottom:.3rem;color:var(--navy)}
input[type=text],input[type=email],input[type=password],input[type=number],
select,textarea{width:100%;padding:.55rem .85rem;border:2px solid var(--grey-lt);border-radius:7px;
                font-family:'DM Sans',sans-serif;font-size:.92rem;color:var(--navy);
                background:var(--cream);transition:border-color .18s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);background:var(--white)}
textarea{resize:vertical;min-height:90px}
.form-hint{font-size:.77rem;color:var(--grey);margin-top:.22rem}

/* ── Tables ─────────────────────────────────────────────────── */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:.7rem .95rem;text-align:left;border-bottom:1px solid var(--grey-lt);font-size:.87rem}
th{font-weight:700;background:var(--cream);font-size:.76rem;text-transform:uppercase;
   letter-spacing:.7px;color:var(--grey)}
tr:hover td{background:rgba(37,99,235,.03)}

/* ── Badge pills ─────────────────────────────────────────────── */
.badge-pill{display:inline-flex;align-items:center;gap:.3rem;padding:.2rem .7rem;
            border-radius:20px;font-size:.75rem;font-weight:600}
.badge-success{background:rgba(22,163,74,.1); color:var(--success)}
.badge-warning{background:rgba(217,119,6,.12);color:var(--warning)}
.badge-info   {background:rgba(8,145,178,.1); color:var(--info)}
.badge-danger {background:rgba(220,38,38,.1); color:var(--danger)}
.badge-neutral{background:var(--grey-lt);     color:var(--grey)}
.badge-brand  {background:var(--brand-lt);    color:var(--brand)}
.badge-purple {background:rgba(124,58,237,.1);color:var(--purple)}

/* ── Achievement badges ──────────────────────────────────────── */
.achievement{display:flex;align-items:center;gap:.85rem;background:linear-gradient(135deg,var(--navy),var(--navy-lt));
             color:var(--white);border-radius:var(--radius);padding:.9rem 1.2rem}
.achievement .ach-icon{width:40px;height:40px;background:rgba(255,255,255,.15);border-radius:8px;
                       display:grid;place-items:center;font-size:1.1rem;font-weight:900;
                       font-family:'Inter',sans-serif;flex-shrink:0}
.achievement .ach-name{font-weight:700;font-size:.92rem}
.achievement .ach-desc{font-size:.78rem;opacity:.72}
.achievement.locked{opacity:.42;filter:grayscale(1)}

/* ── Progress bar ───────────────────────────────────────────── */
.progress-bar-wrap{background:var(--grey-lt);border-radius:50px;height:8px;overflow:hidden;margin:.25rem 0}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--brand),#60a5fa);
                   border-radius:50px;transition:width .5s ease}

/* ── Alerts ─────────────────────────────────────────────────── */
.alert{padding:.75rem 1.1rem;border-radius:7px;margin-bottom:.9rem;font-weight:500;
       font-size:.88rem;border-left:3px solid}
.alert-success{background:rgba(22,163,74,.08); border-color:var(--success);color:#166534}
.alert-danger {background:rgba(220,38,38,.08); border-color:var(--danger); color:#991b1b}
.alert-warning{background:rgba(217,119,6,.10); border-color:var(--warning);color:#92400e}
.alert-info   {background:rgba(8,145,178,.08); border-color:var(--info);   color:#155e75}

/* ── Quiz ───────────────────────────────────────────────────── */
.quiz-question{background:var(--white);border-radius:var(--radius);padding:1.4rem;
               margin-bottom:1.1rem;box-shadow:var(--shadow-sm);border-left:3px solid var(--brand)}
.quiz-question h4{font-size:.97rem;font-weight:700;margin-bottom:.9rem}
.quiz-options{display:flex;flex-direction:column;gap:.5rem}
.quiz-option{display:flex;align-items:center;gap:.65rem;padding:.55rem .85rem;
             border:2px solid var(--grey-lt);border-radius:7px;cursor:pointer;
             transition:border-color .14s,background .14s;font-weight:500}
.quiz-option:hover{border-color:var(--brand);background:var(--brand-lt)}
.quiz-option:has(input:checked){border-color:var(--brand);background:var(--brand-lt)}
.option-letter{width:26px;height:26px;background:var(--grey-lt);color:var(--navy);
               border-radius:50%;display:grid;place-items:center;font-weight:700;
               font-size:.8rem;flex-shrink:0}
.timer-box{position:sticky;top:66px;background:var(--navy);color:var(--white);
           border-radius:var(--radius);padding:.7rem 1.4rem;text-align:center;
           font-family:'Inter',monospace;font-size:1.4rem;font-weight:800;margin-bottom:1.4rem;z-index:10}
.timer-box.urgent{background:var(--danger)}

/* ── Score circle ───────────────────────────────────────────── */
.score-circle{width:110px;height:110px;border-radius:50%;border:7px solid var(--brand);
              display:flex;flex-direction:column;align-items:center;justify-content:center;
              margin:0 auto 1.3rem}
.score-circle .pct{font-size:1.8rem;font-weight:800;color:var(--brand);line-height:1}
.score-circle .lbl{font-size:.72rem;color:var(--grey)}

/* ── Forum ──────────────────────────────────────────────────── */
.thread-item{display:flex;align-items:flex-start;gap:.9rem;padding:.9rem 0;
             border-bottom:1px solid var(--grey-lt)}
.thread-item:last-child{border-bottom:none}
.thread-avatar{width:38px;height:38px;background:var(--brand);border-radius:50%;
               display:grid;place-items:center;color:#fff;font-weight:700;font-size:.9rem;flex-shrink:0}
.thread-title{font-weight:600;color:var(--navy)}
.thread-meta{font-size:.78rem;color:var(--grey);margin-top:.18rem}
.pinned-label{font-size:.72rem;background:var(--brand);color:#fff;padding:.08rem .45rem;
              border-radius:4px;margin-right:.35rem}
.reply-bubble{background:var(--cream);border-radius:10px;padding:.9rem 1.1rem;margin-bottom:.9rem}
.reply-bubble .author{font-weight:700;font-size:.85rem;color:var(--brand-dk)}
.reply-bubble .time{font-size:.76rem;color:var(--grey)}

/* ── Login page ─────────────────────────────────────────────── */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;
            background:linear-gradient(135deg,var(--navy) 0%,var(--navy-lt) 55%,#1e3a5f 100%);
            padding:2rem}
.login-card{background:var(--white);border-radius:16px;padding:2.4rem;width:100%;
            max-width:410px;box-shadow:0 24px 64px rgba(0,0,0,.35)}
.login-logo{text-align:center;margin-bottom:1.8rem}
.login-logo .brand-mark{min-width:72px;height:42px;padding:0 16px;background:var(--brand);
                         border-radius:10px;display:grid;place-items:center;margin:0 auto 1rem;
                         font-size:.95rem;font-weight:900;letter-spacing:1px;color:#fff;
                         font-family:'Inter',sans-serif}
.login-logo h1{font-family:'Inter',sans-serif;font-size:1.35rem;font-weight:800;color:var(--navy)}
.login-logo p{color:var(--grey);font-size:.87rem;margin-top:.2rem}

/* ── Page header ────────────────────────────────────────────── */
.page-header{margin-bottom:1.8rem}
.page-header h1{font-size:1.6rem;font-weight:800;color:var(--navy)}
.page-header p{color:var(--grey);margin-top:.25rem;font-size:.92rem}
.breadcrumb{font-size:.8rem;color:var(--grey);margin-bottom:.45rem}
.breadcrumb a{color:var(--brand)}

/* ── Class badge / tag ───────────────────────────────────────── */
.class-tag{display:inline-flex;align-items:center;gap:.35rem;padding:.2rem .7rem;
           background:var(--brand-lt);color:var(--brand-dk);border-radius:20px;
           font-size:.76rem;font-weight:600}

/* ── Game Show ──────────────────────────────────────────────── */
.gs-panel{background:var(--white);border-radius:var(--radius);padding:1.1rem;
          box-shadow:var(--shadow-sm);margin-bottom:.9rem}
.answer-card{background:var(--cream);border-radius:7px;padding:.65rem .95rem;margin:.35rem 0;
             display:flex;align-items:center;justify-content:space-between;gap:.7rem}
.answer-text{font-weight:700;font-family:'Inter',monospace;letter-spacing:.4px}
.masked{filter:blur(5px);user-select:none}
.correct-item{background:#dcfce7;border:1px solid #16a34a;border-radius:7px;padding:.55rem .95rem;
              margin:.25rem 0;cursor:grab;display:flex;align-items:center;gap:.5rem}
.score-row{display:flex;justify-content:space-between;align-items:center;padding:.45rem 0;
           border-bottom:1px solid var(--grey-lt)}
.rank-badge{width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;
            display:grid;place-items:center;font-weight:700;font-size:.78rem;flex-shrink:0}

/* ── Visual show ────────────────────────────────────────────── */
.drop-zone{border:2px dashed var(--grey-lt);border-radius:var(--radius);padding:1.8rem;
           text-align:center;cursor:pointer;transition:border-color .18s,background .18s;
           background:var(--cream)}
.drop-zone.drag-over{border-color:var(--brand);background:var(--brand-lt)}
.vs-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(175px,1fr));gap:.95rem}
.vs-card{background:#fff;border-radius:9px;padding:.7rem;box-shadow:var(--shadow-sm)}
.vs-card img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px;cursor:pointer}
.vs-caption{font-size:.78rem;color:var(--grey);margin-top:.38rem;white-space:pre-wrap;
            word-break:break-word;max-height:60px;overflow:hidden}
.upload-progress{height:5px;background:var(--grey-lt);border-radius:50px;margin-top:.5rem;overflow:hidden}
.upload-progress-fill{height:100%;width:0%;background:var(--brand);border-radius:50px;transition:width .3s}

/* ── Lightbox ───────────────────────────────────────────────── */
.lightbox{display:none;position:fixed;inset:0;background:rgba(0,0,0,.88);z-index:400;
          align-items:center;justify-content:center;flex-direction:column}
.lightbox img{max-width:90vw;max-height:75vh;border-radius:10px;box-shadow:0 10px 40px rgba(0,0,0,.6)}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer{text-align:center;padding:1.1rem;font-size:.78rem;color:var(--grey);
             border-top:1px solid var(--grey-lt);background:var(--white)}

/* ── Responsive ─────────────────────────────────────────────── */
@media(max-width:768px){
    .sidebar{display:none}
    .main-content{padding:1.1rem}
    .card-grid{grid-template-columns:1fr}
    .navbar{padding:.6rem 1rem}
}