/* ==============================================
   students.css  —  place in:  css/students.css
   ============================================== */

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

:root {
    --primary-dark:   #0a192f;
    --secondary-dark: #112240;
    --card-dark:      #16213e;
    --accent-teal:    #2afadf;
    --accent-purple:  #8a2be2;
    --accent-pink:    #ff2e63;
    --accent-amber:   #ff9a3c;
    --accent-gold:    #ffd700;
    --accent-red:     #ff4444;
    --accent-blue:    #4fc3f7;
    --text-primary:   #e6f1ff;
    --text-secondary: #a8b2d1;
    --text-muted:     #8892b0;
    --grad-main:  linear-gradient(135deg, #8a2be2, #2afadf);
    --grad-warm:  linear-gradient(135deg, #ff2e63, #ff9a3c);
    --grad-gold:  linear-gradient(135deg, #f7971e, #ffd200);
    --grad-red:   linear-gradient(135deg, #ff4444, #ff2e63);
    --grad-blue:  linear-gradient(135deg, #1a6fc4, #4fc3f7);
    --shadow-lg:  0 10px 40px rgba(0,0,0,.35);
    --glow:       0 0 22px rgba(42,250,223,.28);
    --glow-gold:  0 0 22px rgba(255,215,0,.35);
    --glow-red:   0 0 22px rgba(255,68,68,.35);
    --glow-blue:  0 0 22px rgba(79,195,247,.28);
    --r-md: 12px;
    --r-lg: 20px;
    --ease: 0.3s cubic-bezier(.4,0,.2,1);
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--primary-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ── Background particles ─────────────────────────────────── */
.bg-animation { position:fixed; inset:0; z-index:-1; overflow:hidden; pointer-events:none; }
.bg-particle  { position:absolute; border-radius:50%; opacity:.07; animation:bgFloat 22s infinite linear; }
.bg-particle:nth-child(1){ width:320px;height:320px;top:5%;left:3%;    background:var(--grad-main); }
.bg-particle:nth-child(2){ width:220px;height:220px;top:58%;right:7%;  background:var(--grad-warm); animation-delay:-7s; }
.bg-particle:nth-child(3){ width:170px;height:170px;bottom:12%;left:20%;background:linear-gradient(135deg,#00d4ff,#7bf1a8); animation-delay:-14s; }
@keyframes bgFloat{
    0%,100%{ transform:translate(0,0) rotate(0deg); }
    25%     { transform:translate(50px,50px) rotate(90deg); }
    50%     { transform:translate(0,100px) rotate(180deg); }
    75%     { transform:translate(-50px,50px) rotate(270deg); }
}

/* ── Navbar ───────────────────────────────────────────────── */
.navbar {
    position:fixed; top:0; width:100%;
    background:rgba(10,25,47,.95);
    backdrop-filter:blur(10px);
    border-bottom:1px solid rgba(42,250,223,.1);
    z-index:1000; padding:1rem 0;
}
.nav-container {
    max-width:1200px; margin:0 auto; padding:0 2rem;
    display:flex; justify-content:space-between; align-items:center;
}
.logo { display:flex; align-items:center; gap:12px; text-decoration:none; }
.logo-icon { font-size:2rem; color:var(--accent-teal); }
.logo-text  { display:flex; flex-direction:column; }
.logo-main  { font-family:'Poppins',sans-serif; font-size:1.8rem; font-weight:700; background:var(--grad-main); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.logo-sub   { font-size:.75rem; color:var(--text-secondary); letter-spacing:2px; text-transform:uppercase; }
.nav-links  { display:flex; align-items:center; gap:1rem; }
.nav-link-btn {
    display:flex; align-items:center; gap:8px;
    text-decoration:none; color:var(--text-secondary);
    font-weight:500; padding:.5rem 1rem;
    border-radius:var(--r-md); background:none; border:none;
    cursor:pointer; font-size:1rem; font-family:'Inter',sans-serif;
    transition:var(--ease);
}
.nav-link-btn:hover { color:var(--text-primary); background:rgba(42,250,223,.1); }
.nav-user-badge {
    display:flex; align-items:center; gap:8px;
    padding:.4rem 1rem;
    background:rgba(42,250,223,.1);
    border:1px solid rgba(42,250,223,.2);
    border-radius:30px; color:var(--accent-teal);
    font-size:.9rem; font-weight:600;
}

/* ── Active nav link — colored text only, no background ───── */
.nav-active {
    background: none !important;
    border-radius: var(--r-md);
}
a.nav-active[href="students.html"]    { color: var(--accent-purple) !important; }
a.nav-active[href="attendance.html"]  { color: var(--accent-teal)   !important; }
a.nav-active[href="submissions.html"] { color: var(--accent-blue)   !important; }
a.nav-active[href="marks.html"]       { color: var(--accent-amber)  !important; }
a.nav-active[href="highlights.html"]  { color: var(--accent-gold)   !important; }
a.nav-active[href="planner.html"]     { color: #00e5ff              !important; }

/* ── Hamburger button ─────────────────────────────────────── */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px; height: 40px;
    background: none;
    border: 1px solid rgba(42,250,223,.2);
    border-radius: var(--r-md);
    cursor: pointer;
    transition: var(--ease);
    padding: 0;
    flex-shrink: 0;
}
.nav-hamburger:hover { border-color:var(--accent-teal); background:rgba(42,250,223,.08); }
.nav-hamburger span {
    display: block; width: 18px; height: 2px;
    background: var(--text-secondary);
    border-radius: 2px; transition: var(--ease);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Main layout ──────────────────────────────────────────── */
.main { padding:7rem 2rem 4rem; max-width:1200px; margin:0 auto; }

/* ── Login gate ───────────────────────────────────────────── */
.login-gate { text-align:center; padding:6rem 2rem; }
.login-gate > i { font-size:4rem; color:rgba(42,250,223,.2); margin-bottom:1.5rem; display:block; }
.login-gate h2 { font-family:'Poppins',sans-serif; font-size:2rem; color:var(--text-secondary); margin-bottom:.8rem; }
.login-gate p  { color:var(--text-muted); margin-bottom:2rem; font-size:1.05rem; }
.btn-login-gate {
    display:inline-flex; align-items:center; gap:10px;
    padding:1rem 2rem; background:var(--grad-main);
    border:none; border-radius:var(--r-md); color:#fff;
    font-weight:700; font-size:1rem; font-family:'Inter',sans-serif;
    cursor:pointer; transition:var(--ease);
}
.btn-login-gate:hover { transform:translateY(-3px); box-shadow:var(--glow); }

/* ── Page header ──────────────────────────────────────────── */
.page-header { margin-bottom:2.5rem; }
.page-header h1 {
    font-family:'Poppins',sans-serif; font-size:2.5rem; font-weight:800;
    background:var(--grad-main); -webkit-background-clip:text;
    -webkit-text-fill-color:transparent; background-clip:text;
    display:flex; align-items:center; gap:.8rem;
}
.page-header h1 i { -webkit-text-fill-color:var(--accent-teal); font-size:2.2rem; }
.page-header p { color:var(--text-secondary); margin-top:.5rem; font-size:1.05rem; }

/* ── Stats bar ────────────────────────────────────────────── */
.stats-bar {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(130px,1fr));
    gap:1rem; margin-bottom:2rem;
}
.stat-card {
    background:rgba(22,33,62,.7);
    border:1px solid rgba(42,250,223,.1);
    border-radius:var(--r-md); padding:1.2rem 1rem;
    text-align:center; backdrop-filter:blur(10px);
    transition:var(--ease);
}
.stat-card:hover { border-color:rgba(42,250,223,.3); transform:translateY(-3px); }
.stat-card--gold { border-color:rgba(255,215,0,.15); }
.stat-card--gold:hover { border-color:rgba(255,215,0,.4); box-shadow:var(--glow-gold); }
.stat-card--red  { border-color:rgba(255,68,68,.15); }
.stat-card--red:hover  { border-color:rgba(255,68,68,.4); box-shadow:var(--glow-red); }
.stat-number  { font-family:'Poppins',sans-serif; font-size:2rem; font-weight:700; color:var(--accent-teal); }
.stat-gold    { color:var(--accent-gold) !important; }
.stat-red     { color:var(--accent-red)  !important; }
.stat-label   { font-size:.75rem; color:var(--text-muted); text-transform:uppercase; letter-spacing:1px; margin-top:.3rem; }

/* ── Controls bar ─────────────────────────────────────────── */
.controls-bar { display:flex; gap:1rem; margin-bottom:2rem; flex-wrap:wrap; align-items:center; }
.search-wrap { position:relative; flex:1; min-width:220px; }
.search-wrap > i { position:absolute; left:.9rem; top:50%; transform:translateY(-50%); color:var(--text-muted); pointer-events:none; }
.search-input {
    width:100%; padding:.8rem 1rem .8rem 2.8rem;
    background:rgba(22,33,62,.8);
    border:1px solid rgba(42,250,223,.15);
    border-radius:var(--r-md); color:var(--text-primary);
    font-size:1rem; font-family:'Inter',sans-serif;
    outline:none; transition:var(--ease);
}
.search-input:focus { border-color:var(--accent-teal); box-shadow:0 0 0 3px rgba(42,250,223,.08); }
.search-input::placeholder { color:var(--text-muted); }
.btn-add {
    display:inline-flex; align-items:center; gap:8px;
    padding:.8rem 1.5rem; background:var(--grad-main);
    border:none; border-radius:var(--r-md); color:#fff;
    font-weight:600; font-family:'Inter',sans-serif;
    font-size:1rem; cursor:pointer; transition:var(--ease); white-space:nowrap;
}
.btn-add:hover { transform:translateY(-2px); box-shadow:var(--glow); }

/* ── Students grid ────────────────────────────────────────── */
.students-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(320px,1fr)); gap:1.5rem; }

/* ── Student card ─────────────────────────────────────────── */
.student-card {
    background:rgba(22,33,62,.7);
    border:1px solid rgba(42,250,223,.1);
    border-radius:var(--r-lg); padding:1.5rem;
    backdrop-filter:blur(10px); transition:var(--ease);
    position:relative; overflow:hidden;
}
.student-card::before {
    content:''; position:absolute; top:0; left:0;
    width:100%; height:3px; background:var(--grad-main);
    transition:var(--ease);
}
.student-card:hover { transform:translateY(-5px); border-color:rgba(42,250,223,.3); box-shadow:var(--glow); }
.student-card.is-highlighted { border-color:rgba(255,215,0,.45); background:rgba(30,28,10,.75); }
.student-card.is-highlighted::before { background:var(--grad-gold); }
.student-card.is-highlighted:hover   { box-shadow:var(--glow-gold); }
.student-card.is-warned { border-color:rgba(255,68,68,.45); background:rgba(30,10,10,.75); }
.student-card.is-warned::before { background:var(--grad-red); }
.student-card.is-warned:hover   { box-shadow:var(--glow-red); }

/* ── Card top row ─────────────────────────────────────────── */
.card-top { display:flex; align-items:center; gap:1rem; margin-bottom:1.2rem; }
.student-avatar {
    width:60px; height:60px; border-radius:50%;
    object-fit:cover; border:2px solid rgba(42,250,223,.3); flex-shrink:0;
}
.student-avatar-placeholder {
    width:60px; height:60px; border-radius:50%;
    background:var(--grad-main); display:flex;
    align-items:center; justify-content:center;
    font-size:1.4rem; font-weight:700; color:#fff; flex-shrink:0;
}
.student-info { flex:1; min-width:0; }
.student-name { font-family:'Poppins',sans-serif; font-weight:600; font-size:1.05rem; color:var(--text-primary); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.student-roll { font-size:.85rem; color:var(--accent-teal); font-weight:500; margin-top:3px; }
.card-actions { display:flex; gap:.4rem; flex-shrink:0; }
.btn-icon {
    width:34px; height:34px; border-radius:8px;
    border:1px solid rgba(42,250,223,.2); background:none;
    color:var(--text-muted); cursor:pointer;
    display:flex; align-items:center; justify-content:center;
    transition:var(--ease); font-size:.85rem;
}
.btn-icon:hover        { color:var(--accent-teal); border-color:var(--accent-teal); background:rgba(42,250,223,.1); }
.btn-icon.danger:hover { color:var(--accent-pink);  border-color:var(--accent-pink);  background:rgba(255,46,99,.1); }
.btn-icon.marks-btn:hover { color:var(--accent-blue); border-color:var(--accent-blue); background:rgba(79,195,247,.1); }
.btn-icon.marks-btn.has-marks { color:var(--accent-blue); border-color:rgba(79,195,247,.4); background:rgba(79,195,247,.08); }

/* ── Section divider labels ───────────────────────────────── */
.section-label {
    font-size:.72rem; font-weight:700; text-transform:uppercase;
    letter-spacing:1.5px; color:var(--text-muted);
    margin:.9rem 0 .4rem;
    display:flex; align-items:center; gap:.4rem;
}
.section-label i { font-size:.7rem; }

/* ── Assignment rows ──────────────────────────────────────── */
.assignments { display:flex; flex-direction:column; gap:.5rem; }
.assignment-row {
    display:flex; align-items:center; justify-content:space-between;
    padding:.6rem .9rem; background:rgba(10,25,47,.5);
    border-radius:10px; border:1px solid rgba(42,250,223,.07);
}
.assignment-label { display:flex; align-items:center; gap:.6rem; font-size:.88rem; color:var(--text-secondary); }
.assignment-label i { color:var(--text-muted); font-size:.82rem; }
.assignment-right   { display:flex; align-items:center; gap:.6rem; }
.toggle-switch { position:relative; width:44px; height:24px; cursor:pointer; }
.toggle-switch input { opacity:0; width:0; height:0; position:absolute; }
.toggle-slider {
    position:absolute; inset:0;
    background:rgba(42,250,223,.1);
    border-radius:24px; border:1px solid rgba(42,250,223,.2);
    transition:var(--ease);
}
.toggle-slider::before {
    content:''; position:absolute;
    width:18px; height:18px; left:2px; bottom:2px;
    background:var(--text-muted); border-radius:50%; transition:var(--ease);
}
.toggle-switch input:checked + .toggle-slider { background:rgba(42,250,223,.25); border-color:var(--accent-teal); }
.toggle-switch input:checked + .toggle-slider::before { transform:translateX(20px); background:var(--accent-teal); }
.status-badge   { font-size:.72rem; font-weight:600; padding:2px 9px; border-radius:20px; }
.status-done    { background:rgba(42,250,223,.12); color:var(--accent-teal); border:1px solid rgba(42,250,223,.3); }
.status-pending { background:rgba(255,154,60,.12); color:var(--accent-amber); border:1px solid rgba(255,154,60,.3); }

/* ── Marks mini-display on card ───────────────────────────── */
.marks-strip { display:grid; grid-template-columns:repeat(4,1fr); gap:.4rem; margin-top:.1rem; }
.mark-chip { background:rgba(10,25,47,.6); border:1px solid rgba(79,195,247,.12); border-radius:8px; padding:.4rem .3rem; text-align:center; }
.mark-chip-label { font-size:.62rem; color:var(--text-muted); display:block; }
.mark-chip-value { font-size:.88rem; font-weight:700; color:var(--accent-blue); display:block; margin-top:2px; }
.mark-chip-value.empty { color:var(--text-muted); font-weight:400; font-size:.8rem; }

/* ── Highlight + Warnings section ────────────────────────── */
.hw-section {
    margin-top:.8rem; padding:.7rem .9rem;
    background:rgba(10,25,47,.45); border-radius:10px;
    border:1px solid rgba(42,250,223,.07);
    display:flex; align-items:center; justify-content:space-between; gap:.6rem; flex-wrap:wrap;
}
.btn-highlight {
    display:inline-flex; align-items:center; gap:6px;
    padding:.32rem .85rem; border-radius:20px;
    border:1px solid rgba(255,215,0,.25);
    background:rgba(255,215,0,.07); color:rgba(255,215,0,.55);
    font-size:.8rem; font-weight:600; font-family:'Inter',sans-serif;
    cursor:pointer; transition:var(--ease);
}
.btn-highlight:hover { background:rgba(255,215,0,.15); color:var(--accent-gold); border-color:rgba(255,215,0,.5); }
.btn-highlight.active { background:rgba(255,215,0,.2); color:var(--accent-gold); border-color:var(--accent-gold); box-shadow:0 0 12px rgba(255,215,0,.2); }
.warning-area { display:flex; align-items:center; gap:.5rem; }
.warning-label { font-size:.8rem; color:var(--text-muted); font-weight:500; }
.warning-dots  { display:flex; gap:5px; }
.w-dot {
    width:20px; height:20px; border-radius:50%;
    border:2px solid rgba(255,68,68,.3); background:rgba(255,68,68,.05);
    cursor:pointer; transition:var(--ease);
}
.w-dot:hover  { border-color:rgba(255,68,68,.7); background:rgba(255,68,68,.15); }
.w-dot.filled { background:rgba(255,68,68,.8); border-color:var(--accent-red); box-shadow:0 0 8px rgba(255,68,68,.4); }
.w-dot.filled:hover { transform:scale(1.2); }
.warn-badge { font-size:.72rem; font-weight:700; padding:2px 7px; border-radius:20px; background:rgba(255,68,68,.15); color:#ff6b6b; border:1px solid rgba(255,68,68,.35); }
.warn-badge.max { background:rgba(255,68,68,.35); color:#fff; box-shadow:0 0 10px rgba(255,68,68,.3); animation:warnPulse 1.4s infinite; }
@keyframes warnPulse { 0%,100%{ opacity:1; } 50%{ opacity:.6; } }

/* ── Empty state ──────────────────────────────────────────── */
.empty-state { text-align:center; padding:4rem 2rem; color:var(--text-muted); }
.empty-state > i { font-size:3rem; margin-bottom:1rem; display:block; color:rgba(42,250,223,.2); }
.empty-state h3  { font-family:'Poppins',sans-serif; font-size:1.3rem; color:var(--text-secondary); margin-bottom:.5rem; }

/* ── Modals ───────────────────────────────────────────────── */
.modal-overlay {
    display:none; position:fixed; inset:0;
    background:rgba(0,0,0,.76); backdrop-filter:blur(6px);
    z-index:2000; align-items:center; justify-content:center; padding:1rem;
}
.modal-overlay.active { display:flex; }
.auth-modal {
    background:var(--secondary-dark);
    border:1px solid rgba(42,250,223,.2);
    border-radius:var(--r-lg); padding:2.5rem;
    width:100%; max-width:420px;
    box-shadow:var(--shadow-lg);
    animation:modalPop .25s ease;
    max-height:90vh; overflow-y:auto;
}
.student-modal { max-width:480px; }
.delete-modal  { max-width:400px; }
.marks-modal   { max-width:500px; }
@keyframes modalPop {
    from { opacity:0; transform:translateY(20px) scale(.97); }
    to   { opacity:1; transform:translateY(0) scale(1); }
}
.modal-header { text-align:center; margin-bottom:1.8rem; }
.modal-header h2 {
    font-family:'Poppins',sans-serif; font-size:1.7rem; font-weight:700;
    background:var(--grad-main); -webkit-background-clip:text;
    -webkit-text-fill-color:transparent; background-clip:text;
}
.danger-title { background:none !important; -webkit-text-fill-color:#ff6b8a !important; }
.modal-header p { color:var(--text-secondary); margin-top:.4rem; font-size:.95rem; }
.modal-tabs {
    display:flex; gap:.4rem; margin-bottom:1.5rem;
    background:rgba(10,25,47,.5); border-radius:var(--r-md); padding:4px;
}
.modal-tab {
    flex:1; padding:.6rem; text-align:center;
    border:none; border-radius:10px; cursor:pointer;
    font-family:'Inter',sans-serif; font-weight:600; font-size:.9rem;
    transition:var(--ease); background:none; color:var(--text-muted);
}
.modal-tab.active { background:var(--grad-main); color:#fff; }
.auth-error {
    background:rgba(255,46,99,.1); border:1px solid rgba(255,46,99,.3);
    border-radius:var(--r-md); padding:.8rem 1rem;
    color:#ff6b8a; font-size:.9rem; margin-bottom:1rem; display:none;
}
.auth-error.show { display:block; }
.form-group { margin-bottom:1.2rem; }
.form-group label { display:block; color:var(--text-secondary); font-size:.9rem; margin-bottom:.5rem; font-weight:500; }
.required { color:var(--accent-pink); }
.mark-max { color:var(--text-muted); font-size:.82rem; font-weight:400; }
.form-input {
    width:100%; padding:.85rem 1rem;
    background:rgba(10,25,47,.7);
    border:1px solid rgba(42,250,223,.15);
    border-radius:var(--r-md); color:var(--text-primary);
    font-size:1rem; font-family:'Inter',sans-serif;
    transition:var(--ease); outline:none;
}
.form-input:focus { border-color:var(--accent-teal); box-shadow:0 0 0 3px rgba(42,250,223,.1); }
.form-input::placeholder { color:var(--text-muted); }
.btn-auth {
    width:100%; padding:.9rem;
    background:var(--grad-main); border:none;
    border-radius:var(--r-md); color:#fff;
    font-weight:700; font-size:1rem; font-family:'Inter',sans-serif;
    cursor:pointer; transition:var(--ease); margin-top:.5rem;
    display:flex; align-items:center; justify-content:center; gap:8px;
}
.btn-auth:hover { transform:translateY(-2px); box-shadow:var(--glow); }
.btn-auth:disabled { opacity:.6; cursor:not-allowed; transform:none; }
.modal-buttons { display:flex; gap:.8rem; margin-top:.5rem; }
.modal-buttons .btn-auth { flex:1; margin-top:0; }
.btn-cancel {
    flex:.55; padding:.9rem;
    background:rgba(136,146,176,.1);
    border:1px solid rgba(136,146,176,.2);
    border-radius:var(--r-md); color:var(--text-secondary);
    font-weight:600; font-size:1rem; font-family:'Inter',sans-serif;
    cursor:pointer; transition:var(--ease);
    display:flex; align-items:center; justify-content:center; gap:8px;
}
.btn-cancel:hover { background:rgba(136,146,176,.2); color:var(--text-primary); }
.btn-danger {
    flex:1; padding:.9rem;
    background:rgba(255,46,99,.15);
    border:1px solid rgba(255,46,99,.4);
    border-radius:var(--r-md); color:#ff6b8a;
    font-weight:700; font-size:1rem; font-family:'Inter',sans-serif;
    cursor:pointer; transition:var(--ease);
    display:flex; align-items:center; justify-content:center; gap:8px;
}
.btn-danger:hover { background:rgba(255,46,99,.3); box-shadow:0 0 20px rgba(255,46,99,.2); }

/* ── Marks modal specifics ────────────────────────────────── */
.marks-grid { display:grid; grid-template-columns:1fr 1fr; gap:1rem; margin-bottom:1.2rem; }
.marks-total-row {
    display:flex; align-items:center; justify-content:center; gap:.6rem;
    padding:.8rem 1rem;
    background:rgba(79,195,247,.07);
    border:1px solid rgba(79,195,247,.2);
    border-radius:var(--r-md); margin-bottom:1rem;
}
.marks-total-label { font-size:.9rem; color:var(--text-secondary); font-weight:600; }
.marks-total-value { font-family:'Poppins',sans-serif; font-size:1.6rem; font-weight:700; color:var(--accent-blue); }

/* ── Avatar upload ────────────────────────────────────────── */
.avatar-upload-area { display:flex; flex-direction:column; align-items:center; gap:.8rem; margin-bottom:1.5rem; }
.avatar-preview {
    width:90px; height:90px; border-radius:50%;
    border:2px dashed rgba(42,250,223,.35);
    display:flex; align-items:center; justify-content:center;
    color:var(--text-muted); font-size:1.8rem;
    overflow:hidden; background:rgba(10,25,47,.5);
    cursor:pointer; transition:var(--ease);
}
.avatar-preview:hover { border-color:var(--accent-teal); color:var(--accent-teal); }
.avatar-preview img { width:100%; height:100%; object-fit:cover; }
.avatar-upload-btn {
    font-size:.85rem; color:var(--accent-teal);
    cursor:pointer; background:none; border:none;
    font-family:'Inter',sans-serif;
    display:flex; align-items:center; gap:6px; transition:var(--ease);
}
.avatar-upload-btn:hover { opacity:.75; }
#avatarFileInput { display:none; }

/* ── Spinner ──────────────────────────────────────────────── */
.spinner { display:inline-block; width:16px; height:16px; border:2px solid rgba(255,255,255,.3); border-top-color:#fff; border-radius:50%; animation:spin .6s linear infinite; }
@keyframes spin { to { transform:rotate(360deg); } }

/* ── Toast ────────────────────────────────────────────────── */
.toast {
    position:fixed; bottom:2rem; right:2rem;
    background:var(--secondary-dark);
    border:1px solid rgba(42,250,223,.3);
    border-radius:var(--r-md); padding:1rem 1.5rem;
    color:var(--text-primary); font-size:.95rem;
    z-index:9999; transform:translateY(100px);
    opacity:0; transition:var(--ease);
    display:flex; align-items:center; gap:10px;
    box-shadow:var(--shadow-lg); max-width:320px;
}
.toast.show   { transform:translateY(0); opacity:1; }
.toast i      { color:var(--accent-teal); font-size:1.1rem; }
.toast.error  { border-color:rgba(255,46,99,.3); }
.toast.error i{ color:var(--accent-pink); }

/* ── Profile grid ─────────────────────────────────────────── */
.profile-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(340px,1fr)); gap:1.6rem; }

/* ── Profile card ─────────────────────────────────────────── */
.profile-card {
    background:rgba(22,33,62,.75);
    border:1px solid rgba(42,250,223,.1);
    border-radius:var(--r-lg);
    backdrop-filter:blur(12px);
    transition:var(--ease);
    position:relative; overflow:hidden;
}
.profile-card::before {
    content:''; position:absolute; top:0; left:0;
    width:100%; height:3px; background:var(--grad-main);
}
.profile-card:hover { transform:translateY(-5px); border-color:rgba(42,250,223,.28); box-shadow:var(--glow); }
.profile-card.grade-S { border-color:rgba(255,215,0,.35); }
.profile-card.grade-S::before { background:var(--grad-gold); }
.profile-card.grade-S:hover   { box-shadow:var(--glow-gold); }
.profile-card.grade-A { border-color:rgba(42,250,223,.35); }
.profile-card.grade-B { border-color:rgba(79,195,247,.3); }
.profile-card.grade-B::before { background:var(--grad-blue); }
.profile-card.grade-C { border-color:rgba(255,154,60,.3); }
.profile-card.grade-C::before { background:var(--grad-warm); }
.profile-card.grade-D { border-color:rgba(255,68,68,.35); }
.profile-card.grade-D::before { background:var(--grad-red); }
.profile-card.grade-D:hover   { box-shadow:var(--glow-red); }

/* ── Card header ──────────────────────────────────────────── */
.pc-header { display:flex; align-items:center; gap:1rem; padding:1.4rem 1.4rem .9rem; }
.pc-avatar { width:64px; height:64px; border-radius:50%; object-fit:cover; border:2px solid rgba(42,250,223,.3); flex-shrink:0; }
.pc-avatar-ph { width:64px; height:64px; border-radius:50%; background:var(--grad-main); display:flex; align-items:center; justify-content:center; font-size:1.5rem; font-weight:700; color:#fff; flex-shrink:0; }
.pc-info { flex:1; min-width:0; }
.pc-name { font-family:'Poppins',sans-serif; font-weight:700; font-size:1.08rem; color:var(--text-primary); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.pc-roll { font-size:.8rem; color:var(--accent-teal); margin-top:3px; }
.pc-actions { display:flex; gap:.4rem; flex-shrink:0; }

/* ── Grade badge ──────────────────────────────────────────── */
.pc-grade-badge { display:flex; align-items:center; justify-content:center; width:48px; height:48px; border-radius:50%; font-family:'Poppins',sans-serif; font-size:1.4rem; font-weight:900; flex-shrink:0; border:2px solid; }
.grade-S .pc-grade-badge { background:rgba(255,215,0,.15); color:var(--accent-gold); border-color:var(--accent-gold); box-shadow:0 0 16px rgba(255,215,0,.3); }
.grade-A .pc-grade-badge { background:rgba(42,250,223,.12); color:var(--accent-teal); border-color:var(--accent-teal); box-shadow:0 0 12px rgba(42,250,223,.2); }
.grade-B .pc-grade-badge { background:rgba(79,195,247,.12); color:var(--accent-blue); border-color:var(--accent-blue); }
.grade-C .pc-grade-badge { background:rgba(255,154,60,.12); color:var(--accent-amber); border-color:var(--accent-amber); }
.grade-D .pc-grade-badge { background:rgba(255,68,68,.12); color:#ff6b6b; border-color:var(--accent-red); }
.grade-N .pc-grade-badge { background:rgba(136,146,176,.1); color:var(--text-muted); border-color:rgba(136,146,176,.3); font-size:1rem; }

/* ── Score ring ───────────────────────────────────────────── */
.pc-score-row { display:flex; align-items:center; gap:1rem; padding:0 1.4rem .9rem; }
.pc-score-ring { position:relative; width:80px; height:80px; flex-shrink:0; }
.pc-score-ring svg { transform:rotate(-90deg); }
.ring-bg { fill:none; stroke:rgba(42,250,223,.08); stroke-width:6; }
.ring-fg { fill:none; stroke-width:6; stroke-linecap:round; transition:stroke-dashoffset .8s ease; }
.ring-fg.rS { stroke:var(--accent-gold); }
.ring-fg.rA { stroke:var(--accent-teal); }
.ring-fg.rB { stroke:var(--accent-blue); }
.ring-fg.rC { stroke:var(--accent-amber); }
.ring-fg.rD { stroke:var(--accent-red); }
.ring-fg.rN { stroke:rgba(136,146,176,.35); }
.pc-score-num { position:absolute; inset:0; display:flex; align-items:center; justify-content:center; font-family:'Poppins',sans-serif; font-size:1.05rem; font-weight:800; color:var(--text-primary); }
.pc-score-num span { font-size:.55rem; color:var(--text-muted); margin-top:2px; }

/* ── Metric bars ──────────────────────────────────────────── */
.pc-metrics { flex:1; display:flex; flex-direction:column; gap:.35rem; }
.pc-metric { display:flex; align-items:center; justify-content:space-between; font-size:.8rem; }
.pm-label { color:var(--text-muted); display:flex; align-items:center; gap:.4rem; }
.pm-label i { font-size:.72rem; width:12px; }
.pm-bar-wrap { flex:1; height:5px; background:rgba(42,250,223,.08); border-radius:10px; overflow:hidden; margin:0 .6rem; }
.pm-bar { height:100%; border-radius:10px; transition:width .6s ease; }
.pm-val { font-weight:700; color:var(--text-primary); min-width:32px; text-align:right; }
.pm-bar.att { background:var(--accent-teal); }
.pm-bar.sub { background:var(--accent-blue); }
.pm-bar.mrk { background:#b06aff; }
.pm-bar.beh { background:var(--accent-amber); }

/* ── Card divider ─────────────────────────────────────────── */
.pc-divider { height:1px; background:rgba(42,250,223,.07); margin:0 1.4rem; }

/* ── Info chips ───────────────────────────────────────────── */
.pc-chips { display:flex; gap:.45rem; flex-wrap:wrap; padding:.9rem 1.4rem; }
.pc-chip { display:inline-flex; align-items:center; gap:5px; font-size:.7rem; font-weight:700; padding:3px 9px; border-radius:20px; }
.chip-att    { background:rgba(42,250,223,.1);  color:var(--accent-teal);  border:1px solid rgba(42,250,223,.25); }
.chip-warn   { background:rgba(255,68,68,.1);   color:#ff6b6b;             border:1px solid rgba(255,68,68,.25); }
.chip-hl     { background:rgba(255,215,0,.1);   color:var(--accent-gold);  border:1px solid rgba(255,215,0,.3); }
.chip-sub    { background:rgba(79,195,247,.1);  color:var(--accent-blue);  border:1px solid rgba(79,195,247,.25); }
.chip-marks  { background:rgba(138,43,226,.1);  color:#b06aff;             border:1px solid rgba(138,43,226,.3); }
.chip-nodata { background:rgba(136,146,176,.08); color:var(--text-muted);  border:1px solid rgba(136,146,176,.2); }

/* ── Card nav buttons ─────────────────────────────────────── */
.pc-nav { display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid rgba(42,250,223,.07); }
.pc-nav-btn {
    display:flex; flex-direction:column; align-items:center; gap:4px;
    padding:.8rem .5rem; background:none; border:none;
    color:var(--text-muted); font-size:.65rem; font-weight:700;
    text-transform:uppercase; letter-spacing:.8px;
    cursor:pointer; transition:var(--ease); text-decoration:none;
    border-right:1px solid rgba(42,250,223,.07);
}
.pc-nav-btn:last-child { border-right:none; }
.pc-nav-btn i { font-size:1rem; }
.pc-nav-btn:hover     { color:var(--accent-teal);  background:rgba(42,250,223,.05); }
.pc-nav-btn.att:hover { color:var(--accent-teal); }
.pc-nav-btn.sub:hover { color:var(--accent-blue); }
.pc-nav-btn.mrk:hover { color:#b06aff; }

/* ── Grade filter bar ─────────────────────────────────────── */
.grade-filter-bar { display:flex; gap:.5rem; flex-wrap:wrap; align-items:center; margin-bottom:1.6rem; }
.gf-btn {
    display:inline-flex; align-items:center; gap:6px;
    padding:.45rem .9rem; border-radius:20px;
    border:1px solid rgba(42,250,223,.15);
    background:rgba(22,33,62,.7); color:var(--text-muted);
    font-family:'Inter',sans-serif; font-size:.8rem; font-weight:600;
    cursor:pointer; transition:var(--ease);
}
.gf-btn:hover  { color:var(--text-primary); border-color:rgba(42,250,223,.35); }
.gf-btn.active { background:var(--grad-main); color:#fff; border-color:transparent; }
.gf-btn.gS.active { background:var(--grad-gold); }
.gf-btn.gD.active { background:var(--grad-red); }

/* ── Overview stats bar ───────────────────────────────────── */
.overview-bar { display:grid; grid-template-columns:repeat(auto-fit,minmax(110px,1fr)); gap:.8rem; margin-bottom:2rem; }
.ov-card { background:rgba(22,33,62,.7); border:1px solid rgba(42,250,223,.1); border-radius:var(--r-md); padding:1rem .8rem; text-align:center; transition:var(--ease); }
.ov-card:hover { transform:translateY(-3px); border-color:rgba(42,250,223,.3); }
.ov-card.gold { border-color:rgba(255,215,0,.15); }
.ov-card.red  { border-color:rgba(255,68,68,.15); }
.ov-num        { font-family:'Poppins',sans-serif; font-size:1.8rem; font-weight:800; color:var(--accent-teal); }
.ov-num.gold   { color:var(--accent-gold); }
.ov-num.red    { color:var(--accent-red); }
.ov-num.blue   { color:var(--accent-blue); }
.ov-num.purple { color:#b06aff; }
.ov-lbl { font-size:.68rem; color:var(--text-muted); text-transform:uppercase; letter-spacing:1px; margin-top:.2rem; }

/* ── Skeleton loader ──────────────────────────────────────── */
.skeleton-card { background:rgba(22,33,62,.4); border-radius:var(--r-lg); height:340px; animation:shimmer 1.4s infinite; }
@keyframes shimmer { 0%,100%{ opacity:.4; } 50%{ opacity:.7; } }

/* ── User area — always horizontal ───────────────────────── */
#navUserArea { display:flex; align-items:center; gap:.6rem; }

/* ── Mobile nav panel ─────────────────────────────────────── */
@media (max-width:900px) {
    .nav-hamburger { display:flex; }

    .nav-links {
        display:none;
        position:absolute; top:100%; left:0; right:0;
        flex-direction:column; align-items:stretch;
        background:rgba(10,25,47,.97);
        backdrop-filter:blur(20px);
        -webkit-backdrop-filter:blur(20px);
        border-bottom:1px solid rgba(42,250,223,.12);
        padding:.8rem; gap:.25rem; z-index:999;
    }
    .nav-links.open {
        display:flex;
        animation:navSlideDown .2s ease both;
    }
    @keyframes navSlideDown {
        from { opacity:0; transform:translateY(-6px); }
        to   { opacity:1; transform:translateY(0); }
    }
    .nav-links .nav-link-btn { width:100%; justify-content:flex-start; padding:.7rem 1rem; border-radius:var(--r-md); }
    .nav-links #navUserArea {
        display:flex; flex-direction:row; align-items:center;
        gap:.6rem; flex-wrap:nowrap;
        padding-top:.6rem; border-top:1px solid rgba(42,250,223,.08); margin-top:.3rem;
    }
    .nav-links #navUserArea .nav-link-btn { flex:1; justify-content:center; }
}

/* ── Responsive ───────────────────────────────────────────── */
@media(max-width:768px){
    .students-grid  { grid-template-columns:1fr; }
    .controls-bar   { flex-direction:column; }
    .page-header h1 { font-size:2rem; }
    .auth-modal     { padding:1.8rem; }
    .hw-section     { flex-direction:column; align-items:flex-start; gap:.7rem; }
    .marks-grid     { grid-template-columns:1fr; }
    .marks-strip    { grid-template-columns:repeat(2,1fr); }
    .profile-grid   { grid-template-columns:1fr; }
    .grade-filter-bar { flex-wrap:nowrap; overflow-x:auto; padding-bottom:.3rem; }
}
@media(max-width:480px){
    .main          { padding:6rem 1rem 3rem; }
    .nav-container { padding:0 1rem; }
    .stats-bar     { grid-template-columns:1fr 1fr; }
    .overview-bar  { grid-template-columns:repeat(3,1fr); }
    .pc-nav        { grid-template-columns:repeat(3,1fr); }
}