:root{

    --primary:#2563eb;
    --primary-dark:#1d4ed8;

    --success:#16a34a;
    --warning:#f59e0b;
    --danger:#dc2626;

    --bg:#f4f7fb;
    --surface:#ffffff;

    --text:#111827;
    --text-light:#6b7280;

    --border:#e5e7eb;

    --shadow:
        0 4px 20px rgba(0,0,0,.08);

    --radius:20px;

    --header-height:72px;
    --footer-height:75px;
}

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

html,
body{
    height:100%;
}

body{
    font-family:
        Inter,
        system-ui,
        -apple-system,
        sans-serif;

    background:var(--bg);
    color:var(--text);
}

a{
    text-decoration:none;
    color:inherit;
}

img{
    max-width:100%;
}

.app{
    width:100%;
    max-width:600px;
    margin:auto;
    min-height:100vh;
    background:var(--bg);
    position:relative;
}

.app-header{
    position:sticky;
    top:0;

    height:var(--header-height);

    background:white;

    display:flex;
    align-items:center;
    justify-content:space-between;

    padding:0 20px;

    border-bottom:1px solid var(--border);

    z-index:1000;
}

.app-header-left{
    display:flex;
    align-items:center;
    gap:12px;
}

.app-logo{
    width:42px;
    height:42px;
    border-radius:12px;
    object-fit:cover;
}

.app-title{
    font-size:1rem;
    font-weight:700;
}

.app-subtitle{
    font-size:.8rem;
    color:var(--text-light);
}

.app-header-action{
    font-size:1.4rem;
}

.app-content{
    padding:20px;
    padding-bottom:100px;
}

.card{
    background:white;
    border-radius:var(--radius);
    padding:18px;
    margin-bottom:16px;
    box-shadow:var(--shadow);
}

.card-title{
    font-size:1rem;
    font-weight:700;
    margin-bottom:8px;
}

.card-subtitle{
    color:var(--text-light);
    font-size:.9rem;
}

.status{
    display:inline-flex;
    align-items:center;
    gap:8px;

    padding:8px 14px;

    border-radius:999px;

    font-size:.85rem;
    font-weight:600;
}

.status-success{
    background:#dcfce7;
    color:#166534;
}

.status-danger{
    background:#fee2e2;
    color:#991b1b;
}

.btn{
    width:100%;

    border:none;

    cursor:pointer;

    display:block;

    text-align:center;

    padding:14px;

    border-radius:14px;

    font-weight:600;
}

.btn-primary{
    background:var(--primary);
    color:white;
}

.list-card{
    display:flex;
    justify-content:space-between;
    align-items:center;
}

.list-card-arrow{
    font-size:1.4rem;
    color:var(--text-light);
}

.center{
    text-align:center;
}

.mt-10{
    margin-top:10px;
}

.mt-20{
    margin-top:20px;
}

.mb-20{
    margin-bottom:20px;
}

/* CARNET */

.qr-card{
    text-align:center;
}

.qr-image{
    width:100%;
    max-width:300px;
}

.member-name{
    font-size:1.25rem;
    font-weight:700;
    margin-bottom:6px;
}

.member-number{
    color:var(--text-light);
    font-size:.9rem;
}

.student-row{
    padding:14px 0;
    border-bottom:1px solid var(--border);
}

.student-row:last-child{
    border-bottom:none;
}

.student-name{
    font-weight:600;
}

.student-group{
    color:var(--text-light);
    font-size:.9rem;
    margin-top:3px;
}

/* NAVEGACIÓN */

.bottom-nav{
    position:fixed;

    bottom:0;
    left:0;
    right:0;

    max-width:600px;

    margin:auto;

    height:var(--footer-height);

    background:white;

    border-top:1px solid var(--border);

    display:flex;

    z-index:1000;
}

.bottom-nav a{
    flex:1;

    display:flex;

    flex-direction:column;

    justify-content:center;

    align-items:center;

    gap:4px;

    color:var(--text-light);

    font-size:.75rem;
}

.bottom-nav a.active{
    color:var(--primary);
    font-weight:600;
}

.nav-icon{
    font-size:1.2rem;
}

/* ==========================================
   ESTADÍSTICAS ADMIN
========================================== */

.stats-grid{

    display:grid;

    grid-template-columns:1fr 1fr;

    gap:12px;

    margin-bottom:12px;
}

.stat-card{

    text-align:center;
}

.stat-number{

    font-size:2rem;

    font-weight:700;

    color:var(--primary);
}

.stat-label{

    margin-top:5px;

    color:var(--text-light);

    font-size:.9rem;
}
/* ==========================================
   FORMULARIOS
========================================== */

.form-group{

    margin-bottom:18px;
}

.form-group label{

    display:block;

    margin-bottom:8px;

    font-weight:600;
}

.form-input{

    width:100%;

    padding:14px;

    border:1px solid var(--border);

    border-radius:14px;

    font-size:1rem;
}

.form-input:focus{

    outline:none;

    border-color:var(--primary);
}

/* ==========================================
   ALERTAS
========================================== */

.alert{

    padding:16px;

    border-radius:16px;

    margin-bottom:16px;
}

.alert-success{

    background:#dcfce7;

    color:#166534;
}

.alert-danger{

    background:#fee2e2;

    color:#991b1b;
}
/* ==========================================
   QR
========================================== */

.qr-placeholder{

    width:260px;
    height:260px;

    margin:auto;

    border-radius:20px;

    border:2px dashed var(--border);

    display:flex;

    align-items:center;

    justify-content:center;

    font-size:2rem;

    font-weight:700;

    color:var(--text-light);
}

.validation-url{

    margin-top:10px;

    word-break:break-all;

    font-size:.85rem;

    color:var(--text-light);
}
/* ==========================================
   VALIDACIÓN QR
========================================== */

.validation-card{

    text-align:center;
}

.validation-icon{

    font-size:4rem;

    margin-bottom:15px;
}

.validation-success{

    color:var(--success);
}

.validation-error{

    color:var(--danger);
}

.validation-title{

    font-size:1.4rem;

    font-weight:700;

    margin-bottom:8px;
}
/* ==========================================
   CHECKBOX
========================================== */

.checkbox-row{

    display:flex;

    align-items:center;

    gap:12px;

    padding:10px 0;

    cursor:pointer;
}

.checkbox-row input{

    width:18px;
    height:18px;
}