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

/* ── Reset & base ─────────────────────────────────────── */
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',sans-serif;background:#F1F5F9;color:#1E293B;min-height:100vh}

/* ── Brand tokens ─────────────────────────────────────── */
:root{
  --navy:#1E293B; --blue:#2563EB; --blue-hover:#1D4ED8;
  --blue-light:#DBEAFE; --blue-text:#1E40AF; --cyan:#22C55E;
  --surface:#F8FAFC; --border:#E2E8F0; --border-soft:#F1F5F9;
  --text-primary:#12355B; --text-secondary:#64748B; --text-muted:#94A3B8;
  --success-bg:#DCFCE7; --success-text:#166534;
  --warn-bg:#FEF3C7;    --warn-text:#92400E;
  --danger-bg:#FEE2E2;  --danger-text:#991B1B;
  --info-bg:#DBEAFE;    --info-text:#1E40AF;
}

/* ── Navbar ───────────────────────────────────────────── */
.navbar{background:var(--navy);display:flex;align-items:center;padding:0 20px;height:54px;position:sticky;top:0;z-index:100;gap:0}
.nav-brand{display:flex;align-items:center;gap:8px;margin-right:20px;text-decoration:none;flex-shrink:0}
.nav-logo-mark{width:30px;height:30px;background:var(--blue);border-radius:7px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.nav-logo-mark svg{width:17px;height:17px}
.nav-title{font-family:'Poppins',sans-serif;font-size:14px;font-weight:700;color:#fff;white-space:nowrap}
.nav-title span{color:var(--cyan)}
.nav-links{display:flex;flex:1;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.nav-links::-webkit-scrollbar{display:none}
.nav-link{padding:0 12px;height:54px;display:flex;align-items:center;font-size:12px;font-weight:500;color:rgba(255,255,255,.6);text-decoration:none;border-bottom:2px solid transparent;transition:all .15s;white-space:nowrap;flex-shrink:0}
.nav-link:hover{color:#fff}
.nav-link.active{color:#fff;border-bottom-color:#22C55E}
.nav-user{display:flex;align-items:center;gap:8px;margin-left:auto;flex-shrink:0}
.nav-avatar{width:28px;height:28px;border-radius:50%;background:var(--blue);display:flex;align-items:center;justify-content:center;font-family:'Poppins',sans-serif;font-size:10px;font-weight:700;color:#fff;flex-shrink:0;overflow:hidden}
.nav-avatar-img{width:28px;height:28px;border-radius:50%;object-fit:cover}
#nav-user-name{font-size:12px;color:rgba(255,255,255,.75)}
.btn-logout{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);border-radius:6px;padding:4px 10px;font-size:11px;cursor:pointer;color:rgba(255,255,255,.8);font-family:'Inter',sans-serif;white-space:nowrap}

/* ── Mobile hamburger menu ────────────────────────────── */
.nav-hamburger{display:none;background:none;border:none;cursor:pointer;padding:8px;color:rgba(255,255,255,.85);flex-shrink:0;align-items:center;justify-content:center}
.nav-hamburger svg{width:22px;height:22px;display:block}
.nav-mobile-menu{display:none;position:fixed;top:54px;left:0;right:0;background:var(--navy);z-index:99;flex-direction:column;border-bottom:1px solid rgba(255,255,255,.1);box-shadow:0 4px 20px rgba(0,0,0,.2)}
.nav-mobile-menu.open{display:flex}
.nav-mobile-link{display:flex;align-items:center;padding:14px 20px;font-size:14px;font-weight:500;color:rgba(255,255,255,.7);text-decoration:none;border-bottom:.5px solid rgba(255,255,255,.08)}
.nav-mobile-link:hover,.nav-mobile-link.active{background:rgba(30,94,255,.15);color:#fff}

/* ── Main layout ──────────────────────────────────────── */
.main-content{max-width:1100px;margin:0 auto;padding:24px 20px}
.page-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:20px;gap:12px;flex-wrap:wrap}
.page-title{font-family:'Poppins',sans-serif;font-size:18px;font-weight:700;color:var(--text-primary)}
.page-sub{font-size:12px;color:var(--text-secondary);margin-top:2px}

/* ── Metric cards ─────────────────────────────────────── */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:20px}
.metric{background:#fff;border-radius:10px;padding:14px 16px;border:.5px solid var(--border)}
.metric-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.metric-label{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary)}
.metric-icon{width:26px;height:26px;border-radius:6px;display:flex;align-items:center;justify-content:center}
.metric-value{font-family:'Poppins',sans-serif;font-size:22px;font-weight:700;color:var(--text-primary);line-height:1}
.metric-value.green{color:#16A34A}
.metric-value.amber{color:#D97706}
.metric-value.red{color:#DC2626}
.metric-sub{font-size:11px;color:var(--text-muted);margin-top:3px}

/* ── Cards ────────────────────────────────────────────── */
.card{background:#fff;border-radius:10px;padding:16px 18px;border:.5px solid var(--border);margin-bottom:12px}
.card-title{font-family:'Poppins',sans-serif;font-size:13px;font-weight:700;color:var(--text-primary);margin-bottom:12px}
.card-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* ── Buttons ──────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;font-family:'Poppins',sans-serif;transition:all .15s;text-decoration:none;border:none;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-hover)}
.btn-ghost{background:#fff;color:var(--text-secondary);border:.5px solid var(--border);font-family:'Inter',sans-serif;font-weight:500}
.btn-ghost:hover{background:var(--surface)}
.btn-danger{background:#FEF2F2;color:#DC2626;border:.5px solid #FECACA;font-family:'Inter',sans-serif;font-weight:500}
.btn-sm{padding:5px 12px;font-size:12px;border-radius:6px}

/* ── Badges ───────────────────────────────────────────── */
.badge{display:inline-block;font-size:11px;padding:3px 8px;border-radius:20px;font-weight:600;white-space:nowrap}
.badge-paid{background:var(--success-bg);color:var(--success-text)}
.badge-upcoming{background:var(--info-bg);color:var(--info-text)}
.badge-due{background:var(--warn-bg);color:var(--warn-text)}
.badge-overdue{background:var(--danger-bg);color:var(--danger-text)}
.badge-dp{background:#E0F2FE;color:#075985}

/* ── Table ────────────────────────────────────────────── */
.table-wrap{overflow-x:auto;border-radius:10px;border:.5px solid var(--border);background:#fff;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:13px;font-family:'Inter',sans-serif;min-width:600px}
thead th{padding:10px 12px;text-align:left;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.4px;color:var(--text-secondary);background:var(--surface);border-bottom:1px solid var(--border);white-space:nowrap}
tbody td{padding:11px 12px;border-bottom:.5px solid var(--border-soft);vertical-align:middle;color:#334155}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:#FAFCFF}
tbody tr.row-overdue td{background:#FFF5F5}
tbody tr.row-due td{background:#FFFBEB}
tbody tr.row-paid{opacity:.72}
.td-name{font-family:'Poppins',sans-serif;font-weight:600;color:var(--text-primary)}
.td-meta{font-size:11px;color:var(--text-muted);margin-top:1px}

/* ── Mobile card-style rows (shown instead of table on mobile) ── */
.payment-card-list{display:none}
.payment-card{background:#fff;border:.5px solid var(--border);border-radius:10px;padding:14px 16px;margin-bottom:10px}
.payment-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.payment-card-body{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:10px}
.payment-card-field{font-size:12px}
.payment-card-label{color:var(--text-muted);font-size:10px;text-transform:uppercase;letter-spacing:.4px;margin-bottom:2px}
.payment-card-value{color:var(--text-primary);font-weight:500}

/* ── Progress bar ─────────────────────────────────────── */
.progress-wrap{display:flex;align-items:center;gap:8px}
.progress-bar{flex:1;height:5px;background:var(--border);border-radius:3px;overflow:hidden}
.progress-fill{height:100%;background:var(--blue);border-radius:3px;transition:width .4s}
.progress-pct{font-family:'Poppins',sans-serif;font-size:12px;font-weight:700;color:var(--blue);min-width:32px;text-align:right}

/* ── Student card ─────────────────────────────────────── */
.student-card{background:#fff;border:.5px solid var(--border);border-radius:12px;padding:18px 20px;margin-bottom:12px;overflow:hidden}
.student-card-header{display:flex;align-items:flex-start;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.student-avatar{width:42px;height:42px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-family:'Poppins',sans-serif;font-weight:700;font-size:14px;flex-shrink:0}
.student-name{font-family:'Poppins',sans-serif;font-size:15px;font-weight:700;color:var(--text-primary)}
.student-meta{font-size:12px;color:var(--text-secondary);margin-top:2px}
.student-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:12px}
.student-stat{background:var(--surface);border-radius:8px;padding:10px 12px}
.student-stat-label{font-size:10px;color:var(--text-secondary);margin-bottom:3px;font-weight:500}
.student-stat-value{font-family:'Poppins',sans-serif;font-size:15px;font-weight:700;color:var(--text-primary)}
.student-stat-value.blue{color:var(--blue)}
.expense-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.expense-tag{background:var(--blue-light);color:var(--blue-text);font-size:11px;padding:3px 8px;border-radius:20px;font-weight:500}

/* ── Due list ─────────────────────────────────────────── */
.due-item{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:.5px solid var(--border-soft);gap:8px}
.due-item:last-child{border-bottom:none}
.due-item-name{font-size:12px;font-weight:600;color:var(--text-primary);font-family:'Poppins',sans-serif}
.due-item-sub{font-size:11px;color:var(--text-secondary);margin-top:1px}

/* ── Forms ────────────────────────────────────────────── */
.form-group{margin-bottom:12px}
label{display:block;font-size:11px;font-weight:600;color:#475569;margin-bottom:5px;text-transform:uppercase;letter-spacing:.5px}
input[type=text],input[type=email],input[type=password],input[type=tel],input[type=number],input[type=date],select,textarea{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:'Inter',sans-serif;color:var(--text-primary);background:#fff;transition:border .15s;outline:none;-webkit-appearance:none;appearance:none}
input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(30,94,255,.08)}
select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748B' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:32px}
textarea{resize:vertical;min-height:80px}
.form-row-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* ── Monthly preview ──────────────────────────────────── */
.monthly-preview{background:var(--blue-light);border-radius:9px;padding:12px 14px;margin-bottom:12px;border:1px solid #BFDBFE}
.preview-label{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.4px;color:var(--blue-text);margin-bottom:4px}
.preview-amount{font-family:'Poppins',sans-serif;font-size:20px;font-weight:700;color:var(--text-primary)}
.preview-note{font-size:11px;color:var(--blue-text);margin-top:2px}

/* ── Expense section ──────────────────────────────────── */
.expense-section{border-top:1px solid var(--border);padding-top:12px}
.expense-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.section-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.4px;color:#475569}
.btn-add-expense{background:none;border:none;color:var(--blue);font-size:12px;font-weight:600;cursor:pointer;font-family:'Inter',sans-serif}
.expense-row-item{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.expense-row-item input{flex:1}
.expense-row-item input:last-of-type{max-width:110px}
.btn-del-expense{background:none;border:none;cursor:pointer;color:#DC2626;font-size:18px;padding:0 4px;line-height:1;flex-shrink:0}

/* ── File upload ──────────────────────────────────────── */
.file-drop{border:1.5px dashed #BFDBFE;border-radius:9px;padding:16px;text-align:center;cursor:pointer;transition:all .15s;background:#FAFCFF}
.file-drop:hover{background:var(--blue-light);border-color:var(--blue)}
.file-drop-icon{font-size:20px;margin-bottom:5px}
.file-drop-text{font-size:13px;font-weight:500;color:#475569}
.file-drop-hint{font-size:11px;color:var(--text-muted);margin-top:2px}
.file-selected-name{font-size:13px;color:var(--blue);font-weight:500}

/* ── Pay summary ──────────────────────────────────────── */
.pay-summary{background:var(--surface);border-radius:9px;padding:12px 14px;margin-bottom:14px;border:.5px solid var(--border)}
.pay-summary-row{display:flex;justify-content:space-between;padding:3px 0;font-size:13px;gap:8px}
.pay-summary-label{color:var(--text-secondary);flex-shrink:0}
.pay-summary-amount{font-family:'Poppins',sans-serif;font-size:20px;font-weight:700;color:var(--text-primary)}

/* ── Modals ───────────────────────────────────────────── */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(18,53,91,.35);z-index:200;align-items:flex-end;justify-content:center;padding:0}
.modal-overlay.open{display:flex}
.modal{background:#fff;border-radius:16px 16px 0 0;width:100%;max-width:100%;max-height:92vh;overflow-y:auto;box-shadow:0 -8px 40px rgba(18,53,91,.15);overflow-x:hidden}
.modal-sm{max-width:100%}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 16px 0;position:sticky;top:0;background:#fff;z-index:1}
.modal-title{font-family:'Poppins',sans-serif;font-size:15px;font-weight:700;color:var(--text-primary)}
.modal-close{background:none;border:none;font-size:22px;cursor:pointer;color:var(--text-muted);padding:0 4px;line-height:1}
.modal-body{padding:14px 16px}
.modal-footer{padding:12px 20px 24px;display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}
.modal-footer .btn{flex:1;justify-content:center;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ── Notifications ────────────────────────────────────── */
.notif-item{display:flex;gap:10px;padding:10px 0;border-bottom:.5px solid var(--border-soft)}
.notif-item:last-child{border-bottom:none}
.notif-icon{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.notif-email{background:var(--blue-light);color:var(--blue-text)}
.notif-sms{background:var(--success-bg);color:var(--success-text)}
.notif-msg{font-size:13px;color:#334155;line-height:1.5}
.notif-meta{font-size:11px;color:var(--text-muted);margin-top:2px}
.notif-urgent .notif-msg{color:#991B1B;font-weight:600}

/* ── Settings ─────────────────────────────────────────── */
.settings-section{background:#fff;border-radius:10px;border:.5px solid var(--border);padding:18px 20px;margin-bottom:12px}
.settings-title{font-family:'Poppins',sans-serif;font-size:13px;font-weight:700;margin-bottom:12px;color:var(--text-primary)}
.toggle-row{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:.5px solid var(--border-soft);gap:12px}
.toggle-row:last-child{border-bottom:none}
.toggle-label{font-size:13px;font-weight:500;color:#334155}
.toggle-sub{font-size:11px;color:var(--text-secondary);margin-top:1px}
.toggle{position:relative;width:40px;height:22px;flex-shrink:0}
.toggle input{opacity:0;width:0;height:0;position:absolute}
.toggle-slider{position:absolute;inset:0;background:#CBD5E1;border-radius:11px;cursor:pointer;transition:.2s}
.toggle-slider::before{content:'';position:absolute;height:16px;width:16px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.15)}
.toggle input:checked+.toggle-slider{background:var(--blue)}
.toggle input:checked+.toggle-slider::before{transform:translateX(18px)}

/* ── Toast ────────────────────────────────────────────── */
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(8px);background:var(--navy);color:#fff;padding:10px 20px;border-radius:9px;font-size:13px;font-weight:500;z-index:1000;opacity:0;transition:all .25s;pointer-events:none;white-space:nowrap;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ── Loading ──────────────────────────────────────────── */
.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;gap:16px;color:var(--text-secondary)}
.loading-spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Empty state ──────────────────────────────────────── */
.empty-state{text-align:center;padding:40px 20px;color:var(--text-secondary)}
.empty-icon{font-size:36px;margin-bottom:10px}
.empty-title{font-family:'Poppins',sans-serif;font-size:14px;font-weight:700;color:#475569;margin-bottom:6px}
.empty-sub{font-size:13px;line-height:1.6}

/* ════════════════════════════════════════════════════════
   MOBILE RESPONSIVE — max-width: 768px
════════════════════════════════════════════════════════ */
@media(max-width:768px){
  /* Navbar — mobile: hamburger left | logo center | avatar right */
  .navbar{padding:0;position:sticky;top:0;z-index:100;height:54px}
  .nav-hamburger{display:flex;order:1;padding:0 14px;height:54px;align-items:center}
  .nav-brand{order:2;position:absolute;left:50%;transform:translateX(-50%);margin:0;height:54px;display:flex;align-items:center;pointer-events:auto}
  .nav-title{display:none}
  .nav-logo-mark{width:34px;height:34px;border-radius:8px}
  .nav-logo-mark svg{width:19px;height:19px}
  .nav-links{display:none}
  .nav-user{order:3;margin-left:auto;padding-right:14px;gap:6px;display:flex;align-items:center}
  #nav-user-name{display:none}
  .btn-logout{display:none}
  /* Fix avatar display on mobile */
  .nav-avatar{width:30px;height:30px;font-size:11px;flex-shrink:0}
  .nav-avatar-img{width:30px;height:30px;border-radius:50%;object-fit:cover;flex-shrink:0}
  /* Mobile menu — no gap, flush under sticky navbar */
  .nav-mobile-menu{top:54px}

  /* Layout */
  .main-content{padding:14px 14px}

  /* Metrics - 2 columns on mobile */
  .metrics{grid-template-columns:1fr 1fr;gap:8px}
  .metric-value{font-size:18px}

  /* Cards */
  .card-grid-2{grid-template-columns:1fr}

  /* Student stats - 2 col on mobile */
  .student-stats{grid-template-columns:1fr 1fr}
  .student-card{padding:12px 14px}
  .student-card-header{gap:8px}
  .student-card-header .btn{padding:5px 10px;font-size:11px}
  .student-name{font-size:14px}

  /* Hide table, show cards on mobile */
  .table-wrap table{min-width:auto}
  .table-wrap{display:none}
  .payment-card-list{display:block}

  /* Forms */
  .form-row-2{grid-template-columns:1fr}

  /* Modals - full bottom sheet */
  .modal-overlay{align-items:flex-end;padding:0}
  .modal{border-radius:16px 16px 0 0;max-height:90vh}
  .modal-body{padding:12px 14px}
  .modal-header{padding:14px 14px 0}
  .modal-footer{padding:10px 14px 20px;gap:8px}
  .modal-footer .btn{flex:1;min-width:0;font-size:12px;padding:9px 10px}

  /* Page header */
  .page-header{flex-direction:column;align-items:flex-start;gap:10px}
  .page-header .btn{align-self:stretch;justify-content:center}

  /* Table select filter */
  .table-filter-row{flex-direction:column;align-items:stretch}
  .table-filter-row select{width:100%}

  /* Due items */
  .due-item{flex-wrap:wrap}
}

@media(max-width:400px){
  .metrics{grid-template-columns:1fr}
  .student-stats{grid-template-columns:1fr 1fr}
}


/* ── PWA Install banner ───────────────────────────────── */
.pwa-banner{position:fixed;bottom:0;left:0;right:0;background:#12355B;color:#fff;padding:14px 16px;display:flex;align-items:center;gap:12px;z-index:999;box-shadow:0 -4px 20px rgba(0,0,0,.2);transform:translateY(100%);transition:transform .3s ease}
.pwa-banner.show{transform:translateY(0)}
.pwa-banner-icon{width:40px;height:40px;background:#1E5EFF;border-radius:9px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:20px}
.pwa-banner-text{flex:1;min-width:0}
.pwa-banner-title{font-family:'Poppins',sans-serif;font-size:13px;font-weight:700}
.pwa-banner-sub{font-size:11px;color:rgba(255,255,255,.7);margin-top:2px}
.pwa-banner-actions{display:flex;gap:8px;flex-shrink:0}
.pwa-btn-install{background:#1E5EFF;color:#fff;border:none;border-radius:7px;padding:8px 14px;font-size:12px;font-weight:600;cursor:pointer;font-family:'Poppins',sans-serif;white-space:nowrap}
.pwa-btn-dismiss{background:rgba(255,255,255,.1);color:rgba(255,255,255,.7);border:none;border-radius:7px;padding:8px 10px;font-size:12px;cursor:pointer;font-family:'Inter',sans-serif}
/* iOS install instructions */
.pwa-ios-modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;align-items:flex-end;justify-content:center}
.pwa-ios-modal.open{display:flex}
.pwa-ios-sheet{background:#fff;border-radius:16px 16px 0 0;padding:24px 20px;width:100%;max-width:500px}
.pwa-ios-title{font-family:'Poppins',sans-serif;font-size:16px;font-weight:700;color:#12355B;margin-bottom:6px}
.pwa-ios-sub{font-size:13px;color:#64748B;margin-bottom:20px;line-height:1.6}
.pwa-ios-steps{display:flex;flex-direction:column;gap:14px;margin-bottom:20px}
.pwa-ios-step{display:flex;align-items:center;gap:12px;font-size:13px;color:#334155}
.pwa-ios-step-num{width:28px;height:28px;background:#1E5EFF;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:'Poppins',sans-serif;font-weight:700;font-size:12px;flex-shrink:0}
.pwa-ios-close{width:100%;padding:12px;background:#12355B;color:#fff;border:none;border-radius:9px;font-size:14px;font-weight:600;font-family:'Poppins',sans-serif;cursor:pointer}
/* ── Theme & font size ────────────────────────────────── */
:root {
  --font-scale: 1;
}
body { font-size: calc(14px * var(--font-scale)); }

/* Dark mode */
body.dark-mode {
  --navy: #1a2744;
  --surface: #1e2533;
  --border: #2d3748;
  --border-soft: #252d3d;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  background: #111827;
  color: #e2e8f0;
}
body.dark-mode .card,
body.dark-mode .metric,
body.dark-mode .student-card,
body.dark-mode .table-wrap,
body.dark-mode .settings-section,
body.dark-mode .modal { background: #1e2533; border-color: #2d3748; }
body.dark-mode thead th { background: #252d3d; color: #94a3b8; }
body.dark-mode tbody tr:hover { background: #252d3d; }
body.dark-mode input, body.dark-mode select, body.dark-mode textarea { background: #252d3d; border-color: #374151; color: #e2e8f0; }
body.dark-mode .navbar { background: #0f172a; }
body.dark-mode .nav-mobile-menu { background: #0f172a; }
body.dark-mode .payment-card { background: #1e2533; border-color: #2d3748; }
body.dark-mode .monthly-preview { background: #1e3a5f; border-color: #1e5eff55; }
body.dark-mode .pwa-banner { background: #0f172a; }
body.dark-mode .btn-ghost { background: #252d3d; color: #94a3b8; border-color: #374151; }
body.dark-mode .empty-state { color: #64748b; }

/* Font size classes */
body.font-sm { font-size: calc(12px * var(--font-scale)); }
body.font-md { font-size: calc(14px * var(--font-scale)); }
body.font-lg { font-size: calc(16px * var(--font-scale)); }
body.font-xl { font-size: calc(18px * var(--font-scale)); }