/* =====================================================
   STUDENTREG v2 — University Institutional Design System
===================================================== */

:root {
  /* Brand */
  --clr-primary:      #1a3a6b;
  --clr-primary-d:    #122952;
  --clr-primary-l:    #2a52a0;
  --clr-accent:       #c8a951;
  --clr-accent-d:     #a8893a;

  /* UI */
  --clr-bg:           #f4f6f9;
  --clr-surface:      #ffffff;
  --clr-sidebar:      #1a3a6b;
  --clr-sidebar-item: rgba(255,255,255,0.08);
  --clr-sidebar-act:  rgba(200,169,81,0.18);

  /* Status */
  --clr-success:      #1e7e4a;
  --clr-success-bg:   #e6f4ec;
  --clr-danger:       #c0392b;
  --clr-danger-bg:    #fdecea;
  --clr-warn:         #d97706;
  --clr-warn-bg:      #fef3c7;
  --clr-info:         #1e6fa8;
  --clr-info-bg:      #e6f2fb;

  /* Text */
  --clr-text:         #1a2332;
  --clr-text-2:       #4a5568;
  --clr-muted:        #718096;
  --clr-border:       #e2e8f0;

  /* Misc */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.14);
  --sidebar-w:  260px;
  --topbar-h:   64px;
  --transition: 180ms ease;

  --font-display: 'Merriweather', Georgia, serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--clr-bg); color: var(--clr-text); line-height: 1.6; }
img  { max-width: 100%; display: block; }
a    { color: var(--clr-primary); text-decoration: none; }

/* =====================================================
   AUTH PAGES (login.html)
===================================================== */
.auth-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.auth-brand {
  background: linear-gradient(160deg, var(--clr-primary) 0%, #0d2347 100%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem;
  position: relative;
  overflow: hidden;
}

.auth-brand::before {
  content: '';
  position: absolute;
  width: 500px; height: 500px;
  background: rgba(200,169,81,.07);
  border-radius: 50%;
  top: -100px; right: -150px;
}

.auth-brand::after {
  content: '';
  position: absolute;
  width: 300px; height: 300px;
  background: rgba(200,169,81,.05);
  border-radius: 50%;
  bottom: -50px; left: -80px;
}

.auth-brand-inner { position: relative; z-index: 1; }

.auth-logo {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 3rem;
}

.auth-logo-icon {
  width: 52px; height: 52px;
  background: var(--clr-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-logo-text { color: #fff; }
.auth-logo-text strong { display: block; font-family: var(--font-display); font-size: 1.2rem; letter-spacing: .01em; }
.auth-logo-text span  { font-size: .78rem; opacity: .7; letter-spacing: .05em; text-transform: uppercase; }

.auth-brand h1 { font-family: var(--font-display); color: #fff; font-size: 2rem; line-height: 1.3; margin-bottom: 1rem; }
.auth-brand p  { color: rgba(255,255,255,.65); font-size: .95rem; line-height: 1.7; max-width: 360px; }

.auth-divider {
  width: 40px; height: 3px;
  background: var(--clr-accent);
  border-radius: 2px;
  margin: 1.5rem 0;
}

.auth-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
}

.auth-stat {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.auth-stat-num   { font-size: 1.6rem; font-weight: 800; color: var(--clr-accent); line-height: 1; }
.auth-stat-label { font-size: .75rem; color: rgba(255,255,255,.6); margin-top: .25rem; letter-spacing: .04em; }

.auth-form-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  background: var(--clr-surface);
}

.auth-form-box { width: 100%; max-width: 400px; }

.auth-form-box h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--clr-primary);
  margin-bottom: .35rem;
}

.auth-form-box .auth-sub {
  color: var(--clr-muted);
  font-size: .88rem;
  margin-bottom: 2rem;
}

.role-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
  margin-bottom: 1.75rem;
  background: var(--clr-bg);
  padding: .35rem;
  border-radius: var(--radius-md);
}

.role-tab {
  padding: .6rem;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: .88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  color: var(--clr-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
}

.role-tab.active {
  background: var(--clr-surface);
  color: var(--clr-primary);
  box-shadow: var(--shadow-sm);
}

/* =====================================================
   FORM ELEMENTS
===================================================== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  margin-bottom: 1.1rem;
}

label {
  font-size: .78rem;
  font-weight: 700;
  color: var(--clr-text-2);
  letter-spacing: .04em;
  text-transform: uppercase;
}

input, select, textarea {
  font-family: var(--font-body);
  font-size: .93rem;
  color: var(--clr-text);
  background: var(--clr-bg);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: .65rem .9rem;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--clr-primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(26,58,107,.1);
}

input.error { border-color: var(--clr-danger); box-shadow: 0 0 0 3px rgba(192,57,43,.1); }

.input-icon-wrap { position: relative; }
.input-icon-wrap svg {
  position: absolute;
  left: .8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--clr-muted);
  pointer-events: none;
}
.input-icon-wrap input { padding-left: 2.4rem; }

.field-error { font-size: .75rem; color: var(--clr-danger); display: none; }
.field-error.show { display: block; }

/* =====================================================
   BUTTONS
===================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 600;
  padding: .65rem 1.4rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  letter-spacing: .01em;
  text-decoration: none;
  white-space: nowrap;
}

.btn:active { transform: scale(.97); }

.btn-primary   { background: var(--clr-primary); color: #fff; }
.btn-primary:hover { background: var(--clr-primary-l); box-shadow: var(--shadow-md); color: #fff; }

.btn-accent    { background: var(--clr-accent); color: #fff; }
.btn-accent:hover { background: var(--clr-accent-d); color: #fff; }

.btn-secondary { background: var(--clr-bg); color: var(--clr-text); border: 1.5px solid var(--clr-border); }
.btn-secondary:hover { background: #edf2f7; }

.btn-danger    { background: var(--clr-danger-bg); color: var(--clr-danger); border: 1.5px solid #f5c6c2; }
.btn-danger:hover { background: var(--clr-danger); color: #fff; }

.btn-full { width: 100%; }
.btn-sm   { padding: .38rem .75rem; font-size: .8rem; }

.btn-icon {
  background: none; border: none;
  padding: .35rem; border-radius: var(--radius-sm);
  cursor: pointer; display: inline-flex;
  align-items: center; justify-content: center;
  transition: background var(--transition), color var(--transition);
  color: var(--clr-muted);
}
.btn-icon:hover        { background: var(--clr-bg); color: var(--clr-text); }
.btn-icon.edit:hover   { background: #e8f0fb; color: var(--clr-primary); }
.btn-icon.delete:hover { background: var(--clr-danger-bg); color: var(--clr-danger); }

/* =====================================================
   DASHBOARD LAYOUT
===================================================== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ── SIDEBAR ── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--clr-sidebar);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 50;
  transition: transform var(--transition);
  overflow-y: auto;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: .65rem;
}

.sidebar-logo-icon {
  width: 38px; height: 38px;
  background: var(--clr-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sidebar-logo-text strong {
  display: block;
  font-family: var(--font-display);
  font-size: .95rem;
  color: #fff;
  letter-spacing: .01em;
}

.sidebar-logo-text span {
  font-size: .7rem;
  color: rgba(255,255,255,.5);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.sidebar-user {
  margin: 1rem 1.25rem;
  padding: .85rem;
  background: rgba(255,255,255,.07);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,.08);
}

.sidebar-user-avatar {
  width: 36px; height: 36px;
  background: var(--clr-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .9rem;
  color: #fff;
  flex-shrink: 0;
}

.sidebar-user-info { display: flex; align-items: center; gap: .65rem; }
.sidebar-user-name { font-size: .85rem; font-weight: 600; color: #fff; }
.sidebar-user-role { font-size: .72rem; color: var(--clr-accent); letter-spacing: .04em; text-transform: uppercase; font-weight: 600; }

.sidebar-nav { flex: 1; padding: .75rem 0; }

.sidebar-section-label {
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: rgba(255,255,255,.3);
  padding: .75rem 1.4rem .35rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .65rem 1.25rem;
  margin: .1rem .75rem;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,.7);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  border: none;
  background: none;
  width: calc(100% - 1.5rem);
  text-align: left;
  text-decoration: none;
}

.sidebar-link:hover { background: var(--clr-sidebar-item); color: #fff; }
.sidebar-link.active { background: var(--clr-sidebar-act); color: var(--clr-accent); }
.sidebar-link.active svg { color: var(--clr-accent); }
.sidebar-link svg { color: rgba(255,255,255,.45); flex-shrink: 0; }
.sidebar-link.active svg { color: var(--clr-accent); }

.sidebar-footer {
  padding: 1rem .75rem;
  border-top: 1px solid rgba(255,255,255,.08);
}

/* ── MAIN AREA ── */
.main-area {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── TOPBAR ── */
.topbar {
  height: var(--topbar-h);
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.topbar-left { display: flex; align-items: center; gap: 1rem; }

.topbar-title { font-size: 1.05rem; font-weight: 700; color: var(--clr-text); font-family: var(--font-display); }
.topbar-breadcrumb { font-size: .8rem; color: var(--clr-muted); }

.topbar-right { display: flex; align-items: center; gap: .75rem; }

.topbar-badge {
  background: var(--clr-primary);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  padding: .2rem .6rem;
  border-radius: 999px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ── PAGE CONTENT ── */
.page-content {
  padding: 2rem;
  flex: 1;
}

/* ── HAMBURGER (mobile) ── */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem;
  flex-direction: column;
  gap: 5px;
}

.hamburger-btn span {
  display: block;
  width: 22px; height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* =====================================================
   CARDS
===================================================== */
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.card-header h2 {
  font-size: .97rem;
  font-weight: 700;
  color: var(--clr-text);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.card-header h2 svg { color: var(--clr-primary); }
.card-body { padding: 1.5rem; }

/* =====================================================
   STAT CARDS (dashboard overview)
===================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--clr-primary);
}

.stat-card.accent::before  { background: var(--clr-accent); }
.stat-card.success::before { background: var(--clr-success); }
.stat-card.info::before    { background: var(--clr-info); }

.stat-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: #e8f0fb;
  color: var(--clr-primary);
}

.stat-card.accent .stat-icon  { background: #fdf3d8; color: var(--clr-accent-d); }
.stat-card.success .stat-icon { background: var(--clr-success-bg); color: var(--clr-success); }
.stat-card.info .stat-icon    { background: var(--clr-info-bg); color: var(--clr-info); }

.stat-num   { font-size: 1.75rem; font-weight: 800; line-height: 1; color: var(--clr-text); }
.stat-label { font-size: .8rem; color: var(--clr-muted); margin-top: .2rem; font-weight: 500; }

/* =====================================================
   TABLE
===================================================== */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .875rem;
}

thead {
  background: #f7f9fc;
  border-bottom: 2px solid var(--clr-border);
}

thead th {
  padding: .7rem 1rem;
  text-align: left;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--clr-muted);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition);
}

tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: #f7f9fc; }

tbody td {
  padding: .85rem 1rem;
  vertical-align: middle;
  color: var(--clr-text-2);
}

tbody td strong { color: var(--clr-text); font-weight: 600; }

.actions-cell { display: flex; gap: .3rem; }

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--clr-muted);
}

.empty-state svg   { margin: 0 auto 1rem; opacity: .3; }
.empty-state h3    { font-size: 1rem; color: var(--clr-text-2); margin-bottom: .35rem; }
.empty-state p     { font-size: .88rem; }

.table-footer {
  padding: .8rem 1.25rem;
  border-top: 1px solid var(--clr-border);
  font-size: .8rem;
  color: var(--clr-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
}

/* =====================================================
   SEARCH BAR
===================================================== */
.search-bar {
  position: relative;
  flex: 1;
  min-width: 180px;
  max-width: 320px;
}

.search-bar svg {
  position: absolute;
  left: .75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--clr-muted);
  pointer-events: none;
}

.search-bar input { padding-left: 2.3rem; font-size: .875rem; }

/* =====================================================
   BADGES
===================================================== */
.badge {
  display: inline-block;
  padding: .22rem .65rem;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .03em;
}

.badge-blue    { background: #e8f0fb; color: var(--clr-primary); }
.badge-gold    { background: #fdf3d8; color: #92650a; }
.badge-green   { background: var(--clr-success-bg); color: var(--clr-success); }
.badge-purple  { background: #f3e8ff; color: #6b21a8; }
.badge-gray    { background: #f1f5f9; color: #475569; }
.badge-red     { background: var(--clr-danger-bg); color: var(--clr-danger); }

/* =====================================================
   PROFILE CARD (student view)
===================================================== */
.profile-header {
  background: linear-gradient(135deg, var(--clr-primary) 0%, #0d2347 100%);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.profile-header::after {
  content: '';
  position: absolute;
  right: -40px; top: -40px;
  width: 200px; height: 200px;
  background: rgba(200,169,81,.1);
  border-radius: 50%;
}

.profile-avatar-lg {
  width: 80px; height: 80px;
  background: var(--clr-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  border: 3px solid rgba(255,255,255,.3);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.profile-info { position: relative; z-index: 1; }
.profile-info h2 { font-family: var(--font-display); color: #fff; font-size: 1.4rem; margin-bottom: .2rem; }
.profile-info p  { color: rgba(255,255,255,.65); font-size: .875rem; }

.profile-badge {
  margin-left: auto;
  background: rgba(200,169,81,.2);
  border: 1px solid rgba(200,169,81,.4);
  color: var(--clr-accent);
  font-size: .75rem;
  font-weight: 700;
  padding: .35rem .85rem;
  border-radius: 999px;
  letter-spacing: .04em;
  position: relative;
  z-index: 1;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.info-item {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.info-item-label {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--clr-muted);
  margin-bottom: .3rem;
}

.info-item-value { font-size: .92rem; font-weight: 600; color: var(--clr-text); }

/* =====================================================
   FORM GRID (registration)
===================================================== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.form-grid .full { grid-column: 1 / -1; }

.form-section-title {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--clr-muted);
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: .25rem;
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  border-top: 1px solid var(--clr-border);
  margin-top: .5rem;
}

/* =====================================================
   MODAL
===================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10,20,40,.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  transform: translateY(16px) scale(.98);
  transition: transform .22s ease;
  overflow: hidden;
}

.modal-overlay.open .modal { transform: translateY(0) scale(1); }

.modal-header {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 { font-size: .97rem; font-weight: 700; }
.modal-body      { padding: 1.4rem; }
.modal-footer    { padding: 1rem 1.4rem; border-top: 1px solid var(--clr-border); display: flex; justify-content: flex-end; gap: .6rem; }

/* =====================================================
   TOAST
===================================================== */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  z-index: 999;
}

.toast {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .8rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: .875rem;
  font-weight: 500;
  min-width: 260px;
  max-width: 360px;
  box-shadow: var(--shadow-lg);
  animation: toastIn .25s ease, toastOut .35s ease 2.8s forwards;
}

.toast.success { background: var(--clr-success); color: #fff; }
.toast.error   { background: var(--clr-danger);  color: #fff; }
.toast.warn    { background: var(--clr-warn);    color: #fff; }
.toast.info    { background: var(--clr-primary); color: #fff; }

@keyframes toastIn  { from { transform: translateX(110%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes toastOut { to   { transform: translateX(110%); opacity: 0; } }

/* =====================================================
   SPINNER
===================================================== */
.spinner-wrap { display: flex; align-items: center; justify-content: center; padding: 3rem; }
.spinner { width: 32px; height: 32px; border: 3px solid var(--clr-border); border-top-color: var(--clr-primary); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* =====================================================
   SIDEBAR OVERLAY (mobile)
===================================================== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 49;
}

/* =====================================================
   RESPONSIVE
===================================================== */
@media (max-width: 900px) {
  .auth-page { grid-template-columns: 1fr; }
  .auth-brand { display: none; }
  .auth-form-panel { min-height: 100vh; }

  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .main-area { margin-left: 0; }
  .hamburger-btn { display: flex; }
  .page-content { padding: 1.25rem; }
  .topbar { padding: 0 1.25rem; }
}

@media (max-width: 560px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .info-grid  { grid-template-columns: 1fr 1fr; }
  .form-grid  { grid-template-columns: 1fr; }
  .form-actions .btn { flex: 1; }
}