/* ═══════════════════════════════════════════════════════════════
   YIVAI — Complete Design System v3
   Mobile-first. Touch-optimized. PWA-ready.
   Breakpoints: 480px (sm), 768px (md), 1024px (lg), 1280px (xl)
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

/* ── TOKENS ─────────────────────────────────────────────────── */
:root {
  /* Brand */
  --brand:       #7C5CFC;
  --brand-2:     #5B3FE4;
  --brand-glow:  rgba(124,92,252,.28);
  --brand-soft:  rgba(124,92,252,.12);
  --accent:      #00E5A0;
  --accent-soft: rgba(0,229,160,.12);
  --warn:        #FFB547;
  --warn-soft:   rgba(255,181,71,.12);
  --danger:      #FF5C7A;
  --danger-soft: rgba(255,92,122,.12);
  --info:        #38BDF8;
  --info-soft:   rgba(56,189,248,.12);

  /* Surfaces */
  --bg:      #080810;
  --bg-2:    #0E0E1A;
  --bg-3:    #141424;
  --surface: #181828;
  --surface-2: #1E1E32;
  --surface-3: #242438;

  /* Borders */
  --line:   rgba(255,255,255,.07);
  --line-2: rgba(255,255,255,.12);

  /* Text */
  --tx:   #F0F0FA;
  --tx-2: #A0A0C0;
  --tx-3: #606080;

  /* Gradients */
  --g-brand:  linear-gradient(135deg,#7C5CFC,#A78BFA);
  --g-accent: linear-gradient(135deg,#00E5A0,#38BDF8);
  --g-warm:   linear-gradient(135deg,#FF5C7A,#FFB547);
  --g-mesh:   radial-gradient(at 20% 50%,rgba(124,92,252,.15) 0px,transparent 50%),
              radial-gradient(at 80% 20%,rgba(0,229,160,.10) 0px,transparent 50%),
              radial-gradient(at 60% 80%,rgba(255,92,122,.08) 0px,transparent 50%);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,.4);
  --shadow:    0 8px 32px rgba(0,0,0,.5);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.6);
  --glow-brand: 0 0 40px rgba(124,92,252,.3);
  --glow-accent: 0 0 30px rgba(0,229,160,.25);

  /* Radius */
  --r-sm:  6px;
  --r:     12px;
  --r-lg:  18px;
  --r-xl:  24px;
  --r-pill: 100px;

  /* Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap:    16px;
  --gap-lg: 24px;
  --gap-xl: 40px;

  /* Layout */
  --sidebar-w:   256px;
  --topbar-h:    56px;
  --bnav-h:      62px;
  --page-pad:    20px;
  --page-pad-sm: 14px;

  /* Transitions */
  --ease: cubic-bezier(.4,0,.2,1);
  --spring: cubic-bezier(.34,1.56,.64,1);
}

/* ── BASE ────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}
body{
  font-family:'Sora',sans-serif;
  background:var(--bg);
  color:var(--tx);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  min-height:100vh;
}
::-webkit-scrollbar{width:4px;height:4px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--brand);border-radius:2px}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{color:var(--tx)}
button,input,select,textarea{font-family:inherit;font-size:inherit}

/* ── TYPOGRAPHY ─────────────────────────────────────────────── */
h1{font-size:clamp(1.75rem,5vw,2.75rem);font-weight:800;line-height:1.15;letter-spacing:-.02em}
h2{font-size:clamp(1.4rem,4vw,2rem);font-weight:700;line-height:1.2;letter-spacing:-.01em}
h3{font-size:clamp(1.1rem,2.5vw,1.35rem);font-weight:700;line-height:1.3}
h4{font-size:1rem;font-weight:600;line-height:1.4}
h5{font-size:.875rem;font-weight:600}
p{color:var(--tx-2);font-size:.9375rem;line-height:1.7}
.mono{font-family:'JetBrains Mono',monospace}
.gradient-text{background:var(--g-brand);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.gradient-text-accent{background:var(--g-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.text-muted{color:var(--tx-2)}
.text-dim{color:var(--tx-3)}
.text-brand{color:var(--brand)}
.text-accent{color:var(--accent)}
.text-warn{color:var(--warn)}
.text-danger{color:var(--danger)}
.text-success{color:var(--accent)}
.fw-medium{font-weight:500}
.fw-semi{font-weight:600}
.fw-bold{font-weight:700}
.fw-black{font-weight:800}
.text-sm{font-size:.8125rem}
.text-xs{font-size:.75rem}
.text-center{text-align:center}
.text-right{text-align:right}
.truncate{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ── LAYOUT SHELL ────────────────────────────────────────────── */
.shell{display:flex;min-height:100vh}

/* ── SIDEBAR ────────────────────────────────────────────────── */
.sidebar{
  width:var(--sidebar-w);
  height:100vh;
  position:fixed;
  top:0;left:0;
  background:var(--bg-2);
  border-right:1px solid var(--line);
  display:flex;
  flex-direction:column;
  z-index:300;
  transition:transform .3s var(--ease);
  overflow:hidden;
}
.sidebar-inner{display:flex;flex-direction:column;height:100%;overflow-y:auto;overflow-x:hidden}
.sidebar-inner::-webkit-scrollbar{width:0}

/* Mobile: hidden by default */
@media(max-width:1023px){
  .sidebar{transform:translateX(-100%);box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:translateX(0)}
}
@media(min-width:1024px){
  .main-wrap{margin-left:var(--sidebar-w)}
}

.sidebar-overlay{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,.65);
  z-index:299;
  backdrop-filter:blur(3px);
  -webkit-backdrop-filter:blur(3px);
}
.sidebar-overlay.show{display:block}

/* Sidebar brand */
.sidebar-brand{
  padding:18px 16px 14px;
  border-bottom:1px solid var(--line);
  flex-shrink:0;
  display:flex;align-items:center;gap:10px;
}
.sidebar-logo-text{
  font-family:'JetBrains Mono',monospace;
  font-size:20px;font-weight:600;
  letter-spacing:2px;
  background:var(--g-brand);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  flex:1;
}
.sidebar-close{
  width:30px;height:30px;
  border-radius:var(--r-sm);
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--tx-2);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  font-size:13px;
  transition:.2s;
  flex-shrink:0;
}
.sidebar-close:hover{color:var(--danger);border-color:var(--danger-soft)}
@media(min-width:1024px){.sidebar-close{display:none}}

/* Role badge */
.role-badge{
  margin:12px 16px 0;
  padding:5px 10px;
  border-radius:var(--r-sm);
  font-size:10px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;
  display:inline-flex;align-items:center;gap:5px;
  flex-shrink:0;
}
.role-badge.admin  {background:var(--danger-soft);color:var(--danger);border:1px solid rgba(255,92,122,.2)}
.role-badge.tutor  {background:var(--warn-soft);color:var(--warn);border:1px solid rgba(255,181,71,.2)}
.role-badge.student{background:var(--brand-soft);color:var(--brand);border:1px solid rgba(124,92,252,.2)}

/* Nav section */
.nav-section{padding:16px 10px 0}
.nav-section-label{
  font-size:9.5px;font-weight:700;letter-spacing:1.8px;text-transform:uppercase;
  color:var(--tx-3);padding:0 8px 6px;
}
.nav-item{
  display:flex;align-items:center;gap:10px;
  padding:9px 10px;
  border-radius:var(--r-sm);
  color:var(--tx-2);
  font-size:13px;font-weight:500;
  text-decoration:none;
  transition:all .18s var(--ease);
  margin-bottom:1px;
  position:relative;
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
}
.nav-item:hover{background:var(--surface);color:var(--tx)}
.nav-item.active{
  background:var(--brand-soft);
  color:var(--brand);
  font-weight:600;
}
.nav-item.active::before{
  content:'';
  position:absolute;left:0;top:25%;bottom:25%;
  width:2.5px;border-radius:0 2px 2px 0;
  background:var(--brand);
}
.nav-item.admin-active{background:var(--danger-soft);color:var(--danger)}
.nav-item.admin-active::before{background:var(--danger)}
.nav-item.tutor-active{background:var(--warn-soft);color:var(--warn)}
.nav-item.tutor-active::before{background:var(--warn)}
.nav-icon{width:16px;text-align:center;font-size:13px;flex-shrink:0;opacity:.9}
.nav-label{flex:1;line-height:1}
.nav-chip{
  font-size:9px;font-weight:700;
  background:var(--danger);color:#fff;
  padding:2px 6px;border-radius:100px;
  line-height:1.4;flex-shrink:0;
}
.nav-gap{height:1px;background:var(--line);margin:8px 10px}

/* Sidebar user */
.sidebar-user{
  margin:auto 0 0;
  padding:12px;
  border-top:1px solid var(--line);
  flex-shrink:0;
}
.sidebar-user-inner{
  display:flex;align-items:center;gap:9px;
  padding:9px 10px;
  border-radius:var(--r-sm);
  background:var(--surface);
  border:1px solid var(--line);
  text-decoration:none;
  transition:.2s;
  -webkit-tap-highlight-color:transparent;
}
.sidebar-user-inner:hover{border-color:var(--line-2);background:var(--surface-2)}
.user-av{
  width:32px;height:32px;
  border-radius:var(--r-sm);
  object-fit:cover;flex-shrink:0;
  background:var(--surface-3);
}
.user-name{font-size:12px;font-weight:600;color:var(--tx);line-height:1.2}
.user-email{font-size:10px;color:var(--tx-3);line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:130px}

/* ── MAIN WRAP ───────────────────────────────────────────────── */
.main-wrap{flex:1;min-width:0;display:flex;flex-direction:column}

/* ── TOP BAR ─────────────────────────────────────────────────── */
.topbar{
  position:sticky;top:0;z-index:200;
  height:var(--topbar-h);
  background:rgba(8,8,16,.88);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--line);
  padding:0 var(--page-pad);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.topbar-left{display:flex;align-items:center;gap:10px;min-width:0}
.topbar-right{display:flex;align-items:center;gap:6px;flex-shrink:0}
.topbar-title{
  font-size:15px;font-weight:700;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.menu-btn{
  width:36px;height:36px;
  border-radius:var(--r-sm);
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--tx-2);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  font-size:15px;
  transition:.2s;flex-shrink:0;
  -webkit-tap-highlight-color:transparent;
}
.menu-btn:hover{border-color:var(--brand);color:var(--brand)}
@media(min-width:1024px){.menu-btn{display:none}}
.icon-btn{
  width:34px;height:34px;
  border-radius:var(--r-sm);
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--tx-2);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  font-size:13px;
  transition:.2s;
  text-decoration:none;
  position:relative;
  -webkit-tap-highlight-color:transparent;
}
.icon-btn:hover{border-color:var(--brand);color:var(--brand)}
.notif-dot{
  position:absolute;top:6px;right:6px;
  width:6px;height:6px;
  background:var(--danger);border-radius:50%;
  border:1.5px solid var(--bg);
}
.topbar-av{
  width:32px;height:32px;
  border-radius:var(--r-sm);
  object-fit:cover;
  border:2px solid var(--brand);
  cursor:pointer;
  transition:.2s;
  display:block;
}
.topbar-av:hover{border-color:var(--accent)}

/* ── PAGE BODY ───────────────────────────────────────────────── */
.page-body{
  flex:1;
  padding:var(--page-pad);
  /* space for bottom nav on mobile */
  padding-bottom:calc(var(--bnav-h) + var(--page-pad) + 4px);
}
@media(min-width:768px){
  .page-body{padding-bottom:var(--page-pad)}
}
@media(max-width:479px){
  .page-body{padding:var(--page-pad-sm);padding-bottom:calc(var(--bnav-h)+var(--page-pad-sm)+4px)}
}
@supports(padding-bottom:env(safe-area-inset-bottom)){
  .page-body{
    padding-bottom:calc(var(--bnav-h)+var(--page-pad)+env(safe-area-inset-bottom));
  }
  @media(min-width:768px){.page-body{padding-bottom:var(--page-pad)}}
}

/* ── BOTTOM NAV — mobile only, fixed (does not scroll) ────────── */
.bottom-nav{
  position:fixed;bottom:0;left:0;right:0;
  height:var(--bnav-h);
  background:rgba(8,8,16,.96);
  border-top:1px solid var(--line);
  backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);
  display:flex;align-items:stretch;justify-content:space-around;
  z-index:200;
  padding-bottom:env(safe-area-inset-bottom,0px);
}
/* Hide on desktop/tablet — sidebar handles navigation there */
@media(min-width:768px){
  .bottom-nav{display:none}
}
.bnav-btn{
  flex:1;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  color:var(--tx-3);
  text-decoration:none;
  font-size:9.5px;font-weight:600;
  transition:.2s;
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
  position:relative;
}
.bnav-btn i{font-size:19px;transition:.2s}
.bnav-btn.active{color:var(--brand)}
.bnav-btn.active i{filter:drop-shadow(0 0 8px var(--brand))}
.bnav-btn.active-admin{color:var(--danger)}
.bnav-btn.active-admin i{filter:drop-shadow(0 0 8px var(--danger))}
.bnav-btn.active-tutor{color:var(--warn)}
.bnav-btn.active-tutor i{filter:drop-shadow(0 0 8px var(--warn))}
.bnav-badge{
  position:absolute;top:4px;right:calc(50% - 18px);
  background:var(--danger);color:#fff;
  font-size:8px;font-weight:800;
  padding:1px 4px;border-radius:100px;
  line-height:1.4;
}

/* ── BUTTONS ─────────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:10px 20px;
  border-radius:var(--r-sm);
  font-size:13.5px;font-weight:600;
  cursor:pointer;
  border:none;
  text-decoration:none;
  white-space:nowrap;
  transition:all .2s var(--ease);
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
  letter-spacing:.15px;
  line-height:1;
}
.btn:active{transform:scale(.97)}
.btn:disabled{opacity:.45;pointer-events:none}
/* Primary */
.btn-primary{
  background:var(--g-brand);color:#fff;
  box-shadow:0 4px 20px var(--brand-glow);
}
.btn-primary:hover{
  box-shadow:0 6px 28px var(--brand-glow);
  transform:translateY(-1px);color:#fff;
}
/* Accent */
.btn-accent{background:var(--g-accent);color:#040a12}
.btn-accent:hover{transform:translateY(-1px)}
/* Danger */
.btn-danger{background:var(--danger-soft);color:var(--danger);border:1px solid rgba(255,92,122,.25)}
.btn-danger:hover{background:rgba(255,92,122,.2)}
/* Warning */
.btn-warn{background:var(--warn-soft);color:var(--warn);border:1px solid rgba(255,181,71,.25)}
.btn-warn:hover{background:rgba(255,181,71,.2)}
/* Ghost */
.btn-ghost{background:transparent;border:1px solid var(--line-2);color:var(--tx-2)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
/* Surface */
.btn-surface{background:var(--surface);border:1px solid var(--line);color:var(--tx-2)}
.btn-surface:hover{border-color:var(--line-2);color:var(--tx)}
/* Sizes */
.btn-xs{padding:5px 10px;font-size:11px;border-radius:var(--r-sm);gap:5px}
.btn-sm{padding:7px 14px;font-size:12px;border-radius:var(--r-sm)}
.btn-lg{padding:13px 28px;font-size:15px;border-radius:var(--r)}
.btn-xl{padding:16px 36px;font-size:16px;border-radius:var(--r)}
.btn-block{width:100%}
.btn-icon{width:36px;height:36px;padding:0;border-radius:var(--r-sm)}

/* ── CARDS ───────────────────────────────────────────────────── */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
}
.card-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 18px;
  border-bottom:1px solid var(--line);
}
.card-head h3,.card-head .card-title{font-size:13.5px;font-weight:700;margin:0}
.card-body{padding:18px}
.card-foot{
  padding:12px 18px;
  border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
}
.card-link{font-size:12px;color:var(--brand);font-weight:600}
.card-link:hover{text-decoration:underline}
/* Elevated card (hover lift) */
.card-lift{transition:transform .22s var(--ease),border-color .22s;-webkit-tap-highlight-color:transparent}
.card-lift:hover{transform:translateY(-2px);border-color:var(--line-2)}
.card-lift:active{transform:scale(.99)}
/* Glow card */
.card-glow:hover{box-shadow:var(--glow-brand)}

/* ── STAT CARDS ──────────────────────────────────────────────── */
.stats-row{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:10px;
  margin-bottom:var(--gap-lg);
}
@media(min-width:640px){.stats-row{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.stats-row{grid-template-columns:repeat(4,1fr);gap:14px}}
@media(min-width:1280px){.stats-row{grid-template-columns:repeat(6,1fr)}}
.stat-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:14px;
  display:flex;flex-direction:column;gap:8px;
  cursor:pointer;
  transition:all .2s var(--ease);
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
}
@media(min-width:640px){.stat-card{padding:18px}}
.stat-card:hover{transform:translateY(-2px);border-color:var(--line-2)}
.stat-card:active{transform:scale(.98)}
.stat-icon-wrap{
  width:38px;height:38px;
  border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;
  font-size:16px;flex-shrink:0;
}
@media(min-width:640px){.stat-icon-wrap{width:44px;height:44px;font-size:18px}}
.si-brand {background:var(--brand-soft);color:var(--brand)}
.si-accent{background:var(--accent-soft);color:var(--accent)}
.si-warn  {background:var(--warn-soft);color:var(--warn)}
.si-danger{background:var(--danger-soft);color:var(--danger)}
.si-info  {background:var(--info-soft);color:var(--info)}
.stat-value{font-size:22px;font-weight:800;line-height:1;color:var(--tx)}
@media(min-width:640px){.stat-value{font-size:26px}}
.stat-label{font-size:11px;color:var(--tx-2);font-weight:500}
.stat-delta{font-size:11px;display:flex;align-items:center;gap:3px}
.delta-up{color:var(--accent)}.delta-dn{color:var(--danger)}

/* ── BADGES ──────────────────────────────────────────────────── */
.badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 8px;border-radius:var(--r-pill);
  font-size:9.5px;font-weight:700;letter-spacing:.4px;text-transform:uppercase;
}
.badge-brand  {background:var(--brand-soft);color:var(--brand);border:1px solid rgba(124,92,252,.2)}
.badge-accent {background:var(--accent-soft);color:var(--accent);border:1px solid rgba(0,229,160,.2)}
.badge-warn   {background:var(--warn-soft);color:var(--warn);border:1px solid rgba(255,181,71,.2)}
.badge-danger {background:var(--danger-soft);color:var(--danger);border:1px solid rgba(255,92,122,.2)}
.badge-muted  {background:rgba(96,96,128,.12);color:var(--tx-3);border:1px solid rgba(96,96,128,.2)}
.badge-admin  {background:var(--danger-soft);color:var(--danger);border:1px solid rgba(255,92,122,.2)}
.badge-tutor  {background:var(--warn-soft);color:var(--warn);border:1px solid rgba(255,181,71,.2)}
.badge-student{background:var(--brand-soft);color:var(--brand);border:1px solid rgba(124,92,252,.2)}

/* ── ALERTS ──────────────────────────────────────────────────── */
.alert{
  padding:12px 14px;
  border-radius:var(--r-sm);
  font-size:13px;
  display:flex;align-items:flex-start;gap:8px;
  margin-bottom:14px;
  line-height:1.5;
}
.alert-success{background:var(--accent-soft);border:1px solid rgba(0,229,160,.3);color:var(--accent)}
.alert-error  {background:var(--danger-soft);border:1px solid rgba(255,92,122,.3);color:var(--danger)}
.alert-warn   {background:var(--warn-soft);border:1px solid rgba(255,181,71,.3);color:var(--warn)}
.alert-info   {background:var(--brand-soft);border:1px solid rgba(124,92,252,.3);color:var(--brand)}

/* ── FORMS ───────────────────────────────────────────────────── */
.form-group{margin-bottom:16px}
.form-label{display:block;font-size:12.5px;font-weight:600;margin-bottom:6px;color:var(--tx)}
.form-req{color:var(--danger)}
.form-hint{font-size:11px;color:var(--tx-3);margin-top:5px}
.form-err {font-size:11px;color:var(--danger);margin-top:5px;display:flex;align-items:center;gap:4px}
.input-wrap{position:relative}
.input-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--tx-3);font-size:13px;pointer-events:none;z-index:1}
.field{
  width:100%;
  padding:11px 14px;
  border-radius:var(--r-sm);
  background:var(--bg-3);
  border:1px solid var(--line-2);
  color:var(--tx);
  font-family:inherit;font-size:14px;
  transition:border-color .2s,box-shadow .2s;
  outline:none;
  -webkit-appearance:none;
}
.field:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.field::placeholder{color:var(--tx-3)}
.field.has-icon{padding-left:38px}
.field.has-btn{padding-right:44px}
textarea.field{min-height:100px;resize:vertical}
select.field{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='6' viewBox='0 0 12 6'%3E%3Cpath fill='%23606080' d='M6 6L0 0h12z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:34px}
.field-btn{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--tx-3);cursor:pointer;padding:6px;font-size:14px;border-radius:var(--r-sm);transition:.2s;-webkit-tap-highlight-color:transparent}
.field-btn:hover{color:var(--tx)}
.form-row{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:520px){.form-row{grid-template-columns:1fr 1fr}}

/* ── TABLES ──────────────────────────────────────────────────── */
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--r);border:1px solid var(--line)}
.tbl{width:100%;border-collapse:collapse;font-size:12.5px;min-width:560px}
.tbl thead th{
  padding:10px 14px;text-align:left;
  font-size:10px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;
  color:var(--tx-3);border-bottom:1px solid var(--line);
  background:var(--bg-3);white-space:nowrap;
}
.tbl td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:middle;color:var(--tx-2)}
.tbl tbody tr:last-child td{border-bottom:none}
.tbl tbody tr:hover{background:rgba(255,255,255,.02)}

/* ── LIST ITEMS ──────────────────────────────────────────────── */
.list-item{
  display:flex;align-items:center;gap:12px;
  padding:12px 16px;
  border-bottom:1px solid var(--line);
  transition:background .15s;
}
.list-item:last-child{border-bottom:none}
.list-item:active{background:rgba(255,255,255,.02)}
.li-av{width:36px;height:36px;border-radius:var(--r-sm);object-fit:cover;flex-shrink:0;background:var(--surface-3)}
.li-body{flex:1;min-width:0}
.li-title{font-size:13px;font-weight:600;color:var(--tx);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.li-sub  {font-size:11px;color:var(--tx-3);margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.li-right{flex-shrink:0;text-align:right}
.li-meta {font-size:11px;color:var(--tx-3)}

/* ── PROGRESS ────────────────────────────────────────────────── */
.prog{height:4px;background:var(--surface-3);border-radius:2px;overflow:hidden}
.prog-fill{height:100%;border-radius:2px;background:var(--g-brand);transition:width 1s var(--ease)}
.prog-fill.accent{background:var(--g-accent)}
.prog-fill.warn{background:var(--warn)}
.prog-fill.danger{background:var(--danger)}

/* ── COURSE CARD ─────────────────────────────────────────────── */
.course-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
  overflow:hidden;
  display:flex;flex-direction:column;
  text-decoration:none;color:var(--tx);
  transition:all .22s var(--ease);
  -webkit-tap-highlight-color:transparent;
}
.course-card:hover{transform:translateY(-2px);border-color:rgba(124,92,252,.3);box-shadow:var(--glow-brand)}
.course-card:active{transform:scale(.99)}
.course-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--bg-3)}
.course-thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s}
.course-card:hover .course-thumb img{transform:scale(1.04)}
.course-info{padding:12px;flex:1;display:flex;flex-direction:column;gap:5px}
.course-title{font-size:13px;font-weight:700;line-height:1.35;color:var(--tx)}
.course-meta-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:2px}
.course-foot{
  display:flex;align-items:center;justify-content:space-between;
  padding:9px 12px;
  border-top:1px solid var(--line);
}
.price{font-size:15px;font-weight:800;color:var(--accent)}
.price.free{color:var(--brand)}
.price.strike{text-decoration:line-through;color:var(--tx-3);font-size:11px;font-weight:400}

/* ── AVATAR ──────────────────────────────────────────────────── */
.av{border-radius:var(--r-sm);object-fit:cover;display:block;background:var(--surface-3)}
.av-xs{width:24px;height:24px}
.av-sm{width:32px;height:32px}
.av-md{width:44px;height:44px}
.av-lg{width:64px;height:64px;border-radius:var(--r)}
.av-xl{width:88px;height:88px;border-radius:var(--r-lg)}
.av-round{border-radius:50%!important}

/* ── PAGE HEADER ─────────────────────────────────────────────── */
.page-header{
  border-radius:var(--r-lg);
  padding:20px;
  margin-bottom:var(--gap-lg);
  position:relative;overflow:hidden;
  background:var(--surface);
  border:1px solid var(--line);
}
.page-header::after{
  content:'';position:absolute;
  right:-40px;top:-40px;
  width:180px;height:180px;
  border-radius:50%;pointer-events:none;
  opacity:.7;
}
.ph-admin::after{background:radial-gradient(circle,rgba(255,92,122,.18),transparent)}
.ph-tutor::after{background:radial-gradient(circle,rgba(255,181,71,.18),transparent)}
.ph-student::after{background:radial-gradient(circle,rgba(124,92,252,.2),transparent)}
.ph-title{font-size:clamp(15px,3vw,20px);font-weight:800;margin-bottom:3px}
.ph-sub{font-size:13px;color:var(--tx-2)}
.ph-actions{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}

/* ── TOGGLE ──────────────────────────────────────────────────── */
.toggle-row{display:flex;align-items:center;justify-content:space-between;gap:16px}
.toggle-text .toggle-title{font-size:13.5px;font-weight:600}
.toggle-text .toggle-hint{font-size:11px;color:var(--tx-3);margin-top:2px}
.switch{position:relative;width:42px;height:24px;flex-shrink:0}
.switch input{opacity:0;width:0;height:0}
.sw-track{
  position:absolute;inset:0;
  background:var(--surface-3);border:1px solid var(--line-2);
  border-radius:24px;cursor:pointer;transition:.3s var(--ease);
}
.sw-track::before{
  content:'';position:absolute;
  width:18px;height:18px;
  background:var(--tx-3);border-radius:50%;
  left:2px;top:2px;
  transition:.3s var(--spring);
}
.switch input:checked+.sw-track{background:var(--brand);border-color:var(--brand)}
.switch input:checked+.sw-track::before{transform:translateX(18px);background:#fff}

/* ── FILTER / SEARCH BAR ─────────────────────────────────────── */
.filter-bar{
  display:flex;gap:8px;align-items:center;flex-wrap:wrap;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:10px 14px;
  margin-bottom:14px;
}
.search-wrap{position:relative;flex:1;min-width:160px}
.search-wrap i{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--tx-3);font-size:12px;pointer-events:none}
.search-field{
  width:100%;padding:8px 10px 8px 32px;
  border-radius:var(--r-sm);
  background:var(--bg-3);
  border:1px solid var(--line);
  color:var(--tx);font-family:inherit;font-size:13px;
  outline:none;transition:.2s;
}
.search-field:focus{border-color:var(--brand)}
.filter-sel{
  padding:8px 12px;
  border-radius:var(--r-sm);
  background:var(--bg-3);
  border:1px solid var(--line);
  color:var(--tx);font-family:inherit;font-size:12.5px;
  outline:none;cursor:pointer;appearance:none;
  min-width:110px;
}

/* ── PAGINATION ──────────────────────────────────────────────── */
.pagination{display:flex;gap:5px;justify-content:center;flex-wrap:wrap;padding:16px 0 4px}
.pager{
  min-width:34px;height:34px;
  border-radius:var(--r-sm);
  background:var(--surface);border:1px solid var(--line);
  color:var(--tx-2);font-family:inherit;font-size:13px;font-weight:600;
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:.18s;text-decoration:none;padding:0 10px;
  -webkit-tap-highlight-color:transparent;
}
.pager:hover,.pager.on{background:var(--brand);border-color:var(--brand);color:#fff}

/* ── MODALS ──────────────────────────────────────────────────── */
.modal-backdrop{
  position:fixed;inset:0;
  background:rgba(0,0,0,.7);
  backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);
  z-index:500;
  display:flex;align-items:flex-end;padding:0;
  opacity:0;pointer-events:none;transition:opacity .3s;
}
@media(min-width:600px){.modal-backdrop{align-items:center;padding:20px}}
.modal-backdrop.open{opacity:1;pointer-events:all}
.modal-box{
  background:var(--surface);border:1px solid var(--line-2);
  width:100%;max-height:90vh;overflow-y:auto;
  border-radius:var(--r-xl) var(--r-xl) 0 0;
  transform:translateY(32px);
  transition:transform .35s var(--spring);
}
@media(min-width:600px){.modal-box{max-width:500px;margin:0 auto;border-radius:var(--r-xl);transform:scale(.94)}}
.modal-backdrop.open .modal-box{transform:translateY(0) scale(1)}
.modal-drag{width:36px;height:4px;background:var(--line-2);border-radius:2px;margin:12px auto 0}
@media(min-width:600px){.modal-drag{display:none}}
.modal-head{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.modal-head h3{font-size:16px;font-weight:700}
.modal-close{width:28px;height:28px;border-radius:var(--r-sm);background:var(--surface-2);border:1px solid var(--line);color:var(--tx-3);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:12px;transition:.2s}
.modal-close:hover{color:var(--danger);border-color:var(--danger-soft)}
.modal-body{padding:20px}
.modal-foot{padding:14px 20px;border-top:1px solid var(--line);display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}

/* ── EMPTY STATE ─────────────────────────────────────────────── */
.empty{text-align:center;padding:40px 20px;color:var(--tx-3)}
.empty-icon{font-size:40px;margin-bottom:12px;opacity:.4;display:block}
.empty-title{font-size:15px;font-weight:700;color:var(--tx-2);margin-bottom:5px}
.empty-sub{font-size:13px;color:var(--tx-3);margin-bottom:16px}

/* ── GRIDS ───────────────────────────────────────────────────── */
.grid-2{display:grid;grid-template-columns:1fr;gap:14px}
.grid-3{display:grid;grid-template-columns:1fr;gap:12px}
.grid-courses{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:480px){.grid-courses{grid-template-columns:1fr 1fr}}
@media(min-width:768px){.grid-2{grid-template-columns:1fr 1fr};.grid-courses{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.grid-2{grid-template-columns:1fr 300px};.grid-3{grid-template-columns:repeat(3,1fr)};.grid-courses{grid-template-columns:repeat(4,1fr)}}
.col-stack{display:flex;flex-direction:column;gap:14px}

/* ── DIVIDER ─────────────────────────────────────────────────── */
.divider{height:1px;background:var(--line);margin:16px 0}
.divider-text{display:flex;align-items:center;gap:12px;color:var(--tx-3);font-size:12px;margin:16px 0}
.divider-text::before,.divider-text::after{content:'';flex:1;height:1px;background:var(--line)}

/* ── UTILITIES ───────────────────────────────────────────────── */
.d-flex{display:flex}.d-grid{display:grid}
.ai-center{align-items:center}.jc-between{justify-content:space-between}
.flex-1{flex:1}.flex-wrap{flex-wrap:wrap}
.gap-4{gap:4px}.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}
.mt-4{margin-top:4px}.mt-8{margin-top:8px}.mt-12{margin-top:12px}
.mt-16{margin-top:16px}.mt-20{margin-top:20px}.mt-24{margin-top:24px}
.mb-8{margin-bottom:8px}.mb-12{margin-bottom:12px}.mb-16{margin-bottom:16px}
.mb-20{margin-bottom:20px}.mb-24{margin-bottom:24px}
.w-full{width:100%}.hidden{display:none!important}
.rel{position:relative}.abs{position:absolute}

/* ── ANIMATIONS ──────────────────────────────────────────────── */
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.55}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes shimmer{0%{background-position:-300px 0}100%{background-position:300px 0}}
.anim-1{animation:fadeUp .4s var(--ease) both}
.anim-2{animation:fadeUp .4s .06s var(--ease) both}
.anim-3{animation:fadeUp .4s .12s var(--ease) both}
.anim-4{animation:fadeUp .4s .18s var(--ease) both}
.anim-5{animation:fadeUp .4s .24s var(--ease) both}
.anim-6{animation:fadeUp .4s .30s var(--ease) both}
.fa-spin{animation:spin .8s linear infinite}
.skeleton{
  background:linear-gradient(90deg,var(--surface) 25%,var(--surface-2) 50%,var(--surface) 75%);
  background-size:600px 100%;
  animation:shimmer 1.6s infinite;
  border-radius:var(--r-sm);
}

/* ── SWAL THEME ──────────────────────────────────────────────── */
.swal2-popup{font-family:'Sora',sans-serif!important;border-radius:var(--r-xl)!important;background:var(--surface-2)!important;color:var(--tx)!important;border:1px solid var(--line-2)!important}
.swal2-title{color:var(--tx)!important}
.swal2-html-container{color:var(--tx-2)!important}
.swal2-confirm{border-radius:var(--r-sm)!important;font-family:'Sora',sans-serif!important}
.swal2-cancel{border-radius:var(--r-sm)!important;font-family:'Sora',sans-serif!important;background:var(--surface-3)!important;color:var(--tx-2)!important}

/* ── RESPONSIVE HELPERS ──────────────────────────────────────── */
@media(max-width:479px){
  .hide-xs{display:none!important}
  .topbar-title{font-size:14px}
}
@media(min-width:480px){.show-xs-only{display:none!important}}
@media(min-width:768px){.hide-md{display:none!important}.show-mobile-only{display:none!important}}

/* ═══════════════════════════════════════════════════════════════
   LIGHT MODE — [data-theme="light"] on <html>
   ═══════════════════════════════════════════════════════════════ */
[data-theme="light"] {
  --bg:      #F4F4FA;
  --bg-2:    #ECEDF5;
  --bg-3:    #E4E5F0;
  --surface: #FFFFFF;
  --surface-2: #F8F8FF;
  --surface-3: #F0F0F8;

  --line:   rgba(0,0,0,.08);
  --line-2: rgba(0,0,0,.13);

  --tx:   #0F0F1A;
  --tx-2: #3A3A5C;
  --tx-3: #8080A0;

  --shadow-sm: 0 2px 8px rgba(0,0,0,.08);
  --shadow:    0 8px 32px rgba(0,0,0,.10);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.12);
  --glow-brand: 0 0 40px rgba(124,92,252,.15);

  --g-mesh: radial-gradient(at 20% 50%,rgba(124,92,252,.07) 0px,transparent 50%),
            radial-gradient(at 80% 20%,rgba(0,229,160,.05) 0px,transparent 50%),
            radial-gradient(at 60% 80%,rgba(255,92,122,.04) 0px,transparent 50%);
}
[data-theme="light"] ::-webkit-scrollbar-track { background: rgba(0,0,0,.05); }
[data-theme="light"] .sidebar { box-shadow: 2px 0 20px rgba(0,0,0,.08); }
[data-theme="light"] .topbar  { box-shadow: 0 2px 12px rgba(0,0,0,.06); }

/* ── THEME TOGGLE BUTTON ──────────────────────────────────────── */
.theme-toggle {
  width: 36px; height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--tx-2);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  transition: all .2s;
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }