:root {
  --bg: #070b18;
  --surface: rgba(255, 255, 255, 0.09);
  --surface-2: rgba(255, 255, 255, 0.12);
  --ink: #f8fafc;
  --muted: #94a3b8;
  --line: rgba(255, 255, 255, 0.16);
  --accent: #38bdf8;
  --accent-dark: #6366f1;
  --accent-2: #a855f7;
  --soft: rgba(255, 255, 255, 0.08);
  --danger: #f43f5e;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  --shadow-strong: 0 34px 100px rgba(0, 0, 0, 0.38);
  --radius: 22px;
  --glow: 0 0 50px rgba(99, 102, 241, 0.32);
  color-scheme: dark;
}

body {
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: -28%;
  z-index: -4;
  pointer-events: none;
  background:
    radial-gradient(circle at 14% 16%, rgba(56, 189, 248, 0.25), transparent 27%),
    radial-gradient(circle at 84% 10%, rgba(168, 85, 247, 0.24), transparent 25%),
    radial-gradient(circle at 50% 86%, rgba(236, 72, 153, 0.16), transparent 28%),
    linear-gradient(135deg, #050816, #0f172a 55%, #111827);
  animation: premiumAurora 16s ease-in-out infinite alternate;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at center, #000, transparent 74%);
}

@keyframes premiumAurora {
  from { transform: translate3d(0, 0, 0) scale(1); filter: hue-rotate(0deg); }
  to { transform: translate3d(3%, -2%, 0) scale(1.08); filter: hue-rotate(18deg); }
}

button {
  border-radius: 16px;
  background: linear-gradient(135deg, #38bdf8, #6366f1, #a855f7);
  box-shadow: 0 18px 45px rgba(99, 102, 241, 0.30);
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 58px rgba(99, 102, 241, 0.42);
}

button.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.10);
}

button.warning {
  background: linear-gradient(135deg, #38bdf8, #2563eb, #6366f1);
}

button.danger {
  background: linear-gradient(135deg, #f43f5e, #b91c1c);
}

input,
select,
textarea {
  color: #f8fafc;
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

input:focus,
select:focus,
textarea:focus {
  border-color: rgba(56, 189, 248, 0.72);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.16);
  background: rgba(255, 255, 255, 0.12);
}

input::placeholder,
textarea::placeholder {
  color: #64748b;
}

select option {
  color: #111827;
  background: #fff;
}

label {
  color: #cbd5e1;
}

.login-screen,
.module-screen {
  background:
    radial-gradient(circle at 18% 18%, rgba(56, 189, 248, 0.18), transparent 32%),
    radial-gradient(circle at 84% 8%, rgba(168, 85, 247, 0.20), transparent 30%);
}

.login-card.auth-box,
.trial-modal,
.module-head,
.module-card,
.panel,
.topbar,
.stat-card,
.row-item,
.user-box {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(24px);
  box-shadow: var(--shadow);
}

.login-card.auth-box {
  width: min(100%, 440px);
  padding: 30px;
  border-radius: 34px;
  overflow: hidden;
}

.login-card.auth-box::before {
  height: auto;
  width: 220px;
  height: 220px;
  inset: -100px -84px auto auto;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.48), transparent 70%);
}

.login-card h1,
.module-head h1,
.topbar h2 {
  color: transparent;
  background: linear-gradient(135deg, #fff, #bfdbfe 35%, #c084fc 72%, #f9a8d4);
  -webkit-background-clip: text;
  background-clip: text;
}

.login-card p,
.module-head p,
.topbar p,
.module-card small {
  color: #cbd5e1;
}

.login-logo,
.app-logo,
.module-logo {
  filter: drop-shadow(0 0 22px rgba(56, 189, 248, 0.25));
}

.auth-input {
  padding: 14px 16px;
  border-radius: 17px;
}

.auth-btn {
  width: 100%;
  padding: 15px;
  border-radius: 17px;
  font-weight: 950;
}

.module-shell {
  width: min(1120px, 100%);
}

.module-head,
.module-card {
  border-radius: 28px;
}

.module-card {
  min-height: 220px;
  color: #f8fafc;
  background:
    radial-gradient(circle at 10% 0%, rgba(56, 189, 248, 0.18), transparent 34%),
    rgba(255, 255, 255, 0.08);
}

.module-card strong {
  color: #f8fafc;
  text-shadow: 0 0 18px rgba(56, 189, 248, 0.18);
}

.module-card small {
  color: #dbeafe;
}

.module-card:hover,
.panel:hover,
.stat-card:hover,
.row-item:hover {
  transform: translateY(-7px);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 34px 95px rgba(0, 0, 0, 0.38), var(--glow);
}

.module-icon {
  background: linear-gradient(135deg, #38bdf8, #6366f1, #a855f7);
  color: #ffffff;
  box-shadow: 0 0 34px rgba(56, 189, 248, 0.28);
}

.module-icon svg {
  stroke: #ffffff;
  filter: drop-shadow(0 3px 8px rgba(2, 6, 23, 0.32));
}

.app-shell,
.diploma-shell,
.account-shell {
  background: transparent;
  grid-template-columns: 292px minmax(0, 1fr);
}

.sidebar.dash-side,
.sidebar {
  background:
    radial-gradient(circle at 10% 0%, rgba(56, 189, 248, 0.20), transparent 34%),
    rgba(15, 23, 42, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: var(--shadow-strong);
  backdrop-filter: blur(28px);
}

.brand-title h1 {
  background: linear-gradient(135deg, #fff, #93c5fd, #c084fc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand p {
  color: #94a3b8;
}

.nav button,
.nav .dash-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: 17px;
  color: #cbd5e1;
  background: transparent;
  box-shadow: none;
  border: 1px solid transparent;
}

.nav-icon {
  width: 28px;
  height: 28px;
  display: inline-grid;
  place-items: center;
  flex: 0 0 28px;
  border-radius: 11px;
  color: #ffffff;
  font-size: 14px;
  font-weight: 950;
  line-height: 1;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.42), transparent 34%),
    linear-gradient(135deg, #38bdf8, #6366f1 58%, #a855f7);
  box-shadow:
    0 10px 24px rgba(56, 189, 248, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
  text-shadow: 0 2px 8px rgba(2, 6, 23, 0.42);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), filter 0.22s var(--ease);
}

.nav button.active,
.nav button:hover {
  color: white;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.22), rgba(168, 85, 247, 0.24));
  border-color: rgba(255, 255, 255, 0.14);
  transform: translateX(4px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.nav button.active .nav-icon,
.nav button:hover .nav-icon {
  transform: scale(1.08) rotate(-4deg);
  filter: saturate(1.15);
  box-shadow:
    0 0 24px rgba(56, 189, 248, 0.36),
    0 14px 32px rgba(168, 85, 247, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.user-box {
  color: #cbd5e1;
  border-radius: 20px;
}

.content {
  padding: 24px;
}

.topbar.dash-top,
.topbar {
  border-radius: 26px;
  padding: 18px;
  background: rgba(15, 23, 42, 0.48);
}

.panel {
  border-radius: 28px;
  background:
    radial-gradient(circle at 8% 0%, rgba(56, 189, 248, 0.12), transparent 32%),
    rgba(255, 255, 255, 0.08);
}

.panel::before {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.24), rgba(56, 189, 248, 0.20), rgba(168, 85, 247, 0.16));
}

.panel h3 {
  color: #f8fafc;
}

.panel h3::before {
  background: linear-gradient(180deg, #38bdf8, #a855f7);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.36);
}

.stats-grid {
  gap: 16px;
}

.stat-card.mini-kpi,
.stat-card {
  min-height: 116px;
  border-radius: 24px;
  background:
    radial-gradient(circle at 92% 0%, rgba(168, 85, 247, 0.22), transparent 42%),
    rgba(15, 23, 42, 0.50);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.10), var(--shadow);
}

.stat-card span {
  color: #94a3b8;
}

.stat-card strong {
  color: #ffffff;
  font-size: 34px;
}

.premium-insights {
  display: grid;
  grid-template-columns: minmax(360px, 1.3fr) minmax(260px, 0.7fr);
  gap: 16px;
  margin-top: 16px;
}

.chart-card,
.progress-card {
  min-height: 260px;
}

.chart-bars {
  height: 205px;
  display: flex;
  align-items: end;
  gap: 14px;
  padding: 18px;
  border-radius: 24px;
  background:
    linear-gradient(to top, rgba(56, 189, 248, 0.10), transparent),
    repeating-linear-gradient(to right, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 48px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.chart-bars i {
  flex: 1;
  min-height: 32px;
  border-radius: 14px 14px 6px 6px;
  background: linear-gradient(180deg, #7dd3fc, #6366f1 72%, #7c3aed);
  box-shadow: 0 14px 30px rgba(99, 102, 241, 0.26);
  transform-origin: bottom;
  animation: growBars 1.1s ease both;
}

@keyframes growBars {
  from { transform: scaleY(0.2); opacity: 0.45; }
  to { transform: scaleY(1); opacity: 1; }
}

.progress-list {
  display: grid;
  gap: 16px;
}

.progress-item strong {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: #e5e7eb;
  font-size: 12px;
  margin-bottom: 8px;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.10);
  overflow: hidden;
}

.progress-track i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #38bdf8, #a855f7);
}

.dashboard-grid {
  margin-top: 16px;
}

.row-item {
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.48);
  color: #e2e8f0;
}

.row-title strong {
  color: #f8fafc;
}

.meta {
  color: #94a3b8;
}

.pill,
.tag {
  color: #dbeafe;
  border: 1px solid rgba(56, 189, 248, 0.20);
  background: rgba(56, 189, 248, 0.12);
}

.data-table .row-item,
.list .row-item {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.empty {
  color: #94a3b8;
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
}

.preview-wrap,
.diploma-preview-wrap {
  background:
    radial-gradient(circle at 15% 0%, rgba(56, 189, 248, 0.14), transparent 34%),
    rgba(15, 23, 42, 0.50);
  border-color: rgba(255, 255, 255, 0.14);
}

.exam-paper {
  color: #111;
  background: #fff;
}

.answer-paper {
  color: #111;
}

.diploma-certificate {
  background-color: #fff;
  color: #111;
}

.modal-backdrop {
  background: rgba(2, 6, 23, 0.68);
}

.trial-modal {
  color: #f8fafc;
  background: rgba(15, 23, 42, 0.82);
}

.trial-modal h2 {
  color: #f8fafc;
}

.trial-countdown {
  color: #dbeafe;
  border-color: rgba(56, 189, 248, 0.20);
  background: rgba(56, 189, 248, 0.10);
}

.copyright-footer {
  color: #cbd5e1;
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(15, 23, 42, 0.62);
}

::selection {
  background: rgba(99, 102, 241, 0.38);
  color: #fff;
}

::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.72);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #38bdf8, #6366f1, #a855f7);
  border-color: rgba(15, 23, 42, 0.72);
}

@media (max-width: 1100px) {
  .premium-insights {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .app-shell,
  .diploma-shell,
  .account-shell {
    grid-template-columns: 1fr;
  }

  .sidebar.dash-side,
  .sidebar {
    border-radius: 0 0 28px 28px;
  }

  .content {
    padding: 16px;
  }
}

@media print {
  body,
  body::before,
  body::after {
    background: #fff !important;
    animation: none !important;
  }

  .exam-paper,
  .answer-paper,
  .diploma-certificate {
    color: #111 !important;
    background: #fff !important;
    box-shadow: none !important;
  }
}