:root {
  --bg: #0a0f1a;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-input: rgba(30, 41, 59, 0.8);
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --text: #f1f5f9;
  --text-2: #94a3b8;
  --text-3: #64748b;
  --blue: #3b82f6;
  --blue-glow: rgba(59, 130, 246, 0.15);
  --green: #22c55e;
  --red: #ef4444;
  --amber: #f59e0b;
  --r: 12px;
  --r-sm: 8px;
}

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

body {
  font-family:
    "Inter",
    "Noto Sans SC",
    -apple-system,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(
      ellipse at 20% 0%,
      rgba(59, 130, 246, 0.07),
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 100%,
      rgba(34, 197, 94, 0.04),
      transparent 50%
    );
  pointer-events: none;
  z-index: 0;
}

/* === Navbar === */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 52px;
  background: rgba(10, 15, 26, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  letter-spacing: -0.02em;
}
.nav-tabs {
  display: flex;
  gap: 0.2rem;
}
.nav-tab {
  padding: 0.35rem 0.75rem;
  border-radius: var(--r-sm);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
}
.nav-tab:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}
.nav-tab.active {
  color: var(--blue);
  background: var(--blue-glow);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.nav-user {
  font-size: 0.82rem;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* === Layout === */
.container {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* === Card === */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.5rem;
  transition:
    border-color 0.15s,
    transform 0.15s;
}
.card-click:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  cursor: pointer;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--r-sm);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}
.btn-p {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}
.btn-p:hover {
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
  transform: translateY(-1px);
}
.btn-g {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
}
.btn-g:hover {
  color: var(--text);
  border-color: var(--border-hover);
}
.btn-g.active {
  color: var(--blue);
  border-color: var(--blue);
  background: var(--blue-glow);
}
.btn-lg {
  padding: 0.7rem 1.4rem;
  font-size: 0.95rem;
  border-radius: var(--r);
}
.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.78rem;
}
.btn-block {
  width: 100%;
}
.btn-danger {
  background: var(--red);
  color: #fff;
}

/* === Forms === */
.input {
  width: 100%;
  padding: 0.55rem 0.8rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--text);
  font-size: 0.88rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.input:focus {
  border-color: var(--blue);
}
.label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 0.3rem;
}

/* === Stats === */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all 0.15s;
}
.stat-card:hover {
  border-color: var(--border-hover);
}
.stat-card.click:hover {
  transform: translateY(-2px);
  cursor: pointer;
}
.stat-val {
  font-size: 1.4rem;
  font-weight: 800;
}
.stat-lbl {
  font-size: 0.78rem;
  color: var(--text-3);
}

/* === Heatmap === */
.heatmap {
  display: flex;
  gap: 2px;
  flex-wrap: wrap;
}
.hm {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.04);
}
.hm.l1 {
  background: rgba(34, 197, 94, 0.2);
}
.hm.l2 {
  background: rgba(34, 197, 94, 0.4);
}
.hm.l3 {
  background: rgba(34, 197, 94, 0.6);
}
.hm.l4 {
  background: rgba(34, 197, 94, 0.85);
}

/* === Progress === */
.progress {
  height: 5px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s;
}

/* === Modal === */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.modal.open {
  display: flex;
}
.modal-box {
  background: #111827;
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.8rem;
  max-width: 400px;
  width: 90%;
  animation: modalIn 0.15s ease-out;
}
@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* === Toast === */
#toast {
  position: fixed;
  bottom: -60px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: var(--text);
  padding: 0.55rem 1.1rem;
  border-radius: var(--r-sm);
  font-size: 0.82rem;
  border: 1px solid var(--border);
  transition: bottom 0.3s ease;
  z-index: 300;
  white-space: nowrap;
}
#toast.show {
  bottom: 24px;
}

/* === Views === */
.view {
  display: none;
}
.view.active {
  display: block;
}

/* === Question Options === */
.q-opt {
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  cursor: pointer;
  font-size: 0.88rem;
  transition: all 0.15s;
  background: transparent;
}
.q-opt:hover {
  border-color: var(--blue);
  background: var(--blue-glow);
}
.q-opt.sel {
  border-color: var(--blue);
  background: var(--blue-glow);
}
.q-opt.ok {
  border-color: var(--green);
  background: rgba(34, 197, 94, 0.1);
  color: var(--green);
}
.q-opt.no {
  border-color: var(--red);
  background: rgba(239, 68, 68, 0.1);
  color: var(--red);
}

/* === Table === */
.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.tbl th {
  text-align: left;
  padding: 0.5rem 0.6rem;
  color: var(--text-3);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}
.tbl td {
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
}

/* === Grid helpers === */
.grid {
  display: grid;
  gap: 1rem;
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.gap-sm {
  gap: 0.5rem;
}
.gap {
  gap: 1rem;
}
.gap-lg {
  gap: 1.5rem;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.text-center {
  text-align: center;
}
.mt {
  margin-top: 1rem;
}
.mt-lg {
  margin-top: 2rem;
}
.mb {
  margin-bottom: 1rem;
}
.mb-lg {
  margin-bottom: 2rem;
}

/* === AI FAB === */
#ai-fab {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  transition: transform 0.15s;
}
#ai-fab:hover {
  transform: scale(1.1);
}

/* === Responsive === */
@media (max-width: 768px) {
  .navbar {
    padding: 0 1rem;
  }
  .nav-tabs {
    display: none;
  }
  .container {
    padding: 1.25rem 1rem;
  }
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .grid-auto {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
  .modal-box {
    padding: 1.4rem;
  }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}