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

:root {
  --bg: #08060f;
  --surface: #0f0c1a;
  --surface-2: #161225;
  --border: #1f1a30;
  --border-2: #2a2440;
  --accent: #7c3aed;
  --accent-mid: #6d28d9;
  --accent-light: #a78bfa;
  --accent-glow: rgba(124, 58, 237, 0.15);
  --accent-glow-strong: rgba(124, 58, 237, 0.28);
  --text: #ede9f8;
  --text-muted: #6b6090;
  --text-dim: #3d3460;
  --green: #10b981;
  --orange: #f59e0b;
  --red: #ef4444;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* NAV */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav__logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__logo span {
  color: var(--accent-light);
}

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

.nav__user {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-logout {
  background: none;
  border: 1px solid var(--border-2);
  color: var(--text-muted);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.btn-logout:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

/* LOGIN PAGE */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
}

.login-card__header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-card__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.login-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.login-card__sub {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-group input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
  outline: none;
}

.form-group input:focus {
  border-color: var(--accent);
}

.btn-primary {
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.85rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, transform 0.1s;
  margin-top: 0.5rem;
}

.btn-primary:hover { background: var(--accent-mid); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.form-toggle {
  text-align: center;
  margin-top: 1.2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.form-toggle a {
  color: var(--accent-light);
  cursor: pointer;
  text-decoration: none;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  display: none;
}

.alert--error { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3); color: #fca5a5; }
.alert--success { background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.3); color: #6ee7b7; }

/* DASHBOARD */
.dashboard {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.dashboard__header {
  margin-bottom: 2.5rem;
}

.dashboard__welcome {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.dashboard__sub {
  color: var(--text-muted);
}

/* PROGRESS BAR */
.global-progress {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.progress-info__label { font-weight: 600; }
.progress-info__count { font-size: 0.9rem; color: var(--text-muted); }

.progress-bar {
  height: 8px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 99px;
  transition: width 0.8s ease;
}

/* MODULES GRID */
.modules-section__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.module-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s;
  display: block;
  position: relative;
  overflow: hidden;
}

.module-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.module-card--completed {
  border-color: rgba(16, 185, 129, 0.4);
}

.module-card__badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
}

.badge--completed {
  background: rgba(16,185,129,0.15);
  color: var(--green);
}

.badge--todo {
  background: var(--surface-2);
  color: var(--text-muted);
}

.module-card__icon { font-size: 1.8rem; margin-bottom: 0.75rem; }
.module-card__category {
  font-size: 0.75rem;
  color: var(--accent-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}
.module-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.module-card__desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* MODULE PAGE */
.module-page {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.module-page__back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 2rem;
  transition: color 0.2s;
}

.module-page__back:hover { color: var(--text); }

.module-page__header {
  margin-bottom: 2rem;
}

.module-page__category {
  font-size: 0.8rem;
  color: var(--accent-light);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.module-page__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.module-page__desc {
  color: var(--text-muted);
}

.module-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.module-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 1.5rem 0 0.75rem;
  color: var(--accent-light);
}

.module-content h3:first-child { margin-top: 0; }

.module-content p { margin-bottom: 0.75rem; color: var(--text-muted); }
.module-content p:last-child { margin-bottom: 0; }

.module-content ul {
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
}

.module-content ul li {
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.tip-box {
  background: var(--accent-glow);
  border: 1px solid rgba(124,58,237,0.3);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  font-size: 0.9rem;
  color: var(--accent-light);
}

/* QUIZ */
.quiz-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.quiz-section__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.quiz-section__sub {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.quiz-question {
  display: none;
}

.quiz-question.active { display: block; }

.quiz-question__text {
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 1rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.quiz-option {
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  text-align: left;
  transition: border-color 0.2s, background 0.2s;
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.quiz-option--correct {
  border-color: var(--green) !important;
  background: rgba(16,185,129,0.1) !important;
  color: var(--green) !important;
}

.quiz-option--wrong {
  border-color: var(--red) !important;
  background: rgba(239,68,68,0.1) !important;
  color: #fca5a5 !important;
}

.quiz-feedback {
  font-size: 0.9rem;
  min-height: 1.4em;
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.quiz-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-counter {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-next {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s;
  display: none;
}

.btn-next:hover { background: var(--accent-mid); }

.quiz-result {
  text-align: center;
  display: none;
}

.quiz-result__score {
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 0.5rem;
}

.quiz-result__text {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.btn-complete {
  background: var(--green);
  color: #fff;
  border: none;
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.2s;
}

.btn-complete:hover { opacity: 0.85; }

/* LOADING */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem;
  color: var(--text-muted);
}