/* SkyPilot Drone Academy - Styles */
:root {
  --navy: #0a1628;
  --navy-light: #122240;
  --navy-mid: #1a2f4a;
  --blue: #1e4d8c;
  --blue-bright: #2a6bb5;
  --turquoise: #00c9b1;
  --turquoise-dark: #00a894;
  --turquoise-glow: rgba(0, 201, 177, 0.25);
  --text: #e8f0f8;
  --text-muted: #8ba3b8;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --card-bg: #132337;
  --border: rgba(0, 201, 177, 0.15);
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Vazirmatn', 'Tahoma', 'Segoe UI', sans-serif;
  background: var(--navy);
  color: var(--text);
  line-height: 1.7;
  direction: rtl;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  white-space: nowrap;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--turquoise), var(--blue-bright));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.nav {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-btn:hover,
.nav-btn.active {
  color: var(--turquoise);
  background: var(--turquoise-glow);
}

.menu-toggle {
  display: none;
  background: var(--navy-mid);
  border: 1px solid var(--border);
  color: var(--text);
  width: 44px;
  height: 44px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.4rem;
  align-items: center;
  justify-content: center;
}

/* Main */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  min-height: calc(100vh - 140px);
}

.section {
  display: none;
  animation: fadeIn 0.35s ease;
}

.section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--turquoise);
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  font-size: 0.95rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 2.5rem 1rem 3rem;
  background: linear-gradient(180deg, var(--navy-light) 0%, var(--navy) 100%);
  border-radius: var(--radius);
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(0, 201, 177, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  background: linear-gradient(90deg, var(--turquoise), #5eead4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 1.75rem;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.4rem;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  min-height: 48px;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--turquoise), var(--turquoise-dark));
  color: #042f2e;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 201, 177, 0.4);
}

.btn-secondary {
  background: var(--navy-mid);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--turquoise);
  color: var(--turquoise);
}

.btn-outline {
  background: transparent;
  color: var(--turquoise);
  border: 1.5px solid var(--turquoise);
}

.btn-outline:hover:not(:disabled) {
  background: var(--turquoise-glow);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  min-height: 36px;
  font-size: 0.85rem;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
  cursor: pointer;
}

.feature-card:hover {
  border-color: var(--turquoise);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.feature-card .icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
  color: var(--turquoise);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Checklist */
.checklist-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.stat-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
}

.stat-box .num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--turquoise);
}

.stat-box .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.progress-wrap {
  margin-bottom: 1.5rem;
}

.progress-bar {
  height: 10px;
  background: var(--navy-mid);
  border-radius: 5px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--turquoise), var(--blue-bright));
  border-radius: 5px;
  transition: width 0.4s ease;
  width: 0%;
}

.checklist-category {
  margin-bottom: 1.5rem;
}

.checklist-category h3 {
  font-size: 1.05rem;
  color: var(--turquoise);
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.5rem;
  transition: var(--transition);
}

.check-item.checked {
  border-color: rgba(34, 197, 94, 0.4);
  background: rgba(34, 197, 94, 0.06);
}

.check-item.issue {
  border-color: rgba(239, 68, 68, 0.4);
  background: rgba(239, 68, 68, 0.06);
}

.check-item label {
  flex: 1;
  cursor: pointer;
  font-size: 0.92rem;
  line-height: 1.5;
}

.status-btns {
  display: flex;
  gap: 0.35rem;
  flex-shrink: 0;
}

.status-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--navy-mid);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.status-btn:hover {
  border-color: var(--turquoise);
}

.status-btn.active-ok {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.status-btn.active-issue {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.checklist-result {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.checklist-result h3 {
  margin-bottom: 0.75rem;
  color: var(--turquoise);
}

.checklist-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* Catalog */
.catalog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  align-items: center;
}

.catalog-filters input,
.catalog-filters select {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  min-height: 44px;
}

.catalog-filters input {
  flex: 1;
  min-width: 180px;
}

.catalog-filters select {
  min-width: 140px;
  cursor: pointer;
}

.drone-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.drone-card:hover {
  border-color: var(--turquoise);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.drone-img {
  height: 140px;
  background: linear-gradient(135deg, var(--navy-mid), var(--blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
}

.drone-badge {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--turquoise);
  color: #042f2e;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
}

.drone-body {
  padding: 1rem 1.15rem 1.25rem;
}

.drone-body h3 {
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.drone-brand {
  font-size: 0.8rem;
  color: var(--turquoise);
  margin-bottom: 0.5rem;
}

.drone-specs {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.drone-specs span {
  display: block;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--navy-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 1.5rem;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: var(--navy-mid);
  border: none;
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
}

.modal h2 {
  color: var(--turquoise);
  margin-bottom: 0.75rem;
  padding-left: 2.5rem;
}

.modal-specs {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.modal-specs strong {
  color: var(--text);
}

/* Quiz */
.quiz-start, .quiz-question, .quiz-result {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.quiz-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.quiz-q-text {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  line-height: 1.6;
  text-align: right;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
  text-align: right;
}

.quiz-option {
  background: var(--navy-mid);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
  text-align: right;
  min-height: 52px;
  display: flex;
  align-items: center;
}

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

.quiz-option.selected {
  border-color: var(--turquoise);
  background: var(--turquoise-glow);
}

.quiz-option.correct {
  border-color: var(--success);
  background: rgba(34, 197, 94, 0.15);
}

.quiz-option.wrong {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.15);
}

.quiz-option.disabled {
  pointer-events: none;
}

.quiz-feedback {
  background: var(--navy-mid);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1.25rem;
  text-align: right;
  font-size: 0.92rem;
  display: none;
}

.quiz-feedback.show {
  display: block;
}

.quiz-feedback.ok {
  border: 1px solid rgba(34, 197, 94, 0.4);
}

.quiz-feedback.fail {
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.result-score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--turquoise);
  margin: 0.5rem 0;
}

.result-detail {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.mistakes-list {
  text-align: right;
  margin: 1.25rem 0;
}

.mistake-item {
  background: var(--navy-mid);
  border-radius: 8px;
  padding: 0.9rem;
  margin-bottom: 0.6rem;
  font-size: 0.88rem;
}

.mistake-item .q {
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.mistake-item .wrong-ans {
  color: var(--danger);
}

.mistake-item .right-ans {
  color: var(--success);
}

/* Tutorials */
.tutorial-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tut-tab {
  background: var(--navy-mid);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.55rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  transition: var(--transition);
}

.tut-tab:hover,
.tut-tab.active {
  color: var(--turquoise);
  border-color: var(--turquoise);
  background: var(--turquoise-glow);
}

.tut-content {
  display: none;
}

.tut-content.active {
  display: block;
}

.tut-step {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.tut-step h4 {
  color: var(--turquoise);
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.tut-step p, .tut-step ul {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.tut-step ul {
  padding-right: 1.25rem;
  margin-top: 0.4rem;
}

.tut-step li {
  margin-bottom: 0.3rem;
}

/* Concepts */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.concept-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.concept-card h3 {
  color: var(--turquoise);
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.concept-card .meaning {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}

.concept-card p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* Resources */
.resource-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.resource-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.resource-item a {
  color: var(--turquoise);
  text-decoration: none;
  font-weight: 600;
  word-break: break-all;
}

.resource-item a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--navy-light);
    flex-direction: column;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
    gap: 0.25rem;
  }

  .nav.open {
    display: flex;
  }

  .nav-btn {
    width: 100%;
    text-align: right;
    padding: 0.75rem 1rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .checklist-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .status-btns {
    flex-direction: column;
  }

  .catalog-filters {
    flex-direction: column;
    align-items: stretch;
  }

  .catalog-filters input,
  .catalog-filters select {
    width: 100%;
  }

  .quiz-start, .quiz-question, .quiz-result {
    padding: 1.5rem 1rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .checklist-actions {
    flex-direction: column;
  }

  .checklist-actions .btn {
    width: 100%;
  }
}

@media (max-width: 400px) {
  .main {
    padding: 1rem;
  }

  .header {
    padding: 0.6rem 1rem;
  }

  .logo span {
    font-size: 0.95rem;
  }
}