/* ===== Цвета ===== */
:root {
  --pastel-blue: #dbeafe;
  --pastel-purple: #ede9fe;
  --pastel-green: #dcfce7;
  --pastel-yellow: #fef9c3;
  --pastel-pink: #fce7f3;
  --pastel-orange: #ffedd5;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --text-main: #1e1b4b;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f9fafb;
  --white: #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
}

/* ===== Navbar ===== */
.navbar {
  background: var(--white) !important;
  border-bottom: 1px solid var(--border);
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--accent) !important;
  letter-spacing: -0.5px;
}

/* ===== Кнопки ===== */
.btn-accent {
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
}

.btn-accent:hover {
  background-color: var(--accent-hover);
  color: white;
}

/* ===== Hero ===== */
.hero-section {
  background: linear-gradient(135deg, var(--pastel-blue) 0%, var(--pastel-purple) 100%);
  padding: 60px 0 50px;
}

.search-bar {
  max-width: 560px;
}

.search-bar .form-control {
  border-radius: 10px 0 0 10px;
  border: 2px solid var(--white);
  box-shadow: none;
  font-size: 1rem;
}

.search-bar .form-control:focus {
  border-color: var(--accent);
  box-shadow: none;
}

.search-bar .btn {
  border-radius: 0 10px 10px 0;
  background: var(--accent);
  border: 2px solid var(--accent);
  color: white;
  font-weight: 600;
}

/* ===== Фильтры предметов ===== */
.badge-filter {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  text-decoration: none;
  background: var(--white);
  transition: all 0.15s;
  cursor: pointer;
}

.badge-filter:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.badge-filter.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ===== Карточки наборов ===== */
/* Разные пастельные цвета для предметов */
.set-card {
  display: block;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  transition: box-shadow 0.15s, transform 0.15s;
  height: 100%;
  text-decoration: none;
  color: var(--text-main);
}

.set-card:hover {
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.12);
  transform: translateY(-3px);
  color: var(--text-main);
}

.set-card-subject {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  padding: 3px 10px;
  border-radius: 20px;
  display: inline-block;
}

/* Цвета по предметам */
.subject-math    { background: var(--pastel-blue);   color: #1d4ed8; }
.subject-history { background: var(--pastel-yellow);  color: #92400e; }
.subject-english { background: var(--pastel-green);   color: #166534; }
.subject-biology { background: var(--pastel-green);   color: #166534; }
.subject-chemistry { background: var(--pastel-orange); color: #9a3412; }
.subject-physics { background: var(--pastel-blue);   color: #1d4ed8; }
.subject-social  { background: var(--pastel-pink);   color: #9d174d; }
.subject-default { background: var(--pastel-purple);  color: #5b21b6; }

.set-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}

.set-card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.set-card-author {
  font-size: 0.78rem;
  color: #a5b4fc;
}

/* ===== Формы авторизации ===== */
.auth-card {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 18px;
  padding: 40px;
  max-width: 420px;
  margin: 60px auto;
  box-shadow: 0 4px 24px rgba(99,102,241,0.07);
}

.auth-card h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
}

.form-control:focus {
  box-shadow: none;
  border-color: var(--accent);
}

.form-select:focus {
  box-shadow: none;
  border-color: var(--accent);
}

/* ===== Страница набора ===== */
.set-detail-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 36px 0 28px;
}

.card-item {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  display: flex;
  gap: 24px;
}

.card-item-question {
  flex: 1;
  font-weight: 600;
  font-size: 0.95rem;
}

.card-item-answer {
  flex: 1;
  color: var(--text-muted);
  font-size: 0.95rem;
  border-left: 3px solid var(--pastel-purple);
  padding-left: 20px;
}

/* ===== Режим изучения ===== */
.study-card {
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: 20px;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  user-select: none;
}

.study-card:hover {
  box-shadow: 0 8px 30px rgba(99,102,241,0.12);
  border-color: var(--accent);
}

.study-card.flipped {
  background: var(--pastel-purple);
  border-color: var(--accent);
}

.study-card-text {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  padding: 40px;
  color: var(--text-main);
}

.study-card-hint {
  position: absolute;
  bottom: 16px;
  font-size: 0.78rem;
  color: #a5b4fc;
}

/* ===== Создание набора ===== */
.create-card-row {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color 0.15s;
}

.create-card-row:focus-within {
  border-color: var(--accent);
}

/* ===== Профиль ===== */
.profile-header {
  background: linear-gradient(135deg, var(--pastel-purple) 0%, var(--pastel-blue) 100%);
  border-bottom: 1px solid var(--border);
  padding: 36px 0;
}

.avatar-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
}

.tab-nav .nav-link {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 10px 0;
  margin-right: 28px;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: none;
}

.tab-nav .nav-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ===== Алерты ===== */
.alert-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #dc2626;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.88rem;
}

.alert-success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #16a34a;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.88rem;
}

/* ===== Прогресс бар ===== */
.progress {
  border-radius: 10px;
  background: var(--pastel-purple);
}

.progress-bar {
  background: var(--accent);
  border-radius: 10px;
}

/* ===== Адаптив ===== */
@media (max-width: 576px) {
  .hero-section {
    padding: 40px 0 30px;
  }

  .hero-section h1 {
    font-size: 1.6rem;
  }

  .auth-card {
    margin: 20px auto;
    padding: 28px 20px;
  }

  .study-card-text {
    font-size: 1.1rem;
    padding: 24px;
  }

  .card-item {
    flex-direction: column;
    gap: 10px;
  }

  .card-item-answer {
    border-left: none;
    border-top: 3px solid var(--pastel-purple);
    padding-left: 0;
    padding-top: 10px;
  }
}

/* ===== Кнопка лайка на карточке набора ===== */
.like-btn-small {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.82rem;
  color: #9ca3af;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 3px;
  transition: color 0.15s;
}

.like-btn-small:hover {
  color: #a21caf;
}

.like-btn-small.liked {
  color: #a21caf;
}