:root {
  --tut-bg: #f4f7ff;
  --tut-card: #ffffff;
  --tut-text: #1e2a56;
  --tut-soft: #64719a;
  --tut-primary: #5f79f6;
  --tut-border: rgba(95, 121, 246, 0.18);
  --tut-shadow: 0 16px 38px rgba(34, 63, 170, 0.12);
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  background: radial-gradient(circle at top right, rgba(163, 177, 255, 0.34), transparent 34%), var(--tut-bg);
  color: var(--tut-text);
}

.tut-page {
  min-height: 100vh;
}

.tut-container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.tut-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(246, 248, 255, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--tut-border);
}

.tut-header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.tut-logo img {
  width: 140px;
  height: auto;
}

.tut-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--tut-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
}

.tut-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--tut-soft);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
}

.tut-nav a.active,
.tut-nav a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--tut-primary), #7f97ff);
}

.tut-main {
  padding-top: 84px;
  padding-bottom: 52px;
}

.tut-hero {
  padding: 54px 0 24px;
}

.tut-kicker {
  margin: 0 0 14px;
  color: var(--tut-primary);
  font-weight: 800;
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tut-hero h1 {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.02;
  color: #4f67e8;
}

.tut-hero p {
  max-width: 760px;
  margin-top: 18px;
  color: var(--tut-soft);
  line-height: 1.75;
}

.tut-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.tut-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--tut-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  color: #415289;
  font-size: 0.84rem;
  font-weight: 700;
}

.tut-content {
  padding-top: 18px;
}

.tut-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 22px;
}

.tut-search-wrap {
  flex: 1;
  max-width: 420px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  min-height: 48px;
  border: 1px solid var(--tut-border);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(34, 63, 170, 0.08);
}

.tut-search-wrap i {
  color: #9aa8ce;
}

.tut-search-wrap input {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
}

.tut-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 16px;
  border-radius: 12px;
  border: 1px solid var(--tut-border);
  background: #fff;
  color: #334884;
  font-weight: 700;
  text-decoration: none;
}

.tut-grid {
  display: block;
}

.tut-grid-group {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.tut-group + .tut-group {
  margin-top: 34px;
}

.tut-group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.tut-group-head h2 {
  margin: 0;
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--color-primary);
}

.tut-group-count {
  font-size: 0.8rem;
  font-weight: 700;
  color: #5f6f9e;
  border: 1px solid var(--tut-border);
  border-radius: 999px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.82);
}

.tut-card {
  border: 1px solid var(--tut-border);
  border-radius: 18px;
  background: var(--tut-card);
  box-shadow: var(--tut-shadow);
  overflow: hidden;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease;
}

.tut-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(34, 63, 170, 0.16);
}

.tut-card-cover {
  position: relative;
  aspect-ratio: 16 / 8;
  background: #dbe4ff;
  cursor: pointer;
}

.tut-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tut-play-pill {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 1.25rem;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.35);
  pointer-events: none;
}

.tut-play-pill i {
  transform: translateX(1px);
}

.tut-card-body {
  padding: 12px 14px 13px;
  position: relative;
}

.tut-card-page {
  margin: 0;
  color: #5f6f9e;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tut-card-title {
  color: var(--color-text-dark);
  max-width: 85%;
  margin: 6px 0 0;
  font-size: 0.98rem;
  font-weight: 800;
  line-height: 1.3;
  min-height: 1.8rem;
}

.tut-empty {
  grid-column: 1 / -1;
  padding: 36px 18px;
  border: 1px dashed #bdccff;
  border-radius: 16px;
  text-align: center;
  color: #536495;
}

.tut-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  padding: 18px;
}

.tut-modal.open {
  display: grid;
  place-items: center;
}

.tut-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(9, 18, 45, 0.82);
  backdrop-filter: blur(7px);
}

.tut-modal-dialog {
  position: relative;
  z-index: 1;
  width: min(960px, 100%);
  background: #fff;
  border-radius: 18px;
  border: 1px solid #d9e3ff;
  padding: 18px;
  box-shadow: 0 24px 70px rgba(14, 30, 82, 0.46);
}

.tut-modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid #d6dffc;
  background: #fff;
  color: #445cae;
}

.tut-modal-dialog h2 {
  margin: 0 44px 12px 0;
  font-size: 1.2rem;
  color: #1f2b58;
}

.tut-video-frame {
  border-radius: 12px;
  overflow: hidden;
  background: #0f172a;
}

.tut-video-frame iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
}

.tut-source-link {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  color: #3854be;
  font-weight: 700;
  font-size: 0.84rem;
  text-decoration: none;
  position: absolute;
  right: 10px;
  top: 10px;
  background-color: #f1f5f9;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.tut-modal-source-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  color: #4f67e8;
  font-weight: 700;
  font-size: 0.94rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.tut-modal-source-link:hover {
  text-decoration: underline;
  color: #3854be;
}

@media (max-width: 1024px) {
  .tut-grid-group {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .tut-container {
    width: min(1180px, calc(100% - 24px));
  }

  .tut-header-inner {
    min-height: 68px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 12px 0;
  }

  .tut-nav {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .tut-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .tut-search-wrap {
    max-width: none;
  }

  .tut-grid-group {
    grid-template-columns: 1fr;
  }

  .tut-main {
    padding-top: 96px;
  }

  .tut-modal {
    padding: 10px;
  }
}