:root {
  --yellow: #ffd700;
  --red: #e3000b;
  --blue: #006cb7;
  --green: #00a650;
  --orange: #ff8a00;
  --dark: #1a1a1a;
  --white: #ffffff;
  --radius: 12px;
  --shadow: 4px 4px 0px rgba(0, 0, 0, 0.25);
}

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

body {
  font-family: 'Arial Rounded MT Bold', Arial, sans-serif;
  background-color: #f6f0c1;
  background-image:
    radial-gradient(circle at 24px 24px, rgba(255, 255, 255, 0.28) 0 12px, rgba(0, 0, 0, 0.18) 13px 15px, transparent 16px),
    radial-gradient(circle at 72px 24px, rgba(255, 255, 255, 0.28) 0 12px, rgba(0, 0, 0, 0.18) 13px 15px, transparent 16px),
    radial-gradient(circle at 24px 72px, rgba(255, 255, 255, 0.28) 0 12px, rgba(0, 0, 0, 0.18) 13px 15px, transparent 16px),
    radial-gradient(circle at 72px 72px, rgba(255, 255, 255, 0.28) 0 12px, rgba(0, 0, 0, 0.18) 13px 15px, transparent 16px),
    linear-gradient(90deg, #e3000b 0 33.333%, #ffd700 33.333% 66.666%, #ff8a00 66.666% 100%),
    linear-gradient(90deg, #006cb7 0 33.333%, #42d500 33.333% 66.666%, #e3000b 66.666% 100%),
    linear-gradient(90deg, #42d500 0 33.333%, #006cb7 33.333% 66.666%, #ffd700 66.666% 100%),
    linear-gradient(90deg, #ff8a00 0 33.333%, #e3000b 33.333% 66.666%, #006cb7 66.666% 100%);
  background-size: 96px 96px, 96px 96px, 96px 96px, 96px 96px, 288px 96px, 288px 96px, 288px 96px, 288px 96px;
  background-position: 0 0, 0 0, 0 0, 0 0, 0 0, 0 96px, 0 192px, 0 288px;
  min-height: 100vh;
  color: var(--dark);
}

header {
  background-color: var(--red);
  padding: 16px 24px;
  box-shadow: 0 4px 0px rgba(0, 0, 0, 0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stud-icon {
  font-size: 2rem;
  color: var(--yellow);
  line-height: 1;
  filter: drop-shadow(2px 2px 0 rgba(0, 0, 0, 0.3));
}

h1 {
  font-size: 2rem;
  color: var(--white);
  letter-spacing: 1px;
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.3);
}

.count-badge {
  background: var(--yellow);
  color: var(--dark);
  font-weight: 900;
  font-size: 1rem;
  padding: 6px 16px;
  border-radius: 999px;
  border: 3px solid var(--dark);
  box-shadow: var(--shadow);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px;
}

.add-form {
  display: grid;
  gap: 12px;
  grid-template-columns: 2fr 1fr auto;
  margin-bottom: 8px;
}

.add-form input,
.add-form button,
#search,
#sort {
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  border: 3px solid var(--dark);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  outline: none;
}

.add-form input,
#search,
#sort {
  background: var(--white);
}

.add-form button {
  font-weight: 800;
  cursor: pointer;
  background: var(--green);
  color: var(--white);
}

.add-form button:hover {
  transform: translate(-1px, -1px);
}

.form-message {
  min-height: 1.2em;
  margin-bottom: 16px;
  font-weight: 700;
}

.form-message.success {
  color: var(--green);
}

.form-message.error {
  color: var(--red);
}

.controls {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

#search {
  flex: 1;
  min-width: 220px;
}

#search:focus,
#sort:focus,
.add-form input:focus {
  border-color: var(--blue);
  box-shadow: 4px 4px 0px var(--blue);
}

#sort {
  font-weight: 700;
  cursor: pointer;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--white);
  border: 3px solid var(--dark);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
  cursor: default;
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px rgba(0, 0, 0, 0.25);
}

.card-number {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  font-size: 0.78rem;
  font-weight: 900;
  padding: 4px 10px;
  border-radius: 6px;
  border: 2px solid var(--dark);
  letter-spacing: 0.5px;
  align-self: flex-start;
}

.card-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.3;
}

.card-accent {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--red), var(--blue), var(--green), var(--orange));
  margin-top: 4px;
}

.loading,
.empty,
.error {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  padding: 60px 20px;
  color: var(--dark);
  opacity: 0.6;
}

.error {
  color: var(--red);
  opacity: 1;
}

@media (max-width: 780px) {
  .add-form {
    grid-template-columns: 1fr;
  }

  .add-form button {
    width: 100%;
  }
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }

  .controls {
    flex-direction: column;
  }

  #sort {
    width: 100%;
  }

  .grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

@media (max-width: 380px) {
  .grid {
    grid-template-columns: 1fr;
  }
}