:root {
  --black: #1c1c1c;
  --white: #fff;
  --light-grey: #e8e8e8;
  --grey: #80818f;
  --yellow: #f9f383;
  --red: #f14553;
  --blue: #19477e;
  --purple: #7429d3;
  --orange: #f5966a;
  --pink: #ef8bff;
  --yellow-text: #a68b00;
  --green: #1a7f37;
  --accent-gradient: linear-gradient(
    90deg,
    var(--red),
    var(--orange),
    var(--pink),
    var(--purple),
    var(--blue)
  );
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
  color: var(--black);
  background: var(--light-grey);
}

header {
  background: var(--black);
  color: var(--white);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 4px solid;
  border-image: var(--accent-gradient) 1;
}

header .logo {
  height: 26px;
}

.header-actions {
  text-align: right;
}

.header-actions .muted {
  margin: 0.35rem 0 0;
  max-width: 240px;
  font-size: 0.82rem;
}

.session-status {
  text-align: center;
  padding: 0.5rem;
  margin: 0;
  background: var(--white);
  border-bottom: 1px solid #d8d8d8;
}

.login-section {
  max-width: 480px;
  margin: 2rem auto;
  background: var(--white);
  border: 1px solid #d8d8d8;
  border-radius: 10px;
  padding: 1.5rem;
  text-align: center;
}

.login-section code {
  background: var(--light-grey);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}

.login-section button {
  background: var(--red);
  margin-top: 0.5rem;
}

.login-section form {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.login-section input[type="password"] {
  flex: 1;
  padding: 0.45rem 0.7rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 0.9rem;
}

.login-section form button {
  margin-top: 0;
}

main {
  max-width: 1500px;
  margin: 0 auto;
  padding: 1.5rem;
}

.muted {
  color: var(--grey);
  font-size: 0.9rem;
}

section {
  margin-bottom: 2rem;
}

h2 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 0.75rem;
}

button {
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 6px;
  padding: 0.45rem 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}

button:hover:not(:disabled) {
  opacity: 0.8;
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

button.secondary {
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--black);
}

button.slot-add.cat-muay-thai {
  background: var(--blue);
}
button.slot-add.cat-bjj {
  background: var(--red);
}
button.slot-add.cat-other {
  background: var(--yellow);
  color: var(--black);
}

button.slot-picked {
  background: var(--white);
  color: var(--grey);
  border: 1px solid #ccc;
}

.picks-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.picks-chips:empty + .muted {
  display: block;
}

.chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--white);
  border: 1px solid var(--black);
  border-radius: 999px;
  padding: 0.3rem 0.4rem 0.3rem 0.9rem;
  font-size: 0.85rem;
}

.chip .chip-time {
  font-weight: 700;
  color: var(--red);
}

.chip.cat-muay-thai {
  border-color: var(--blue);
}
.chip.cat-muay-thai .chip-time {
  color: var(--blue);
}
.chip.cat-bjj {
  border-color: var(--red);
}
.chip.cat-other {
  border-color: var(--yellow-text);
}
.chip.cat-other .chip-time {
  color: var(--yellow-text);
}

.chip.is-booked {
  background: #eaf6ee;
  border-color: var(--green);
}

.booked-badge {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.05rem 0.4rem;
  border-radius: 999px;
  background: var(--green);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  vertical-align: middle;
}

.chip button {
  background: var(--black);
  color: var(--white);
  border-radius: 50%;
  width: 1.4rem;
  height: 1.4rem;
  padding: 0;
  line-height: 1;
  font-size: 0.85rem;
}

.schedule-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.schedule-header h2 {
  margin: 0;
}

.day-columns {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.day-column {
  flex: 1 1 0;
  min-width: 190px;
  background: var(--white);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #d8d8d8;
}

.day-column h3 {
  margin: 0;
  background: var(--black);
  color: var(--white);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.55rem 0.75rem;
}

.slot-row {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid #eee;
  border-left: 3px solid transparent;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.slot-row:last-child {
  border-bottom: none;
}

.slot-row.cat-muay-thai {
  border-left-color: var(--blue);
}
.slot-row.cat-bjj {
  border-left-color: var(--red);
}
.slot-row.cat-other {
  border-left-color: var(--yellow-text);
}

.slot-time {
  font-weight: 700;
  font-size: 0.82rem;
}

.cat-muay-thai .slot-time {
  color: var(--blue);
}
.cat-bjj .slot-time {
  color: var(--red);
}
.cat-other .slot-time {
  color: var(--yellow-text);
}

.slot-name {
  font-size: 0.85rem;
  line-height: 1.25;
}

.slot-row button {
  align-self: flex-start;
  font-size: 0.78rem;
  padding: 0.3rem 0.7rem;
}

@media (max-width: 700px) {
  header {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  header .logo {
    height: 22px;
  }
  .header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  .header-actions .muted {
    max-width: none;
    margin: 0;
  }
  button {
    font-size: 0.82rem;
    padding: 0.4rem 0.8rem;
  }
  main {
    padding: 1rem 0.75rem;
  }
  .login-section {
    margin: 1.25rem auto;
    padding: 1.25rem 1rem;
  }

  /* Stack days vertically instead of horizontal-scrolling columns —
     swiping through 7 narrow columns doesn't work well on a phone. */
  .day-columns {
    flex-direction: column;
    overflow-x: visible;
  }
  .day-column {
    flex-basis: auto;
    min-width: 0;
    width: 100%;
  }
  .day-column h3 {
    position: sticky;
    top: 0;
  }

  .slot-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
  }
  .slot-time {
    flex: 0 0 auto;
  }
  .slot-name {
    flex: 1 1 auto;
    min-width: 0;
  }
  .slot-row button {
    flex: 0 0 auto;
  }
}