/* The Bass Coach
   Palette comes from the instrument: rosewood board, nickel strings, maple, and the brand orange. */

@font-face {
  font-family: "Big Shoulders";
  src: url("big-shoulders-display.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("instrument-sans.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --rosewood: #140e0b;
  --ebony: #0a0706;
  --orange: #ff6b1a;
  --maple: #f6eee3;
  --nickel: #b8b0a6;
  --string: rgba(246, 238, 227, 0.2);

  --display: "Big Shoulders", "Haettenschweiler", "Arial Narrow", Impact, sans-serif;
  --text: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --pad: clamp(1.25rem, 4.5vw, 3.5rem);
  --gap: clamp(4.5rem, 11vw, 9rem);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--rosewood);
  color: var(--maple);
  font-family: var(--text);
  font-size: 1.125rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p,
ol,
ul,
dl,
dd {
  margin: 0;
}

ol,
ul {
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: 78rem;
  margin-inline: auto;
  padding-inline: var(--pad);
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  padding: 0.6rem 1rem;
  background: var(--orange);
  color: var(--ebony);
  font-weight: 600;
}

.skip:focus {
  top: 1rem;
}

/* Buttons and links */

.btn {
  display: inline-block;
  padding: 0.85rem 1.5rem;
  background: var(--orange);
  color: var(--ebony);
  font-weight: 700;
  text-decoration: none;
  border-radius: 3px;
  transition: background-color 0.15s ease;
}

.btn:hover {
  background: var(--maple);
}

.btn--small {
  padding: 0.55rem 0.9rem;
  font-size: 0.95rem;
  white-space: nowrap;
}

.link {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

.link:hover {
  color: var(--orange);
}

/* Header */

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(20, 14, 11, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--string);
}

.top__row {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 2vw, 1.5rem);
  min-height: 4.25rem;
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: clamp(0.45rem, 1.6vw, 0.7rem);
  margin-right: auto;
  text-decoration: none;
}

.mark__glyph {
  width: clamp(1.6rem, 6vw, 2rem);
  height: clamp(1.6rem, 6vw, 2rem);
  flex: none;
}

.mark__word {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.15rem, 4.4vw, 1.5rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1;
  white-space: nowrap;
}

.top__nav {
  display: none;
  gap: 1.75rem;
  font-size: 0.95rem;
}

.top__nav a {
  color: var(--nickel);
  text-decoration: none;
}

.top__nav a:hover {
  color: var(--maple);
}

@media (min-width: 62rem) {
  .top__nav {
    display: flex;
  }
}

/* Hero */

.hero {
  padding-top: clamp(3rem, 9vw, 7rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
  overflow: hidden;
}

.hero__title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(3.4rem, 10.4vw, 9.4rem);
  line-height: 0.86;
  letter-spacing: -0.005em;
  text-transform: uppercase;
  text-wrap: balance;
}

.hero__title span {
  display: block;
}

.hero__title span + span {
  color: var(--orange);
}

.hero__lead {
  max-width: 36em;
  margin-top: clamp(1.75rem, 4vw, 3rem);
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  color: var(--maple);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.75rem;
  margin-top: 2rem;
}

/* The playable strings */

.strings {
  margin-top: clamp(3rem, 7vw, 5.5rem);
}

.string {
  position: relative;
  display: block;
  width: 100%;
  height: 2.75rem;
  padding: 0;
  border: 0;
  background: none;
  color: var(--nickel);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.string svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.string path {
  fill: none;
  stroke: currentColor;
  vector-effect: non-scaling-stroke;
}

.string:hover,
.string:focus-visible,
.string.is-ringing {
  color: var(--orange);
}

.string:focus-visible {
  outline-offset: -3px;
}

.string--g path { stroke-width: 1.5px; }
.string--d path { stroke-width: 2.25px; }
.string--a path { stroke-width: 3px; }
.string--e path { stroke-width: 4px; }
.string--b path { stroke-width: 5.25px; }

.string__name {
  position: absolute;
  left: var(--pad);
  top: 50%;
  transform: translateY(-50%);
  padding: 0 0.6rem;
  background: var(--rosewood);
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1;
}

@media (min-width: 84rem) {
  .string__name {
    left: calc((100vw - 78rem) / 2 + var(--pad));
  }
}

.strings__hint {
  margin-top: 0.75rem;
  color: var(--nickel);
  font-size: 0.95rem;
}

/* Who it's for: the one loud block on the page */

.plateau {
  background: var(--orange);
  color: var(--ebony);
  padding-block: clamp(4rem, 9vw, 7.5rem);
}

.plateau__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 4rem);
}

.plateau__title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.8rem, 7vw, 6rem);
  line-height: 0.9;
  text-transform: uppercase;
}

.plateau__body {
  display: grid;
  gap: 1.1rem;
  align-content: start;
  font-size: clamp(1.125rem, 1.5vw, 1.3rem);
  font-weight: 500;
}

.plateau__body p:last-child {
  font-weight: 700;
}

@media (min-width: 56rem) {
  .plateau__grid {
    grid-template-columns: 1.1fr 1fr;
    align-items: end;
  }
}

/* Shared section rhythm */

.section {
  padding-block: var(--gap);
}

.section--deep {
  background: var(--ebony);
}

.section__title {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.6rem, 6.2vw, 5rem);
  line-height: 0.95;
  max-width: 22ch;
  text-wrap: balance;
}

.section__lead {
  max-width: 38em;
  margin-top: 1.25rem;
  color: var(--nickel);
}

/* The month, written as one bar of tab */

.bar {
  display: grid;
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

.beat {
  padding-block: 1.5rem;
  border-top: 1px solid var(--string);
}

.beat__staff {
  display: none;
}

.beat__when {
  color: var(--orange);
  font-weight: 600;
  font-size: 0.95rem;
}

.beat__what {
  margin-top: 0.15rem;
  margin-bottom: 0.6rem;
  font-family: var(--display);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1;
}

.beat p:last-child {
  color: var(--nickel);
  font-size: 1rem;
  max-width: 34em;
}

@media (min-width: 56rem) {
  .bar {
    grid-template-columns: repeat(4, 1fr);
  }

  .beat {
    padding: 0 1.5rem 0 0;
    border-top: 0;
  }

  .beat__staff {
    position: relative;
    display: block;
    height: 9rem;
    margin: 0 -1.5rem 2rem 0;
    border-left: 2px solid var(--nickel);
    background:
      linear-gradient(var(--string), var(--string)) 0 0 / 100% 1px no-repeat,
      linear-gradient(var(--string), var(--string)) 0 25% / 100% 1px no-repeat,
      linear-gradient(var(--string), var(--string)) 0 50% / 100% 2px no-repeat,
      linear-gradient(var(--string), var(--string)) 0 75% / 100% 2px no-repeat,
      linear-gradient(var(--string), var(--string)) 0 100% / 100% 3px no-repeat;
  }

  .beat--4 .beat__staff {
    margin-right: 0;
    border-right: 2px solid var(--nickel);
  }

  .beat--4 {
    padding-right: 0;
  }

  .beat__note {
    position: absolute;
    left: 1.25rem;
    transform: translateY(-50%);
    padding: 0 0.5rem;
    background: var(--rosewood);
    color: var(--orange);
    font-family: var(--display);
    font-weight: 900;
    font-size: 2.5rem;
    line-height: 1;
  }

  /* An ascending line: low B up to the D string. */
  .beat--1 .beat__note { top: 100%; }
  .beat--2 .beat__note { top: 75%; }
  .beat--3 .beat__note { top: 50%; }
  .beat--4 .beat__note { top: 25%; }
}

/* What we train: five rows, strung like the instrument, low B first */

.train {
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

.train__row {
  display: grid;
  gap: 0.4rem 2rem;
  padding-block: 1.6rem;
  border-top: solid var(--nickel);
}

.train__row--b { border-top-width: 5px; }
.train__row--e { border-top-width: 4px; }
.train__row--a { border-top-width: 3px; }
.train__row--d { border-top-width: 2px; }
.train__row--g { border-top-width: 1px; }

.train dt {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  line-height: 1;
}

.train__string {
  flex: none;
  width: 1.2ch;
  color: var(--orange);
}

.train dd {
  color: var(--nickel);
  max-width: 36em;
}

@media (min-width: 56rem) {
  .train__row {
    grid-template-columns: 5fr 7fr;
    align-items: baseline;
  }
}

/* Membership: three depths that stack, each one taller than the last */

.depths {
  display: grid;
  gap: 1rem;
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

.depth {
  padding: 1.75rem 1.5rem 2rem;
  border: 1px solid var(--string);
  border-top: 6px solid var(--nickel);
}

.depth--pro {
  border-color: var(--orange);
}

.depth__name {
  font-family: var(--display);
  font-weight: 900;
  font-size: 3rem;
  line-height: 0.95;
  text-transform: uppercase;
}

.depth__sum {
  margin-top: 0.35rem;
  color: var(--nickel);
}

.depth__list {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--string);
  font-size: 1rem;
  color: var(--nickel);
}

.depth__list li {
  position: relative;
  padding-left: 1.5rem;
}

.depth__list li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.62em;
  width: 0.7rem;
  height: 2px;
  background: var(--nickel);
}

.depth__list .is-new {
  color: var(--maple);
  font-weight: 600;
}

.depth__list .is-new::before {
  background: var(--orange);
}

.depth__list .is-new::after {
  content: "";
  position: absolute;
  left: calc(0.15rem + 0.35rem - 1px);
  top: calc(0.62em - 0.35rem + 1px);
  width: 2px;
  height: 0.7rem;
  background: var(--orange);
}

.depth__cap {
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: var(--orange);
}

.depths__note {
  margin-top: 1.75rem;
  color: var(--nickel);
}

@media (min-width: 56rem) {
  .depths {
    grid-template-columns: repeat(3, 1fr);
    align-items: end;
  }
}

/* Coaches */

.coaches {
  display: grid;
  gap: 3rem;
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

.coach__name {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  line-height: 0.9;
  text-transform: uppercase;
}

.coach__role {
  margin-top: 0.6rem;
  margin-bottom: 0.9rem;
  color: var(--orange);
  font-weight: 600;
}

.coach p:last-child {
  color: var(--nickel);
  max-width: 30em;
}

.coaches__guests {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--string);
  color: var(--nickel);
  max-width: 38em;
}

@media (min-width: 56rem) {
  .coaches {
    grid-template-columns: 1fr 1fr;
  }
}

/* Questions */

.questions {
  display: grid;
  gap: 2.5rem;
}

.faq details {
  border-top: 1px solid var(--string);
}

.faq details:last-child {
  border-bottom: 1px solid var(--string);
}

.faq summary {
  position: relative;
  padding: 1.25rem 3rem 1.25rem 0;
  font-weight: 600;
  font-size: 1.2rem;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before,
.faq summary::after {
  content: "";
  position: absolute;
  right: 0.4rem;
  top: 50%;
  width: 1rem;
  height: 2px;
  margin-top: -1px;
  background: var(--orange);
  transition: transform 0.2s ease;
}

.faq summary::after {
  transform: rotate(90deg);
}

.faq details[open] summary::after {
  transform: rotate(0deg);
}

.faq summary:hover {
  color: var(--orange);
}

.faq details p {
  padding-bottom: 1.5rem;
  color: var(--nickel);
  max-width: 38em;
}

@media (min-width: 62rem) {
  .questions {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
}

/* Closing call */

.join {
  padding-block: var(--gap);
  background: var(--ebony);
  border-top: 5px solid var(--orange);
}

.join__title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(3.4rem, 11vw, 9rem);
  line-height: 0.86;
  text-transform: uppercase;
}

.join__lead {
  max-width: 34em;
  margin-top: 1.5rem;
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  color: var(--nickel);
}

/* Footer */

.foot {
  padding-block: 2rem;
  border-top: 1px solid var(--string);
  font-size: 0.95rem;
  color: var(--nickel);
}

.foot__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 2rem;
}

.foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

/* Plain pages: privacy, not found */

.page {
  padding-block: clamp(3rem, 8vw, 6rem) var(--gap);
}

.page__title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 0.9;
  text-transform: uppercase;
}

.page__body {
  display: grid;
  gap: 1.1rem;
  max-width: 38em;
  margin-top: 2.5rem;
  color: var(--nickel);
}

.page__body h2 {
  margin-top: 1.5rem;
  color: var(--maple);
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.9rem;
  line-height: 1;
}

.page__body strong {
  color: var(--maple);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn,
  .faq summary::before,
  .faq summary::after {
    transition: none;
  }
}