/* =========================================================================
   Landing page.

   Six screens, one idea each, over one long sound wave. The wave does the
   decorating, so everything in front of it stays plain: centred type, lots of
   room, and nothing boxed in.
   ========================================================================= */

.landing { position: relative; }

/* The wave behind the page. Faint, so it never competes with the words. */
.wave-backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  color: var(--ink);
  --wave-played: var(--brass);
  --wave-ahead-alpha: 0.075;
  --wave-played-alpha: 0.26;
}
:root[data-theme="dark"] .wave-backdrop {
  --wave-ahead-alpha: 0.1;
  --wave-played-alpha: 0.22;
}
.wave-canvas { display: block; width: 100%; height: 100%; }

.landing > :not(.wave-backdrop) { position: relative; z-index: 1; }

.landing-nav {
  position: absolute;
  inset: 0 0 auto;
  z-index: 2;
  padding: var(--space-5) 0;
}

/* --- Screens ------------------------------------------------------------- */
.screen {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: var(--space-10) var(--space-5);
  text-align: center;
}
.screen-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: min(100%, 46rem);
}

.screen-eyebrow {
  margin: 0 0 var(--space-5);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.screen-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2.1rem, 5.2vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 18ch;
  text-wrap: balance;
}
.screen-title-hero { font-size: clamp(2.3rem, 6.4vw, 4.6rem); max-width: none; }
.screen-title-line { display: block; }
/* The rotating words share one cell sized to the longest, so each sits at its
   start rather than floating in the middle of the cell. */
.screen-title-hero .rotator-word { text-align: left; }

.screen-lede {
  margin: var(--space-6) 0 0;
  max-width: 34ch;
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.5;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.screen-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

/* What the sample lesson is saying, while it says it. */
.screen-caption {
  margin: var(--space-6) 0 0;
  min-height: 3em;
  max-width: 36ch;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink-faint);
}

/* --- Three steps --------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-7);
  width: min(100vw - 2 * var(--space-5), 58rem);
  margin: var(--space-9) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li { counter-increment: step; }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: var(--space-3);
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  color: var(--brass-deep);
}
.steps h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 500;
}
.steps p {
  margin: 0 auto;
  max-width: 22ch;
  color: var(--ink-soft);
  line-height: var(--leading-relaxed);
}
@media (max-width: 760px) {
  .steps { grid-template-columns: 1fr; gap: var(--space-8); }
}

.landing-foot { padding: var(--space-6) 0 var(--space-7); }

@media (max-width: 600px) {
  .screen { padding-inline: var(--space-4); }
  .screen-actions { flex-direction: column; align-items: stretch; width: min(100%, 20rem); }
}

/* --- Auth ---------------------------------------------------------------- */
.auth-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.auth-aside {
  background: var(--night);
  color: var(--night-text);
  padding: var(--space-8) var(--space-7);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-6);
  --floor: var(--brass);
  position: relative;
  overflow: hidden;
}
.auth-aside::before {
  content: "";
  position: absolute; inset: 0 0 auto; height: 60%;
  background: radial-gradient(110% 90% at 30% 0%, var(--brass-glow) 0%, transparent 70%);
  opacity: 0.55;
}
.auth-aside > * { position: relative; z-index: 1; }
.auth-aside .resonance { width: min(12rem, 30vw); }
.auth-aside h2 {
  font-size: var(--text-2xl);
  color: var(--night-text);
  max-width: 18ch;
  line-height: 1.15;
}
.auth-aside p { color: var(--night-soft); max-width: 40ch; font-size: var(--text-sm); }

.auth-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-7) var(--space-5);
}
.auth-form { width: min(24rem, 100%); }
.auth-form h1 { font-size: var(--text-2xl); margin-bottom: var(--space-2); }

@media (max-width: 860px) {
  .auth-page { grid-template-columns: 1fr; }
  .auth-aside { display: none; }
}

/* -------------------------------------------------------------------------
   The rotating word.

   Every word occupies the same grid cell, so the headline never reflows as
   they swap. The motion is a short rise: the outgoing word leaves upward and
   the incoming one arrives from below, which reads as a list being turned
   rather than as text glitching.
   ---------------------------------------------------------------------- */
.rotator {
  display: inline-grid;
  vertical-align: baseline;
  /* Clipped so a word in flight cannot sit on the line above or below. */
  overflow: hidden;
  padding-bottom: 0.08em;
}
.rotator-stack { display: grid; }
.rotator-word {
  grid-area: 1 / 1;
  white-space: nowrap;
  color: var(--brass-deep);
  font-style: italic;
  transition: transform 480ms var(--ease-spring), opacity 280ms var(--ease-out);
}
.rotator-word[data-state="in"]    { transform: translateY(0);      opacity: 1; }
.rotator-word[data-state="below"] { transform: translateY(0.9em);  opacity: 0; }
.rotator-word[data-state="above"] { transform: translateY(-0.9em); opacity: 0; }

@media (prefers-reduced-motion: reduce) {
  .rotator-word { transition: none; }
}

/* The dot field sits behind everything in the panel it decorates. */
.dotfield {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}