/* Word Mountain — a daily word-ladder climb from base word to summit word. */

:root {
  --wm-bg-1: #16233a;
  --wm-bg-2: #0a1220;
  --wm-ice: #eaf3fb;
  --wm-ice-soft: #a9c4dd;
  --wm-accent: #7cc6fe;
  --wm-accent-soft: rgba(124, 198, 254, 0.32);
  --wm-summit: #ffd76b;
  --wm-summit-soft: rgba(255, 215, 107, 0.28);
  --wm-good: #7bd88f;
  --wm-bad: #ff6b6b;
  --font-sans: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica,
    Arial, sans-serif;
}

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

.wm-body {
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  background: radial-gradient(ellipse at 50% 0%, #2d4468 0%, #142137 45%, #060b14 100%);
  background-attachment: fixed;
  color: var(--wm-ice);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  display: flex;
  justify-content: center;
  padding: clamp(1rem, 4vmin, 3rem);
}

.wm {
  width: 100%;
  max-width: 40rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  animation: wm-rise 0.6s ease-out both;
}

@keyframes wm-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

.wm__header {
  max-width: 34rem;
}

.wm__logo {
  display: block;
  width: min(28vw, 5.5rem);
  height: auto;
  margin: 0 auto 0.75rem;
}

.wm__eyebrow {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--wm-ice);
}

.wm__title {
  margin: 0.5rem 0 0;
  font-size: clamp(1.75rem, 5vmin, 2.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-wrap: balance;
}

.wm__tagline {
  margin: 0.75rem 0 0;
  color: var(--wm-ice-soft);
  font-size: clamp(0.875rem, 2vmin, 1.0625rem);
  line-height: 1.6;
  text-wrap: balance;
}

.wm__rules {
  margin-top: 1.5rem;
  width: 100%;
}

.wm__rules-list {
  list-style: none;
  margin: 0;
  padding: 0.9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: left;
  font-size: 0.875rem;
  color: var(--wm-ice-soft);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--wm-accent-soft);
  border-radius: 0.75rem;
}

.wm__rules-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.wm__rule-icon {
  flex: none;
}

/* Difficulty tabs */

.wm__difficulty {
  margin-top: 1.5rem;
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  border: 1px solid var(--wm-accent-soft);
  border-radius: 0.6rem;
  overflow: hidden;
}

.wm__difficulty-btn {
  padding: 0.55rem 1rem;
  border: 0;
  background: transparent;
  color: var(--wm-ice-soft);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.wm__difficulty-btn + .wm__difficulty-btn {
  border-left: 1px solid var(--wm-accent-soft);
}

.wm__difficulty-btn[aria-pressed="true"] {
  background: var(--wm-accent);
  color: #0a1220;
}

/* Status + stats */

.wm__status {
  margin: 1.25rem 0 0;
  min-height: 1.5em;
  font-weight: 600;
  color: var(--wm-ice-soft);
}

.wm__status--good {
  color: var(--wm-good);
}

.wm__status--bad {
  color: var(--wm-bad);
}

.wm__stats-bar {
  margin-top: 0.75rem;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.25rem;
  font-size: 0.8125rem;
  color: var(--wm-ice-soft);
}

.wm__stats-bar strong {
  color: var(--wm-ice);
}

/* Mountain visualization */

.wm__mountain-wrap {
  margin-top: 1.5rem;
  width: 100%;
  padding: 1.25rem 1rem 1.5rem;
  background: linear-gradient(180deg, rgba(124, 198, 254, 0.08), rgba(0, 0, 0, 0.2));
  border: 1px solid var(--wm-accent-soft);
  border-radius: 0.9rem;
}

.wm__summit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin: 0 0 0.75rem;
  padding: 0.6rem 1rem;
  border-radius: 0.6rem;
  background: var(--wm-summit-soft);
  border: 1px solid var(--wm-summit);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--wm-summit);
}

.wm__summit-icon {
  flex: none;
}

.wm__route {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column-reverse;
  align-items: stretch;
  gap: 0.35rem;
}

.wm__link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: wm-link-in 0.35s ease-out both;
}

@keyframes wm-link-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.wm__link-connector {
  flex: none;
  width: 1.25rem;
  text-align: center;
  color: var(--wm-accent);
}

.wm__link-word {
  flex: 1 1 auto;
  padding: 0.6rem 0.9rem;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--wm-accent-soft);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.wm__link--start .wm__link-word {
  background: rgba(124, 198, 254, 0.16);
  border-color: var(--wm-accent);
}

.wm__link--current .wm__link-word {
  background: rgba(124, 198, 254, 0.28);
  border-color: var(--wm-accent);
  box-shadow: 0 0 0 2px var(--wm-accent-soft);
}

/* Guess form + branch exploration */

.wm__guess-form {
  margin-top: 1rem;
  width: 100%;
  display: flex;
  gap: 0.5rem;
}

.wm__guess-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0.6rem 0.8rem;
  border-radius: 0.5rem;
  border: 1px solid var(--wm-accent-soft);
  background: rgba(0, 0, 0, 0.25);
  color: var(--wm-ice);
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.wm__guess-input:focus-visible {
  outline: 2px solid var(--wm-accent);
  outline-offset: 1px;
}

.wm__branches {
  margin-top: 0.85rem;
  width: 100%;
}

.wm__branches-label {
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--wm-ice-soft);
}

.wm__branch-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
}

/* Controls */

.wm__toolbar {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.wm__btn {
  padding: 0.55rem 1.1rem;
  border-radius: 0.6rem;
  border: 1px solid var(--wm-accent-soft);
  background: rgba(0, 0, 0, 0.25);
  color: var(--wm-ice);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.15s ease;
}

.wm__btn:hover:not(:disabled),
.wm__btn:focus-visible:not(:disabled) {
  background: var(--wm-accent-soft);
}

.wm__btn:active:not(:disabled) {
  transform: translateY(1px);
}

.wm__btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.wm__btn--primary {
  background: var(--wm-accent);
  color: #0a1220;
  border-color: var(--wm-accent);
}

.wm__btn--primary:hover:not(:disabled),
.wm__btn--primary:focus-visible:not(:disabled) {
  background: #a4d8ff;
}

.wm__btn--small {
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
}

/* End-game reveal */

.wm__endgame {
  margin-top: 1.5rem;
  width: 100%;
  padding: 1.25rem;
  background: rgba(255, 215, 107, 0.08);
  border: 1px solid var(--wm-summit);
  border-radius: 0.9rem;
  text-align: left;
}

.wm__endgame-title {
  margin: 0;
  color: var(--wm-summit);
  font-size: 1.25rem;
  text-align: center;
}

.wm__endgame-stats {
  margin: 0.9rem 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  font-size: 0.875rem;
  color: var(--wm-ice-soft);
}

.wm__endgame-stats strong {
  display: block;
  color: var(--wm-ice);
  font-size: 1.25rem;
}

.wm__reveal {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.wm__reveal-col h3 {
  margin: 0 0 0.4rem;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--wm-ice-soft);
}

.wm__reveal-route {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.875rem;
}

.wm__reveal-step {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.4rem 0.5rem;
  border-radius: 0.4rem;
  background: rgba(255, 255, 255, 0.05);
}

.wm__reveal-word {
  font-weight: 700;
  letter-spacing: 0.08em;
}

.wm__reveal-branches {
  font-size: 0.75rem;
  color: var(--wm-ice-soft);
}

/* Streak / stats summary */

.wm__streaks {
  margin-top: 1.25rem;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.wm__streak-card {
  padding: 0.65rem 0.4rem;
  border-radius: 0.6rem;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--wm-accent-soft);
}

.wm__streak-value {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--wm-accent);
}

.wm__streak-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--wm-ice-soft);
}

.wm__hint {
  margin: 1rem 0 0;
  max-width: 32rem;
  color: var(--wm-ice-soft);
  font-size: 0.8125rem;
  line-height: 1.6;
}

.wm__sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.wm__footer {
  width: 100%;
  margin-top: 1.75rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.875rem;
}

.wm__back-link {
  color: var(--wm-accent);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.wm__back-link:hover,
.wm__back-link:focus-visible {
  text-decoration: underline;
}

@media (max-width: 30rem) {
  .wm__reveal {
    grid-template-columns: 1fr;
  }

  .wm__streaks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 26rem) {
  .wm__footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .wm,
  .wm__link {
    animation: none;
  }
}