/* Principles Guide page */

.guide-app {
  min-height: 100dvh;
}

.guide-page {
  position: relative;
  z-index: 2;
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.1rem 2rem;
}

.guide-header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.guide-title {
  font-size: clamp(2rem, 7vw, 2.75rem);
  font-weight: 900;
  line-height: 1.1;
  margin: 0.35rem 0 0.85rem;
  background: linear-gradient(180deg, #fff 0%, var(--lime) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.guide-intro {
  font-size: 0.95rem;
  color: var(--text-soft);
  line-height: 1.6;
  max-width: 52ch;
  margin: 0 auto 1rem;
}

.guide-intro a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.guide-back-btn {
  display: inline-flex;
  text-decoration: none;
}

/* Sticky jump navigation */
.principles-nav-wrap {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-bottom: 0.5rem;
  padding: 0.65rem 0 0.85rem;
}

.principles-nav-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(4, 69, 70, 0.58);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  -webkit-mask-image: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0, 0, 0, 0.35) 6%,
    #000 16%,
    #000 84%,
    rgba(0, 0, 0, 0.35) 94%,
    transparent 100%
  );
  mask-image: linear-gradient(
    90deg,
    transparent 0%,
    rgba(0, 0, 0, 0.35) 6%,
    #000 16%,
    #000 84%,
    rgba(0, 0, 0, 0.35) 94%,
    transparent 100%
  );
  pointer-events: none;
}

.principles-nav {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.1rem;
}

.nav-pill {
  flex: 0 1 auto;
  border: 1px solid var(--glass-border);
  background: rgba(6, 87, 88, 0.55);
  backdrop-filter: blur(10px);
  color: var(--text-soft);
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-align: center;
  transition: background 0.25s, color 0.25s, transform 0.2s;
  -webkit-tap-highlight-color: transparent;
  text-decoration: none;
}

.nav-pill:hover {
  color: var(--text);
  background: rgba(6, 87, 88, 0.75);
  transform: translateY(-1px);
}

/* Card grid */
.principles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.15rem;
}

.principle-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  scroll-margin-top: 7.5rem;
  animation: screenIn 0.45s var(--ease-out) both;
  transition:
    border-color 0.3s ease,
    box-shadow 0.3s ease,
    transform 0.25s var(--ease-out, ease);
}

.principle-card:hover,
.principle-card:focus-within,
.principle-card:target,
.principle-card.principle-card--active {
  border-color: rgba(196, 105, 96, 0.55);
  transform: translateY(-2px);
  animation: cardOuterShine 2.4s ease-in-out infinite;
}

@keyframes cardOuterShine {
  0%, 100% {
    border-color: rgba(196, 105, 96, 0.4);
    box-shadow:
      var(--shadow),
      0 0 0 1px rgba(196, 105, 96, 0.2),
      0 0 14px rgba(196, 105, 96, 0.28),
      0 0 22px rgba(196, 105, 96, 0.12);
  }
  50% {
    border-color: rgba(196, 105, 96, 0.75);
    box-shadow:
      var(--shadow),
      0 0 0 1px rgba(196, 105, 96, 0.5),
      0 0 22px rgba(196, 105, 96, 0.45),
      0 0 36px rgba(196, 105, 96, 0.28);
  }
}

.principle-card__accent {
  height: 5px;
  background: var(--card-accent, var(--lime));
}

.principle-card--coral { --card-accent: var(--coral); }
.principle-card--teal { --card-accent: var(--teal-mid); }
.principle-card--lime { --card-accent: var(--lime); }
.principle-card--light { --card-accent: var(--teal-light); }
.principle-card--gold { --card-accent: #ffd166; }
.principle-card--mint { --card-accent: #6dd4a8; }
.principle-card--rose { --card-accent: #e8927c; }
.principle-card--amber { --card-accent: #f0c04a; }
.principle-card--deep { --card-accent: #0a8a8c; }
.principle-card--sky { --card-accent: #8ec4e8; }

.principle-card__header {
  position: relative;
  z-index: 1;
  padding: 0.95rem 1rem 0.55rem;
}

.principle-card__category {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-soft);
  margin-bottom: 0.45rem;
}

.principle-card__label {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal-dark);
  background: var(--card-accent, var(--lime));
  padding: 0.22rem 0.55rem;
  border-radius: var(--radius-pill);
  margin-bottom: 0.45rem;
}

.principle-card__name {
  display: block;
  width: 100%;
  font-size: clamp(1.05rem, 3vw, 1.3rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--text);
  padding: 0;
  background: none;
  border: none;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.principle-card__name:hover {
  color: var(--lime);
}

.principle-card__name:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 6px;
}

.principle-card__hint {
  font-size: 0.72rem;
  color: var(--text-soft);
  margin-top: 0.35rem;
  opacity: 0.85;
}

.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 8px 22px rgba(4, 69, 70, 0.35);
  background: rgba(6, 87, 88, 0.55);
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.principle-card__body {
  position: relative;
  z-index: 1;
  padding: 0.85rem 1rem 1.1rem;
}

.principle-card__desc {
  font-size: 0.88rem;
  line-height: 1.62;
  color: var(--text-soft);
}

.guide-footer {
  margin-top: 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.guide-footer .tool-btn {
  text-decoration: none;
  display: inline-flex;
}

a.tool-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}

@media (min-width: 640px) {
  .principles-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

@media (min-width: 960px) {
  .guide-page {
    padding: 1.5rem 1.75rem 2.5rem;
  }

  .principles-grid {
    gap: 1.35rem;
  }
}

/* Video modal */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.video-modal[hidden] {
  display: none;
}

.video-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 38, 39, 0.82);
  backdrop-filter: blur(8px);
  animation: modalFadeIn 0.25s ease;
}

.video-modal__panel {
  position: relative;
  width: min(920px, 100%);
  background: linear-gradient(165deg, #044546 0%, #022628 55%, #011819 100%);
  border: 2px solid rgba(130, 195, 197, 0.5);
  border-radius: var(--radius-lg);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(226, 240, 63, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  overflow: hidden;
  animation: modalSlideIn 0.3s var(--ease-out, cubic-bezier(0.22, 1, 0.36, 1));
}

.video-modal__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1rem 0.75rem;
  background: rgba(1, 24, 25, 0.55);
  border-bottom: 1px solid rgba(130, 195, 197, 0.25);
}

.video-modal__title {
  font-size: clamp(1.05rem, 3.5vw, 1.35rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}

.video-modal__close {
  flex: 0 0 auto;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid rgba(130, 195, 197, 0.4);
  border-radius: 50%;
  background: rgba(6, 87, 88, 0.65);
  color: var(--text);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, border-color 0.2s;
}

.video-modal__close:hover {
  background: rgba(6, 87, 88, 0.9);
  border-color: rgba(226, 240, 63, 0.45);
  transform: scale(1.05);
}

.video-modal__body {
  padding: 1rem;
  background: rgba(1, 20, 21, 0.35);
}

.video-frame--modal {
  border-color: rgba(226, 240, 63, 0.45);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

body.modal-open {
  overflow: hidden;
}

.detail-modal__body {
  padding: 1rem 1.25rem 1.35rem;
}

.detail-modal__category {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--lime);
  margin-bottom: 0.75rem;
}

.detail-modal__desc {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-soft);
}

/* Scroll to top */
.scroll-top-btn {
  position: fixed;
  bottom: max(1rem, env(safe-area-inset-bottom, 0px));
  right: max(1rem, env(safe-area-inset-right, 0px));
  z-index: 50;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(130, 195, 197, 0.45);
  border-radius: 50%;
  background: linear-gradient(145deg, var(--lime), #b8cc28);
  color: var(--teal-dark);
  cursor: pointer;
  box-shadow: 0 6px 22px rgba(4, 69, 70, 0.4);
  opacity: 0;
  transform: translateY(14px) scale(0.9);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s var(--ease-bounce, cubic-bezier(0.34, 1.56, 0.64, 1));
}

.scroll-top-btn--visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.scroll-top-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 10px 28px rgba(4, 69, 70, 0.45);
}

.scroll-top-btn--visible:hover {
  transform: translateY(-2px) scale(1.05);
}

.scroll-top-btn:active {
  transform: scale(0.95);
}

@media (prefers-reduced-motion: reduce) {
  .scroll-top-btn {
    transition: opacity 0.15s ease;
  }

  .principle-card:hover,
  .principle-card:focus-within,
  .principle-card:target,
  .principle-card.principle-card--active {
    animation: none;
    border-color: rgba(196, 105, 96, 0.55);
    box-shadow:
      var(--shadow),
      0 0 0 1px rgba(196, 105, 96, 0.35),
      0 0 18px rgba(196, 105, 96, 0.35),
      0 0 28px rgba(196, 105, 96, 0.2);
  }
}