/* Page-owned styles for Beginner's Guide */

.bg-main {
  position: relative;
  overflow-x: hidden;
}

/* Vertical flow line */
.bg-flow-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(
    to bottom,
    #00B4D8 0%,
    #7B2CBF 20%,
    #FF6B6B 40%,
    #FFD166 60%,
    #06D6A0 80%,
    #3A0CA3 100%
  );
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
}

.bg-section {
  position: relative;
  z-index: 1;
  padding-block: var(--space-3xl);
}

/* Hero */
.bg-hero {
  position: relative;
  padding-block: var(--space-4xl) var(--space-3xl);
  overflow: hidden;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.bg-hero__inner {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
  position: relative;
  z-index: 1;
}

.bg-hero__text {
  max-width: 600px;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.bg-hero__text h1 {
  margin-block-end: 0;
}

.bg-hero__lead {
  max-width: 45ch;
  margin-block-end: 0;
}

.bg-hero__facts {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-width: 45ch;
}

.bg-hero__facts li {
  font-size: var(--text-body-small-size);
  line-height: var(--text-body-small-line-height);
  color: var(--color-ink-muted);
}

.bg-hero__cta {
  margin-block-start: var(--space-md);
}

.bg-hero__vessel {
  position: absolute;
  top: 0;
  right: 0;
  width: 60%;
  height: 100%;
  background: radial-gradient(circle at 70% 30%, rgba(0, 180, 216, 0.15), transparent 60%);
  z-index: 0;
  pointer-events: none;
}

/* Section grids */
.bg-section__grid {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: start;
}

.bg-section__text {
  min-width: 0;
}

.bg-section__text h2 {
  margin-block-end: var(--space-md);
}

.bg-section__text h3 {
  margin-block-start: var(--space-lg);
  margin-block-end: var(--space-sm);
}

.bg-section__text p {
  max-width: 60ch;
}

.bg-section__text .content-list {
  max-width: 60ch;
}

.bg-section__visual {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  justify-content: center;
}

/* Tubes sequence visual */
.bg-tubes-sequence {
  position: relative;
  min-height: 220px;
  width: 100%;
  max-width: 400px;
  margin-inline: auto;
  display: flex;
  flex-direction: row;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-md);
}

.bg-tube {
  width: 60px;
  height: 140px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  border: 2px solid var(--color-glass-border);
  background: linear-gradient(to bottom, var(--color-white-glass), rgba(255,255,255,0.2));
  position: relative;
  overflow: hidden;
}

.bg-tube--cyan::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 70%;
  background: linear-gradient(to top, #00B4D8, rgba(0, 180, 216, 0.6));
}

.bg-tube--violet::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to top, #7B2CBF, rgba(123, 44, 191, 0.6));
}

.bg-tube--empty {
  background: rgba(255,255,255,0.3);
}

.bg-pour-stream {
  position: absolute;
  top: 20px;
  left: 70px;
  width: 4px;
  height: 80px;
  background: linear-gradient(to bottom, #00B4D8, transparent);
  transform: rotate(25deg);
  transform-origin: top;
  opacity: 0.7;
}

/* Step cards */
.bg-section__single {
  width: 100%;
  max-width: 800px;
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
}

.bg-step-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
  margin-block-start: var(--space-lg);
}

.bg-step-card {
  background-color: var(--color-white-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glass), var(--shadow-glass-inset);
  padding: var(--space-lg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.bg-step-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 180, 216, 0.15), var(--shadow-glass-inset);
}

.bg-step-card__icon {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-cyan);
  margin-block-end: var(--space-sm);
}

.bg-step-card h3 {
  margin-block-end: var(--space-sm);
}

.bg-step-card p,
.bg-step-card .content-list {
  max-width: 60ch;
}

/* Tip box */
.bg-tip-box {
  background-color: rgba(255, 209, 102, 0.25);
  border-inline-start: 4px solid var(--color-yellow);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-md);
  margin-block: var(--space-md);
  max-width: 60ch;
}

.bg-tip-box p {
  margin-block-end: 0;
}

/* Strategy visual */
.bg-strategy-visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  justify-content: center;
}

.bg-mini-tube {
  width: 80px;
  height: 120px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  border: 2px solid var(--color-glass-border);
  background: rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}

.bg-mini-tube--mixed::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, #FF6B6B 0%, #FF6B6B 33%, #7B2CBF 33%, #7B2CBF 66%, #00B4D8 66%, #00B4D8 100%);
}

.bg-mini-tube--sorted::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, #00B4D8 0%, #00B4D8 50%, #7B2CBF 50%, #7B2CBF 100%);
}

.bg-mini-tube--complete::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: #06D6A0;
}

/* Mistakes callout */
.bg-mistakes-callout {
  background-color: rgba(255, 209, 102, 0.2);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 700px;
  margin-inline: auto;
  box-shadow: var(--shadow-glass);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.bg-mistakes-callout:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(255, 107, 107, 0.15);
}

.bg-mistakes-callout__icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-coral);
  margin-block-end: var(--space-md);
}

.bg-mistakes-callout h3 {
  margin-block-end: var(--space-sm);
}

.bg-mistakes-callout p,
.bg-mistakes-callout .content-list {
  max-width: 50ch;
}

/* Progress bar */
.bg-progress-bar {
  width: 100%;
  max-width: 600px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: rgba(30, 30, 42, 0.08);
  margin-block-start: var(--space-xl);
  overflow: hidden;
}

.bg-progress-bar__fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(to right, #FF6B6B, #FFD166, #06D6A0);
  border-radius: var(--radius-full);
  transition: width 0.3s ease-out;
}

/* Final section */
.bg-final {
  position: relative;
  padding-block: var(--space-3xl);
  overflow: hidden;
}

.bg-final__inner {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
  position: relative;
  z-index: 1;
}

.bg-final__text {
  max-width: 600px;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.bg-final__text h2 {
  margin-block-end: 0;
}

.bg-final__text h3 {
  margin-block-end: 0;
}

.bg-final__text p {
  max-width: 45ch;
}

.bg-final__text .content-list {
  max-width: 45ch;
  text-align: left;
}

.bg-final__cta {
  margin-block-start: var(--space-md);
}

.bg-final__vessel {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(circle at 70% 30%, rgba(6, 214, 160, 0.15), transparent 60%);
  z-index: 0;
  pointer-events: none;
}

/* Tablet and up */
@media (min-width: 768px) {
  .bg-hero__inner,
  .bg-section__grid,
  .bg-final__inner {
    padding-inline: var(--container-padding-desktop);
  }

  .bg-section__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: var(--space-2xl);
  }

  .bg-section__text {
    grid-column: 1;
  }

  .bg-section__visual {
    grid-column: 2;
  }

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

  .bg-final__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .bg-section__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

/* Mobile adjustments */
@media (max-width: 767px) {
  .bg-hero {
    min-height: auto;
    padding-block: var(--space-2xl) var(--space-2xl);
  }

  .bg-hero__vessel {
    width: 80%;
  }

  .bg-section {
    padding-block: var(--space-2xl);
  }

  .bg-final__vessel {
    width: 70%;
  }

  .bg-tube {
    width: 50px;
    height: 120px;
  }

  .bg-pour-stream {
    left: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg-flow-line,
  .bg-pour-stream {
    animation: none !important;
  }
}