/* ��═══════════════���══════════════════════════════
   UMBLE LEARN — Shared Components
   ═══════════════════════════════════════════════ */

/* ── NAV ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 48px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(8,14,19,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--fog-10);
  transition: background 0.3s;
}

.wordmark {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.02em;
  color: var(--fog);
  line-height: 1;
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.wordmark .dot {
  color: var(--signal-blue);
  font-size: 30px;
  line-height: 0.85;
}

.wordmark-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--fog-40);
  text-transform: uppercase;
  margin-left: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--fog-20);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fog-60);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--fog); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #fff !important;
  background: var(--signal-blue);
  padding: 8px 20px;
  border-radius: 2px;
  text-transform: uppercase;
  transition: background 0.2s;
}

.nav-cta:hover { background: #0047B3; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--fog);
  margin: 4px 0;
  transition: all 0.3s;
}

/* ── SECTION ── */
.section {
  padding: var(--sp-3xl) 48px;
  border-top: 1px solid var(--fog-10);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--fog-40);
  text-transform: uppercase;
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--fog-10);
}

/* ── BUTTONS ── */
.btn-primary {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  background: var(--signal-blue);
  padding: 14px 32px;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.2s;
}

.btn-primary:hover { background: #0047B3; }

.btn-secondary {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fog-60);
  background: transparent;
  padding: 14px 32px;
  border: 1px solid var(--fog-20);
  border-radius: 2px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  color: var(--fog);
  border-color: var(--fog-40);
}

/* ── CARDS ── */
.card {
  background: var(--surface);
  border: 1px solid var(--fog-10);
  border-radius: 4px;
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}

.card:hover {
  border-color: var(--fog-20);
  transform: translateY(-2px);
}

.card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

/* Category card (for grid) */
.cat-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.cat-card-visual {
  height: 180px;
  background: var(--illus-bg);
  border-radius: 4px 4px 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.cat-card-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cat-card-visual .placeholder-icon {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 700;
  opacity: 0.15;
  color: var(--fog);
}

.cat-card-body {
  background: var(--surface);
  border: 1px solid var(--fog-10);
  border-top: none;
  border-radius: 0 0 4px 4px;
  padding: 20px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s;
}

.cat-card:hover .cat-card-body {
  border-color: var(--fog-20);
}

.cat-card-letter {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 500;
}

.cat-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--fog);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.cat-card-desc {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--fog-60);
  margin-bottom: 12px;
  flex: 1;
}

.cat-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--fog-10);
}

/* ── TAGS ── */
.tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.tag-blue { background: rgba(0,82,204,0.15); color: var(--electric); border: 1px solid rgba(0,82,204,0.3); }
.tag-green { background: rgba(0,200,150,0.12); color: var(--data-green); border: 1px solid rgba(0,200,150,0.25); }
.tag-amber { background: rgba(255,176,32,0.12); color: var(--amber); border: 1px solid rgba(255,176,32,0.25); }
.tag-violet { background: rgba(155,127,232,0.12); color: var(--violet); border: 1px solid rgba(155,127,232,0.25); }
.tag-neutral { background: transparent; color: var(--fog-40); border: 1px solid var(--fog-20); }

/* ── TICKER ── */
.ticker-bar {
  background: var(--signal-blue);
  padding: 10px 48px;
  display: flex;
  gap: 32px;
  align-items: center;
  overflow-x: auto;
}

.ticker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

.ticker-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.65);
  text-transform: uppercase;
}

.ticker-value {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: #fff;
}

.ticker-divider {
  width: 1px;
  height: 18px;
  background: rgba(255,255,255,0.2);
  flex-shrink: 0;
}

/* ── PROGRESS BAR ── */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--fog-10);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 2px;
  background: var(--cat-accent);
  transition: width 0.5s ease;
}

/* ── NOTE / CALLOUT ── */
.callout {
  padding: 20px 24px;
  background: rgba(0,82,204,0.06);
  border: 1px solid rgba(0,82,204,0.15);
  border-left: 3px solid var(--signal-blue);
  border-radius: 0 4px 4px 0;
}

.callout-title {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--electric);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.callout-text {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--fog-60);
}

.callout-text strong {
  color: var(--fog);
  font-weight: 500;
}

/* ── SERVICE/STEP CARD ── */
.step-card {
  background: var(--fog-06);
  border: 1px solid var(--fog-10);
  border-radius: 4px;
  padding: 32px 28px;
  transition: border-color 0.3s;
}

.step-card:hover { border-color: var(--fog-20); }

.step-icon {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--signal-blue);
  margin-bottom: 20px;
  display: block;
  line-height: 1;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--fog-40);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--fog);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.step-body {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--fog-60);
}

/* ── FOOTER ─�� */
.footer {
  padding: 32px 48px;
  border-top: 2px solid var(--signal-blue);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-wordmark {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--fog-40);
  text-decoration: none;
}

.footer-wordmark .dot { color: var(--signal-blue); }

.footer-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fog-40);
  letter-spacing: 0.1em;
  text-align: right;
}

/* ── LESSON CARD (on category page) ── */
.lesson-card {
  background: var(--surface);
  border: 1px solid var(--fog-10);
  border-radius: 4px;
  padding: 24px 28px 20px;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s, transform 0.3s;
}

.lesson-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cat-accent);
}

.lesson-card:hover {
  border-color: var(--fog-20);
  transform: translateY(-2px);
}

.lesson-card.locked {
  opacity: 0.5;
  pointer-events: none;
}

.lesson-num {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--fog-40);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.lesson-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--fog);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.lesson-desc {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.65;
  color: var(--fog-60);
  margin-bottom: 16px;
  flex: 1;
}

.lesson-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--fog-10);
}

.lesson-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--fog-20);
  margin-left: auto;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}

.lesson-check.done {
  background: var(--data-green);
  border-color: var(--data-green);
}

.lesson-check.done::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .nav { padding: 0 24px; }
  .section { padding: 64px 24px; }
  .footer { padding: 24px; }
  .ticker-bar { padding: 10px 24px; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(8,14,19,0.97);
    backdrop-filter: blur(20px);
    padding: 24px;
    border-bottom: 1px solid var(--fog-10);
    gap: 20px;
  }
}