/* ================================================================
   12 — SEÇÕES ALTERNADAS
   ================================================================ */

/* ── Subtitles ── */
.sec-subtitle {
  font-family: var(--f-display);
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--text);
  margin: 48px 0 12px;
  letter-spacing: -0.02em;
}

.sec-explain {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 720px;
  margin: 0 0 24px;
}
.sec-explain code {
  font-family: var(--f-mono);
  font-size: 12px;
  background: var(--surface-2);
  padding: 2px 7px;
  border-radius: var(--r-xs);
  color: var(--accent-2);
}

/* ── Rhythm Diagram ── */
.sec-rhythm {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 48px;
  max-width: 600px;
}

.sec-rhythm__item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  transition: transform var(--t-fast);
}
.sec-rhythm__item:hover {
  transform: translateX(4px);
}

.sec-rhythm__bar {
  width: 6px;
  height: 36px;
  border-radius: 3px;
  flex-shrink: 0;
}

.sec-rhythm__item--transparent .sec-rhythm__bar {
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.12);
}
.sec-rhythm__item--transparent {
  background: rgba(255,255,255,0.02);
  border: 1px dashed rgba(255,255,255,0.08);
}

.sec-rhythm__item--opaque .sec-rhythm__bar {
  width: 6px;
}
.sec-rhythm__item--opaque {
  border: 1px solid rgba(255,255,255,0.08);
}

/* Opaque color variants for rhythm */
.sec-rhythm__item--teal {
  background: linear-gradient(135deg, rgba(0,229,204,0.06) 0%, rgba(0,229,204,0.02) 100%);
  border-color: rgba(0,229,204,0.15);
}
.sec-rhythm__item--teal .sec-rhythm__bar { background: #00E5CC; }

.sec-rhythm__item--purple {
  background: linear-gradient(135deg, rgba(153,69,255,0.06) 0%, rgba(153,69,255,0.02) 100%);
  border-color: rgba(153,69,255,0.15);
}
.sec-rhythm__item--purple .sec-rhythm__bar { background: #9945FF; }

.sec-rhythm__item--blue {
  background: linear-gradient(135deg, rgba(80,160,255,0.06) 0%, rgba(80,160,255,0.02) 100%);
  border-color: rgba(80,160,255,0.15);
}
.sec-rhythm__item--blue .sec-rhythm__bar { background: #50A0FF; }

.sec-rhythm__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sec-rhythm__type {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.sec-rhythm__detail {
  font-size: 12px;
  color: var(--text-3);
}

/* ── Section Demo Previews ── */
.sec-demo {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.sec-demo__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 40px 32px;
  max-width: 500px;
}

.sec-demo__label {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 12px;
}
.sec-demo__label--teal   { color: #00E5CC; }
.sec-demo__label--purple { color: #9945FF; }
.sec-demo__label--blue   { color: #50A0FF; }
.sec-demo__label--green  { color: #63D059; }
.sec-demo__label--amber  { color: #FFB801; }

.sec-demo__heading {
  font-family: var(--f-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
  color: #FBF9F4;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.sec-demo__text {
  font-family: var(--f-body);
  font-size: 14px;
  color: #ABABAB;
  line-height: 1.6;
  margin: 0;
}

/* ── Transparent Demo ── */
.sec-demo--transparent {
  background: #08080e;
}

.sec-demo__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

.sec-demo__blobs {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.sec-demo__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  will-change: transform;
}
.sec-demo__blob--1 {
  width: 40%;
  height: 80%;
  top: -10%;
  left: 5%;
  background: radial-gradient(circle, rgba(0,204,177,0.35) 0%, transparent 70%);
  animation: sec-float1 18s ease-in-out infinite;
}
.sec-demo__blob--2 {
  width: 35%;
  height: 70%;
  top: 20%;
  right: 5%;
  background: radial-gradient(circle, rgba(123,97,255,0.3) 0%, transparent 70%);
  animation: sec-float2 15s ease-in-out infinite;
}
.sec-demo__blob--3 {
  width: 30%;
  height: 60%;
  bottom: -5%;
  left: 30%;
  background: radial-gradient(circle, rgba(28,160,251,0.3) 0%, transparent 70%);
  animation: sec-float3 20s ease-in-out infinite;
}

@keyframes sec-float1 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(15px,-20px); } }
@keyframes sec-float2 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-12px,18px); } }
@keyframes sec-float3 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(10px,15px); } }

.sec-demo__noise {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ── Opaque Demos ── */
.sec-demo--opaque {
  border: none;
}

.sec-demo__opaque-effects {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.sec-demo__opaque-blob {
  position: absolute;
  width: 50%;
  height: 120%;
  top: -10%;
  left: 25%;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

/* V1 */
.sec-demo--v1 {
  background: linear-gradient(135deg, #041f1e 0%, #08080e 50%, #0a2a28 100%);
  border-top: 1px solid rgba(0,229,204,0.15);
  border-bottom: 1px solid rgba(0,229,204,0.15);
}
.sec-demo--v1 .sec-demo__opaque-blob {
  background: radial-gradient(circle, rgba(0,229,204,0.3), transparent 70%);
}

/* V2 */
.sec-demo--v2 {
  background: linear-gradient(135deg, #1a0a2e 0%, #08080e 50%, #1e0e35 100%);
  border-top: 1px solid rgba(153,69,255,0.15);
  border-bottom: 1px solid rgba(153,69,255,0.15);
}
.sec-demo--v2 .sec-demo__opaque-blob {
  background: radial-gradient(circle, rgba(153,69,255,0.3), transparent 70%);
}

/* V3 */
.sec-demo--v3 {
  background: linear-gradient(135deg, #060d1f 0%, #08080e 50%, #0a1230 100%);
  border-top: 1px solid rgba(80,160,255,0.15);
  border-bottom: 1px solid rgba(80,160,255,0.15);
}
.sec-demo--v3 .sec-demo__opaque-blob {
  background: radial-gradient(circle, rgba(80,160,255,0.25), transparent 70%);
}

/* V4 */
.sec-demo--v4 {
  background: linear-gradient(135deg, #071a0e 0%, #08080e 50%, #0a2012 100%);
  border-top: 1px solid rgba(99,208,89,0.15);
  border-bottom: 1px solid rgba(99,208,89,0.15);
}
.sec-demo--v4 .sec-demo__opaque-blob {
  background: radial-gradient(circle, rgba(99,208,89,0.25), transparent 70%);
}

/* V5 */
.sec-demo--v5 {
  background: linear-gradient(135deg, #1a1408 0%, #08080e 50%, #201a0a 100%);
  border-top: 1px solid rgba(255,184,1,0.15);
  border-bottom: 1px solid rgba(255,184,1,0.15);
}
.sec-demo--v5 .sec-demo__opaque-blob {
  background: radial-gradient(circle, rgba(255,184,1,0.2), transparent 70%);
}

/* ── Anatomy Diagram ── */
.sec-anatomy {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 48px;
  max-width: 700px;
}

.sec-anatomy__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  background: var(--g-1);
  backdrop-filter: var(--g-blur);
  border: 1px solid var(--g-border-dim);
  border-radius: var(--r-sm);
  opacity: 0;
  transform: translateY(10px);
  animation: sec-anatomy-in 0.5s ease forwards;
  animation-delay: calc(var(--layer-i, 0) * 0.1s);
}

@keyframes sec-anatomy-in {
  to { opacity: 1; transform: translateY(0); }
}

.sec-anatomy__num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sec-anatomy__body {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  flex: 1;
}

.sec-anatomy__icon {
  color: var(--text-3);
  flex-shrink: 0;
  margin-top: 2px;
}
.sec-anatomy__icon svg { width: 16px; height: 16px; }

.sec-anatomy__content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sec-anatomy__content strong {
  font-family: var(--f-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.sec-anatomy__content span {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.5;
}
.sec-anatomy__content code {
  font-family: var(--f-mono);
  font-size: 11px;
  background: var(--surface-2);
  padding: 1px 6px;
  border-radius: var(--r-xs);
  color: var(--accent-2);
}

/* ── Rules ── */
.sec-rules {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.sec-rule {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--r-sm);
}

.sec-rule--ok {
  background: var(--rule-ok-bg);
  border: 1px solid var(--rule-ok-border);
}
.sec-rule--ok .sec-rule__icon { color: var(--rule-ok-text); }

.sec-rule--no {
  background: var(--rule-no-bg);
  border: 1px solid var(--rule-no-border);
}
.sec-rule--no .sec-rule__icon { color: var(--rule-no-text); }

.sec-rule__icon {
  flex-shrink: 0;
  margin-top: 2px;
}
.sec-rule__icon svg { width: 18px; height: 18px; }

.sec-rule__content strong {
  display: block;
  font-family: var(--f-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.sec-rule__content p {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.6;
  margin: 0;
}
.sec-rule__content code {
  font-family: var(--f-mono);
  font-size: 11px;
  background: rgba(255,255,255,0.06);
  padding: 1px 5px;
  border-radius: var(--r-xs);
  color: var(--accent-2);
}

/* ── Reference Table ── */
.sec-ref-table {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  margin-bottom: 48px;
}

.sec-ref-table__header {
  display: grid;
  grid-template-columns: 180px 100px 1fr 1fr 1fr;
  padding: 12px 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sec-ref-table__row {
  display: grid;
  grid-template-columns: 180px 100px 1fr 1fr 1fr;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-2);
  align-items: center;
  transition: background var(--t-fast);
}
.sec-ref-table__row:last-child { border-bottom: none; }
.sec-ref-table__row:hover { background: rgba(255,255,255,0.02); }

.sec-ref-table__name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text);
}

.sec-ref-table__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sec-ref-table__row code {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--text-3);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sec-ref-table__header,
  .sec-ref-table__row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .sec-ref-table__header span:not(:first-child),
  .sec-ref-table__row span:not(:first-child) {
    padding-left: 18px;
  }
  .sec-ref-table__header {
    display: none;
  }
  .sec-ref-table__row {
    padding: 16px;
  }
  .sec-ref-table__name {
    font-size: 14px;
    margin-bottom: 4px;
  }

  .sec-rhythm {
    max-width: 100%;
  }
}

/* ── Light mode ── */
html[data-theme="light"] .sec-demo--transparent {
  background: #fdfcfa;
}
html[data-theme="light"] .sec-demo__grid {
  background-image:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
}
html[data-theme="light"] .sec-demo__blob--1 {
  background: radial-gradient(circle, rgba(0,88,212,0.08) 0%, transparent 70%);
}
html[data-theme="light"] .sec-demo__blob--2 {
  background: radial-gradient(circle, rgba(175,109,255,0.06) 0%, transparent 70%);
}
html[data-theme="light"] .sec-demo__blob--3 {
  background: radial-gradient(circle, rgba(99,208,89,0.05) 0%, transparent 70%);
}
html[data-theme="light"] .sec-demo__heading {
  color: var(--text);
}
html[data-theme="light"] .sec-demo__text {
  color: var(--text-2);
}
html[data-theme="light"] .sec-rhythm__item--transparent {
  background: rgba(0,0,0,0.02);
  border-color: rgba(0,0,0,0.08);
}
html[data-theme="light"] .sec-rhythm__item--transparent .sec-rhythm__bar {
  background: linear-gradient(180deg, rgba(0,0,0,0.06), rgba(0,0,0,0.02));
  border-color: rgba(0,0,0,0.12);
}