/* ── Variables — paleta ROJA (Random Fighter / alumnos) ── */
:root {
  --red-deep:     #1A0404;
  --red-mid:      #7B1A1A;
  --red-accent:   #C0392B;
  --red-bright:   #E74C3C;
  --bg-black:     #08050505;
  --bg-surface:   #120808;
  --bg-card:      #1A0C0C;
  --text-primary: #F5ECEC;
  --text-muted:   #B09090;
  --text-dim:     #6A4848;
  --border-sub:   rgba(255,255,255,0.06);
  --border-acc:   rgba(192,57,43,0.4);
  --sidebar-w:    260px;
  --topbar-h:     56px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: #080505;
  color: var(--text-primary);
  font-family: 'DM Sans', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
}

/* ══════════════════════════════════════
   MOBILE TOPBAR
══════════════════════════════════════ */
.topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-sub);
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  z-index: 200;
}

.topbar-brand {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--red-bright);
}

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
  border-radius: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ══════════════════════════════════════
   OVERLAY
══════════════════════════════════════ */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 150;
  opacity: 0;
  transition: opacity 0.25s;
}

.overlay.active { opacity: 1; }

/* ══════════════════════════════════════
   LAYOUT SHELL
══════════════════════════════════════ */
.shell {
  display: flex;
  min-height: 100vh;
}

/* ══════════════════════════════════════
   SIDEBAR
══════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-surface);
  border-right: 1px solid var(--border-sub);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 2.5rem 0 2rem;
  z-index: 100;
}

.sidebar-brand {
  padding: 0 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border-sub);
  margin-bottom: 1.5rem;
}

.sidebar-eyebrow {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

.sidebar-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 22px;
  letter-spacing: 0.05em;
  color: var(--red-bright);
  line-height: 1;
}

.sidebar-nav-label {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 1.5rem;
  margin-bottom: 0.5rem;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 0.75rem;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.55rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  border: none;
  background: none;
  text-align: left;
  width: 100%;
  color: var(--text-muted);
  font-size: 13px;
  font-family: 'DM Sans', sans-serif;
  transition: background 0.15s, color 0.15s;
}

.nav-item:hover {
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(192,57,43,0.15);
  color: var(--text-primary);
}

.nav-item.active .nav-num { color: var(--red-bright); }

.nav-num {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 16px;
  color: var(--red-mid);
  min-width: 22px;
  line-height: 1;
}

.sidebar-footer {
  margin-top: 1.5rem;
  padding: 1.25rem 1.5rem 0;
  border-top: 1px solid var(--border-sub);
}

.sidebar-footer p {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.6;
}

.sidebar-footer span { color: var(--red-mid); }

/* ══════════════════════════════════════
   MAIN CONTENT
══════════════════════════════════════ */
.main {
  flex: 1;
  min-width: 0;
  padding: 3rem 4rem 6rem;
  max-width: 1240px;
}

/* ── Doc Header ── */
.doc-header {
  margin-bottom: 3.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-sub);
  position: relative;
}

.doc-header::before {
  content: '';
  position: absolute;
  left: -4rem;
  top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--red-bright), transparent);
}

.doc-eyebrow {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--red-accent);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.doc-eyebrow::before {
  content: '';
  display: inline-block;
  width: 18px; height: 1px;
  background: var(--red-accent);
}

.doc-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 52px;
  letter-spacing: 0.04em;
  line-height: 1;
  margin-bottom: 1.25rem;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
  font-size: 12px;
  color: var(--text-dim);
}

.doc-meta strong { color: var(--text-muted); }

/* ── Sections ── */
.tc-section {
  margin-bottom: 3rem;
  scroll-margin-top: 1.5rem;
}

.section-header {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.section-num {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 48px;
  color: var(--red-deep);
  line-height: 1;
  min-width: 48px;
  user-select: none;
}

.section-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 4px;
}

.section-tag {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.section-body {
  padding-left: 4.5rem;
}

.section-body p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.section-body p:last-child { margin-bottom: 0; }

.section-divider {
  height: 1px;
  background: var(--border-sub);
  margin-bottom: 3rem;
}

/* ── Alert block ── */
.alert {
  border-left: 2px solid var(--red-accent);
  background: rgba(192,57,43,0.08);
  padding: 0.9rem 1.1rem;
  border-radius: 0 6px 6px 0;
  margin-bottom: 1rem;
}

.alert p {
  font-size: 13px;
  color: var(--text-primary) !important;
  margin: 0 !important;
}

.alert strong { color: var(--red-bright); font-weight: 500; }

/* ── Accept bar ── */
.accept-bar {
  position: sticky;
  bottom: 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-acc);
  padding: 1rem 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  z-index: 50;
}

.accept-bar p {
  font-size: 12px;
  color: var(--text-dim);
  max-width: 460px;
  line-height: 1.5;
}

.accept-bar p strong { color: var(--text-muted); }

.btn-group { display: flex; gap: 0.75rem; align-items: center; }

.btn-accept {
  background: var(--red-accent);
  color: #fff;
  border: none;
  padding: 0.65rem 1.75rem;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 16px;
  letter-spacing: 0.1em;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}

.btn-accept:hover { background: var(--red-bright); }

.btn-decline {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border-sub);
  padding: 0.65rem 1.1rem;
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s;
}

.btn-decline:hover { color: var(--text-muted); }

/* ══════════════════════════════════════
   RESPONSIVE — TABLET (≤900px)
══════════════════════════════════════ */
@media (max-width: 900px) {
  .main { padding: 2.5rem 2.5rem 6rem; }
  .accept-bar { padding: 1rem 2.5rem; }
  .doc-header::before { left: -2.5rem; }
}

/* ══════════════════════════════════════
   RESPONSIVE — MOBILE (≤680px)
══════════════════════════════════════ */
@media (max-width: 680px) {
  .topbar { display: flex; }
  .overlay { display: block; }

  .sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    height: calc(100vh - var(--topbar-h));
    transform: translateX(-100%);
    transition: transform 0.28s cubic-bezier(.4,0,.2,1);
    z-index: 160;
    padding-top: 1.5rem;
    box-shadow: 4px 0 24px rgba(0,0,0,0.5);
  }

  .sidebar.open { transform: translateX(0); }
  .sidebar .sidebar-brand { display: none; }

  .main {
    padding: var(--topbar-h) 1.25rem 1.5rem;
    margin-top: 0;
    max-width: 100%;
  }

  .doc-header {
    margin-top: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
  }

  .doc-header::before { display: none; }
  .doc-title { font-size: 36px; }
  .doc-meta { flex-direction: column; gap: 0.4rem; }
  .section-num { font-size: 36px; min-width: 36px; }
  .section-body { padding-left: 3rem; }
  .tc-section { scroll-margin-top: calc(var(--topbar-h) + 1rem); }

  .accept-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem;
    gap: 0.75rem;
  }

  .accept-bar p { max-width: 100%; font-size: 11px; }
  .btn-group { flex-direction: column-reverse; }

  .btn-accept, .btn-decline {
    width: 100%;
    text-align: center;
    padding: 0.75rem;
  }

  .btn-accept { font-size: 18px; }
}