/* ══════════════════════════════════════════════════
   Primera Presentación de Proyecto — ILM 7mo Informática 2026
   Caso: Ferretería El Tornillo (Roberto)
   style.css — estilos completos de la presentación
══════════════════════════════════════════════════ */

/* ── VARIABLES ── */
:root {
  --ink: #0d1117;
  --ink2: #3a4150;
  --ink3: #6b7280;
  --bg: #f8f7f4;
  --bg2: #edeae4;
  --card: #ffffff;
  --border: rgba(13,17,23,0.1);
  --border2: rgba(13,17,23,0.05);
  --accent: #1a3a5c;
  --accent2: #2d6a4f;
  --warm: #c45e1a;
  --teal: #0d9488;
  --amber: #d97706;
  --red: #dc2626;
  --slide-bg: #0d1117;
  --slide-accent: #5dcaa5;
  --slide-accent2: #3b82f6;
  --slide-warm: #fb923c;
  --slide-text: #e8eaf0;
  --slide-sub: #9ca3af;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
strong, b { font-weight: 500; }
html { font-size: 16px; height: 100%; }
body {
  font-family: 'Lora', Georgia, serif;
  background: var(--slide-bg);
  color: var(--slide-text);
  height: 100vh;
  overflow: hidden;
  user-select: none;
  display: flex;
  flex-direction: column;
}

/* ── STAGE ── */
#stage {
  width: 100%;
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

/* ── SLIDE BASE ── */
.slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 3rem 4rem;
  opacity: 0;
  transform: translateX(60px);
  transition: opacity 0.45s cubic-bezier(0.4,0,0.2,1), transform 0.45s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none;
  overflow: hidden;
}
.slide.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: all;
  overflow: visible;
}
.slide.exit {
  opacity: 0;
  transform: translateX(-60px);
}

/* Subtle grid background */
.slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(93,202,165,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93,202,165,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* ── COVER SLIDE ── */
.slide-cover {
  background: var(--slide-bg);
  align-items: flex-start;
  justify-content: center;
}
.cover-glow {
  position: absolute;
  top: -180px; left: -180px;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(93,202,165,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.cover-glow2 {
  position: absolute;
  bottom: -120px; right: -120px;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, transparent 70%);
  pointer-events: none;
}
.cover-kicker {
  font-family: 'DM Sans', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slide-accent);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.cover-kicker::before {
  content: '';
  display: block;
  width: 28px; height: 2px;
  background: var(--slide-accent);
}
.cover-title {
  font-family: 'DM Sans', sans-serif;
  font-weight: 900;
  font-size: clamp(2.8rem, 5.5vw, 5rem);
  line-height: 1.0;
  letter-spacing: -.02em;
  color: #fff;
  margin-bottom: 1rem;
  max-width: 760px;
}
.cover-title .hl { color: var(--slide-accent); }
.cover-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  color: var(--slide-sub);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}
.cover-divider {
  width: 60px; height: 2px;
  background: linear-gradient(90deg, var(--slide-accent), var(--slide-accent2));
  margin-bottom: 2rem;
}
.cover-meta {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.cover-meta-row {
  font-family: 'DM Sans', sans-serif;
  font-size: .88rem;
  color: var(--slide-sub);
  display: flex;
  align-items: center;
  gap: 10px;
}
.cover-meta-row strong { color: var(--slide-text); font-weight: 600; }
.cover-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--slide-accent);
  flex-shrink: 0;
}
.cover-team-table {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .3rem 1.2rem;
  margin-top: .5rem;
}
.cover-member-num {
  font-family: 'DM Mono', monospace;
  font-size: .84rem;
  color: var(--slide-accent);
  font-weight: 500;
}
.cover-member-name {
  font-family: 'DM Sans', sans-serif;
  font-size: .88rem;
  color: var(--slide-text);
  font-weight: 500;
}
.cover-bottom-bar {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--slide-accent), var(--slide-accent2), var(--slide-warm));
}
.cover-institute {
  position: absolute;
  bottom: 1.5rem; right: 4rem;
  font-family: 'DM Sans', sans-serif;
  font-size: .81rem;
  color: var(--slide-sub);
  letter-spacing: .05em;
}

/* ── CONTENT SLIDES ── */
.slide-content {
  background: var(--slide-bg);
  align-items: stretch;
  justify-content: flex-start;
  padding: 2rem 4rem 2rem;
}

/* Header row */
.slide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.6rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}
.slide-section-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slide-accent);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: .45rem;
}
.slide-section-label::before {
  content: '';
  display: block;
  width: 16px; height: 2px;
  background: var(--slide-accent);
}
.slide-h1 {
  font-family: 'DM Sans', sans-serif;
  font-weight: 800;
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  color: #fff;
  letter-spacing: -.01em;
  line-height: 1.1;
}
.slide-num-badge {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  font-weight: 500;
  color: var(--slide-sub);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: 3px 10px;
}

/* Slide body */
.slide-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 0;
  padding-right: .35rem;
  scroll-behavior: smooth;
}
.slide-body::-webkit-scrollbar { width: 4px; }
.slide-body::-webkit-scrollbar-track { background: transparent; }
.slide-body::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: 4px;
}
.slide-body::-webkit-scrollbar-thumb:hover {
  background: rgba(93,202,165,0.5);
}
.slide-body { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.15) transparent; }

/* ── COLUMNS ── */
.cols-2  { display: grid; grid-template-columns: 1fr 1fr;       gap: 1.2rem; }
.cols-3  { display: grid; grid-template-columns: 1fr 1fr 1fr;   gap: 1rem; }
.cols-12 { display: grid; grid-template-columns: 1fr 1.6fr;     gap: 1.4rem; }
.cols-21 { display: grid; grid-template-columns: 1.6fr 1fr;     gap: 1.4rem; }

/* ── CARDS ── */
.card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 10px;
  padding: 1.1rem 1.25rem;
}
.card-accent { border-color: rgba(93,202,165,0.25);  background: rgba(93,202,165,0.04); }
.card-blue   { border-color: rgba(59,130,246,0.25);  background: rgba(59,130,246,0.04); }
.card-warm   { border-color: rgba(251,146,60,0.25);  background: rgba(251,146,60,0.04); }
.card-red    { border-color: rgba(220,38,38,0.2);    background: rgba(220,38,38,0.04); }

.card-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slide-accent);
  margin-bottom: .5rem;
}
.card-label.blue { color: var(--slide-accent2); }
.card-label.warm { color: var(--slide-warm); }
.card-label.red  { color: #f87171; }

.card-title {
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: .92rem;
  color: #fff;
  margin-bottom: .4rem;
  line-height: 1.3;
}
.card-body {
  font-size: .9rem;
  color: var(--slide-sub);
  line-height: 1.6;
}
.card-body p { margin-bottom: .3rem; }
.card-body p:last-child { margin-bottom: 0; }

/* ── TAGS ── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: 'DM Sans', sans-serif;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
}
.tag-rf    { background: rgba(45,106,79,0.25);   color: #6ee7b7; border: 1px solid rgba(110,231,183,0.2); }
.tag-rnf   { background: rgba(59,130,246,0.2);   color: #93c5fd; border: 1px solid rgba(147,197,253,0.2); }
.tag-okr   { background: rgba(217,119,6,0.2);    color: #fcd34d; border: 1px solid rgba(252,211,77,0.2); }
.tag-alta  { background: rgba(220,38,38,0.2);    color: #fca5a5; border: 1px solid rgba(252,165,165,0.15); }
.tag-media { background: rgba(217,119,6,0.2);    color: #fcd34d; }
.tag-baja  { background: rgba(45,106,79,0.2);    color: #86efac; }
.tag-no    { background: rgba(156,163,175,0.15); color: #9ca3af; border: 1px solid rgba(156,163,175,0.2); }

/* ── SYMPTOM→CAUSE TABLE ── */
.impact-table { width: 100%; border-collapse: collapse; }
.impact-table th {
  font-family: 'DM Sans', sans-serif;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--slide-sub);
  text-align: left;
  padding: .4rem .75rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.impact-table td {
  font-size: .92rem;
  padding: .5rem .75rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: top;
  line-height: 1.5;
}
.impact-table tr:last-child td { border-bottom: none; }
.impact-table .col-symptom { color: #f87171; }
.impact-table .col-cause   { color: var(--slide-text); font-weight: 500; }
.impact-table .col-rf      { color: var(--slide-accent); font-family: 'DM Mono', monospace; font-size: .78rem; }

/* ── REQ LIST ── */
.req-list { display: flex; flex-direction: column; gap: .45rem; }
.req-item {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  padding: .5rem .75rem;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 6px;
}
.req-id {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  font-weight: 500;
  color: var(--slide-accent);
  min-width: 40px;
  margin-top: 2px;
}
.req-id.blue  { color: #93c5fd; }
.req-text     { font-size: .92rem; color: var(--slide-text); line-height: 1.45; flex: 1; }
.req-text small { display: block; color: var(--slide-sub); font-size: .83rem; margin-top: 1px; }
.req-prio     { flex-shrink: 0; margin-top: 2px; }

/* ── BASELINE GRID ── */
.baseline-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; }
.baseline-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 8px;
  padding: .75rem .9rem;
}
.baseline-card.highlight { border-color: rgba(93,202,165,0.3); }
.bc-label  { font-family: 'DM Sans', sans-serif; font-size: .7rem; color: var(--slide-sub); margin-bottom: .2rem; }
.bc-before { font-family: 'DM Sans', sans-serif; font-size: 1.1rem; font-weight: 700; color: #f87171; line-height: 1.2; }
.bc-after  { font-family: 'DM Sans', sans-serif; font-size: .78rem; color: var(--slide-accent); margin-top: .15rem; }
.bc-warn   { color: var(--slide-warm); font-size: .78rem; margin-top: .15rem; }

/* ── OKR CARDS ── */
.okr-group { margin-bottom: .75rem; }
.okr-obj {
  background: var(--accent);
  border-radius: 6px 6px 0 0;
  padding: .5rem .8rem;
}
.okr-obj-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  margin-bottom: 1px;
}
.okr-obj-text {
  font-family: 'DM Sans', sans-serif;
  font-size: .84rem;
  font-weight: 600;
  color: #fff;
}
.okr-krs {
  border: 1px solid rgba(255,255,255,0.07);
  border-top: none;
  border-radius: 0 0 6px 6px;
  overflow: hidden;
}
.okr-kr {
  display: flex;
  gap: .6rem;
  padding: .4rem .8rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: .84rem;
  align-items: flex-start;
}
.okr-kr:last-child { border-bottom: none; }
.okr-kr-label {
  font-family: 'DM Mono', monospace;
  font-size: .73rem;
  font-weight: 600;
  color: var(--slide-accent);
  min-width: 28px;
  margin-top: 2px;
}
.okr-kr-text { color: var(--slide-sub); flex: 1; line-height: 1.45; font-size: .8rem; }

/* ── TEAM CARDS ── */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .85rem; }
.team-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: .5rem;
}
.team-avatar {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'DM Sans', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}
.team-avatar.partner {
  background: linear-gradient(135deg, #374151, #4b5563);
  border: 2px dashed rgba(255,255,255,0.15);
}
.team-name      { font-family: 'DM Sans', sans-serif; font-weight: 700; font-size: .88rem; color: #fff; line-height: 1.2; }
.team-role      { font-family: 'DM Sans', sans-serif; font-size: .78rem; color: var(--slide-accent); font-weight: 600; letter-spacing: .03em; }
.team-role.blue { color: #93c5fd; }
.team-role.warm { color: var(--slide-warm); }
.team-specialty { font-size: .74rem; color: var(--slide-sub); line-height: 1.4; }

/* ── BUDGET / TECH ── */
.tech-section-title {
  font-family: 'DM Sans', sans-serif;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slide-sub);
  margin-bottom: .5rem;
  padding-bottom: .35rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.tech-list { display: flex; flex-direction: column; gap: .35rem; }
.tech-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .88rem;
  padding: .3rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.tech-item:last-child { border-bottom: none; }
.tech-name          { color: var(--slide-text); font-weight: 500; }
.tech-cost          { font-family: 'DM Mono', monospace; font-size: .78rem; color: var(--slide-accent); }
.tech-cost.free     { color: #6ee7b7; }
.tech-cost.paid     { color: var(--slide-warm); }

/* ── GANTT ── */
.gantt-wrap { overflow: hidden; }
.gantt-row {
  display: grid;
  grid-template-columns: 140px repeat(7, 1fr);
  gap: 3px;
  margin-bottom: 3px;
  align-items: center;
}
.gantt-label {
  font-family: 'DM Sans', sans-serif;
  font-size: .7rem;
  color: var(--slide-sub);
  font-weight: 500;
  padding-right: .5rem;
  line-height: 1.3;
}
.gantt-label strong { color: var(--slide-text); display: block; }
.gantt-header { grid-template-columns: 140px repeat(7, 1fr); margin-bottom: 6px; }
.gantt-month {
  font-family: 'DM Sans', sans-serif;
  font-size: .70rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--slide-sub);
  text-align: center;
}
.gantt-cell {
  height: 22px;
  border-radius: 3px;
  background: rgba(255,255,255,0.04);
}
.gantt-cell.active        { background: linear-gradient(90deg, var(--slide-accent),  rgba(93,202,165,0.6)); border-radius: 3px; }
.gantt-cell.active.blue   { background: linear-gradient(90deg, var(--slide-accent2), rgba(59,130,246,0.5)); }
.gantt-cell.active.warm   { background: linear-gradient(90deg, var(--slide-warm),    rgba(251,146,60,0.5)); }
.gantt-cell.active.purple { background: linear-gradient(90deg, #8b5cf6, rgba(139,92,246,0.5)); }
.gantt-cell.active.red    { background: linear-gradient(90deg, #ef4444, rgba(239,68,68,0.5)); }
.gantt-cell.expo {
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
  animation: pulse-expo 1.5s ease-in-out infinite;
}
@keyframes pulse-expo {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.7; }
}

/* ── SCOPE TABLE ── */
.scope-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.scope-col-title {
  font-family: 'DM Sans', sans-serif;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: .6rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.scope-col-title.yes { color: var(--slide-accent); }
.scope-col-title.no  { color: #f87171; }
.scope-item {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  font-size: .92rem;
  color: var(--slide-sub);
  padding: .3rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  line-height: 1.4;
}
.scope-item:last-child { border-bottom: none; }
.scope-dot      { font-size: .7rem; margin-top: 2px; flex-shrink: 0; }
.scope-dot.yes  { color: var(--slide-accent); }
.scope-dot.no   { color: #f87171; }

/* ── PROFILE CARDS ── */
.profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.profile-card {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 10px;
  overflow: hidden;
}
.profile-header {
  padding: .9rem 1.1rem;
  display: flex;
  align-items: center;
  gap: .85rem;
}
.profile-header.dono     { background: rgba(26,58,92,0.8);    border-bottom: 1px solid rgba(93,202,165,0.2); }
.profile-header.empleado { background: rgba(255,255,255,0.04); border-bottom: 1px solid rgba(255,255,255,0.06); }
.profile-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'DM Sans', sans-serif;
  font-weight: 800;
  font-size: .9rem;
  flex-shrink: 0;
}
.dono     .profile-avatar { background: rgba(93,202,165,0.2); color: var(--slide-accent); }
.empleado .profile-avatar { background: rgba(255,255,255,0.1); color: var(--slide-sub); }
.profile-name { font-family: 'DM Sans', sans-serif; font-weight: 700; font-size: .88rem; color: #fff; }
.profile-role { font-family: 'DM Sans', sans-serif; font-size: .7rem; color: var(--slide-sub); margin-top: 2px; }
.profile-body { padding: .75rem 1.1rem; }
.profile-row {
  display: flex;
  gap: .5rem;
  padding: .25rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: .80rem;
}
.profile-row:last-child { border-bottom: none; }
.profile-k         { min-width: 110px; color: var(--slide-sub); }
.profile-v         { color: var(--slide-text); font-weight: 500; }
.profile-v.warn    { color: var(--slide-warm); }
.profile-v.ok      { color: var(--slide-accent); }
.profile-v.pending { color: var(--slide-sub); font-style: italic; }

/* ── BIG STAT ── */
.stat-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem;
}
.stat-num         { font-family: 'DM Sans', sans-serif; font-weight: 900; font-size: 2.4rem; color: #f87171; line-height: 1; letter-spacing: -.02em; }
.stat-num.green   { color: var(--slide-accent); }
.stat-label       { font-family: 'DM Sans', sans-serif; font-size: .78rem; color: var(--slide-sub); margin-top: .3rem; line-height: 1.4; }

/* ── HCI CHIPS ── */
.hci-list { display: flex; flex-direction: column; gap: .4rem; }
.hci-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .45rem .75rem;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 6px;
  font-size: .90rem;
  line-height: 1.4;
}
.hci-icon { font-size: .9rem; flex-shrink: 0; }
.hci-text { color: var(--slide-sub); flex: 1; }
.hci-text strong { color: var(--slide-text); font-weight: 500; }
.hci-implication {
  font-family: 'DM Mono', monospace;
  font-size: .70rem;
  color: var(--slide-accent);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── NOTE BOX ── */
.note {
  background: rgba(251,146,60,0.08);
  border: 1px solid rgba(251,146,60,0.2);
  border-radius: 6px;
  padding: .6rem .9rem;
  font-family: 'DM Sans', sans-serif;
  font-size: .84rem;
  color: rgba(251,146,60,0.9);
  line-height: 1.5;
}
.note.info    { background: rgba(59,130,246,0.07); border-color: rgba(59,130,246,0.2);  color: #93c5fd; }
.note.success { background: rgba(93,202,165,0.07); border-color: rgba(93,202,165,0.2);  color: #6ee7b7; }

/* ── SECTION INTRO ── */
.section-intro {
  font-size: .92rem;
  color: var(--slide-sub);
  line-height: 1.7;
  margin-bottom: .75rem;
  font-style: italic;
}

/* ── NAVIGATION FOOTER ── */
#footer-wrap {
  width: 100%;
  flex-shrink: 0;
  background: rgba(5,8,12,0.97);
  border-top: 1px solid rgba(255,255,255,0.07);
  z-index: 100;
}
#nav {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: .8rem 2rem .65rem;
}
#footer-teacher {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  padding: .55rem 2rem .65rem;
  border-top: 1px solid rgba(255,255,255,0.04);
}
.footer-teacher-label {
  font-family: 'DM Sans', sans-serif;
  font-size: .74rem;
  color: rgba(255,255,255,0.3);
  letter-spacing: .04em;
}
.footer-li-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: 'DM Sans', sans-serif;
  font-size: .70rem;
  font-weight: 600;
  color: rgba(255,255,255,0.35);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 4px;
  padding: 2px 8px;
  text-decoration: none;
  transition: all .2s;
}
.footer-li-btn:hover { background: #0077b5; color: #fff; border-color: #0077b5; }
.nav-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: .81rem;
  font-weight: 600;
  color: var(--slide-sub);
  background: none;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 100px;
  padding: .4rem .9rem;
  cursor: pointer;
  transition: all .2s;
  display: flex;
  align-items: center;
  gap: 5px;
}
.nav-btn:hover    { background: rgba(255,255,255,0.07); color: #fff; }
.nav-btn:disabled { opacity: .3; cursor: not-allowed; }
.nav-progress {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  color: var(--slide-sub);
  min-width: 48px;
  text-align: center;
}
.nav-dots { display: flex; align-items: center; gap: 5px; }
.nav-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  cursor: pointer;
  transition: all .25s;
}
.nav-dot.active { background: var(--slide-accent); width: 16px; border-radius: 3px; }

/* ── KEYBOARD HINT ── */
#kbd-hint {
  position: fixed;
  top: 1rem;
  right: 1.5rem;
  font-family: 'DM Sans', sans-serif;
  font-size: .70rem;
  color: rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 100;
}
kbd {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: 'DM Mono', monospace;
  font-size: .67rem;
}

/* ── PROGRESS BAR ── */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--slide-accent), var(--slide-accent2));
  transition: width .4s cubic-bezier(0.4,0,0.2,1);
  z-index: 200;
}