/* ============================================================
   BREAK && BUILD — Shared Stylesheet
   ============================================================ */

/* ========== VARIABLES ========== */
:root {
  --red: #CC0000;
  --black: #0A0A0A;
  --cream: #E8DCC8;
  --yellow: #D4A017;
  --green-term: #33FF33;
  --amber: #FFB000;
  --dark-red: #8B0000;
  --concrete: #B8B0A0;
  --rust: #A0522D;
}

/* ========== RESET & BASE ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

::selection {
  background: var(--red);
  color: var(--cream);
}

html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--cream);
  font-family: 'Share Tech Mono', monospace;
  overflow-x: hidden;
  cursor: crosshair;
}

/* ========== SCANLINE OVERLAY ========== */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ========== NOISE TEXTURE ========== */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9998;
}

/* ========== TOP BAR ========== */
.top-bar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--black);
  border-bottom: 3px solid var(--red);
  z-index: 1000;
  font-size: 0.8rem;
}

.top-bar .logo {
  font-family: 'Rubik Mono One', monospace;
  font-size: 1rem;
  color: var(--red);
  letter-spacing: 2px;
  text-decoration: none;
}

.top-bar nav {
  display: flex;
  align-items: center;
}

.top-bar nav a {
  color: var(--cream);
  text-decoration: none;
  margin-left: 2rem;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 2px;
  transition: color 0.2s;
  position: relative;
}

.top-bar nav a:hover {
  color: var(--red);
}

.top-bar nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--red);
  transition: width 0.3s;
}

.top-bar nav a:hover::after {
  width: 100%;
}

/* ========== SHARED SECTION LABEL ========== */
.section-label,
.block-label {
  font-family: 'VT323', monospace;
  font-size: 0.9rem;
  color: var(--green-term);
  text-transform: uppercase;
  letter-spacing: 6px;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-label::before,
.block-label::before {
  content: '>';
  color: var(--red);
  font-weight: bold;
}

.block-label {
  font-size: 0.85rem;
  gap: 0.8rem;
}

/* ========== ANIMATIONS ========== */
@keyframes fadeFlicker {
  0% { opacity: 0; }
  50% { opacity: 0.5; }
  70% { opacity: 0.3; }
  100% { opacity: 1; }
}

@keyframes glitchIn {
  0% { opacity: 0; transform: translate(-5px, 5px); }
  20% { opacity: 0.6; transform: translate(3px, -2px); }
  40% { opacity: 0.4; transform: translate(-2px, 0); }
  60% { opacity: 0.8; transform: translate(1px, 1px); }
  80% { opacity: 0.9; transform: translate(-1px, -1px); }
  100% { opacity: 1; transform: translate(0, 0); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.typing-cursor::after {
  content: '█';
  animation: blink 0.8s infinite;
  color: var(--green-term);
  margin-left: 2px;
}

/* ========== REVEAL ON SCROLL ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--red); }

/* ========== SHARED FOOTER ========== */
footer {
  padding: 3rem 2rem;
  border-top: 8px solid var(--red);
  text-align: center;
}

footer .footer-logo {
  font-family: 'Rubik Mono One', monospace;
  font-size: 1rem;
  color: var(--red);
  letter-spacing: 3px;
  margin-bottom: 1rem;
}

footer p {
  font-family: 'VT323', monospace;
  font-size: 0.9rem;
  color: var(--concrete);
}

footer .ascii-atom {
  font-family: 'VT323', monospace;
  font-size: 0.8rem;
  color: rgba(204,0,0,0.4);
  margin-top: 2rem;
  line-height: 1.2;
  white-space: pre;
}


/* ============================================================
   LANDING PAGE — index.html
   ============================================================ */

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  border-bottom: 8px solid var(--red);
  padding: 2rem;
  overflow: hidden;
}

.hero-bg-symbol {
  position: absolute;
  font-family: 'VT323', monospace;
  font-size: clamp(300px, 40vw, 600px);
  color: rgba(204, 0, 0, 0.06);
  user-select: none;
  pointer-events: none;
  line-height: 1;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.hero-pre {
  font-family: 'VT323', monospace;
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  color: var(--green-term);
  margin-bottom: 1.5rem;
  text-align: center;
  letter-spacing: 3px;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeFlicker 1s 0.3s forwards;
}

.hero h1 {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(3rem, 10vw, 9rem);
  color: var(--cream);
  text-align: center;
  line-height: 0.95;
  letter-spacing: -2px;
  position: relative;
  opacity: 0;
  animation: glitchIn 0.8s 0.6s forwards;
}

.hero h1 .amp {
  color: var(--red);
  display: inline-block;
}

.hero-sub {
  font-family: 'VT323', monospace;
  font-size: clamp(1rem, 2vw, 1.4rem);
  color: var(--amber);
  margin-top: 2rem;
  text-align: center;
  max-width: 700px;
  line-height: 1.6;
  opacity: 0;
  animation: fadeFlicker 1s 1s forwards;
}

.hero-badge {
  margin-top: 3rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  opacity: 0;
  animation: fadeFlicker 1s 1.3s forwards;
}

.hero-badge span {
  display: inline-block;
  border: 2px solid var(--red);
  padding: 0.5rem 1.2rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--red);
}

.hero-badge .picsart-tag {
  border-color: var(--cream);
  color: var(--cream);
}

.nav-enroll {
  background: var(--red) !important;
  color: var(--black) !important;
  padding: 0.4rem 1rem !important;
  font-weight: bold;
  letter-spacing: 0.1em;
  transition: all 0.3s;
}

.nav-enroll:hover {
  background: transparent !important;
  color: var(--red) !important;
  outline: 2px solid var(--red);
}

.cta-bar {
  text-align: center;
  padding: 3rem 2rem;
}

.enroll-btn {
  display: inline-block;
  margin-top: 2rem;
  padding: 1rem 3rem;
  font-family: 'Rubik Mono One', monospace;
  font-size: 1.2rem;
  color: var(--black);
  background: var(--red);
  text-decoration: none;
  letter-spacing: 0.15em;
  border: 2px solid var(--red);
  transition: all 0.3s;
  cursor: pointer;
}

.enroll-btn:hover {
  background: transparent;
  color: var(--red);
  box-shadow: 0 0 20px rgba(204, 0, 0, 0.5);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  font-family: 'VT323', monospace;
  font-size: 1.2rem;
  color: var(--green-term);
  animation: blink 1.5s infinite;
  letter-spacing: 2px;
}

/* ========== MANIFESTO ========== */
.manifesto {
  padding: 6rem 2rem;
  border-bottom: 8px solid var(--red);
  position: relative;
  overflow: hidden;
}

.manifesto::before {
  content: '//';
  position: absolute;
  top: -40px;
  right: 2rem;
  font-family: 'Rubik Mono One', monospace;
  font-size: 200px;
  color: rgba(204, 0, 0, 0.05);
  pointer-events: none;
}

.manifesto-inner {
  max-width: 900px;
  margin: 0 auto;
}

.manifesto-text {
  font-family: 'VT323', monospace;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  line-height: 1.8;
  color: var(--cream);
}

.manifesto-text .highlight {
  color: var(--red);
  text-decoration: line-through;
  text-decoration-color: var(--yellow);
}

.manifesto-text .correction {
  color: var(--green-term);
  font-weight: bold;
}

/* ========== PIXELCRAFT SECTION ========== */
.pixelcraft-section {
  padding: 6rem 2rem;
  background: linear-gradient(180deg, rgba(139,0,0,0.15) 0%, var(--black) 100%);
  border-bottom: 8px solid var(--red);
  position: relative;
}

.pixelcraft-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.pixelcraft-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  margin-bottom: 4rem;
}

.pixelcraft-title {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--cream);
  line-height: 1.1;
}

.pixelcraft-title small {
  display: block;
  font-family: 'VT323', monospace;
  font-size: 1rem;
  color: var(--amber);
  letter-spacing: 4px;
  margin-bottom: 0.5rem;
  font-weight: normal;
}

.pixelcraft-desc {
  font-family: 'VT323', monospace;
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--concrete);
  border-left: 4px solid var(--red);
  padding-left: 1.5rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2px;
}

.feature-card {
  border: 2px solid rgba(204, 0, 0, 0.3);
  padding: 2rem;
  position: relative;
  transition: all 0.3s;
  background: rgba(10, 10, 10, 0.8);
}

.feature-card:hover {
  border-color: var(--red);
  background: rgba(139, 0, 0, 0.1);
}

.feature-card::before {
  content: attr(data-index);
  position: absolute;
  top: 0.5rem;
  right: 0.8rem;
  font-family: 'Rubik Mono One', monospace;
  font-size: 2.5rem;
  color: rgba(204, 0, 0, 0.1);
}

.feature-card h3 {
  font-family: 'Rubik Mono One', monospace;
  font-size: 0.85rem;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

.feature-card p {
  font-family: 'VT323', monospace;
  font-size: 1.05rem;
  color: var(--concrete);
  line-height: 1.6;
}

/* ========== LEVELS / SESSIONS (TAB UI) ========== */
.levels {
  padding: 6rem 2rem;
  border-bottom: 8px solid var(--red);
}

.levels-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.level-stats {
  display: flex;
  gap: 2rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.level-stat {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  color: var(--concrete);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.level-stat strong {
  font-family: 'Rubik Mono One', monospace;
  font-size: 1.4rem;
  color: var(--red);
}

/* --- Tab bar --- */
.level-tabs {
  display: flex;
  gap: 0;
  border-bottom: 3px solid var(--red);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.level-tabs::-webkit-scrollbar {
  display: none;
}

.level-tab {
  flex-shrink: 0;
  padding: 1.2rem 1.6rem;
  cursor: pointer;
  user-select: none;
  border: 2px solid transparent;
  border-bottom: none;
  position: relative;
  transition: all 0.25s;
  text-align: center;
  background: transparent;
}

.level-tab:hover {
  background: rgba(204, 0, 0, 0.06);
}

.level-tab-num {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(0.9rem, 1.8vw, 1.2rem);
  color: var(--concrete);
  display: block;
  transition: color 0.25s;
  opacity: 0.5;
}

.level-tab-name {
  font-family: 'VT323', monospace;
  font-size: 0.85rem;
  color: var(--concrete);
  margin-top: 0.25rem;
  letter-spacing: 1px;
  white-space: nowrap;
  transition: color 0.25s;
  opacity: 0.5;
}

.level-tab:hover .level-tab-num,
.level-tab:hover .level-tab-name {
  opacity: 0.8;
}

/* active tab */
.level-tab.active {
  border-color: var(--red);
  border-bottom: 3px solid var(--black);
  margin-bottom: -3px;
  background: rgba(204, 0, 0, 0.04);
}

.level-tab.active .level-tab-num {
  color: var(--red);
  opacity: 1;
}

.level-tab.active .level-tab-name {
  color: var(--cream);
  opacity: 1;
}

/* active indicator bar */
.level-tab.active::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--green-term);
}

/* --- Tab panel area --- */
.level-panels {
  position: relative;
}

.level-panel {
  display: none;
  border: 2px solid rgba(204, 0, 0, 0.2);
  border-top: none;
  position: relative;
  animation: panelFadeIn 0.3s ease;
}

.level-panel.active {
  display: block;
}

@keyframes panelFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.level-panel::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 6px;
  height: 100%;
  background: var(--red);
}

/* panel header with title + range */
.level-panel-header {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding: 2rem 2rem 1.5rem;
  margin-left: 6px;
  border-bottom: 1px solid rgba(204, 0, 0, 0.12);
}

.level-panel-number {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--red);
  line-height: 1;
  flex-shrink: 0;
}

.level-panel-info h3 {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(0.7rem, 1.3vw, 0.9rem);
  color: var(--cream);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.level-panel-info .level-range {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  color: var(--amber);
  margin-top: 0.3rem;
}

/* --- Sessions list --- */
.sessions-list {
  padding: 0 2rem 2rem 2rem;
  margin-left: 6px;
}

.session-item {
  border-top: 1px solid rgba(204, 0, 0, 0.12);
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.2rem;
  align-items: center;
  transition: background 0.2s;
}

.session-item:nth-child(odd) {
  background: rgba(204, 0, 0, 0.025);
}

.session-item:first-child {
  border-top: none;
}

.session-item:hover {
  background: rgba(204, 0, 0, 0.07);
}

.session-link {
  display: contents;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.session-num {
  font-family: 'Rubik Mono One', monospace;
  font-size: 0.85rem;
  color: var(--green-term);
  padding: 1.1rem 0;
  padding-left: 0.6rem;
  opacity: 0.7;
}

.session-info {
  padding: 1.1rem 0;
  padding-right: 1rem;
}

.session-title-text {
  font-family: 'VT323', monospace;
  font-size: 1.55rem;
  color: var(--cream);
  margin-bottom: 0.3rem;
  transition: color 0.2s;
  line-height: 1.3;
}

.session-link:hover .session-title-text {
  color: var(--red);
}

.session-topics {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--concrete);
  opacity: 0.7;
  line-height: 1.4;
}

/* review sessions */
.session-item.review {
  border-top: 2px solid rgba(212, 160, 23, 0.3);
  background: rgba(212, 160, 23, 0.03);
}

.session-item.review .session-num {
  color: var(--yellow);
}

.session-item.review .session-title-text {
  color: var(--yellow);
}

.session-item.review .session-link:hover .session-title-text {
  color: var(--amber);
}

/* ========== GRADUATION ========== */
.graduation {
  padding: 6rem 2rem;
  background: var(--red);
  color: var(--black);
  position: relative;
  overflow: hidden;
}

.graduation::before {
  content: '★';
  position: absolute;
  font-size: 400px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.08;
  pointer-events: none;
}

.graduation-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.graduation h2 {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--cream);
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: 3px;
}

.grad-signals {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  text-align: left;
  max-width: 500px;
  margin: 0 auto;
}

.grad-signal {
  font-family: 'VT323', monospace;
  font-size: 1.2rem;
  color: var(--cream);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.grad-signal::before {
  content: '[✓]';
  color: var(--black);
  font-weight: bold;
  flex-shrink: 0;
}

.grad-disclaimer {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
  color: var(--black);
  margin-top: 3rem;
  border-top: 3px solid var(--black);
  padding-top: 1.5rem;
  opacity: 0.8;
}


/* ============================================================
   SESSION PAGES — sessions/xxx.html
   ============================================================ */

/* ========== SESSION TOP BAR OVERRIDES ========== */
.top-bar .nav-sep {
  color: var(--concrete);
  opacity: 0.3;
  font-size: 0.7rem;
  margin-left: 0.5rem;
}

.top-bar .nav-current {
  color: var(--green-term);
  margin-left: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* session nav removes underline from breadcrumb links */
.top-bar nav.breadcrumb a::after {
  display: none;
}

.top-bar nav.breadcrumb a {
  margin-left: 0;
  margin-right: 0.5rem;
}

/* ========== SESSION HERO ========== */
.session-hero {
  padding: 8rem 2rem 4rem;
  border-bottom: 8px solid var(--red);
  position: relative;
  overflow: hidden;
  min-height: 50vh;
  display: flex;
  align-items: flex-end;
}

.session-hero-bg {
  position: absolute;
  top: 50%;
  right: -5%;
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(200px, 30vw, 450px);
  color: rgba(204, 0, 0, 0.04);
  line-height: 1;
  transform: translateY(-50%);
  user-select: none;
  pointer-events: none;
}

.session-hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 1;
  opacity: 0;
  animation: glitchIn 0.8s 0.2s forwards;
}

.session-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.session-badge {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  padding: 0.4rem 1rem;
  border: 2px solid;
}

.badge-level {
  border-color: var(--red);
  color: var(--red);
}

.badge-session {
  border-color: var(--green-term);
  color: var(--green-term);
}

.badge-day {
  border-color: var(--amber);
  color: var(--amber);
}

.session-title {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(2rem, 6vw, 4.5rem);
  color: var(--cream);
  line-height: 1.05;
  margin-bottom: 1rem;
  letter-spacing: -1px;
}

.session-title .title-accent {
  color: var(--red);
}

.session-nav-arrows {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.session-nav-arrows a {
  font-family: 'VT323', monospace;
  font-size: 1rem;
  color: var(--concrete);
  text-decoration: none;
  border: 1px solid rgba(204, 0, 0, 0.3);
  padding: 0.5rem 1.2rem;
  transition: all 0.2s;
  letter-spacing: 1px;
}

.session-nav-arrows a:hover {
  border-color: var(--red);
  color: var(--red);
  background: rgba(204, 0, 0, 0.05);
}

.session-nav-arrows a.disabled {
  opacity: 0.25;
  pointer-events: none;
}

/* ========== SCENARIO ========== */
.scenario {
  padding: 5rem 2rem;
  border-bottom: 4px solid rgba(204, 0, 0, 0.3);
  position: relative;
  background: linear-gradient(180deg, rgba(139,0,0,0.08) 0%, transparent 100%);
}

.scenario-inner {
  max-width: 900px;
  margin: 0 auto;
}

.scenario-text {
  font-family: 'VT323', monospace;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.8;
  color: var(--cream);
  border-left: 4px solid var(--amber);
  padding-left: 2rem;
  position: relative;
}

.scenario-text .scenario-icon {
  position: absolute;
  left: -1.6rem;
  top: -0.2rem;
  font-size: 1.4rem;
}

/* ========== CONCEPTS ========== */
.concepts {
  padding: 5rem 2rem;
  border-bottom: 4px solid rgba(204, 0, 0, 0.3);
}

.concepts-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2px;
  margin-top: 2rem;
}

.concept-card {
  border: 2px solid rgba(204, 0, 0, 0.2);
  padding: 2rem;
  background: rgba(10, 10, 10, 0.6);
  position: relative;
  transition: all 0.3s;
}

.concept-card:hover {
  border-color: var(--red);
  background: rgba(139, 0, 0, 0.06);
}

.concept-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  background: var(--red);
  opacity: 0;
  transition: opacity 0.3s;
}

.concept-card:hover::before {
  opacity: 1;
}

.concept-icon {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
}

.concept-title {
  font-family: 'Rubik Mono One', monospace;
  font-size: 0.7rem;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.8rem;
}

.concept-desc {
  font-family: 'VT323', monospace;
  font-size: 1.05rem;
  color: var(--concrete);
  line-height: 1.6;
}

.concept-desc strong {
  color: var(--cream);
}

/* ========== HANDS-ON TASKS ========== */
.tasks {
  padding: 5rem 2rem;
  border-bottom: 4px solid rgba(204, 0, 0, 0.3);
  background: linear-gradient(180deg, transparent 0%, rgba(51, 255, 51, 0.02) 50%, transparent 100%);
}

.tasks-inner {
  max-width: 900px;
  margin: 0 auto;
}

.task-block {
  border: 2px solid rgba(51, 255, 51, 0.15);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.task-block::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 6px;
  height: 100%;
  background: var(--green-term);
  opacity: 0.5;
}

.task-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.5rem 2rem;
  margin-left: 6px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.task-header:hover {
  background: rgba(51, 255, 51, 0.03);
}

.task-num {
  font-family: 'Rubik Mono One', monospace;
  font-size: 1.2rem;
  color: var(--green-term);
  flex-shrink: 0;
  opacity: 0.7;
}

.task-name {
  font-family: 'VT323', monospace;
  font-size: 1.2rem;
  color: var(--cream);
  flex: 1;
}

.task-toggle {
  font-family: 'VT323', monospace;
  font-size: 1.3rem;
  color: var(--green-term);
  transition: transform 0.3s;
  flex-shrink: 0;
}

.task-block.open .task-toggle {
  transform: rotate(90deg);
}

.task-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease;
  margin-left: 6px;
}

.task-block.open .task-content {
  max-height: 3000px;
}

.task-body {
  padding: 0 2rem 2rem 2rem;
}

.task-instructions {
  font-family: 'VT323', monospace;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--concrete);
}

.task-instructions p {
  margin-bottom: 1rem;
}

.code-line {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
  background: rgba(51, 255, 51, 0.06);
  border: 1px solid rgba(51, 255, 51, 0.15);
  padding: 0.8rem 1.2rem;
  margin: 1rem 0;
  color: var(--green-term);
  overflow-x: auto;
  white-space: pre;
  display: block;
}

.calc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
}

.calc-table th {
  text-align: left;
  padding: 0.6rem 1rem;
  border-bottom: 2px solid var(--red);
  color: var(--amber);
  font-weight: normal;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.7rem;
}

.calc-table td {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid rgba(204, 0, 0, 0.1);
  color: var(--concrete);
}

.calc-table td:last-child {
  color: var(--green-term);
}

.calc-table tr:hover td {
  background: rgba(204, 0, 0, 0.03);
}

.binary-example {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.5rem 1.5rem;
  align-items: center;
  margin: 1rem 0;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
}

.binary-label {
  color: var(--concrete);
}

.binary-arrow {
  color: var(--red);
  text-align: center;
}

.binary-value {
  color: var(--green-term);
  font-family: 'Share Tech Mono', monospace;
  background: rgba(51, 255, 51, 0.06);
  padding: 0.3rem 0.6rem;
  border: 1px solid rgba(51, 255, 51, 0.1);
  letter-spacing: 2px;
}

.task-note {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--amber);
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--amber);
  background: rgba(255, 176, 0, 0.04);
}

.task-note::before {
  content: '// NOTE: ';
  color: var(--yellow);
}

/* ========== CS DEEP-DIVE ========== */
.deepdive {
  padding: 5rem 2rem;
  border-bottom: 4px solid rgba(204, 0, 0, 0.3);
  position: relative;
}

.deepdive::before {
  content: '{ }';
  position: absolute;
  top: 2rem;
  right: 3rem;
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(100px, 15vw, 200px);
  color: rgba(204, 0, 0, 0.04);
  pointer-events: none;
}

.deepdive-inner {
  max-width: 900px;
  margin: 0 auto;
}

.deepdive-content {
  font-family: 'VT323', monospace;
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  line-height: 1.8;
  color: var(--cream);
}

.deepdive-content .hl-red {
  color: var(--red);
  font-weight: bold;
}

.deepdive-content .hl-green {
  color: var(--green-term);
}

.deepdive-content .hl-amber {
  color: var(--amber);
}

.deepdive-terminal {
  background: rgba(10, 10, 10, 0.9);
  border: 2px solid rgba(51, 255, 51, 0.2);
  padding: 2rem;
  margin: 2rem 0;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
  color: var(--green-term);
  line-height: 1.8;
  position: relative;
}

.deepdive-terminal::before {
  content: 'TERMINAL';
  position: absolute;
  top: -0.6rem;
  left: 1rem;
  background: var(--black);
  padding: 0 0.5rem;
  font-size: 0.65rem;
  color: var(--green-term);
  letter-spacing: 3px;
}

.deepdive-terminal .term-comment {
  color: var(--concrete);
  opacity: 0.5;
}

.deepdive-terminal .term-value {
  color: var(--amber);
}

/* ========== MINI-PROJECT ========== */
.miniproject {
  padding: 5rem 2rem;
  border-bottom: 8px solid var(--red);
  background: linear-gradient(180deg, rgba(212, 160, 23, 0.06) 0%, transparent 100%);
}

.miniproject-inner {
  max-width: 900px;
  margin: 0 auto;
}

.miniproject-card {
  border: 3px solid var(--yellow);
  padding: 3rem;
  position: relative;
}

.miniproject-card::before {
  content: 'MINI-PROJECT';
  position: absolute;
  top: -0.7rem;
  left: 2rem;
  background: var(--black);
  padding: 0 0.8rem;
  font-family: 'Rubik Mono One', monospace;
  font-size: 0.65rem;
  color: var(--yellow);
  letter-spacing: 3px;
}

.miniproject-title {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--cream);
  margin-bottom: 1.5rem;
}

.miniproject-title .mp-accent {
  color: var(--yellow);
}

.miniproject-tasks {
  font-family: 'VT323', monospace;
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--concrete);
}

.mp-task {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid rgba(212, 160, 23, 0.1);
}

.mp-task:last-child {
  border-bottom: none;
}

.mp-bullet {
  color: var(--yellow);
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.mp-text {
  color: var(--concrete);
}

/* ========== REFERENCES ========== */
.references {
  padding: 5rem 2rem;
  border-bottom: 4px solid rgba(204, 0, 0, 0.3);
  position: relative;
}

.references::before {
  content: '※';
  position: absolute;
  top: 2rem;
  right: 3rem;
  font-size: clamp(100px, 15vw, 200px);
  color: rgba(204, 0, 0, 0.04);
  pointer-events: none;
}

.references-inner {
  max-width: 900px;
  margin: 0 auto;
}

.ref-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 1.5rem;
}

.ref-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.2rem;
  align-items: start;
  padding: 1.2rem 0;
  border-bottom: 1px solid rgba(204, 0, 0, 0.1);
  transition: background 0.2s;
}

.ref-item:first-child {
  border-top: 1px solid rgba(204, 0, 0, 0.1);
}

.ref-item:hover {
  background: rgba(204, 0, 0, 0.03);
}

.ref-badge {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 0.35rem 0.7rem;
  border: 1.5px solid;
  text-align: center;
  min-width: 70px;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.ref-badge.badge-book {
  border-color: var(--amber);
  color: var(--amber);
}

.ref-badge.badge-video {
  border-color: var(--red);
  color: var(--red);
}

.ref-badge.badge-article {
  border-color: var(--green-term);
  color: var(--green-term);
}

.ref-badge.badge-course {
  border-color: var(--cream);
  color: var(--cream);
}

.ref-badge.badge-tool {
  border-color: var(--concrete);
  color: var(--concrete);
}

.ref-body {
  min-width: 0;
}

.ref-title {
  font-family: 'VT323', monospace;
  font-size: 1.25rem;
  color: var(--cream);
  line-height: 1.3;
  margin-bottom: 0.3rem;
}

.ref-title a {
  color: var(--cream);
  text-decoration: none;
  transition: color 0.2s;
}

.ref-title a:hover {
  color: var(--red);
}

.ref-title a::after {
  content: ' ↗';
  font-size: 0.85em;
  color: var(--red);
  opacity: 0.6;
}

.ref-author {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  color: var(--concrete);
  margin-bottom: 0.3rem;
  letter-spacing: 1px;
}

.ref-desc {
  font-family: 'VT323', monospace;
  font-size: 1rem;
  color: var(--concrete);
  opacity: 0.7;
  line-height: 1.5;
}

.ref-tag {
  display: inline-block;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.6rem;
  color: var(--concrete);
  border: 1px solid rgba(184, 176, 160, 0.2);
  padding: 0.15rem 0.5rem;
  margin-top: 0.5rem;
  margin-right: 0.3rem;
  letter-spacing: 1px;
  opacity: 0.6;
}

/* ========== TAKEAWAY ========== */
.takeaway {
  padding: 5rem 2rem;
  background: var(--red);
  position: relative;
  overflow: hidden;
}

.takeaway::before {
  content: '⚡';
  position: absolute;
  font-size: 300px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.08;
  pointer-events: none;
}

.takeaway-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.takeaway-label {
  font-family: 'VT323', monospace;
  font-size: 0.85rem;
  color: var(--black);
  text-transform: uppercase;
  letter-spacing: 6px;
  margin-bottom: 2rem;
  opacity: 0.7;
}

.takeaway-text {
  font-family: 'VT323', monospace;
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  line-height: 1.7;
  color: var(--cream);
}

.takeaway-text strong {
  color: var(--black);
  background: var(--cream);
  padding: 0 0.4rem;
}

/* ========== SESSION FOOTER NAV ========== */
.session-footer-nav {
  padding: 3rem 2rem;
  border-top: 8px solid var(--red);
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

.sfn-link {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: all 0.2s;
  padding: 1rem 1.5rem;
  border: 1px solid rgba(204, 0, 0, 0.2);
}

.sfn-link:hover {
  border-color: var(--red);
  background: rgba(204, 0, 0, 0.05);
}

.sfn-label {
  font-family: 'VT323', monospace;
  font-size: 0.85rem;
  color: var(--concrete);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.sfn-title {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.9rem;
  color: var(--cream);
}

.sfn-link.prev .sfn-label::before {
  content: '← ';
  color: var(--red);
}

.sfn-link.next .sfn-label::after {
  content: ' →';
  color: var(--red);
}

.sfn-link.next {
  text-align: right;
}

.sfn-link.disabled {
  opacity: 0.2;
  pointer-events: none;
}

/* session page minimal footer */
footer.session-footer {
  padding: 2rem;
  border-top: 3px solid rgba(204, 0, 0, 0.2);
}

footer.session-footer p {
  opacity: 0.5;
}


/* ========== SKILLS MAP ========== */
.skills-map {
  padding: 6rem 2rem;
  border-bottom: 8px solid var(--red);
  background: linear-gradient(180deg, var(--black) 0%, rgba(139, 0, 0, 0.08) 50%, var(--black) 100%);
  position: relative;
  overflow: hidden;
}

.skills-map::before {
  content: '{}';
  position: absolute;
  top: -30px;
  right: 2rem;
  font-family: 'Rubik Mono One', monospace;
  font-size: 250px;
  color: rgba(204, 0, 0, 0.03);
  pointer-events: none;
}

.skills-map-inner {
  max-width: 1100px;
  margin: 0 auto;
}

/* --- Skills block (each category) --- */
.skills-block {
  margin-bottom: 3rem;
}

.skills-block-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid rgba(204, 0, 0, 0.15);
}

.skills-block-icon {
  font-size: 1.8rem;
  color: var(--red);
  flex-shrink: 0;
  width: 2.5rem;
  text-align: center;
}

.skills-block-title {
  font-family: 'Rubik Mono One', monospace;
  font-size: clamp(0.7rem, 1.3vw, 0.85rem);
  color: var(--cream);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.skills-block-sub {
  font-family: 'VT323', monospace;
  font-size: 1rem;
  color: var(--amber);
  margin-top: 0.2rem;
}

/* --- Concept tags --- */
.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 1px;
  padding: 0.4rem 0.9rem;
  border: 1.5px solid;
  transition: all 0.25s;
  cursor: default;
}

.skill-tag:hover {
  transform: translateY(-1px);
}

.skill-tag.tag-core {
  border-color: var(--green-term);
  color: var(--green-term);
}
.skill-tag.tag-core:hover { background: rgba(51, 255, 51, 0.08); }

.skill-tag.tag-arch {
  border-color: var(--amber);
  color: var(--amber);
}
.skill-tag.tag-arch:hover { background: rgba(255, 176, 0, 0.08); }

.skill-tag.tag-sys {
  border-color: #a855f7;
  color: #a855f7;
}
.skill-tag.tag-sys:hover { background: rgba(168, 85, 247, 0.08); }

.skill-tag.tag-ship {
  border-color: var(--red);
  color: var(--cream);
  background: rgba(204, 0, 0, 0.15);
}
.skill-tag.tag-ship:hover { background: rgba(204, 0, 0, 0.25); }

/* --- Two-column layout --- */
.skills-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

/* --- DS&A grid --- */
.dsa-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.dsa-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(204, 0, 0, 0.08);
  gap: 0.5rem;
}

.dsa-item:last-child { border-bottom: none; }

.dsa-name {
  font-family: 'VT323', monospace;
  font-size: 1.15rem;
  color: var(--green-term);
  white-space: nowrap;
}

.dsa-use {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.68rem;
  color: var(--concrete);
  text-align: right;
  opacity: 0.65;
}

/* --- Tech stack --- */
.tech-stack {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.tech-group-label {
  font-family: 'Rubik Mono One', monospace;
  font-size: 0.55rem;
  color: var(--red);
  letter-spacing: 3px;
  margin-bottom: 0.5rem;
}

.tech-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tech-items span {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  color: var(--cream);
  padding: 0.3rem 0.7rem;
  background: rgba(204, 0, 0, 0.08);
  border: 1px solid rgba(204, 0, 0, 0.15);
  letter-spacing: 0.5px;
  transition: all 0.2s;
}

.tech-items span:hover {
  border-color: var(--red);
  background: rgba(204, 0, 0, 0.15);
}


/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  /* landing */
  .pixelcraft-header {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .top-bar nav:not(.breadcrumb) { display: none; }
  .level-stats { gap: 1rem; }
  .level-tab {
    padding: 1rem 1rem;
  }
  .level-tab-name {
    font-size: 0.7rem;
  }
  .level-panel-header {
    flex-wrap: wrap;
    gap: 0.8rem;
    padding: 1.5rem 1.2rem 1rem;
  }
  .sessions-list {
    padding: 0 1.2rem 1.5rem 1.2rem;
  }
  .session-title-text {
    font-size: 1.35rem;
  }
  .session-num {
    font-size: 0.75rem;
  }
  .session-item {
    grid-template-columns: 48px 1fr;
  }

  /* skills map responsive */
  .skills-two-col {
    grid-template-columns: 1fr;
  }
  .skill-tag {
    font-size: 0.65rem;
    padding: 0.35rem 0.7rem;
  }

  /* sessions */
  .concept-grid {
    grid-template-columns: 1fr;
  }
  .session-hero {
    min-height: auto;
    padding-top: 6rem;
  }
  .session-title {
    font-size: clamp(1.5rem, 8vw, 2.5rem);
  }
  .task-header {
    padding: 1.2rem 1.2rem;
  }
  .task-body {
    padding: 0 1.2rem 1.5rem;
  }
  .binary-example {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  .binary-arrow { text-align: left; }
  .calc-table { font-size: 0.7rem; }
  .calc-table th, .calc-table td { padding: 0.4rem 0.5rem; }
  .miniproject-card { padding: 2rem 1.5rem; }
  .ref-item {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
  .ref-badge {
    justify-self: start;
  }
  .session-footer-nav {
    flex-direction: column;
    gap: 1rem;
  }
  .sfn-link { width: 100%; }
  .sfn-link.next { text-align: left; }
  .deepdive-terminal {
    padding: 1.5rem;
    font-size: 0.75rem;
  }
}