/* ================================================================
   DESIGN TOKENS  —  Olive / Black / White  Academic palette
   Base font bumped +13% throughout (15px → 17px body reference)
   ================================================================ */
:root {
  --white:        #FFFFFF;
  --off-white:    #F5F3EE;
  --light-gray:   #ECEAE3;
  --mid-gray:     #C6C1B6;
  --dim:          #888278;
  --text:         #141414;
  --text-light:   #383838;
  --black:        #0C0C0C;
  --olive:        #556B2F;
  --olive-light:  #6B8E23;
  --olive-dark:   #3A4D1E;
  --olive-pale:   #EDF1E3;
  --olive-mid:    #C3CF9C;
  --hit-bg:       #E9F3D8;
  --fault-bg:     #F9E8E6;
  --fault-red:    #B53027;
  --border:       #141414;
  --border-light: #C6C1B6;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--off-white);
  color: var(--text);
  font-family: 'Lato', sans-serif;
  font-size: 20px;        /* +13% base */
  line-height: 1.72;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: 'Playfair Display', Georgia, serif;
  line-height: 1.16;
  color: var(--black);
  font-weight: 700;
}
h1 { font-size: clamp(2.65rem, 5vw, 4.37rem); letter-spacing: -0.5px; }
h2 { font-size: clamp(1.84rem, 3vw, 2.47rem); }
h3 { font-size: 1.47rem; }
h4 {
  font-family: 'Lato', sans-serif;
  font-size: 0.87rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--text-light);
}
p  { font-size: 1.21rem; color: var(--text-light); line-height: 1.8; }
strong { font-weight: 700; color: var(--text); }
code, .mono { font-family: 'Source Code Pro', monospace; font-size: 1.03em; }

/* ================================================================
   LANDING — full-viewport centered hero, shown at first load
   ================================================================ */
#landing {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--black);
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 40px 24px;
}
/* subtle grid texture */
#landing::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(85,107,47,0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(85,107,47,0.10) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
}
/* radial glow */
#landing::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 72% 70% at 50% 50%, rgba(85,107,47,0.24) 0%, transparent 70%);
  pointer-events: none;
}
.landing-inner {
  position: relative; z-index: 1;
  max-width: 780px;
}
.landing-eyebrow {
  font-family: 'Source Code Pro', monospace;
  font-size: 0.90rem;
  font-weight: 600;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--olive-light);
  margin-bottom: 22px;
  display: flex; align-items: center; justify-content: center; gap: 14px;
}
.landing-eyebrow::before,
.landing-eyebrow::after {
  content: ''; display: block;
  width: 42px; height: 1px;
  background: var(--olive-light); opacity: 0.65;
}
#landing h1 { color: var(--white); margin-bottom: 24px; }
#landing h1 em { color: var(--olive-light); font-style: italic; }

.landing-sub {
  font-size: 1.30rem;
  color: rgba(255,255,255,0.64);
  max-width: 560px;
  margin: 0 auto 42px;
  line-height: 1.84;
}

/* Tab buttons row shown on landing */
.landing-tabs {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}
.landing-tab-btn {
  font-family: 'Lato', sans-serif;
  font-size: 0.95rem;
  font-weight: 900;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  padding: 14px 34px;
  border: 2px solid rgba(255,255,255,0.18);
  background: transparent;
  color: rgba(255,255,255,0.72);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.landing-tab-btn:hover,
.landing-tab-btn:focus {
  background: var(--olive);
  border-color: var(--olive);
  color: var(--white);
  outline: none;
}
.landing-tab-btn.primary-cta {
  background: var(--olive);
  border-color: var(--olive);
  color: var(--white);
}
.landing-tab-btn.primary-cta:hover {
  background: var(--olive-dark);
  border-color: var(--olive-dark);
}

/* ================================================================
   APP SHELL — visible after a tab is chosen
   ================================================================ */
#app { display: none; flex-direction: column; min-height: 100vh; }

/* Slim top bar with title + tabs */
.app-bar {
  background: var(--black);
  border-bottom: 2px solid var(--olive);
  display: flex;
  align-items: stretch;
  position: sticky;
  top: 0;
  z-index: 300;
}

.app-bar-brand {
  font-family: 'Playfair Display', serif;
  font-size: 1.09rem;
  font-weight: 700;
  color: var(--white);
  padding: 0 28px;
  display: flex;
  align-items: center;
  border-right: 1px solid rgba(255,255,255,0.1);
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.15s;
}
.app-bar-brand span { color: var(--olive-light); }
.app-bar-brand:hover { color: var(--olive-light); }

.app-tabs {
  display: flex;
  flex: 1;
  overflow-x: auto;
}
.app-tab-btn {
  font-family: 'Lato', sans-serif;
  font-size: 0.90rem;
  font-weight: 900;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  padding: 18px 26px;
  border: none;
  background: transparent;
  color: rgba(255,255,255,0.45);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color 0.18s, border-color 0.18s;
  white-space: nowrap;
}
.app-tab-btn:hover { color: rgba(255,255,255,0.82); }
.app-tab-btn.active {
  color: var(--white);
  border-bottom-color: var(--olive-light);
}

/* ================================================================
   TAB CONTENT PAGES
   ================================================================ */
.tab-page { display: none; }
.tab-page.active { display: block; }

/* ================================================================
   SHARED UTILITIES
   ================================================================ */
.section-label {
  font-family: 'Source Code Pro', monospace;
  font-size: 0.87rem;
  font-weight: 600;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--olive);
  margin-bottom: 9px;
}
.lead {
  font-size: 1.27rem;
  color: var(--text-light);
  line-height: 1.85;
  max-width: 700px;
  margin-bottom: 50px;
}
.callout {
  background: var(--olive-pale);
  border: 1px solid var(--olive-mid);
  border-left: 5px solid var(--olive);
  padding: 22px 28px;
  margin-bottom: 58px;
}
.callout p { font-size: 1.17rem; margin: 0; }
.callout strong { color: var(--olive-dark); }

.hidden { display: none !important; }
.text-dim { color: var(--dim); }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }

/* ================================================================
   TAB 1 — INTRODUCTION
   ================================================================ */
.intro-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 66px 48px 80px;
}

/* Concept cards */
.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  border: 2px solid var(--border);
  margin-bottom: 66px;
}
.concept-card {
  background: var(--white);
  padding: 36px 32px;
  border-right: 1px solid var(--border);
  transition: background 0.18s;
}
.concept-card:last-child { border-right: none; }
.concept-card:hover { background: var(--olive-pale); }
.concept-card .card-number {
  font-family: 'Playfair Display', serif;
  font-size: 3.4rem; font-weight: 700;
  color: var(--olive-mid); line-height: 1;
  margin-bottom: 14px;
}
.concept-card h3 { margin-bottom: 12px; }
.concept-card p  { font-size: 1.13rem; line-height: 1.75; }

/* Steps */
.how-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 66px;
}
.step-item { display: flex; gap: 18px; align-items: flex-start; }
.step-num {
  flex-shrink: 0;
  width: 40px; height: 40px;
  background: var(--olive); color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Playfair Display', serif;
  font-size: 1.08rem; font-weight: 700;
}
.step-item h4 { margin-bottom: 5px; }
.step-item p  { font-size: 0.96rem; }

/* Algorithm table */
.algo-table-wrap { margin-bottom: 66px; }
.algo-table-wrap .lead { margin-bottom: 22px; }
.edu-table {
  width: 100%; border-collapse: collapse;
  border: 2px solid var(--border);
  font-size: 0.98rem;
}
.edu-table th {
  background: var(--black); color: var(--white);
  padding: 14px 18px; text-align: left;
  font-family: 'Lato', sans-serif;
  font-size: 0.76rem; font-weight: 900;
  letter-spacing: 2.5px; text-transform: uppercase;
}
.edu-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: top; line-height: 1.64;
}
.edu-table tr:last-child td { border-bottom: none; }
.edu-table tr:nth-child(even) td { background: var(--off-white); }
.edu-table tr:hover td { background: var(--olive-pale); transition: background 0.14s; }
.algo-badge {
  display: inline-block;
  font-family: 'Source Code Pro', monospace;
  font-size: 0.82rem; font-weight: 600;
  padding: 4px 12px;
  background: var(--olive-pale);
  border: 1px solid var(--olive-mid);
  color: var(--olive-dark);
}

/* Terms */
.terms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
  margin-bottom: 58px;
}
.term-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--olive);
  padding: 18px 22px;
}
.term-card dt {
  font-family: 'Source Code Pro', monospace;
  font-size: 0.86rem; font-weight: 600;
  color: var(--olive-dark); margin-bottom: 6px;
}
.term-card dd { font-size: 0.95rem; color: var(--text-light); line-height: 1.66; }

.intro-bottom-cta { text-align: center; padding: 12px 0 44px; }
.hero-cta {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--olive); color: var(--white);
  padding: 14px 34px;
  font-family: 'Lato', sans-serif;
  font-size: 0.84rem; font-weight: 900;
  letter-spacing: 2.5px; text-transform: uppercase;
  border: 2px solid var(--olive);
  cursor: pointer;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}
.hero-cta:hover {
  background: transparent; color: var(--olive-light);
  border-color: var(--olive-light);
}

/* ================================================================
   TAB 2 — SIMULATOR
   ================================================================ */
.sim-layout {
  display: grid;
  grid-template-columns: 272px 1fr;
  grid-template-rows: 1fr auto;
  min-height: calc(100vh - 58px);
  overflow: hidden;
}
.sim-sidebar {
  grid-column: 1; grid-row: 1;
  background: var(--white);
  border-right: 2px solid var(--border);
  padding: 30px 24px;
  overflow-y: auto; overflow-x: hidden;
}
.sim-main {
  grid-column: 2; grid-row: 1;
  background: var(--off-white);
  padding: 30px 34px;
  overflow-y: auto; overflow-x: hidden;
  min-width: 0;
}
.sim-status-bar {
  grid-column: 1 / -1; grid-row: 2;
  background: var(--black);
  color: rgba(255,255,255,0.52);
  padding: 7px 24px;
  font-family: 'Source Code Pro', monospace;
  font-size: 0.8rem;
  display: flex; flex-wrap: wrap; gap: 22px; align-items: center;
  border-top: 2px solid var(--olive);
}
.status-indicator { color: var(--olive-light); font-weight: 600; }

/* Sidebar internals */
.sidebar-section {
  margin-bottom: 28px; padding-bottom: 28px;
  border-bottom: 1px solid var(--border-light);
}
.sidebar-section:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.sidebar-title {
  font-family: 'Lato', sans-serif;
  font-size: 0.72rem; font-weight: 900;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--dim); margin-bottom: 14px;
}

/* Form elements */
.form-group { margin-bottom: 14px; }
.form-group:last-child { margin-bottom: 0; }
.form-group label {
  display: block;
  font-size: 0.82rem; font-weight: 700;
  letter-spacing: 0.8px; color: var(--text-light);
  margin-bottom: 5px; text-transform: uppercase;
  font-family: 'Lato', sans-serif;
}

input[type=text], input[type=number], textarea, select {
  width: 100%; max-width: 100%;
  background: var(--white);
  border: 1.5px solid var(--border-light);
  color: var(--text);
  font-family: 'Source Code Pro', monospace;
  font-size: 0.95rem;
  padding: 9px 12px;
  outline: none;
  transition: border-color 0.14s, box-shadow 0.14s;
  border-radius: 0; appearance: none; -webkit-appearance: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--olive);
  box-shadow: 0 0 0 3px rgba(85,107,47,0.12);
}
textarea { resize: vertical; min-height: 74px; line-height: 1.64; }

/* Algo selector */
.algo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.algo-btn {
  font-family: 'Source Code Pro', monospace;
  font-size: 0.84rem; font-weight: 600;
  padding: 10px 6px;
  border: 1.5px solid var(--border-light);
  background: var(--white); color: var(--dim);
  cursor: pointer; transition: all 0.14s; text-align: center;
}
.algo-btn:hover { border-color: var(--olive); color: var(--olive-dark); background: var(--olive-pale); }
.algo-btn.active { border-color: var(--olive); background: var(--olive); color: var(--white); }

/* Frame count box */
.frame-count-display {
  background: var(--black); color: var(--white);
  padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 6px;
}
.fc-label { font-size: 0.72rem; letter-spacing: 2.5px; text-transform: uppercase; color: rgba(255,255,255,0.42); }
.fc-val   { font-family: 'Playfair Display', serif; font-size: 1.8rem; font-weight: 700; color: var(--olive-light); }

/* Buttons */
.btn-row { display: flex; gap: 7px; margin-bottom: 7px; width: 100%; }
.btn {
  font-family: 'Lato', sans-serif;
  font-size: 0.76rem; font-weight: 900;
  letter-spacing: 2px; text-transform: uppercase;
  padding: 10px 10px; border: 2px solid;
  cursor: pointer; transition: all 0.14s;
  flex: 1; min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.btn-primary { background: var(--olive); border-color: var(--olive); color: var(--white); }
.btn-primary:hover { background: var(--olive-dark); border-color: var(--olive-dark); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { background: var(--black); color: var(--white); border-color: var(--black); }
.btn-danger  { background: transparent; border-color: var(--fault-red); color: var(--fault-red); }
.btn-danger:hover  { background: var(--fault-red); color: var(--white); }
.btn:disabled { opacity: 0.32; cursor: not-allowed; }

/* Slider */
input[type=range] {
  -webkit-appearance: none; appearance: none;
  background: var(--light-gray); border: 1px solid var(--border-light);
  height: 5px; border-radius: 0; padding: 0; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px; height: 15px; background: var(--olive); border-radius: 0;
}
input[type=range]::-moz-range-thumb {
  width: 15px; height: 15px; background: var(--olive); border-radius: 0; border: none;
}

/* Toggle */
.toggle-row { display: flex; align-items: center; gap: 12px; margin-bottom: 11px; }
.toggle {
  width: 40px; height: 22px;
  background: var(--light-gray); border: 1.5px solid var(--border-light);
  border-radius: 11px; position: relative; cursor: pointer; transition: all 0.18s;
  flex-shrink: 0;
}
.toggle.on { background: var(--olive); border-color: var(--olive-dark); }
.toggle::after {
  content: ''; position: absolute; top: 2px; left: 2px;
  width: 14px; height: 14px; border-radius: 50%; background: var(--white);
  transition: all 0.18s; box-shadow: 0 1px 3px rgba(0,0,0,0.22);
}
.toggle.on::after { left: 20px; }
.toggle-label { font-size: 0.92rem; color: var(--text-light); }

/* Sim main area */
.sim-section-title {
  font-family: 'Lato', sans-serif;
  font-size: 0.72rem; font-weight: 900;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--dim); margin-bottom: 10px;
  padding-bottom: 7px; border-bottom: 1px solid var(--border-light);
}

/* Reference string */
.ref-display {
  display: flex; gap: 5px; flex-wrap: wrap;
  padding: 14px; background: var(--white);
  border: 1.5px solid var(--border-light);
  min-height: 60px; align-items: center; margin-bottom: 22px;
}
.ref-token {
  width: 38px; height: 38px;
  border: 1.5px solid var(--border-light);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Source Code Pro', monospace;
  font-size: 0.94rem; font-weight: 600; color: var(--dim);
  transition: all 0.18s; flex-shrink: 0;
}
.ref-token.current {
  border-color: var(--olive-dark); background: var(--olive); color: var(--white);
  transform: scale(1.1); box-shadow: 0 2px 10px rgba(85,107,47,0.38);
}
.ref-token.done-hit   { border-color: var(--olive-light); background: var(--hit-bg);  color: var(--olive-dark); }
.ref-token.done-fault { border-color: var(--fault-red);   background: var(--fault-bg); color: var(--fault-red); }

/* Memory grid */
.memory-grid-wrap {
  background: var(--white); border: 1.5px solid var(--border-light);
  padding: 22px; margin-bottom: 22px;
}
.memory-grid { display: flex; gap: 10px; flex-wrap: wrap; }
.frame {
  width: 76px; height: 76px;
  border: 2px solid var(--border-light); background: var(--off-white);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: relative; transition: all 0.24s ease; flex-shrink: 0;
}
.frame .frame-num {
  position: absolute; top: 4px; left: 6px;
  font-family: 'Source Code Pro', monospace; font-size: 0.68rem; color: var(--dim); font-weight: 600;
}
.frame .frame-page {
  font-family: 'Playfair Display', serif; font-size: 1.6rem; font-weight: 700; color: var(--text);
}
.frame.empty .frame-page { color: var(--border-light); font-size: 1.1rem; }
.frame .frame-age {
  position: absolute; bottom: 4px;
  font-family: 'Source Code Pro', monospace; font-size: 0.64rem; color: var(--dim);
}
.frame.hit   { border-color: var(--olive);     background: var(--hit-bg);  animation: frameHit   0.4s ease; }
.frame.hit   .frame-page { color: var(--olive-dark); }
.frame.fault { border-color: var(--fault-red); background: var(--fault-bg); animation: frameFault 0.5s ease; }
.frame.fault .frame-page { color: var(--fault-red); }
@keyframes frameHit   { 0%{ transform: scale(1); } 40%{ transform: scale(1.08); } 100%{ transform: scale(1); } }
@keyframes frameFault { 0%{ transform: translateX(0); } 20%{ transform: translateX(-5px); } 40%{ transform: translateX(5px); } 65%{ transform: translateX(-2px); } 100%{ transform: translateX(0); } }

/* Quick stats */
.quick-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-bottom: 22px; }
.qs-card { background: var(--white); border: 1.5px solid var(--border-light); padding: 17px 19px; }
.qs-label {
  font-size: 0.71rem; font-weight: 900; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--dim); margin-bottom: 7px;
}
.qs-value { font-family: 'Playfair Display', serif; font-size: 2.1rem; font-weight: 700; line-height: 1; }

/* Step log */
.step-log {
  background: var(--white); border: 1.5px solid var(--border-light);
  height: 194px; overflow-y: auto;
  font-family: 'Source Code Pro', monospace; font-size: 0.88rem;
  scrollbar-width: thin; scrollbar-color: var(--border-light) transparent;
  margin-bottom: 22px;
}
.log-entry {
  padding: 6px 14px; border-bottom: 1px solid rgba(0,0,0,0.04);
  display: flex; gap: 12px; align-items: baseline;
}
.log-step  { color: var(--dim); min-width: 34px; font-size: 0.79rem; }
.log-hit   { color: var(--olive-dark); font-weight: 600; }
.log-fault { color: var(--fault-red);  font-weight: 600; }
.log-sys   { color: var(--dim); }

/* Page table */
.page-table {
  width: 100%; border-collapse: collapse;
  border: 1.5px solid var(--border-light);
  font-size: 0.94rem; margin-bottom: 22px;
}
.page-table th {
  background: var(--black); color: var(--white);
  padding: 10px 14px; text-align: left;
  font-family: 'Lato', sans-serif;
  font-size: 0.72rem; font-weight: 900;
  letter-spacing: 2.5px; text-transform: uppercase;
}
.page-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border-light);
  font-family: 'Source Code Pro', monospace;
}
.page-table tr:nth-child(even) td { background: var(--off-white); }
.page-table tr:hover td { background: var(--olive-pale); }
.bit-1 { color: var(--olive-dark); font-weight: 600; }
.bit-0 { color: var(--fault-red);  font-weight: 600; }

/* Segmentation */
.seg-wrap {
  background: var(--white); border: 1.5px solid var(--border-light);
  padding: 18px 22px; margin-bottom: 22px;
}
.seg-bar {
  height: 44px; background: var(--off-white);
  border: 1.5px solid var(--border-light);
  display: flex; overflow: hidden; margin: 12px 0 10px;
}
.seg-block {
  height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Source Code Pro', monospace;
  font-size: 0.76rem; font-weight: 600;
  border-right: 1px solid var(--border-light);
  overflow: hidden; transition: all 0.5s ease;
  white-space: nowrap; cursor: default;
}
.seg-frag {
  background: repeating-linear-gradient(45deg, rgba(181,48,39,0.12), rgba(181,48,39,0.12) 3px, transparent 3px, transparent 7px);
  color: var(--fault-red); border-right-color: rgba(181,48,39,0.28);
}
.seg-legend { font-size: 0.84rem; color: var(--dim); display: flex; gap: 18px; flex-wrap: wrap; margin-top: 6px; }

/* ================================================================
   TAB 3 — ANALYTICS
   ================================================================ */
.analytics-layout { max-width: 1160px; margin: 0 auto; padding: 48px 52px 80px; }

.analytics-header { margin-bottom: 42px; padding-bottom: 24px; border-bottom: 2px solid var(--border); }
.analytics-header h2 { margin-bottom: 7px; }
.analytics-header p  { font-size: 0.98rem; color: var(--dim); }

.stats-row {
  display: grid; grid-template-columns: repeat(4,1fr);
  border: 2px solid var(--border); background: var(--border);
  margin-bottom: 42px;
}
.stat-box { background: var(--white); padding: 28px 24px; }
.stat-label {
  font-family: 'Lato', sans-serif; font-size: 0.72rem; font-weight: 900;
  letter-spacing: 3px; text-transform: uppercase; color: var(--dim); margin-bottom: 11px;
}
.stat-value {
  font-family: 'Playfair Display', serif;
  font-size: 2.7rem; font-weight: 700; line-height: 1; margin-bottom: 6px;
}
.stat-sub  { font-size: 0.88rem; color: var(--dim); }
.sv-olive  { color: var(--olive-dark); }
.sv-red    { color: var(--fault-red); }
.sv-black  { color: var(--black); }

.gauge-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 42px; }
.gauge-card {
  background: var(--white); border: 1.5px solid var(--border-light); padding: 24px 26px;
}
.gauge-title {
  font-family: 'Lato', sans-serif; font-size: 0.74rem; font-weight: 900;
  letter-spacing: 2.5px; text-transform: uppercase; color: var(--dim); margin-bottom: 14px;
}
.gauge-bar {
  height: 11px; background: var(--light-gray);
  border: 1px solid var(--border-light); overflow: hidden; margin-bottom: 8px;
}
.gauge-fill-hit   { height: 100%; background: var(--olive);     transition: width 0.6s ease; }
.gauge-fill-fault { height: 100%; background: var(--fault-red); transition: width 0.6s ease; }
.gauge-val { font-family: 'Source Code Pro', monospace; font-size: 1rem; font-weight: 600; color: var(--text); }

.charts-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; margin-bottom: 42px; }
.chart-card {
  background: var(--white); border: 1.5px solid var(--border-light); padding: 28px 26px;
}
.chart-card-title { font-family: 'Playfair Display', serif; font-size: 1.12rem; font-weight: 700; margin-bottom: 5px; }
.chart-card-sub   { font-size: 0.88rem; color: var(--dim); margin-bottom: 18px; line-height: 1.58; }

.belady-alert {
  display: none;
  background: #FFF8E1; border: 1.5px solid #C8A000; border-left: 5px solid #C8A000;
  padding: 16px 22px; margin-bottom: 26px;
  font-size: 0.98rem; color: #6B5200; line-height: 1.64;
}
.belady-alert.visible { display: block; }
.belady-alert strong { color: #5A4200; }

.viva-card {
  background: var(--olive-pale); border: 1.5px solid var(--olive-mid);
  border-left: 5px solid var(--olive); padding: 28px 30px; margin-bottom: 42px;
}
.viva-header {
  font-family: 'Lato', sans-serif; font-size: 0.74rem; font-weight: 900;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--olive-dark); margin-bottom: 17px;
  display: flex; align-items: center; gap: 10px;
}
.viva-header::before { content: '◆'; font-size: 0.64rem; }
.viva-obs {
  font-size: 0.98rem; color: var(--text); line-height: 1.82;
  padding: 9px 0; border-bottom: 1px solid rgba(85,107,47,0.14);
}
.viva-obs:last-child { border-bottom: none; }

.full-log-card { background: var(--white); border: 1.5px solid var(--border-light); margin-bottom: 42px; }
.full-log-header {
  background: var(--black); color: var(--white); padding: 14px 22px;
  font-family: 'Lato', sans-serif; font-size: 0.74rem; font-weight: 900;
  letter-spacing: 3px; text-transform: uppercase;
  display: flex; justify-content: space-between; align-items: center;
}
.full-log-body {
  height: 298px; overflow-y: auto;
  font-family: 'Source Code Pro', monospace; font-size: 0.88rem;
  scrollbar-width: thin; scrollbar-color: var(--border-light) transparent;
}
.full-log-body .log-entry { padding: 6px 22px; }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 860px) {
  .sim-layout { grid-template-columns: 1fr; grid-template-rows: auto 1fr auto; }
  .sim-sidebar { grid-column: 1; grid-row: 1; border-right: none; border-bottom: 2px solid var(--border); overflow-y: visible; }
  .sim-main    { grid-column: 1; grid-row: 2; }
  .sim-status-bar { grid-column: 1; grid-row: 3; }
  .stats-row   { grid-template-columns: 1fr 1fr; }
  .charts-grid { grid-template-columns: 1fr; }
  .gauge-row   { grid-template-columns: 1fr; }
  .quick-stats { grid-template-columns: 1fr 1fr 1fr; }
  .concepts-grid { grid-template-columns: 1fr; }
  .concept-card { border-right: none; border-bottom: 1px solid var(--border); }
  .concept-card:last-child { border-bottom: none; }
  .intro-wrap  { padding: 42px 22px; }
  .analytics-layout { padding: 30px 22px; }
  .app-bar-brand { display: none; } /* hide on small screens to save space */
}
@media (max-width: 520px) {
  .quick-stats { grid-template-columns: 1fr; }
  .stats-row   { grid-template-columns: 1fr; }
  h1 { font-size: 2rem; }
}