/* ============================================================
   FONTS (self-hosted)
   ============================================================ */

@font-face {
  font-family: 'Bebas Neue';
  font-style: normal;
  font-weight: 400;
  font-display: block;
  src: url('../fonts/bebas-neue-400.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 300;
  font-display: block;
  src: url('../fonts/ibm-plex-mono-300.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: block;
  src: url('../fonts/ibm-plex-mono-400.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: italic;
  font-weight: 400;
  font-display: block;
  src: url('../fonts/ibm-plex-mono-400-italic.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: block;
  src: url('../fonts/ibm-plex-mono-500.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 600;
  font-display: block;
  src: url('../fonts/ibm-plex-mono-600.woff2') format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400 600;
  font-display: block;
  src: url('../fonts/jetbrains-mono.woff2') format('woff2');
}

/* ============================================================
   TOKENS
   ============================================================ */

:root {
  --bg:           #090d12;
  --bg-surface:   #0d1420;
  --bg-card:      #111a26;
  --bg-code:      #070b10;
  --accent:       #f5a623;
  --accent-dim:   rgba(245, 166, 35, 0.10);
  --accent-glow:  rgba(245, 166, 35, 0.22);
  --green:        #3dd68c;
  --green-dim:    rgba(61, 214, 140, 0.09);
  --green-border: rgba(61, 214, 140, 0.22);
  --blue:         #58a6ff;
  --text:         #7a99b0;
  --text-muted:   #3f5468;
  --text-bright:  #d2e3f0;
  --border:       #162030;
  --border-mid:   #1e3048;
  --font-display: 'Bebas Neue', cursive;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;
  --font-code:    'JetBrains Mono', 'Fira Code', monospace;
  --radius:       5px;
  --max-width:    920px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.85;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0, 0, 0, 0.035) 3px,
    rgba(0, 0, 0, 0.035) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: 0.04em;
  color: var(--text-bright);
  line-height: 1;
}

p { color: var(--text); }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover { color: var(--text-bright); }

/* ============================================================
   HEADER / NAV
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 13, 18, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 54px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.12em;
  color: var(--text-bright);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-logo .prompt { color: var(--accent); }
.nav-logo:hover { color: var(--text-bright); text-decoration: none; }

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  text-decoration: none;
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  padding: 6rem 2rem 4.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-prompt {
  font-family: var(--font-code);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-prompt .dollar { color: var(--green); }

.cursor {
  display: inline-block;
  width: 9px;
  height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1.1s step-end infinite;
}

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

.hero-title {
  font-size: clamp(4.5rem, 13vw, 9rem);
  line-height: 0.93;
  letter-spacing: 0.015em;
  color: var(--text-bright);
  margin-bottom: 1.5rem;
}

.hero-title .hl { color: var(--accent); display: block; }

.hero-tagline {
  font-size: 0.95rem;
  color: var(--text);
  max-width: 490px;
  line-height: 1.9;
  margin-bottom: 2.5rem;
}

.hero-tagline strong { color: var(--text-bright); }

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--accent);
  color: #000;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.8rem 1.65rem;
  border-radius: var(--radius);
  transition: all 0.2s;
}

.hero-cta:hover {
  background: var(--text-bright);
  color: #000;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 2.5rem;
  padding: 0.55rem 1rem;
  background: var(--green-dim);
  border: 1px solid var(--green-border);
  border-radius: 100px;
  font-size: 0.76rem;
  color: var(--green);
}

/* ============================================================
   PHILOSOPHY STRIP
   ============================================================ */

.philosophy {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  padding: 4rem 2rem;
}

.philosophy-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.phil-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.phil-text {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--text);
}

.phil-text em {
  color: var(--accent);
  font-style: normal;
  font-weight: 500;
}

/* Fake terminal window */
.fake-terminal {
  background: var(--bg-code);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.t-titlebar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.t-dot { width: 10px; height: 10px; border-radius: 50%; }
.t-dot.r { background: #ff5f57; }
.t-dot.y { background: #ffbd2e; }
.t-dot.g { background: #28c940; }

.t-wintitle {
  margin-left: auto;
  font-family: var(--font-code);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.t-body {
  padding: 1.25rem 1.5rem;
  font-family: var(--font-code);
  font-size: 0.8rem;
  line-height: 2.1;
}

.t-line { display: block; }
.t-ps   { color: var(--green); user-select: none; }
.t-cmd  { color: var(--text-bright); }
.t-flag { color: var(--accent); }
.t-path { color: var(--blue); }
.t-out  { color: var(--text-muted); }

/* ============================================================
   DISTRO SECTION
   ============================================================ */

.distro-section {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  padding: 4rem 2rem;
}

.distro-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.distro-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: var(--text-bright);
  margin-bottom: 1rem;
  line-height: 1;
}

.distro-desc {
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.9;
  max-width: 480px;
  margin-bottom: 0.6rem;
}

.distro-desc strong { color: var(--text-bright); }

.distro-cards {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-top: 2.5rem;
}

.distro-pick {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  position: relative;
}

.distro-pick.best {
  border-color: var(--accent);
}

.distro-pick.muted {
  opacity: 0.55;
}

.dp-badge {
  position: absolute;
  top: -1px;
  right: 1rem;
  font-family: var(--font-code);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--accent);
  color: #000;
  padding: 0.15rem 0.5rem;
  border-radius: 0 0 3px 3px;
}

.dp-name {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--text-bright);
  margin-bottom: 0.25rem;
}

.dp-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================================
   LESSONS SECTION
   ============================================================ */

.lessons-section {
  padding: 5rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.sec-eyebrow {
  font-family: var(--font-code);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.sec-title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  color: var(--text-bright);
  margin-bottom: 0.75rem;
}

.sec-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 440px;
  margin-bottom: 3rem;
}

.lessons-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.lesson-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.65rem;
  transition: border-color 0.22s, transform 0.22s, box-shadow 0.22s;
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.lesson-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.25s;
}

.lesson-card:hover {
  border-color: var(--border-mid);
  transform: translateY(-4px);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.35);
  text-decoration: none;
}

.lesson-card:hover::after { transform: scaleX(1); }

.card-num {
  font-family: var(--font-code);
  font-size: 0.72rem;
  color: var(--accent);
  opacity: 0.75;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.75rem;
  color: var(--text-bright);
  line-height: 1.05;
  margin-bottom: 0.85rem;
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.5rem;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.tag {
  font-family: var(--font-code);
  font-size: 0.68rem;
  padding: 0.18rem 0.5rem;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--green);
}

.card-link {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: right;
  transition: color 0.2s;
}

.lesson-card:hover .card-link { color: var(--accent); }

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-text {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.footer-text a { color: var(--text-muted); }
.footer-text a:hover { color: var(--accent); }

/* ============================================================
   LESSON PAGE LAYOUT
   ============================================================ */

.lesson-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 2rem 6rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
  transition: color 0.2s;
}

.back-link:hover { color: var(--accent); text-decoration: none; }

.lesson-header {
  margin-bottom: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.lesson-eyebrow {
  font-family: var(--font-code);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.75rem;
}

.lesson-title {
  font-size: clamp(3.5rem, 9vw, 6.5rem);
  color: var(--text-bright);
  line-height: 0.92;
  margin-bottom: 1.25rem;
}

.lesson-intro {
  font-size: 0.95rem;
  color: var(--text);
  max-width: 600px;
  line-height: 1.9;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.meta-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.meta-badge .mi { color: var(--accent); }

/* ============================================================
   LESSON CONTENT BLOCKS
   ============================================================ */

.content-block {
  margin-bottom: 3.5rem;
}

.content-block h2 {
  font-size: 2.2rem;
  color: var(--text-bright);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.content-block h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 2.25rem 0 0.75rem;
}

.content-block p {
  color: var(--text);
  max-width: 680px;
  margin-bottom: 0.9rem;
}

.content-block p:last-child { margin-bottom: 0; }

/* Command card */
.cmd-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.5rem 0;
}

.cmd-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 1rem;
  background: var(--bg-code);
  border-bottom: 1px solid var(--border);
}

.cmd-card-name {
  font-family: var(--font-code);
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
}

.cmd-card-tag {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.cmd-card-body { padding: 1.25rem 1.5rem; }

.cmd-card-desc {
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 1.1rem;
  max-width: 560px;
  line-height: 1.8;
}

/* Terminal block */
.terminal {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-family: var(--font-code);
  font-size: 0.8rem;
  line-height: 2;
  overflow-x: auto;
}

.terminal .t-ps      { color: var(--green); user-select: none; }
.terminal .t-cmd     { color: var(--text-bright); }
.terminal .t-flag    { color: var(--accent); }
.terminal .t-path    { color: var(--blue); }
.terminal .t-out     { color: var(--text-muted); }
.terminal .t-dir     { color: var(--blue); font-weight: bold; }
.terminal .t-exec    { color: var(--green); font-weight: bold; }
.terminal .t-warn    { color: #ff5f57; }
.terminal .t-comment { color: var(--text-muted); font-style: italic; }
.terminal .t-good    { color: var(--green); }

.terminal-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* Try it box */
.try-it {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--green-dim);
  border: 1px solid var(--green-border);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  margin: 1.5rem 0;
}

.try-icon { color: var(--green); flex-shrink: 0; line-height: 1.85; }

.try-text {
  font-size: 0.83rem;
  color: var(--text);
  line-height: 1.75;
}

.try-text strong { color: var(--green); }
.try-text code {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: var(--text-bright);
  background: var(--bg-code);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

/* Tip / info box */
.tip {
  background: var(--accent-dim);
  border: 1px solid rgba(245, 166, 35, 0.18);
  border-radius: var(--radius);
  padding: 1rem 1.4rem;
  margin: 1.25rem 0;
  font-size: 0.83rem;
  color: var(--text);
  line-height: 1.75;
}

.tip strong { color: var(--accent); }
.tip code {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: var(--text-bright);
  background: var(--bg-code);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

/* Warning box */
.warn {
  background: rgba(255, 95, 87, 0.07);
  border: 1px solid rgba(255, 95, 87, 0.2);
  border-radius: var(--radius);
  padding: 1rem 1.4rem;
  margin: 1.25rem 0;
  font-size: 0.83rem;
  color: var(--text);
  line-height: 1.75;
}

.warn strong { color: #ff5f57; }
.warn code {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: var(--text-bright);
  background: var(--bg-code);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

/* Filesystem tree */
.fs-tree {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  font-family: var(--font-code);
  font-size: 0.8rem;
  line-height: 2.1;
  margin: 1.25rem 0;
  overflow-x: auto;
}

.fs-tree .ft-root { color: var(--accent); font-weight: 700; }
.fs-tree .ft-dir  { color: var(--blue); font-weight: 600; }
.fs-tree .ft-desc { color: var(--text-muted); }

/* Permissions explainer */
.perms-explainer {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.25rem 0;
  font-family: var(--font-code);
}

.perms-string {
  padding: 1.25rem 1.5rem 0.75rem;
  font-size: 1.6rem;
  letter-spacing: 0.12em;
  display: flex;
  gap: 0.05rem;
}

.ps-type { color: var(--text-muted); }
.ps-own  { color: var(--accent); }
.ps-grp  { color: var(--blue); }
.ps-oth  { color: var(--green); }
.ps-gap  { color: var(--border-mid); margin: 0 0.15rem; user-select: none; }

.perms-legend {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
}

.pl-item {
  padding: 0.65rem 1rem;
  border-right: 1px solid var(--border);
  font-size: 0.73rem;
}

.pl-item:last-child { border-right: none; }
.pl-label { color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; display: block; margin-bottom: 0.2rem; }
.pl-val.own { color: var(--accent); }
.pl-val.grp { color: var(--blue); }
.pl-val.oth { color: var(--green); }

/* Distro table */
.distro-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.82rem;
  margin: 1.25rem 0;
}

.distro-table th {
  background: var(--bg-card);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.65rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.distro-table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.distro-table tr:last-child td { border-bottom: none; }

.distro-table td code {
  font-family: var(--font-code);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--bg-code);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

.distro-name { font-weight: 600; color: var(--text-bright); }

/* Lesson pagination nav */
.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.lesson-nav-card {
  display: block;
  padding: 1.1rem 1.35rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
  text-decoration: none;
}

.lesson-nav-card:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.lnc-dir {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.lnc-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--text-bright);
}

.lesson-nav-card.next { text-align: right; }
.lesson-nav-card.wide { grid-column: 1 / -1; text-align: center; }

/* ============================================================
   MOBILE NAV TOGGLE
   ============================================================ */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: transform 0.22s, opacity 0.22s, background 0.2s;
}

.nav-toggle:hover span { background: var(--accent); }

/* animate to X when open */
.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 768px) {
  .philosophy-inner,
  .distro-inner,
  .lessons-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .distro-cards { padding-top: 0; }

  .lesson-nav { grid-template-columns: 1fr; }

  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 54px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(9, 13, 18, 0.97);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0 1rem;
  }

  .nav-links li { width: 100%; }

  .nav-links a {
    display: block;
    padding: 0.75rem 2rem;
    font-size: 0.85rem;
  }

  .nav-open .nav-links { display: flex; }

  .site-header { position: sticky; }

  .perms-legend { grid-template-columns: 1fr; }
  .pl-item { border-right: none; border-bottom: 1px solid var(--border); }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero            { padding: 3.5rem 1.25rem 3rem; }
  .lessons-section { padding: 3rem 1.25rem; }
  .lesson-main     { padding: 2rem 1.25rem 4rem; }
  .philosophy      { padding: 3rem 1.25rem; }
}