/* ==========================================================================
   mulle-sde.github.io — pure CSS, no JavaScript, no build step.
   Retro terminal / CRT theme: amber phosphor on warm black, scanlines,
   box-drawing chrome. Deliberately nothing like mulle-core's "lava" look.
   ========================================================================== */

:root {
   --bg:            #0b0a07;
   --bg-soft:       #100e09;
   --panel:         #14110b;
   --panel-hover:   #1b1710;
   --border:        rgba(255, 176, 0, 0.18);
   --border-strong: rgba(255, 176, 0, 0.42);

   --text:          #f3e6ca;
   --muted:         #b39d74;
   --faint:         #7f7053;

   --amber:         #ffb000;
   --amber-dim:     #c98a00;
   --green:         #9ece6a;
   --red:           #ff5f57;

   --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono",
                "IBM Plex Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;

   --radius: 4px;
   --maxw: 1080px;
   --glow: 0 0 8px rgba(255, 176, 0, 0.45);
}

/* ------------------------------------------------------------------ reset */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
   margin: 0;
   background: var(--bg);
   color: var(--text);
   font-family: var(--font-mono);
   font-size: 16px;
   line-height: 1.65;
   -webkit-font-smoothing: antialiased;
   text-shadow: 0 0 1px rgba(255, 176, 0, 0.12);
}

img { max-width: 100%; }
a { color: var(--amber); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--font-mono); }
code { font-size: 0.9em; color: var(--amber); }

::selection { background: var(--amber); color: #100e09; }

.sr-only {
   position: absolute;
   width: 1px; height: 1px;
   padding: 0; margin: -1px;
   overflow: hidden;
   clip: rect(0 0 0 0);
   white-space: nowrap;
   border: 0;
}

/* --------------------------------------------------------- CRT overlays */
/* vignette */
body::before {
   content: "";
   position: fixed;
   inset: 0;
   pointer-events: none;
   z-index: 9998;
   background: radial-gradient(120% 120% at 50% 40%,
               transparent 55%, rgba(0, 0, 0, 0.55) 100%);
}
/* scanlines */
body::after {
   content: "";
   position: fixed;
   inset: 0;
   pointer-events: none;
   z-index: 9999;
   background: repeating-linear-gradient(
               to bottom,
               rgba(0, 0, 0, 0) 0,
               rgba(0, 0, 0, 0) 2px,
               rgba(0, 0, 0, 0.22) 3px,
               rgba(0, 0, 0, 0.22) 4px);
   opacity: 0.55;
}

.skip-link {
   position: absolute;
   left: -999px;
   top: 0;
   background: var(--amber);
   color: #100e09;
   padding: 0.6rem 1rem;
   z-index: 100;
}
.skip-link:focus { left: 0; }

/* ------------------------------------------------------------ header/nav */
.site-header {
   position: sticky;
   top: 0;
   z-index: 50;
   background: rgba(11, 10, 7, 0.88);
   backdrop-filter: blur(8px);
   border-bottom: 1px solid var(--border);
}

.nav {
   max-width: var(--maxw);
   margin: 0 auto;
   padding: 0.7rem 1.5rem;
   display: flex;
   align-items: center;
   gap: 1.5rem;
}

.brand {
   display: inline-flex;
   align-items: center;
   gap: 0.55rem;
   color: var(--text);
   font-weight: 700;
   font-size: 1.02rem;
   text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-mark {
   color: var(--amber);
   text-shadow: var(--glow);
   font-weight: 700;
}
.brand-name { letter-spacing: 0.02em; }

.nav-links {
   list-style: none;
   display: flex;
   gap: 1.3rem;
   margin: 0 auto;
   padding: 0;
}
.nav-links a {
   color: var(--muted);
   font-size: 0.88rem;
   text-decoration: none;
}
.nav-links a::before { content: "["; color: var(--faint); }
.nav-links a::after  { content: "]"; color: var(--faint); }
.nav-links a:hover { color: var(--amber); text-decoration: none; }
.nav-links a:hover::before,
.nav-links a:hover::after { color: var(--amber); }

/* ----------------------------------------------------------------- buttons */
.btn {
   display: inline-block;
   padding: 0.65rem 1.3rem;
   border-radius: var(--radius);
   font-weight: 700;
   font-size: 0.9rem;
   text-decoration: none;
   transition: background 0.15s ease, color 0.15s ease,
               box-shadow 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; }

.btn-small { padding: 0.4rem 0.85rem; font-size: 0.8rem; }

.btn-primary {
   color: #100e09;
   background: var(--amber);
   box-shadow: var(--glow);
}
.btn-primary:hover {
   background: #ffc23a;
   box-shadow: 0 0 16px rgba(255, 176, 0, 0.65);
}

.btn-ghost {
   color: var(--amber);
   border: 1px solid var(--border-strong);
   background: transparent;
}
.btn-ghost:hover {
   background: rgba(255, 176, 0, 0.1);
   border-color: var(--amber);
}

/* -------------------------------------------------------------------- hero */
.hero {
   position: relative;
   text-align: center;
   padding: 5.5rem 1.5rem 3.5rem;
}

.hero-logo {
   display: block;
   width: 116px;
   height: 116px;
   margin: 0 auto 1.5rem;
   border-radius: 50%;
   filter: drop-shadow(0 0 22px rgba(255, 176, 0, 0.22));
}

.eyebrow {
   display: inline-block;
   margin: 0 0 1.4rem;
   color: var(--amber-dim);
   font-size: 0.85rem;
   letter-spacing: 0.16em;
   text-transform: uppercase;
}
.eyebrow::before { content: "$ "; color: var(--faint); }

.hero-title {
   margin: 0 auto 1.3rem;
   font-size: clamp(2.1rem, 6vw, 3.9rem);
   line-height: 1.1;
   letter-spacing: -0.01em;
   color: var(--amber);
   text-shadow: 0 0 16px rgba(255, 176, 0, 0.45),
                0 0 2px rgba(255, 176, 0, 0.9);
}

.hero-sub {
   margin: 0 auto 2rem;
   max-width: 62ch;
   color: var(--muted);
   font-size: 1rem;
}
.hero-sub strong { color: var(--text); }
.hero-sub em { color: var(--amber); font-style: normal; }

.hero-actions {
   display: flex;
   justify-content: center;
   gap: 0.9rem;
   flex-wrap: wrap;
   margin-bottom: 2.6rem;
}

/* -------------------------------------------------------------- terminal */
.terminal {
   max-width: 660px;
   margin: 0 auto;
   text-align: left;
   background: var(--panel);
   border: 1px solid var(--border-strong);
   border-radius: var(--radius);
   box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.4),
               0 0 40px rgba(255, 176, 0, 0.06),
               inset 0 0 60px rgba(255, 176, 0, 0.03);
   overflow: hidden;
}

.terminal-bar {
   display: flex;
   align-items: center;
   padding: 0.45rem 0.9rem;
   border-bottom: 1px solid var(--border);
   background: var(--bg-soft);
}
.terminal-bar::before {
   content: "";
   width: 0.55rem; height: 0.55rem;
   border-radius: 50%;
   margin-right: 0.9rem;
   background: var(--red);
   box-shadow: 1rem 0 0 #febc2e, 2rem 0 0 #28c840;
}
.terminal-title {
   color: var(--faint);
   font-size: 0.78rem;
   margin-left: 1.6rem;
}

.terminal-body {
   margin: 0;
   padding: 1.1rem 1.2rem 1.3rem;
   overflow-x: auto;
   white-space: pre-wrap;
   word-break: break-word;
   font-size: 0.86rem;
   line-height: 1.7;
   color: var(--text);
}
.terminal-body code { color: inherit; }

.p   { color: var(--green); }     /* shell prompt          */
.cm  { color: var(--faint); }     /* comments              */
.ok  { color: var(--amber); }     /* program output        */
.cursor::after {
   content: "\2588";               /* █ */
   color: var(--amber);
   animation: blink 1.05s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------------------------------------------------------------- chips */
.chips {
   list-style: none;
   display: flex;
   justify-content: center;
   gap: 0.6rem;
   margin: 2.8rem 0 0;
   padding: 0;
   flex-wrap: wrap;
}
.chips li {
   color: var(--muted);
   font-size: 0.78rem;
   letter-spacing: 0.02em;
   padding: 0.3rem 0.7rem;
   border: 1px solid var(--border);
   border-radius: var(--radius);
   background: rgba(255, 176, 0, 0.03);
}
.chips li::before { content: "· "; color: var(--amber-dim); }

/* ----------------------------------------------------------------- section */
.section {
   max-width: var(--maxw);
   margin: 0 auto;
   padding: 4rem 1.5rem;
}

.section-title {
   margin: 0 0 0.6rem;
   font-size: clamp(1.4rem, 3.2vw, 2rem);
   letter-spacing: -0.01em;
   color: var(--amber);
   text-shadow: 0 0 12px rgba(255, 176, 0, 0.35);
}
.section-title::before { content: "> "; color: var(--amber-dim); }
.section-lead {
   margin: 0 0 2.4rem;
   max-width: 68ch;
   color: var(--muted);
   font-size: 0.98rem;
}

/* ------------------------------------------------------------------ panes */
/* a "pane" is a terminal-style box with an optional title strip */
.panes {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
   gap: 1.1rem;
}
.panes-2 { grid-template-columns: 1.25fr 1fr; }
.panes-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.pane {
   position: relative;
   background: var(--panel);
   border: 1px solid var(--border);
   border-radius: var(--radius);
   padding: 1.5rem 1.4rem;
   transition: border-color 0.15s ease, background 0.15s ease,
               box-shadow 0.15s ease;
}
.pane:hover {
   border-color: var(--border-strong);
   background: var(--panel-hover);
   box-shadow: 0 0 24px rgba(255, 176, 0, 0.07);
}

/* title strip, text comes from the data-title attribute (CSS-only) */
.pane[data-title] { padding-top: 2.6rem; }
.pane[data-title]::before {
   content: attr(data-title);
   position: absolute;
   top: 0;
   left: 0;
   right: 0;
   padding: 0.35rem 0.9rem;
   border-bottom: 1px solid var(--border);
   background: var(--bg-soft);
   color: var(--faint);
   font-size: 0.74rem;
   letter-spacing: 0.06em;
}
.pane[data-title]::after {
   content: "▚";
   position: absolute;
   top: 0.35rem;
   right: 0.9rem;
   color: var(--border-strong);
   font-size: 0.74rem;
}

.pane-icon {
   display: block;
   color: var(--amber);
   font-size: 1.35rem;
   line-height: 1;
   margin-bottom: 0.7rem;
   text-shadow: var(--glow);
}
.pane h3 { margin: 0 0 0.5rem; font-size: 1.02rem; color: var(--text); }
.pane h3 a { color: var(--text); }
.pane h3 a:hover { color: var(--amber); }
.pane p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.pane p + p { margin-top: 0.7rem; }
.pane strong { color: var(--text); }

.pane-code {
   margin: 1rem 0 0;
   padding: 0.6rem 0.8rem;
   background: var(--bg);
   border: 1px solid var(--border);
   border-radius: var(--radius);
   font-size: 0.82rem;
   overflow-x: auto;
}
.pane-code .p { color: var(--green); }

.pane-actions { margin-top: 1.1rem; }

/* plain panes hold tables / asides, no title strip */
.pane-plain { padding: 1.5rem; }

/* --------------------------------------------------------------- quick start */
.steps {
   list-style: none;
   margin: 0;
   padding: 0;
   display: grid;
   gap: 1.2rem;
}
.steps li h3 {
   display: flex;
   align-items: center;
   gap: 0.7rem;
   margin: 0 0 0.7rem;
   font-size: 1rem;
   color: var(--text);
}
.step-num {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   width: 1.6rem;
   height: 1.6rem;
   border: 1px solid var(--amber);
   color: var(--amber);
   font-size: 0.82rem;
   font-weight: 700;
   box-shadow: var(--glow);
}
.steps pre {
   margin: 1rem 0 0;
   padding: 0.9rem 1rem;
   background: var(--bg);
   border: 1px solid var(--border);
   border-radius: var(--radius);
   overflow-x: auto;
   font-size: 0.82rem;
   line-height: 1.7;
   color: var(--text);
}
.steps pre .p { color: var(--green); }
.pane pre + p { margin-top: 0.9rem; }

.section-note { margin-top: 2rem; color: var(--faint); font-size: 0.9rem; }

/* ---------------------------------------------------------------- platforms */
.matrix {
   width: 100%;
   border-collapse: collapse;
   font-size: 0.88rem;
}
.matrix th, .matrix td {
   text-align: left;
   padding: 0.55rem 0.8rem;
   border-bottom: 1px dashed var(--border);
}
.matrix thead th {
   color: var(--faint);
   font-size: 0.74rem;
   text-transform: uppercase;
   letter-spacing: 0.08em;
   border-bottom: 1px solid var(--border-strong);
}
.matrix tbody tr:last-child td { border-bottom: none; }
.matrix tbody tr:hover td { background: rgba(255, 176, 0, 0.04); }
.matrix td:first-child { color: var(--amber); font-weight: 700; }

.pane-note h3 { color: var(--amber); }
.pane-note code { color: var(--text); }

/* ------------------------------------------------------------------ footer */
.site-footer {
   border-top: 1px solid var(--border);
   background: var(--bg-soft);
   padding: 3rem 1.5rem 2rem;
}
.footer-grid {
   max-width: var(--maxw);
   margin: 0 auto;
   display: grid;
   grid-template-columns: 2fr 1fr 1fr;
   gap: 2rem;
}
.footer-brand {
   font-weight: 700;
   margin: 0 0 0.5rem;
   color: var(--amber);
   text-shadow: var(--glow);
}
.footer-heading {
   margin: 0 0 0.7rem;
   color: var(--faint);
   font-size: 0.74rem;
   text-transform: uppercase;
   letter-spacing: 0.1em;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.45rem; }
.site-footer p { color: var(--muted); font-size: 0.88rem; margin: 0 0 0.4rem; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--amber); }

.footer-note {
   max-width: var(--maxw);
   margin: 2.4rem auto 0;
   padding-top: 1.4rem;
   border-top: 1px dashed var(--border);
   color: var(--faint);
   font-size: 0.82rem;
}

/* ------------------------------------------------------------- responsive */
@media (max-width: 860px) {
   .panes-2, .panes-3 { grid-template-columns: 1fr; }
   .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
   .nav-links { display: none; }
   .hero { padding-top: 4rem; }
}

/* --------------------------------------------------------- reduced motion */
@media (prefers-reduced-motion: reduce) {
   html { scroll-behavior: auto; }
   *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
   }
   /* keep the scanlines static but visible */
}