/* ========================================
   MIRA — base.css
   Shared design foundation used by every page on the site.
   Load order: base.css FIRST, then any page-specific stylesheet.
   The landing deck (index.html) additionally loads landing.css
   on top of base.css to reassert deck-specific overrides.
   ======================================== */

/* Font Declarations */
@font-face {
   font-family: 'IBM Plex Mono';
   src: url('assets/fonts/IBM_Plex_Mono.woff2') format('woff2');
   font-weight: 100 700;
   font-style: normal;
   font-display: swap;
}

@font-face {
   font-family: 'Roboto';
   src: url('assets/fonts/Roboto.woff2') format('woff2');
   font-weight: 100 900;
   font-style: normal;
   font-display: swap;
}

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

*, *::before, *::after {
   box-sizing: border-box;
   margin: 0;
   padding: 0;
}

html {
   font-size: 16px;
   scroll-behavior: smooth;
}

:root {
   --accent: #0f0;
   --accent-rgb: 0 255 0;
   --accent-transition: 0.9s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
   background-color: #000;
   color: #e4eff3;
   font-family: 'Roboto', 'Avenir Next', 'Segoe UI', 'Helvetica', 'Arial', sans-serif;
   font-weight: 100;
   line-height: 1.75;
   overflow-x: hidden;
   overflow-y: auto;
   min-height: 100vh;
}

/* Body-level accent — every page hardcodes data-accent in HTML,
   and this cascade drives frame, furniture, header, button glows, etc. */
body[data-accent="magenta"] { --accent: #c0f; --accent-rgb: 204 0 255; }
body[data-accent="cyan"]    { --accent: #0ff; --accent-rgb: 0 255 255; }
body[data-accent="lime"]    { --accent: #0f0; --accent-rgb: 0 255 0; }
body[data-accent="yellow"]  { --accent: #ff0; --accent-rgb: 255 255 0; }
body[data-accent="pink"]    { --accent: #f0a; --accent-rgb: 255 0 170; }

/* ========================================
   AMBIENT LAYERS
   Grain (film) + dot grid (architecture) + accent vignette (atmosphere).
   Three coordinated substrates behind all content.
   ======================================== */

.ambient-grain,
.ambient-grid,
.ambient-vignette {
   position: fixed;
   inset: 0;
   pointer-events: none;
}

.ambient-grain {
   z-index: 1;
   opacity: 0.06;
   mix-blend-mode: overlay;
   background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
   background-size: 200px 200px;
   animation: grain-drift 8s steps(6) infinite;
}

@keyframes grain-drift {
   0%   { transform: translate(0, 0); }
   20%  { transform: translate(-2%, 1%); }
   40%  { transform: translate(1%, -2%); }
   60%  { transform: translate(-1%, -1%); }
   80%  { transform: translate(2%, 1%); }
   100% { transform: translate(0, 0); }
}

.ambient-grid {
   z-index: 2;
   opacity: 0.5;
   background-image: radial-gradient(
      circle at 1px 1px,
      rgba(228, 239, 243, 0.08) 1px,
      transparent 0
   );
   background-size: 32px 32px;
}

.ambient-vignette {
   z-index: 3;
   background: radial-gradient(
      ellipse 75% 65% at 50% 50%,
      transparent 0%,
      transparent 48%,
      rgb(var(--accent-rgb) / 0.07) 78%,
      rgb(var(--accent-rgb) / 0.14) 100%
   );
   transition: background var(--accent-transition);
}

/* ========================================
   SKIP NAVIGATION
   ======================================== */

.skip-nav {
   position: absolute;
   left: -9999px;
   top: auto;
   z-index: 200;
   padding: 8px 16px;
   background: var(--accent);
   color: #000;
   font-weight: 600;
   text-decoration: none;
   border-radius: 4px;
}

.skip-nav:focus {
   left: 10px;
   top: 10px;
}

/* ========================================
   SITE HEADER
   Logo + auth buttons. Fixed to the top, spans the viewport.
   ======================================== */

.site-header {
   position: fixed;
   top: 0;
   left: 0;
   right: 0;
   z-index: 15;
   display: flex;
   align-items: flex-start;
   justify-content: space-between;
   padding: 48px 56px;
   pointer-events: none;
}

.site-logo {
   pointer-events: auto;
}

.site-logo img {
   height: 28px;
   width: auto;
}

.site-auth {
   display: flex;
   align-items: center;
   gap: 12px;
   pointer-events: auto;
}

.site-auth-btn {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   height: 40px;
   padding: 0 24px;
   font-family: 'IBM Plex Mono', monospace;
   font-size: 0.78rem;
   font-weight: 500;
   letter-spacing: 0.2em;
   text-transform: uppercase;
   text-decoration: none;
   border-radius: 2px;
   transition: background 0.25s ease,
               color 0.25s ease,
               border-color 0.25s ease,
               box-shadow 0.3s ease,
               transform 0.15s ease;
}

.site-auth-btn--secondary {
   color: rgba(228, 239, 243, 0.88);
   background: transparent;
   border: 1px solid rgba(228, 239, 243, 0.32);
}

.site-auth-btn--secondary:hover {
   color: #000;
   background: rgba(228, 239, 243, 0.92);
   border-color: rgba(228, 239, 243, 0.92);
}

.site-auth-btn--primary {
   color: #000;
   background: var(--accent);
   border: 1px solid var(--accent);
   box-shadow: 0 0 20px rgb(var(--accent-rgb) / 0.35);
}

.site-auth-btn--primary:hover {
   transform: translateY(-1px);
   box-shadow: 0 0 32px rgb(var(--accent-rgb) / 0.6);
}

.site-auth-btn:active {
   transform: translateY(0);
}

.site-auth-btn:focus-visible {
   outline: 2px solid #fff;
   outline-offset: 3px;
}

.site-auth-btn--ghost {
   color: rgba(228, 239, 243, 0.95);
   background: transparent;
   border: 1px solid transparent;
   padding: 0 16px;
   opacity: 0.5;
   transition: opacity 0.25s ease;
}

.site-auth-btn--ghost:hover {
   opacity: 1;
}

/* ========================================
   PAGE FRAME
   5px accent-colored border hugging the viewport edge.
   Used by most pages (landing, auth, errors, docs).
   Blog pages intentionally omit this element.
   ======================================== */

.page-frame {
   position: fixed;
   inset: 0;
   border: 5px solid var(--accent);
   pointer-events: none;
   z-index: 10;
   transition: border-color var(--accent-transition);
}

/* ========================================
   FRAME FURNITURE
   L-shaped corner registration marks + optional slide numeral.
   Paints positional language onto the frame.
   ======================================== */

.frame-furniture {
   position: fixed;
   inset: 0;
   z-index: 11;
   pointer-events: none;
   font-family: 'IBM Plex Mono', monospace;
   font-size: 0.65rem;
   text-transform: uppercase;
   letter-spacing: 0.2em;
   color: rgb(var(--accent-rgb) / 0.55);
   transition: color var(--accent-transition);
}

.frame-mark {
   position: absolute;
   width: 18px;
   height: 18px;
   border: 1px solid currentColor;
}

.frame-mark--tl { top: 20px;    left: 20px;    border-right: 0; border-bottom: 0; }
.frame-mark--tr { top: 20px;    right: 20px;   border-left: 0;  border-bottom: 0; }
.frame-mark--bl { bottom: 20px; left: 20px;    border-right: 0; border-top: 0; }
.frame-mark--br { bottom: 20px; right: 20px;   border-left: 0;  border-top: 0; }

.frame-position {
   position: absolute;
   bottom: 48px;
   left: 56px;
   display: flex;
   align-items: baseline;
   gap: 0.55rem;
   line-height: 1;
}

.frame-numeral {
   font-family: 'Roboto', sans-serif;
   font-size: 5rem;
   font-weight: 100;
   line-height: 1;
   letter-spacing: -0.025em;
   color: rgb(var(--accent-rgb) / 0.32);
   font-variant-numeric: tabular-nums;
   transition: color var(--accent-transition);
}

.frame-total {
   font-family: 'IBM Plex Mono', monospace;
   font-size: 0.72rem;
   letter-spacing: 0.14em;
   color: rgb(var(--accent-rgb) / 0.48);
   font-variant-numeric: tabular-nums;
   transition: color var(--accent-transition);
}

/* ========================================
   REDUCED MOTION
   Kill ambient drift and hover transitions for motion-sensitive users.
   Page-specific CSS may extend this block with page-specific selectors.
   ======================================== */

@media (prefers-reduced-motion: reduce) {
   .ambient-grain,
   .ambient-vignette,
   .site-auth-btn,
   .page-frame,
   .frame-furniture,
   .frame-numeral,
   .frame-total {
      transition: none !important;
      animation: none !important;
   }
}

/* ========================================
   MOBILE: shared page chrome overrides
   ======================================== */

@media (max-width: 768px) {
   /* Frame and furniture drop on mobile — too visually heavy on phones */
   .page-frame,
   .frame-furniture,
   .ambient-vignette {
      display: none;
   }

   .site-header {
      padding: 16px 20px;
      align-items: center;
   }

   .site-logo img {
      height: 20px;
   }

   .site-auth {
      gap: 8px;
   }

   .site-auth-btn {
      height: 36px;
      padding: 0 16px;
      font-size: 0.7rem;
      letter-spacing: 0.16em;
   }

   /* GitHub link hides on mobile — prioritize Log in / Sign up for narrow screens */
   .site-auth-btn--ghost {
      display: none;
   }
}

/* ========================================
   LARGE DESKTOP
   ======================================== */

@media (min-width: 1400px) {
   .frame-numeral {
      font-size: 5.75rem;
   }

   .frame-mark {
      width: 22px;
      height: 22px;
   }

   .frame-position {
      bottom: 54px;
      left: 64px;
   }
}