/* ============================================================
   BACKYARD TECH — Design Tokens v2
   Monochrome premium. B&W + grays only.
   Redesign v2 — 2026-04-20
   ============================================================ */


/* ── IBM Plex Serif ─────────────────────────────────────────── */
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-cyrillic-ext-w400.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-cyrillic-w400.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-latin-ext-w400.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-latin-w400.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-cyrillic-ext-w600.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-cyrillic-w600.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-latin-ext-w600.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Serif';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-serif/ibm-plex-serif-latin-w600.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}


/* ── IBM Plex Sans (variable: 100–700) ──────────────────────── */
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-sans/ibm-plex-sans-cyrillic-ext-variable.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-sans/ibm-plex-sans-cyrillic-variable.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-sans/ibm-plex-sans-latin-ext-variable.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-sans/ibm-plex-sans-latin-variable.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}


/* ── IBM Plex Mono ──────────────────────────────────────────── */
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-cyrillic-ext-w400.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-cyrillic-w400.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-latin-ext-w400.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-latin-w400.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-cyrillic-ext-w500.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-cyrillic-w500.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-latin-ext-w500.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/static/fonts/ibm-plex-mono/ibm-plex-mono-latin-w500.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}


/* ============================================================
   DARK THEME (default)
   ============================================================ */
:root {
  color-scheme: dark;

  /* ── Colors ──────────────────────────────────────────────── */
  --bg:            #0A0A0A;
  --bg-elevated:   #111111;
  --bg-subtle:     #151515;
  --border:        rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text:          #F5F5F5;
  --text-muted:    #A8A8A8;
  --text-subtle:   #666666;
  --accent:        #FFFFFF;
  --color-error:   #D97A7A;  /* desaturated coral — only used for form validation states */

  /* ── Font families ───────────────────────────────────────── */
  --font-serif: 'IBM Plex Serif', Georgia, serif;
  --font-sans:  'IBM Plex Sans', system-ui, sans-serif;
  --font-mono:  'IBM Plex Mono', 'Courier New', monospace;

  /* ── Typography scale (Major Third 1.25) ─────────────────── */
  --fs-display:  clamp(48px, 7vw, 96px);
  --fs-h1:       clamp(36px, 5vw, 64px);
  --fs-h2:       clamp(28px, 3.5vw, 40px);
  --fs-h3:       24px;
  --fs-h4:       20px;
  --fs-body-lg:  18px;
  --fs-body:     16px;
  --fs-body-sm:  14px;
  --fs-caption:  13px;
  --fs-micro:    11px;

  /* ── Line heights ─────────────────────────────────────────── */
  --lh-display:  1.05;
  --lh-h1:       1.1;
  --lh-h2:       1.2;
  --lh-h3:       1.3;
  --lh-h4:       1.4;
  --lh-body:     1.6;
  --lh-caption:  1.4;
  --lh-micro:    1.3;

  /* ── Letter spacing ───────────────────────────────────────── */
  --ls-tight:    -0.02em;
  --ls-normal:   0em;
  --ls-mono:     0.06em;
  --ls-wide:     0.1em;

  /* ── Spacing (4px base) ───────────────────────────────────── */
  --space-1:   4px;
  --space-2:   8px;
  --space-3:   12px;
  --space-4:   16px;
  --space-5:   24px;
  --space-6:   32px;
  --space-7:   48px;
  --space-8:   64px;
  --space-9:   96px;
  --space-10:  128px;
  --space-11:  160px;

  /* ── Border radii ─────────────────────────────────────────── */
  --radius-sm:   4px;
  --radius-md:   12px;
  --radius-lg:   20px;
  --radius-full: 999px;

  /* ── Transitions ──────────────────────────────────────────── */
  --transition-fast:  150ms ease;
  --transition-base:  200ms ease;
  --transition-slow:  300ms ease;
  --transition-theme: 300ms ease;

  /* ── Layout ───────────────────────────────────────────────── */
  --container-max: 1280px;
  --container-pad: clamp(32px, 5vw, 48px);
  --header-h:      72px;
}


/* ============================================================
   LIGHT THEME OVERRIDES — [data-theme="light"] on <html>
   ============================================================ */
[data-theme="light"] {
  color-scheme: light;

  --bg:            #FAFAFA;
  --bg-elevated:   #FFFFFF;
  --bg-subtle:     #F0F0F0;
  --border:        rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.16);
  --text:          #0A0A0A;
  --text-muted:    #555555;
  --text-subtle:   #999999;
  --accent:        #000000;
  --color-error:   #B33A3A;
}