@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400;1,700&family=DM+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

/* =========================================================================
   Little Octopus — Colors & Type
   Claude-esque digital paper aesthetic. Warm, quiet, ink-on-paper.
   ========================================================================= */

/* Fonts — Google Fonts: Playfair Display (serif) + DM Sans (sans). */

:root {
  /* ---------------------------------------------------------------------
     COLOR SYSTEM
     --------------------------------------------------------------------- */

  /* Base paper + ink */
  --paper:            #FAF9F6;  /* Warm Paper — primary background */
  --paper-2:          #F3F0E8;  /* Slightly deeper paper — sections, cards on paper */
  --paper-3:          #EAE5D9;  /* Edge tones, dividers-as-fill */
  --ink:              #2D2926;  /* Ink — primary text + structure */
  --ink-2:            #4B4641;  /* Secondary ink — body at ease */
  --ink-3:            #7A7269;  /* Tertiary ink — captions, meta */
  --ink-4:            #B8B0A3;  /* Quiet ink — placeholders, disabled */

  /* Accent — Octopus Orange */
  --accent:           #FF7A59;  /* Octopus Orange — primary accent */
  --accent-hover:     #E8613F;  /* Pressed / hover darker */
  --accent-soft:      #FFE8DF;  /* Wash — pill backgrounds, highlights */
  --accent-ink:       #B8431E;  /* Deepest orange — for text on accent-soft */

  /* Semantic — muted, paper-friendly */
  --success:          #6B8E5A;  /* Sage Green */
  --success-soft:     #E6EADC;
  --warning:          #C28F3D;  /* Amber ochre */
  --warning-soft:     #F5EAD1;
  --danger:           #9B3A2F;  /* Deep Clay Red */
  --danger-soft:      #F3DCD5;
  --info:             #3F6A8A;  /* Overcast blue */
  --info-soft:        #DDE6EE;

  /* Dark surfaces (for terminal/demo UI only) */
  --night:            #1A1815;  /* Near-black with warm bias */
  --night-2:          #272320;
  --night-3:          #3A342F;
  --night-ink:        #EAE5D9;
  --night-ink-2:      #B8B0A3;

  /* Semantic aliases */
  --bg:               var(--paper);
  --bg-2:             var(--paper-2);
  --fg:               var(--ink);
  --fg-2:             var(--ink-2);
  --fg-3:             var(--ink-3);
  --fg-muted:         var(--ink-4);
  --border:           #E3DED2;
  --border-strong:    #C9C2B4;
  --divider:          #EDE8DC;

  /* ---------------------------------------------------------------------
     TYPOGRAPHY
     --------------------------------------------------------------------- */

  /* Families — 100% system fonts */
  --font-serif:       'Playfair Display', Georgia, 'Times New Roman', ui-serif, serif;
  --font-sans:        'DM Sans', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono:        ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas,
                      'Liberation Mono', monospace;

  /* Display (serif, Chinese-first) */
  --display-1:        700 clamp(3.5rem, 6vw, 5.75rem)/1.15   var(--font-serif);
  --display-2:        700 clamp(2.75rem, 4.5vw, 4rem)/1.2    var(--font-serif);
  --h1:               700 clamp(2.25rem, 3.5vw, 3rem)/1.25   var(--font-serif);
  --h2:               600 clamp(1.75rem, 2.4vw, 2.25rem)/1.3 var(--font-serif);
  --h3:               600 1.375rem/1.4                        var(--font-serif);
  --h4:               600 1.125rem/1.45                       var(--font-sans);

  /* Body (sans) */
  --body-lg:          400 1.125rem/1.7  var(--font-sans);
  --body:             400 1rem/1.7      var(--font-sans);
  --body-sm:          400 0.875rem/1.65 var(--font-sans);
  --caption:          500 0.75rem/1.5   var(--font-sans);

  /* Utility */
  --eyebrow:          600 0.75rem/1.4   var(--font-sans);   /* uppercase, tracked */
  --mono:             400 0.875rem/1.6  var(--font-mono);
  --mono-sm:          400 0.75rem/1.55  var(--font-mono);

  /* Tracking */
  --track-tight:      -0.02em;
  --track-normal:     0;
  --track-wide:       0.08em;
  --track-eyebrow:    0.18em;

  /* ---------------------------------------------------------------------
     SPACING & SIZING (8px base, with 4px half-steps)
     --------------------------------------------------------------------- */
  --sp-0:    0;
  --sp-1:    4px;
  --sp-2:    8px;
  --sp-3:    12px;
  --sp-4:    16px;
  --sp-5:    24px;
  --sp-6:    32px;
  --sp-7:    48px;
  --sp-8:    64px;
  --sp-9:    96px;
  --sp-10:  128px;
  --sp-11:  160px;

  /* ---------------------------------------------------------------------
     RADII
     --------------------------------------------------------------------- */
  --r-xs:    4px;
  --r-sm:    8px;
  --r-md:   12px;
  --r-lg:   16px;
  --r-xl:   24px;
  --r-2xl:  32px;
  --r-pill: 999px;

  /* ---------------------------------------------------------------------
     SHADOWS — soft, paper-like, never slick
     --------------------------------------------------------------------- */
  --shadow-xs:  0 1px 2px rgba(45, 41, 38, 0.04);
  --shadow-sm:  0 2px 6px rgba(45, 41, 38, 0.05), 0 1px 2px rgba(45, 41, 38, 0.04);
  --shadow-md:  0 8px 20px rgba(45, 41, 38, 0.06), 0 2px 4px rgba(45, 41, 38, 0.04);
  --shadow-lg:  0 20px 40px rgba(45, 41, 38, 0.08), 0 4px 10px rgba(45, 41, 38, 0.04);
  --shadow-xl:  0 32px 64px rgba(45, 41, 38, 0.12), 0 8px 20px rgba(45, 41, 38, 0.06);

  --shadow-accent: 0 8px 24px rgba(255, 122, 89, 0.28);
  --shadow-inset:  inset 0 1px 2px rgba(45, 41, 38, 0.06);

  /* ---------------------------------------------------------------------
     MOTION
     --------------------------------------------------------------------- */
  --ease-out:     cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-in-out:  cubic-bezier(0.65, 0, 0.35, 1);
  --ease-emphatic:cubic-bezier(0.22, 1, 0.36, 1);

  --dur-fast:   120ms;
  --dur-base:   220ms;
  --dur-slow:   420ms;
  --dur-xslow:  720ms;

  /* ---------------------------------------------------------------------
     LAYOUT
     --------------------------------------------------------------------- */
  --max-content:  1200px;
  --max-narrow:   760px;
  --max-wide:     1440px;
  --nav-h:        68px;
}

/* =========================================================================
   SEMANTIC STYLES — apply to tags directly for convenient scaffolding
   ========================================================================= */

html, body {
  background: var(--bg);
  color: var(--fg);
  font: var(--body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'kern', 'liga';
}

h1 { font: var(--h1);  color: var(--ink); letter-spacing: var(--track-tight); margin: 0 0 var(--sp-5); }
h2 { font: var(--h2);  color: var(--ink); letter-spacing: var(--track-tight); margin: 0 0 var(--sp-4); }
h3 { font: var(--h3);  color: var(--ink); margin: 0 0 var(--sp-3); }
h4 { font: var(--h4);  color: var(--ink); margin: 0 0 var(--sp-3); }

p  { font: var(--body); color: var(--ink-2); margin: 0 0 var(--sp-4); }

small, .caption { font: var(--caption); color: var(--ink-3); }

code, pre, kbd, samp { font-family: var(--font-mono); }

a {
  color: var(--accent-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur-base) var(--ease-out);
}
a:hover { color: var(--accent); }

/* Eyebrow label — used above section headings and hero pills */
.eyebrow {
  font: var(--eyebrow);
  letter-spacing: var(--track-eyebrow);
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Accent pill — the recurring orange badge from the landing hero */
.accent-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 6px 14px;
  border-radius: var(--r-pill);
  background: var(--accent-soft);
  color: var(--accent-ink);
  font: 600 0.8125rem/1.4 var(--font-sans);
  letter-spacing: 0.01em;
}

/* Chinese display — mixed with inline English runs (AI, Claude, RCE) that stay in sans */
.display-zh { font: var(--display-1); color: var(--ink); letter-spacing: -0.01em; }
.display-zh .en { font-family: var(--font-sans); font-weight: 700; font-style: italic; }
.display-zh .accent { color: var(--accent); }