/* ==========================================================================
   SIA ARQUITETURA — Colors & Type
   Monochromatic architectural palette. Montserrat (display) + Inter (body).
   ========================================================================== */

/* ---------- LOCAL BRAND FONTS ----------
   Self-hosted. Paths are relative to this stylesheet (project root).
   Weights shipped: Inter 300/400; Montserrat 600/700/800 + 300 italic.
*/
@font-face {
  font-family: 'Inter';
  font-weight: 300;
  font-style: normal;
  font-display: swap;
  src: url('fonts/Inter-Light.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  src: url('fonts/Inter-Regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Montserrat';
  font-weight: 600;
  font-style: normal;
  font-display: swap;
  src: url('fonts/Montserrat-SemiBold.woff2') format('woff2');
}
@font-face {
  font-family: 'Montserrat';
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  src: url('fonts/Montserrat-Bold.woff2') format('woff2');
}
@font-face {
  font-family: 'Montserrat';
  font-weight: 800;
  font-style: normal;
  font-display: swap;
  src: url('fonts/Montserrat-ExtraBold.woff2') format('woff2');
}
@font-face {
  font-family: 'Montserrat';
  font-weight: 300;
  font-style: italic;
  font-display: swap;
  src: url('fonts/Montserrat-LightItalic.woff2') format('woff2');
}

:root {
  /* ---------- BASE PALETTE ---------- */
  --sia-carvao:        #232323;  /* charcoal — dominant dark ground, text on light */
  --sia-cinza-logo:    #5C5C5C;  /* the brand's ONLY accent. Logo gray. */
  --sia-cinza-medio:   #7A7A7A;  /* secondary text on light */
  --sia-cinza-claro:   #AEABAB;  /* muted/caption text, dividers on dark */
  --sia-concreto:      #EBEBEA;  /* concrete — default light ground */
  --sia-branco:        #F5F5F4;  /* warm off-white — text on dark, highlight ground */
  --sia-branco-puro:   #FFFFFF;  /* rare; use for crisp cards on concrete */
  --sia-linha:         #D8D5D0;  /* hairline dividers on light */
  --sia-pedra:         #9E9690;  /* photographic warm-stone mid-tone */

  /* Dark-mode surface tokens (used inside dark compositions) */
  --sia-dark-line:     #333333;  /* hairline on carvao */
  --sia-dark-line-soft:#2A2A2A;

  /* ---------- SEMANTIC SURFACES ---------- */
  --bg:                var(--sia-concreto);
  --bg-elevated:       var(--sia-branco-puro);
  --bg-dark:           var(--sia-carvao);
  --bg-accent:         var(--sia-cinza-logo);

  --fg:                var(--sia-carvao);
  --fg-muted:          var(--sia-cinza-medio);
  --fg-soft:           var(--sia-cinza-claro);
  --fg-on-dark:        var(--sia-branco);
  --fg-on-dark-muted:  var(--sia-cinza-claro);

  --border:            var(--sia-linha);
  --border-dark:       var(--sia-dark-line);

  /* ---------- TYPE FAMILIES ---------- */
  --font-display: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  --font-body:    'Inter', 'Helvetica Neue', Arial, sans-serif;

  /* Weights — STRICT USAGE
     Display/titles: 800 ExtraBold (never lower than 700)
     UI labels/tags: 600–700
     Quotes/light display: 300
     Body: 300–400 (Inter)
  */
  --w-light:       300;
  --w-regular:     400;
  --w-medium:      500;
  --w-semibold:    600;
  --w-bold:        700;
  --w-extrabold:   800;

  /* ---------- TYPE SCALE ---------- */
  /* Montserrat display scale — ALWAYS UPPERCASE, tight tracking */
  --fs-display:    clamp(48px, 7vw, 96px);
  --fs-h1:         clamp(36px, 5vw, 64px);
  --fs-h2:         clamp(22px, 3vw, 36px);
  --fs-h3:         28px;
  --fs-h4:         20px;

  /* Body */
  --fs-body-lg:    17px;
  --fs-body:       15px;
  --fs-body-sm:    13px;
  --fs-caption:    12px;
  --fs-micro:      10px;   /* tags/labels/kickers — always uppercase + tracking */

  /* Tracking — the SIA signature
     Titles run TIGHT. Labels run WIDE.
  */
  --tr-tight:      -0.03em;
  --tr-snug:       -0.02em;
  --tr-normal:     0;
  --tr-wide:       0.06em;
  --tr-wider:      0.14em;
  --tr-widest:     0.22em;   /* hero subtitles, capa labels */

  /* ---------- LINE HEIGHT ---------- */
  --lh-display:    0.92;
  --lh-heading:    1.05;
  --lh-body:       1.65;
  --lh-tight:      1;

  /* ---------- SPACING (8pt-based, but generous — "10% margin" rule) ---------- */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 20px;
  --s-6: 24px;
  --s-8: 32px;
  --s-10:40px;
  --s-12:48px;
  --s-16:64px;
  --s-20:80px;

  /* ---------- RADII ----------
     SIA is square. Angulos retos. NEVER use pill/fully-rounded on branded surfaces.
     These exist for optional micro-smoothing only.
  */
  --r-0: 0px;      /* default — use this */
  --r-1: 2px;      /* micro-smoothing on tiny UI only */
  --r-2: 4px;

  /* ---------- HAIRLINES / BORDERS ---------- */
  --border-hairline: 1px solid var(--border);
  --border-hairline-dark: 1px solid var(--border-dark);
  --border-accent-left: 3px solid var(--sia-carvao);     /* signature quote/rule marker */
  --border-accent-left-soft: 3px solid var(--sia-cinza-claro);

  /* ---------- SIGNATURE VERTICAL BAR ----------
     6px vertical bar in cinza-logo — appears on every dark-ground slide.
     Apply as a pseudo-element with this width/color.
  */
  --sig-bar-width: 6px;
  --sig-bar-color: var(--sia-cinza-logo);

  /* ---------- MOTION ---------- */
  --easing:        cubic-bezier(0.4, 0, 0.2, 1);  /* calm, no bounce */
  --dur-fast:      150ms;
  --dur-base:      220ms;
  --dur-slow:      400ms;
}

/* ==========================================================================
   BASE RESETS (opt-in — include this stylesheet and it applies)
   ========================================================================== */

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-body);
  font-weight: var(--w-regular);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg);
  background: var(--bg);
}

/* ==========================================================================
   SEMANTIC TYPE CLASSES — use these directly
   ========================================================================== */

.sia-display {
  font-family: var(--font-display);
  font-weight: var(--w-extrabold);
  font-size: var(--fs-display);
  line-height: var(--lh-display);
  letter-spacing: var(--tr-tight);
  text-transform: uppercase;
}

.sia-h1 {
  font-family: var(--font-display);
  font-weight: var(--w-extrabold);
  font-size: var(--fs-h1);
  line-height: var(--lh-heading);
  letter-spacing: var(--tr-snug);
  text-transform: uppercase;
}

.sia-h2 {
  font-family: var(--font-display);
  font-weight: var(--w-extrabold);
  font-size: var(--fs-h2);
  line-height: var(--lh-heading);
  letter-spacing: var(--tr-snug);
  text-transform: uppercase;
}

.sia-h3 {
  font-family: var(--font-display);
  font-weight: var(--w-bold);
  font-size: var(--fs-h3);
  line-height: 1.15;
  letter-spacing: var(--tr-snug);
  text-transform: uppercase;
}

.sia-subhead {
  font-family: var(--font-display);
  font-weight: var(--w-regular);
  font-size: 16px;
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--fg-muted);
}

.sia-kicker {
  font-family: var(--font-display);
  font-weight: var(--w-bold);
  font-size: var(--fs-micro);
  letter-spacing: var(--tr-widest);
  text-transform: uppercase;
  color: var(--sia-cinza-logo);
}

.sia-label {
  font-family: var(--font-display);
  font-weight: var(--w-bold);
  font-size: var(--fs-micro);
  letter-spacing: var(--tr-wider);
  text-transform: uppercase;
}

.sia-body {
  font-family: var(--font-body);
  font-weight: var(--w-regular);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg);
}

.sia-body-light {
  font-family: var(--font-body);
  font-weight: var(--w-light);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg-muted);
}

.sia-quote {
  font-family: var(--font-display);
  font-weight: var(--w-light);
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: 0;
}

.sia-caption {
  font-family: var(--font-body);
  font-weight: var(--w-regular);
  font-size: var(--fs-caption);
  color: var(--fg-muted);
}

/* ==========================================================================
   SIGNATURE SURFACES
   ========================================================================== */

/* Dark ground with the 6px vertical signature bar on the left */
.sia-dark-surface {
  background: var(--sia-carvao);
  color: var(--fg-on-dark);
  position: relative;
}
.sia-dark-surface::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--sig-bar-width);
  background: var(--sig-bar-color);
}

/* Card on light ground */
.sia-card {
  background: var(--bg-elevated);
  border: var(--border-hairline);
  padding: var(--s-6);
}

/* Quote card — left rule in carvao is the brand signature */
.sia-quote-card {
  background: var(--bg-elevated);
  border: var(--border-hairline);
  border-left: var(--border-accent-left);
  padding: var(--s-5) var(--s-6);
}