/*****************************************************
HEADER STUDIO
Typography-forward dark header with line grid + accent bar.
Three tiers (hero, section, banner) × five filter modes.

Usage: set header-image in page front matter to activate.
See _includes/layout/header-studio.html for full parameter docs.

Accent color inherits --accent-primary from base.css.
Font families inherit from base.css variables.
*****************************************************/

/* --- Base structure --- */
.header-studio {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: #161618;
  box-sizing: content-box;
  padding-bottom: 120px;
}

.header-studio::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 350px;
  background: linear-gradient(to bottom, transparent, #2a2d31);
  pointer-events: none;
  z-index: 5;
}

.header-studio-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center right;
  opacity: 0.28;
}

.header-studio-grid {
  position: absolute;
  inset: 0;
  opacity: 0.025;
  background-image:
    linear-gradient(rgba(255,255,255,1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,1) 1px, transparent 1px);
  background-size: 40px 40px;
}

.header-studio-bar {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-primary);
}

.header-studio-content {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  padding: 3rem 5rem;
  margin-left: 3rem;
  border-left: 2px solid color-mix(in srgb, var(--accent-primary) 40%, transparent);
}

/* --- Hero tier: eyebrow, large serif title, divider, subtitle --- */
.header-studio--hero {
  display: flex;
  align-items: flex-start;
  padding-top: 22vh;
  padding-bottom: 0;
}

.header-studio--hero .header-studio-content {
  height: auto;
}

.header-studio-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--accent-primary);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.header-studio h1 {
  font-family: var(--font-serif) !important;
  font-size: clamp(4.8rem, 10.8vw, 7.8rem) !important;
  font-weight: 400 !important;
  color: white !important;
  line-height: 1.0;
  margin-bottom: 0.4rem !important;
  text-shadow:
    0 0 20px rgba(0, 0, 0, 0.55),
    0 0 50px rgba(0, 0, 0, 0.30) !important;
  text-indent: -0.06em;
  letter-spacing: 0 !important;
}

.header-studio-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}

.header-studio-divider-line {
  height: 1px;
  width: 60px;
  background: rgba(255,255,255,0.12);
}

.header-studio-divider span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.28);
  text-transform: uppercase;
}

.header-studio p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.45);
  line-height: 1.75;
  font-weight: 300;
  letter-spacing: 0.06em;
  margin-bottom: 0;
  max-width: 540px;
}

/* Reduce gap between header and first content heading */
.header-studio ~ .container h1:first-child {
  margin-top: 1rem;
}

.header-studio--section ~ .container h2:first-child,
.header-studio--banner ~ .container h2:first-child {
  margin-top: 1.5rem;
}


/* --- Tier: Section (mid-level pages, ~60vh) --- */
.header-studio--section {
  height: 60vh;
  padding-bottom: 60px;
}

.header-studio--section::after {
  height: 180px;
}

.header-studio--section .header-studio-content {
  margin-left: 2rem;
  padding: 2rem 3rem;
  max-width: 40%;
  border-left-width: 2px;
}

.header-studio--section h1 {
  font-size: clamp(2.4rem, 3.2vw, 3.5rem) !important;
  margin-bottom: 0 !important;
  margin-top: 0 !important;
  text-shadow:
    0 0 25px rgba(0, 0, 0, 0.95),
    0 0 55px rgba(0, 0, 0, 0.75),
    0 0 90px rgba(0, 0, 0, 0.45) !important;
}

.header-studio--section .header-studio-grid {
  opacity: 0.015;
}

.header-studio--section .header-studio-bg {
  opacity: 0.18;
}


/* --- Tier: Banner (internal pages, ~22vh) --- */
.header-studio--banner {
  height: 22vh;
  padding-bottom: 0;
}

.header-studio--banner::after {
  height: 100px;
}

.header-studio--banner .header-studio-content {
  margin-left: 2rem;
  padding: 1rem 2rem;
  max-width: none;
  border-left-width: 2px;
}

.header-studio--banner h1 {
  font-family: var(--font-heading) !important;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem) !important;
  font-weight: 500 !important;
  letter-spacing: 0.02em !important;
  text-indent: 0;
  margin-bottom: 0 !important;
  margin-top: 0 !important;
}

.header-studio--banner .header-studio-grid {
  opacity: 0.01;
}

.header-studio--banner .header-studio-bg {
  opacity: 0.10;
}

.header-studio--banner .header-studio-bar {
  width: 3px;
}


/*
  ┌─────────────────────────────────────────────────────────────────────────┐
  │ Header filter system                                                    │
  │                                                                         │
  │ botanical  Line-art engravings on white background. Core effect:        │
  │            invert → dark lines become glowing accent lines; white bg    │
  │            becomes transparent via mix-blend-mode: screen.              │
  │            Requires: dark lines on a white or near-white background.    │
  │                                                                         │
  │ sketch     Like botanical but contrast() pre-boost darkens faint lines  │
  │            before inverting. Use when botanical produces dim lines.     │
  │                                                                         │
  │ woodcut    Historical images with natural color preserved. Slight        │
  │            darken only, no color transformation. Use for color          │
  │            manuscripts, illuminations, woodcuts.                        │
  │                                                                         │
  │ etching    Color photos → high-contrast silhouette + tint. Produces     │
  │            bold shapes, not fine lines. For photos needing line-art     │
  │            look, pre-process and use botanical instead.                 │
  │                                                                         │
  │ photo      Color photos kept photographic — darkened and desaturated    │
  │            slightly. No inversion. Default filter.                      │
  └─────────────────────────────────────────────────────────────────────────┘
*/

/* --- Filter: Botanical (line-art engravings on white background) --- */
.header-studio-bg--botanical {
  filter: invert(1) sepia(0.6) hue-rotate(320deg) saturate(2.5);
  mix-blend-mode: screen;
}

/* --- Filter: Sketch (thin line drawings on white background)
     Like botanical but pre-contrast boost darkens faint lines before inverting.
     Tune: contrast (2–4, higher = thicker lines), brightness at end (1.5–2.5). --- */
.header-studio-bg--sketch {
  filter: grayscale(1) contrast(2.5) invert(1) sepia(0.6) hue-rotate(320deg) saturate(3) brightness(2);
  mix-blend-mode: screen;
}

.header-studio--section .header-studio-bg--sketch {
  opacity: 0.55;
}

.header-studio--banner .header-studio-bg--sketch {
  opacity: 0.35;
}

/* --- Filter: Woodcut (historical images with natural color preserved)
     No color transformation: image shows as-is, slightly darkened for text legibility.
     Tune brightness and opacity to balance image presence vs. text readability. --- */
.header-studio-bg--woodcut {
  filter: saturate(1.05) brightness(0.85);
  mix-blend-mode: normal;
  opacity: 0.75;
}

.header-studio--section .header-studio-bg--woodcut {
  opacity: 0.65;
}

.header-studio--banner .header-studio-bg--woodcut {
  opacity: 0.45;
}

/* --- Filter: Etching (color photos → high-contrast silhouette)
     Pipeline: grayscale → pre-brighten → threshold contrast → post-darken → invert → tint
     contrast(5+) collapses continuous tone to black/white.
     Pre-brightness(1.3) shifts which tones fall above threshold.
     Post-brightness(0.55) controls darkness of the inverted result. --- */
.header-studio-bg--etching {
  filter: grayscale(1) brightness(1.3) contrast(5) brightness(0.55) invert(1) sepia(0.5) hue-rotate(320deg) saturate(3);
  mix-blend-mode: screen;
}

.header-studio--section .header-studio-bg--etching {
  opacity: 0.40;
}

.header-studio--banner .header-studio-bg--etching {
  opacity: 0.25;
}

/* --- Filter: Photo (color photos, photographic aesthetic, default)
     saturate(1.05) gives a slight color lift; brightness(0.85) darkens for text legibility.
     Tune opacity up if image is too faint, down if text becomes hard to read. --- */
.header-studio-bg--photo {
  filter: saturate(1.05) brightness(0.85);
  mix-blend-mode: normal;
  opacity: 0.80;
}

.header-studio--section .header-studio-bg--photo {
  opacity: 0.72;
}

.header-studio--banner .header-studio-bg--photo {
  opacity: 0.50;
}


@media (max-width: 768px) {
  .header-studio-content {
    padding: 2rem 1.5rem;
  }
  .header-studio--section {
    height: 30vh !important;
  }
  .header-studio--section .header-studio-content {
    padding: 1.5rem 1.5rem;
    margin-left: 1rem;
  }
  .header-studio--banner .header-studio-content {
    padding: 0.75rem 1rem;
    margin-left: 1rem;
  }
}