2x2 网格，16:9，AI 选取不同的主体：INPUT: $ SUBJECT

2x2 grid, 16:9, AI picks different subjects: INPUT: $ SUBJECT

// ── SEMANTIC INFERENCE ──────────────────────────────────────────
ARCHETYPE     = infer_subject_archetype($ SUBJECT)         // woman, elder, child, craftsman, musician
MOOD          = infer_mood_key($ SUBJECT)                  // serene, defiant, nostalgic, mischievous
ENVIRONMENT   = infer_setting($ SUBJECT)                   // vintage bathroom, garden shed, taxicab, library
ERA           = infer_era_aesthetic($ SUBJECT)             // 1920s, 1970s, contemporary, near-future
STYLING       = infer_wardrobe($ SUBJECT, ERA)             // fabric, cut, silhouette, color
HAIR          = infer_hair_style($ SUBJECT, ERA)
MAKEUP        = infer_makeup_signature($ SUBJECT, ERA)
JEWELRY       = infer_jewelry_set($ SUBJECT, count=2..3)   // nose ring, earring, chain, watch
BODY_ART      = infer_tattoo($ SUBJECT)                    // placement, style, iconography
POSE          = infer_pose($ SUBJECT)                      // profile, three-quarter, back-turned
EXPRESSION    = infer_expression($ SUBJECT)                // eyes closed, half-lidded, direct gaze
PROPS         = infer_counter_props($ SUBJECT, count=4..7) // bottles, towels, tools, books
WALL_ART      = infer_wall_decor($ SUBJECT, count=2..4)    // mirror, icons, prints, calendar
LIGHTING      = infer_light_recipe($ SUBJECT, ERA)         // overhead + window, lamps, neon, candle
COLOR_GRADE   = infer_color_grade($ SUBJECT, ERA)          // teal-warm, sepia, cold-noir, pastel
PALETTE       = infer_palette($ SUBJECT, ERA)

// ── COMPOSITION FIELD ──────────────────────────────────────────
P(x,y) = subject_gravity(ARCHETYPE) + environment_pull(ENVIRONMENT)
F = ∇P                // directional flow: gaze axis, body orientation
Curl = ∇×P            // organic curves: hair, ribbon, fabric folds, smoke
Div  = ∇·F            // density: texture of skin, cloth, wallpaper, clutter

// ── SUBJECT CONSTRUCTION ───────────────────────────────────────
SUBJECT_LAYER = photoreal_human(
  archetype  := ARCHETYPE,
  pose       := POSE,           // e.g., left profile, chin lifted, eyes closed
  expression := EXPRESSION,     // serene confidence, guarded, bemused
  skin       := 'pores visible, natural texture, subtle blush, no plastic smoothing'
)

STYLING_LAYER = {
  hair   := HAIR,               // shape, weight, fall, dampness or shine
  makeup := MAKEUP,             // lips, liner, contour, freckles
  jewelry:= JEWELRY,            // small silver nose ring, dangling gold earring, chain
  garment:= render_fabric(
      type  := STYLING.material,      // satin, linen, silk, wool
      cut   := STYLING.cut,           // cap sleeves, open back, high collar
      color := STYLING.color,         // deep burgundy, ochre, ivory
      detail:= STYLING.detail         // ribbon ties, seams, embroidery
  )
}

BODY_ART_LAYER = {
  placement := BODY_ART.location,    // left arm, shoulder, collarbone
  style     := BODY_ART.style,       // traditional, fine-line, blackwork
  motifs    := BODY_ART.motifs,      // roses, leaves, sparrows, anchors
  rendering := 'saturated ink, subtle sheen from skin oil'
}

// ── ENVIRONMENT ────────────────────────────────────────────────
WALLS = wallpaper_or_paint(
    color   := PALETTE.wall,
    texture := 'hand-applied, subtly uneven, faint scuffs'
)
WALL_DECOR = for each item in WALL_ART:
    render_frame(item.kind, item .art, item.position)
    // gold-frame mirror, icon panel, rosary, cross, sconce
COUNTER = surface_dressing(
    props   := PROPS,               // perfume bottles, tubes, towel, lipstick
    clutter := 'light, arranged, not chaotic — each prop readable'
)

// ── LIGHTING RECIPE ────────────────────────────────────────────
KEY        : warm overhead lamp, diffused, ~2900K, casting soft downward light
FILL       : soft window glow from opposite side, ~5200K daylight diffused
RIM        : faint atmospheric rim from window on hair and shoulder edges
SHADOWS    : soft, present, not crushed
SPECULAR   : subtle on skin, satin highlight on fabric, glass glint on bottles

// ── COLOR GRADE ────────────────────────────────────────────────
Grade   : cool shadows, warm midtones, slightly desaturated reds
Look    : dreamy retro, teal-shifted shadows, filmic rolloff
Palette : wall = pale mint; garment = deep burgundy; skin = warm ivory;
          tattoo = saturated floral; props = amber glass, cream, blush

// ── CAMERA ─────────────────────────────────────────────────────
Lens       : 50mm prime, f/1.8–f/2.0
Distance   : medium-close portrait, upper body in frame
Focus      : tack-sharp on nearest eye / cheekbone / tattoo highlight
Bokeh      : creamy, subtle, golden-amber highlights from props and sconce
Resolution : 8K
Framing    : rule of thirds, subject slightly off-center, gaze space preserved

// ── FINISH ─────────────────────────────────────────────────────
No plastic smoothing, no heavy retouch, no drawn edges.
Skin retains pores, fine hairs, lip texture, subtle creases.
Fabric retains weave, sheen, and weight.
Background props rendered in same photoreal fidelity, softened by DOF.
No text, no watermark, no logos.

Output: one 8K photoreal cinematic portrait, fully inferred from $ SUBJECT.