coverizejs/coverize.css

Intelligent book cover typesetting for visually balanced, multi-line titles and authors.

/*╭────────────────────────────────────────────────╮ 
  │ COVERIZE.CSS - Book Cover Generation Library   │
  │ Version: 1.0.0                                 │
  │ License: GPL-3.0                               │
  ╰────────────────────────────────────────────────╯*/

/* =================================================================
   CSS CUSTOM PROPERTIES
   ================================================================= */

:root {
  /* Layout & Dimensions */
  --coverize-default-ratio: 0.67;
  --coverize-default-width: 200px;
  --coverize-border-radius: 0.8em;
  --coverize-border-radius-realism: 0.4em 0.52em 0.52em 0.4em;
  --coverize-shadow: 0 10px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  
  /* Typography */
  --coverize-font-sans: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --coverize-font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --coverize-text-primary: #f9f9f9;
  --coverize-text-shadow-dark: rgba(30,30,30,0.38);
  --coverize-text-shadow-light: rgba(255,255,255,0.22);
  --coverize-line-height: 1.1;
  
  /* Size System */
  --coverize-title-size: 2em;
  --coverize-author-size: 1.15em;
  --coverize-secondary-size: 1.2em;
  
  /* Effect Opacities */
  --coverize-texture-opacity: 0.5;
  --coverize-sheen-opacity: 0.8;
  --coverize-typeset-opacity: 0.95;
  
  /* Color Palette - Light Tones */
  --coverize-white-18: rgba(255,255,255,0.18);
  --coverize-white-10: rgba(255,255,255,0.10);
  
  /* Color Palette - Dark Tones */
  --coverize-black-18: rgba(0,0,0,0.18);
  --coverize-black-10: rgba(0,0,0,0.10);
  --coverize-black-08: rgba(0,0,0,0.08);
  --coverize-black-04: rgba(0,0,0,0.04);
  
  /* Texture Colors */
  --coverize-linen-light: rgba(210,180,140,0.22);
  --coverize-linen-medium: rgba(180,140,100,0.18);
  --coverize-linen-warm: rgba(220,180,120,0.18);
  --coverize-linen-dark: rgba(180,120,60,0.11);
}

/* =================================================================
   CORE LAYOUT & STRUCTURE
   ================================================================= */

.coverize {
  /* Core Positioning */
  position: relative;
  width: var(--coverize-default-width);
  aspect-ratio: var(--coverize-default-ratio);
  
  /* Visual Properties */
  border-radius: var(--coverize-border-radius);
  box-shadow: var(--coverize-shadow);
  
  /* Layout Properties */
  overflow: visible;
  isolation: isolate;
  box-sizing: border-box;
  font-size: 1rem;
  
  /* Size System Variables */
  --coverize-title-size: 2em;
  --coverize-author-size: 1.15em;
  --coverize-secondary-size: 1.2em;
}

/* Layer System */
.coverize-background,
.coverize-effects,
.coverize-typeset {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
}

.coverize-background,
.coverize-effects {
  overflow: hidden; /* Clipping container */
}

/* Z-Index Layering */
.coverize-background { z-index: 1; }
.coverize-image { z-index: 2; }
.coverize-effects { z-index: 20; }
.coverize-typeset { 
  z-index: 300;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  opacity: var(--coverize-typeset-opacity);
  padding: 0;
  box-sizing: border-box;
  overflow: visible;
}

.coverize-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}

/* =================================================================
   TYPOGRAPHY SYSTEM
   ================================================================= */

.coverize-typeset-line {
  font-family: var(--coverize-font-sans);
  text-align: center;
  line-height: var(--coverize-line-height);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* Font Variants */
.coverize-title-serif,
.coverize-author-serif { 
  font-family: var(--coverize-font-serif);
}

/* Text Block Layout */
.coverize-title-block,
.coverize-author-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.coverize-title-block { 
  justify-content: flex-start;
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: visible;
  padding: 10% 10% 0 10%;
}

.coverize-title-block.has-author {
  -webkit-mask: linear-gradient(to bottom, black 0%, black 82%, transparent 100%);
  mask: linear-gradient(to bottom, black 0%, black 82%, transparent 100%);
}

.coverize-author-block { 
  justify-content: flex-end;
  flex-shrink: 0;
  margin-top: auto;
  padding: 0 10% 10% 10%;
}

/* Typography Elements */
.coverize-typeset-line.coverize-title {
  margin: 0 0 0.1em;
  font-size: var(--coverize-title-size);
  max-width: none;
  overflow: visible;
}

.coverize-typeset-line.coverize-author {
  margin: 0.5rem 0.8rem 0;
  font-size: var(--coverize-author-size);
  text-transform: uppercase;
}

/* Text Styling Modifiers */
.coverize-line--uppercase { text-transform: uppercase; }
.coverize-line--bold { font-weight: 600 !important; }
.coverize-line--secondary { font-weight: 300 !important; }

.coverize-typeset-line.coverize-title + .coverize-line--secondary {
  margin-top: -0.1em;
}

/* =================================================================
   SIZE SYSTEM
   ================================================================= */

.coverize-size-small {
  --coverize-title-size: 1.4em;
  --coverize-author-size: 0.8em;
  --coverize-secondary-size: 0.9em;
}

.coverize-size-regular {
  --coverize-title-size: 2em;
  --coverize-author-size: 1.15em;
  --coverize-secondary-size: 1.2em;
}

.coverize-size-large {
  --coverize-title-size: 2.8em;
  --coverize-author-size: 1.6em;
  --coverize-secondary-size: 1.5em;
}

.coverize-line--uppercase { text-transform: uppercase; }
.coverize-line--bold { font-weight: 600 !important; }
.coverize-line--secondary { font-weight: 300 !important; }

.coverize-typeset-line.coverize-title + .coverize-line--secondary {
  margin-top: -0.1em;
}

.coverize-text-debossed {
  color: var(--coverize-text-primary);
  text-shadow: 
    0 -2px 3px var(--coverize-text-shadow-dark),
    0 1px 0.5px var(--coverize-text-shadow-light);
  filter: brightness(1.13) saturate(1.01);
  mix-blend-mode: lighten;
}

/* =================================================================
   REALISM EFFECTS
   ================================================================= */

.coverize[data-realism="true"] .coverize-title-block {
  padding: 10% 10% 0 12%;
}

.coverize[data-realism="true"] .coverize-author-block {
  padding: 0 10% 10% 12%;
}

.coverize[data-realism="true"] {
  border-radius: var(--coverize-border-radius-realism);
}

/* =================================================================
   TEXT EFFECTS
   ================================================================= */

/* VISUAL EFFECTS */
.coverize-texture,
.coverize-sheen,
.coverize-realism,
.coverize-spine,
.coverize-depth {
  position: absolute;
  pointer-events: none;
  border-radius: inherit;
  contain: layout style paint;
}

.coverize-texture,
.coverize-sheen,
.coverize-realism,
.coverize-spine { inset: 0; }

.coverize-effects { filter: blur(0); }
.coverize-texture,
.coverize-sheen {
  will-change: transform, opacity;
  transform: translate3d(0,0,0);
}

/* Texture */
.coverize-texture {
  z-index: 10;
  mix-blend-mode: multiply;
  opacity: var(--coverize-texture-opacity);
}

.coverize-texture::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, var(--coverize-linen-light), var(--coverize-linen-medium));
  filter: blur(6px) saturate(0.7);
  mix-blend-mode: multiply;
  opacity: 0.45;
}

.coverize-texture::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, var(--coverize-linen-warm), var(--coverize-linen-dark));
  mix-blend-mode: multiply;
  opacity: 0.18;
}

/* Realism */
.coverize-realism {
  z-index: 3;
  box-shadow: 
    inset 0 2px 4px rgba(255,255,255,0.45),
    inset -2px 0 4px rgba(255,255,255,0.32),
    inset 0 -3px 4px var(--coverize-black-18);
}

.coverize-spine {
  width: 7%;
  z-index: 3;
  background: linear-gradient(to right,
    var(--coverize-black-08) 0%,
    var(--coverize-black-04) 15%,
    var(--coverize-white-18) 35%,
    var(--coverize-white-10) 50%,
    var(--coverize-black-10) 65%,
    var(--coverize-black-04) 75%,
    transparent 100%
  );
}

/* Sheen */
.coverize-sheen {
  z-index: 201;
  mix-blend-mode: screen;
  background: 
    radial-gradient(ellipse 80% 40% at 60% 20%, 
      var(--coverize-white-18) 0%, 
      rgba(255,255,255,0.06) 60%, 
      transparent 100%
    );
  filter: blur(2px);
  opacity: var(--coverize-sheen-opacity);
}

.coverize-sheen::before {
  content: '';
  position: absolute;
  top: -7%;
  left: 50%;
  width: 68%;
  height: 22%;
  transform: translateX(-50%);
  background: radial-gradient(ellipse 60% 100% at 50% 0%, 
    rgba(255,255,255,0.85) 0%, 
    var(--coverize-white-18) 60%, 
    transparent 100%
  );
  filter: blur(3px);
  mix-blend-mode: screen;
  opacity: 0.32;
}

.coverize-sheen::after {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(to right,
      transparent 0%,
      transparent 98.5%,
      rgba(255,255,255,0.17) 98.5%,
      rgba(255,255,255,0.11) 99%,
      rgba(0,0,0,0.13) 99.2%,
      rgba(0,0,0,0.26) 99.4%,
      rgba(0,0,0,0.48) 100%
    ),
    linear-gradient(to top,
      var(--coverize-black-18) 0%,
      var(--coverize-black-10) 1%,
      transparent 1%
    );
  filter: blur(0.5px);
  mix-blend-mode: screen;
  opacity: 0.6;
}

/* Depth */
.coverize-depth {
  left: 3%;
  bottom: 0.6%;
  width: calc(100% - 2.5%);
  height: 1.7%;
  background: repeating-linear-gradient(to top, #fefefe 0px, #fefefe 1px, #e5e5e5 1px, #e5e5e5 2px);
  border-radius: 0.4em;
  box-shadow: 0 0.1em 0.4em rgba(60,40,10,0.18), inset 0 0.1em 0.15em rgba(0,0,0,0.55);
  z-index: 3;
}

.coverize[data-realism="true"] .coverize-depth {
  border-radius: 0.05em 0 0.2em 0.1em;
}

/* ACCESSIBILITY & BROWSER SUPPORT */
@media (prefers-reduced-motion: reduce) {
  .coverize-sheen,
  .coverize-texture {
    filter: none;
    animation: none;
    will-change: auto;
  }
}

@media (prefers-contrast: high) {
  .coverize-text-debossed {
    text-shadow: none;
    color: #000;
    background: rgba(255,255,255,0.9);
    padding: 0.2em 0.4em;
    border-radius: 0.2em;
  }
}

@supports not (aspect-ratio: 0.67) {
  .coverize { height: 150px; }
}

.coverize[data-realism="true"] {
  border-radius: var(--coverize-border-radius-realism);
}