/* Blake-Inspired Poetry Site - Decorative Border System
   Ornate frames inspired by Blake's illuminated manuscript borders
*/

/* === ILLUMINATED FRAME CONTAINER ===
   The main frame wrapper for poem pages
*/
.illuminated-frame {
  position: relative;
  padding: clamp(2rem, 5vw, 4rem);

  /* Frame positioning reference */
  --frame-inset: clamp(1.5rem, 4vw, 3rem);
  --corner-size: clamp(60px, 10vw, 100px);
  --edge-thickness: clamp(20px, 3vw, 35px);
}

/* === SVG COLOR FILTER ===
   Converts black SVGs to gold/cream tones
*/
.border-element {
  /* Gold tint filter for SVG elements */
  filter:
    brightness(0)
    saturate(100%)
    invert(75%)
    sepia(30%)
    saturate(500%)
    hue-rotate(5deg)
    brightness(95%);
}

.border-element--cream {
  filter:
    brightness(0)
    saturate(100%)
    invert(95%)
    sepia(10%)
    saturate(200%)
    hue-rotate(10deg);
}

.border-element--copper {
  filter:
    brightness(0)
    saturate(100%)
    invert(55%)
    sepia(50%)
    saturate(600%)
    hue-rotate(350deg)
    brightness(90%);
}

/* === CORNER ORNAMENTS ===
   Positioned at the four corners of the frame
*/
.corner {
  position: absolute;
  width: var(--corner-size);
  height: var(--corner-size);
  background-image: var(--border-corner, url('../assets/borders/corner-ornament.svg'));
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.9;
  pointer-events: none;
}

.corner--tl {
  top: var(--frame-inset);
  left: var(--frame-inset);
}

.corner--tr {
  top: var(--frame-inset);
  right: var(--frame-inset);
  transform: scaleX(-1);
}

.corner--bl {
  bottom: var(--frame-inset);
  left: var(--frame-inset);
  transform: scaleY(-1);
}

.corner--br {
  bottom: var(--frame-inset);
  right: var(--frame-inset);
  transform: scale(-1);
}

/* === EDGE DECORATIONS ===
   Repeating patterns along frame edges
*/
.edge {
  position: absolute;
  background-image: var(--border-edge, url('../assets/borders/edge-pattern.svg'));
  background-size: auto 100%;
  background-repeat: repeat-x;
  opacity: 0.85;
  pointer-events: none;
}

.edge--top,
.edge--bottom {
  left: calc(var(--frame-inset) + var(--corner-size));
  right: calc(var(--frame-inset) + var(--corner-size));
  height: var(--edge-thickness);
}

.edge--top {
  top: var(--frame-inset);
}

.edge--bottom {
  bottom: var(--frame-inset);
  transform: scaleY(-1);
}

.edge--left,
.edge--right {
  top: calc(var(--frame-inset) + var(--corner-size));
  bottom: calc(var(--frame-inset) + var(--corner-size));
  width: var(--edge-thickness);
  background-repeat: repeat-y;
  background-size: 100% auto;
}

.edge--left {
  left: var(--frame-inset);
}

.edge--right {
  right: var(--frame-inset);
  transform: scaleX(-1);
}

/* === BORDER THEMES ===
   Per-poem border variations via custom properties
*/

/* Vine/Nature theme - organic, twisting */
.border-theme-vine {
  --border-corner: url('../assets/borders/vine-corner.svg');
  --border-edge: url('../assets/borders/vine-edge.svg');
  --border-color: var(--light-cream);
}

/* Flame/Passion theme - dynamic, energetic */
.border-theme-flame {
  --border-corner: url('../assets/borders/flame-corner.svg');
  --border-edge: url('../assets/borders/flame-edge.svg');
  --border-color: var(--light-copper);
}

/* Minimal theme - simple geometric (corners only, no edge pattern) */
.border-theme-minimal {
  --border-corner: url('../assets/borders/minimal-corner.svg');
  --border-edge: none;
}

/* Hand-drawn/Sketched theme - organic, human imperfections */
.border-theme-sketched {
  --border-corner: url('../assets/borders/hand-drawn-corner.svg');
  --border-edge: url('../assets/borders/hand-drawn-edge.svg');
  --border-color: var(--accent-copper);
}

/* Full sketched frame - larger decorative corners */
.border-theme-sketched-full {
  --border-corner: url('../assets/borders/sketched-frame-corner.svg');
  --border-edge: url('../assets/borders/hand-drawn-edge.svg');
  --border-color: var(--accent-gold);
}

/* === BREATHING ANIMATIONS FOR BORDERS === */
.illuminated-frame .corner {
  animation: breathe var(--breathe-duration, 4s) ease-in-out infinite;
}

.illuminated-frame .edge {
  animation: flicker var(--flicker-duration, 3s) ease-in-out infinite;
}

/* === CSS-ONLY SIMPLE BORDER ===
   Fallback when SVGs aren't available
*/
.border-etched {
  position: relative;
  border: 2px solid var(--light-gold);
  box-shadow:
    0 0 0 1px var(--ground-warm-black),
    0 0 0 3px var(--light-copper),
    0 0 0 4px var(--ground-warm-black),
    inset 0 0 30px var(--shadow-soft);
}

/* Double-line classical border */
.border-classical {
  border: 1px solid var(--light-cream);
  outline: 1px solid var(--light-cream);
  outline-offset: 6px;
}

/* Inner shadow to create depth */
.border-classical::before {
  content: '';
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(245, 240, 230, 0.3);
  pointer-events: none;
}

/* === BLANK ILLUMINATION FRAME ===
   Ornate frame for empty state - the frame IS the content
*/
.blank-illumination {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.blank-frame {
  width: min(90vw, 600px);
  aspect-ratio: 3 / 4;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Central emptiness with subtle presence */
.blank-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 2px;
  background: var(--light-gold);
  border-radius: 50%;
  opacity: 0.3;
  animation: breathe 4s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% {
    opacity: 0.2;
    box-shadow: 0 0 10px rgba(201, 169, 98, 0.1);
  }
  50% {
    opacity: 0.5;
    box-shadow: 0 0 30px rgba(201, 169, 98, 0.2);
  }
}

/* Inner boundary hint */
.blank-frame::before {
  content: '';
  position: absolute;
  inset: 15%;
  border: 1px solid rgba(245, 240, 230, 0.05);
  pointer-events: none;
}