/* =========================================================
   IBM Punch Card Decoder — Retro CRT Terminal Theme
   ========================================================= */

:root {
  --bg:          #0a0a0f;
  --bg-card:     #0d0d14;
  --bg-surface:  #12121c;
  --border:      #1a1a2e;
  --border-glow: #00ff8840;
  --text:        #e0e0e0;
  --text-dim:    #606080;
  --green:       #00ff88;
  --green-dim:   #00cc6a;
  --green-glow:  #00ff8830;
  --cyan:        #00e5ff;
  --amber:       #ffb300;
  --red:         #ff3d5a;
  --blue:        #4488ff;
  --punch-hole:  #00ff88;
  --font-mono:   'IBM Plex Mono', 'Courier New', monospace;
  --font-display:'Space Grotesk', 'Helvetica Neue', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- CRT effects ---- */
.scanlines {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.06) 2px,
    rgba(0, 0, 0, 0.06) 4px
  );
}

.vignette {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9998;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(0,0,0,0.5) 100%);
}

/* ---- Container ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ---- Header ---- */
.header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan), var(--green));
  opacity: 0.8;
}

.header-badge {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--bg);
  background: var(--green);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  letter-spacing: 2px;
  text-shadow: 0 0 4px rgba(0,0,0,0.3);
}

.header-text { flex: 1; }

.header h1 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--green);
  text-shadow: 0 0 20px var(--green-glow), 0 0 40px rgba(0,255,136,0.1);
}

.subtitle {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 1px;
  margin-top: 0.25rem;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.led {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green), 0 0 16px var(--green-glow);
  animation: led-pulse 2s ease-in-out infinite;
}

.led.processing {
  background: var(--amber);
  box-shadow: 0 0 8px var(--amber), 0 0 16px rgba(255,179,0,0.3);
  animation: led-pulse 0.5s ease-in-out infinite;
}

.led.active {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan), 0 0 16px rgba(0,229,255,0.3);
}

.led.error {
  background: var(--red);
  box-shadow: 0 0 8px var(--red), 0 0 16px rgba(255,61,90,0.3);
  animation: led-pulse 0.3s ease-in-out infinite;
}

.led-label {
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: var(--text-dim);
}

@keyframes led-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---- Upload Zone ---- */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--bg-card);
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.upload-zone::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, var(--green-glow) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--green);
  box-shadow: 0 0 30px var(--green-glow), inset 0 0 30px var(--green-glow);
}

.upload-zone:hover::after,
.upload-zone.dragover::after {
  opacity: 1;
}

.upload-inner { position: relative; z-index: 1; }

.upload-icon {
  color: var(--green-dim);
  margin-bottom: 1rem;
  filter: drop-shadow(0 0 8px var(--green-glow));
}

.upload-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--green);
  text-shadow: 0 0 10px var(--green-glow);
}

.upload-sub {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

.upload-preview {
  position: relative;
  z-index: 1;
}

.upload-preview img {
  max-width: 100%;
  max-height: 200px;
  border-radius: 4px;
  border: 1px solid var(--border);
  filter: sepia(0.2) contrast(1.1);
}

/* ---- Processing ---- */
.processing {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem;
  color: var(--amber);
  font-size: 0.85rem;
  letter-spacing: 3px;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top-color: var(--amber);
  border-right-color: var(--amber);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Error ---- */
.error-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: rgba(255, 61, 90, 0.1);
  border: 1px solid rgba(255, 61, 90, 0.3);
  border-radius: 6px;
  color: var(--red);
  margin-bottom: 1.5rem;
}

.error-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--red);
  color: var(--bg);
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---- Results ---- */
.results { animation: fade-in 0.5s ease; }

@keyframes fade-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-section {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--cyan);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-icon {
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

/* ---- Decoded text ---- */
.decoded-text-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  position: relative;
  overflow-x: auto;
}

.decoded-text {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--green);
  text-shadow: 0 0 8px var(--green-glow), 0 0 20px rgba(0,255,136,0.15);
  white-space: pre;
  line-height: 1.6;
  min-height: 1.6em;
}

.cursor {
  color: var(--green);
  opacity: 1;
}

.cursor.blink {
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 2px;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  border-color: var(--green);
  color: var(--green);
  box-shadow: 0 0 8px var(--green-glow);
}

.meta-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.meta-tag {
  font-size: 0.65rem;
  letter-spacing: 1px;
  color: var(--text-dim);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
}

/* ---- Punch card grid ---- */
.grid-wrapper {
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.punch-grid {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: max-content;
}

.grid-row {
  display: flex;
  gap: 1px;
  align-items: center;
}

.grid-label {
  width: 28px;
  flex-shrink: 0;
  text-align: right;
  padding-right: 6px;
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.grid-cell {
  width: 10px;
  height: 14px;
  flex-shrink: 0;
  background: var(--bg);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 1px;
  transition: all 0.2s ease;
}

.grid-cell.punched {
  background: var(--punch-hole);
  box-shadow: 0 0 4px var(--green-glow), 0 0 8px rgba(0,255,136,0.15);
  border-color: var(--green-dim);
  animation: hole-pop 0.3s ease both;
}

@keyframes hole-pop {
  0%   { transform: scale(0); opacity: 0; }
  60%  { transform: scale(1.3); }
  100% { transform: scale(1); opacity: 1; }
}

.grid-cell.punched:hover {
  background: #fff;
  box-shadow: 0 0 12px var(--green), 0 0 24px var(--green-glow);
  transform: scale(1.8);
  z-index: 10;
  position: relative;
}

.grid-col-num {
  background: none;
  border: none;
  font-size: 0.5rem;
  color: var(--text-dim);
  text-align: center;
  height: 12px;
  line-height: 12px;
}

.grid-header {
  margin-bottom: 2px;
}

.grid-chars {
  margin-top: 4px;
  border-top: 1px solid var(--border);
  padding-top: 4px;
}

.grid-char-cell {
  background: none;
  border: none;
  font-size: 0.55rem;
  color: var(--text-dim);
  text-align: center;
  height: 14px;
  line-height: 14px;
}

.grid-char-cell.has-char {
  color: var(--cyan);
  font-weight: 600;
  text-shadow: 0 0 4px rgba(0,229,255,0.3);
}

/* ---- Column detail chips ---- */
.column-detail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.col-chip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
  font-size: 0.7rem;
  animation: chip-in 0.3s ease both;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.col-chip:hover {
  border-color: var(--green);
  box-shadow: 0 0 8px var(--green-glow);
}

@keyframes chip-in {
  from { opacity: 0; transform: translateY(6px) scale(0.9); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.col-num {
  color: var(--text-dim);
  font-size: 0.6rem;
  min-width: 1.2em;
  text-align: right;
}

.col-char {
  color: var(--green);
  font-weight: 700;
  font-size: 0.9rem;
  text-shadow: 0 0 6px var(--green-glow);
}

.col-rows {
  color: var(--text-dim);
  font-size: 0.55rem;
  opacity: 0.6;
}

/* ---- Footer ---- */
.footer {
  text-align: center;
  padding: 2rem 0;
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 2px;
}

.footer-credit {
  margin-top: 1.5rem;
}

.footer a {
  color: var(--green);
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.footer a:hover {
  border-bottom-style: solid;
  text-shadow: 0 0 6px var(--green-glow);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .header { flex-direction: column; text-align: center; gap: 1rem; }
  .header h1 { font-size: 1.2rem; }
  .upload-zone { padding: 2rem 1rem; }
  .result-section { padding: 1rem; }
  .grid-cell { width: 6px; height: 8px; }
  .grid-label { width: 20px; font-size: 0.5rem; }
}