@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Orbitron:wght@400;700;900&display=swap');

:root {
  --bg-deep: #0a0a0f;
  --bg-panel: #0d0d14;
  --bg-input: #111119;
  --border: #1a1a2e;
  --border-glow: #00ff8855;
  --green: #00ff88;
  --green-dim: #00cc6a;
  --green-dark: #003d20;
  --cyan: #00e5ff;
  --red: #ff3355;
  --amber: #ffaa00;
  --text: #c8c8d0;
  --text-dim: #606070;
  --mono: 'Share Tech Mono', monospace;
  --display: 'Orbitron', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 255, 136, 0.015) 2px,
    rgba(0, 255, 136, 0.015) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* CRT vignette */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(0,0,0,0.6) 100%);
  pointer-events: none;
  z-index: 9998;
}

/* Subtle grid background */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,255,136,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,136,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: 0;
}

.container {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 30px 20px 60px;
}

/* ─── Header ─── */
.header {
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.header h1 {
  font-family: var(--display);
  font-size: 2.6rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  color: var(--green);
  text-shadow: 0 0 30px rgba(0,255,136,0.4), 0 0 60px rgba(0,255,136,0.15);
  animation: titlePulse 4s ease-in-out infinite;
}

.header .subtitle {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin-top: 8px;
}

.header .line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  margin-top: 20px;
  opacity: 0.4;
}

@keyframes titlePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.85; }
}

/* ─── Mode Toggle ─── */
.mode-toggle {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-bottom: 32px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.mode-btn {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 10px 28px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.25s;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mode-btn:hover { color: var(--text); }

.mode-btn.active {
  background: var(--green-dark);
  border-color: var(--green);
  color: var(--green);
  text-shadow: 0 0 10px rgba(0,255,136,0.3);
}

/* ─── Panels ─── */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px;
  margin-bottom: 20px;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-dim);
}

.panel-header .dot {
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--green);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ─── Drop Zone ─── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--green);
  background: rgba(0,255,136,0.03);
}

.drop-zone .icon {
  font-size: 2rem;
  margin-bottom: 10px;
  opacity: 0.5;
}

.drop-zone .label {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.drop-zone .label span {
  color: var(--green);
  text-decoration: underline;
  cursor: pointer;
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* Image preview */
.image-preview {
  display: none;
  margin-top: 16px;
  position: relative;
}

.image-preview img {
  max-width: 100%;
  max-height: 300px;
  border: 1px solid var(--border);
  border-radius: 4px;
  display: block;
}

.image-info {
  display: flex;
  gap: 20px;
  margin-top: 10px;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.image-info .tag {
  color: var(--green);
}

/* ─── Inputs ─── */
.field { margin-bottom: 18px; }

.field label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.field textarea,
.field input[type="password"],
.field input[type="text"] {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.25s;
  resize: vertical;
}

.field textarea:focus,
.field input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 1px rgba(0,255,136,0.15);
}

.field textarea { min-height: 100px; }

.char-count {
  text-align: right;
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.char-count .warn { color: var(--amber); }
.char-count .over { color: var(--red); }

/* ─── Action Button ─── */
.action-btn {
  width: 100%;
  padding: 14px;
  font-family: var(--display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  border: 1px solid var(--green);
  background: linear-gradient(180deg, rgba(0,255,136,0.15), rgba(0,255,136,0.05));
  color: var(--green);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.action-btn:hover:not(:disabled) {
  background: linear-gradient(180deg, rgba(0,255,136,0.25), rgba(0,255,136,0.1));
  box-shadow: 0 0 20px rgba(0,255,136,0.15);
  text-shadow: 0 0 10px rgba(0,255,136,0.5);
}

.action-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.action-btn:active:not(:disabled) {
  transform: scale(0.995);
}

/* ─── Output / Result ─── */
.result-area {
  display: none;
  margin-top: 24px;
}

.result-area.visible { display: block; }

.result-image-wrap {
  position: relative;
  display: inline-block;
}

.result-image-wrap img {
  max-width: 100%;
  max-height: 300px;
  border: 1px solid var(--green-dark);
  border-radius: 4px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 10px 20px;
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  background: var(--bg-input);
  border: 1px solid var(--green);
  color: var(--green);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
}

.download-btn:hover {
  background: rgba(0,255,136,0.1);
  box-shadow: 0 0 12px rgba(0,255,136,0.15);
}

/* Decoded message output */
.decoded-msg {
  background: var(--bg-input);
  border: 1px solid var(--green-dark);
  border-radius: 4px;
  padding: 16px;
  color: var(--green);
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 300px;
  overflow-y: auto;
}

/* ─── Status / Log ─── */
.status-bar {
  margin-top: 14px;
  padding: 10px 14px;
  background: var(--bg-input);
  border-left: 3px solid var(--border);
  border-radius: 0 4px 4px 0;
  font-size: 0.72rem;
  color: var(--text-dim);
  display: none;
}

.status-bar.visible { display: block; }
.status-bar.success { border-left-color: var(--green); color: var(--green); }
.status-bar.error { border-left-color: var(--red); color: var(--red); }
.status-bar.working { border-left-color: var(--amber); color: var(--amber); }

/* ─── Capacity Meter ─── */
.capacity-bar {
  display: none;
  margin-bottom: 18px;
}

.capacity-bar.visible { display: block; }

.capacity-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.capacity-track {
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  overflow: hidden;
}

.capacity-fill {
  height: 100%;
  background: var(--green);
  border-radius: 2px;
  transition: width 0.3s, background 0.3s;
  box-shadow: 0 0 6px rgba(0,255,136,0.4);
}

.capacity-fill.warn { background: var(--amber); box-shadow: 0 0 6px rgba(255,170,0,0.4); }
.capacity-fill.over { background: var(--red); box-shadow: 0 0 6px rgba(255,51,85,0.4); }

/* ─── Hidden ─── */
.hidden { display: none !important; }

/* ─── Footer ─── */
.footer {
  text-align: center;
  font-size: 0.6rem;
  color: var(--text-dim);
  margin-top: 40px;
  letter-spacing: 0.1em;
  opacity: 0.5;
}

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .header h1 { font-size: 1.6rem; }
  .container { padding: 20px 14px 40px; }
  .panel { padding: 20px; }
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--green-dark); }

/* Password visibility toggle */
.pass-wrap {
  position: relative;
}

.pass-wrap input {
  padding-right: 44px;
}

.pass-toggle {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 4px;
  transition: color 0.2s;
}

.pass-toggle:hover { color: var(--green); }