/* ═══════════════════════════════════════════════════════════════════
   Shards Vault UI — Premium Glassmorphism Design
   Screens: PIN Login → File Drop → Shard Output → Share → View → Reconstruct → Download
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --bg-primary: #060612;
  --bg-secondary: #0a0a1a;
  --bg-card: rgba(16, 16, 40, 0.75);
  --bg-card-hover: rgba(22, 22, 55, 0.85);
  --border: rgba(109, 93, 252, 0.15);
  --border-hover: rgba(109, 93, 252, 0.35);
  --accent: #6d5dfc;
  --accent-light: #8b7fff;
  --accent-glow: rgba(109, 93, 252, 0.25);
  --success: #22c55e;
  --success-glow: rgba(34, 197, 94, 0.2);
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.15);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px var(--accent-glow);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

body {
  background: var(--bg-primary);
  background-image:
    radial-gradient(ellipse at 15% 30%, rgba(109, 93, 252, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 70%, rgba(34, 197, 94, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(147, 51, 234, 0.03) 0%, transparent 60%);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Header ─── */
.vault-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 6, 18, 0.85);
}
.vault-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.vault-brand .icon {
  font-size: 24px;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}
.vault-brand .name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.vault-brand .tag {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 8px;
  background: rgba(109, 93, 252, 0.15);
  color: var(--accent-light);
  border: 1px solid rgba(109, 93, 252, 0.25);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.vault-nav {
  display: flex;
  gap: 6px;
}
.vault-nav-btn {
  background: rgba(15, 15, 40, 0.6);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.vault-nav-btn:hover,
.vault-nav-btn.active {
  background: rgba(109, 93, 252, 0.12);
  border-color: var(--border-hover);
  color: var(--text);
}
.vault-nav-btn.active {
  background: rgba(109, 93, 252, 0.18);
  color: var(--accent-light);
}

/* ─── Main Container ─── */
.vault-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* ─── Screens ─── */
.screen { display: none; }
.screen.active { display: block; animation: screenFadeIn 0.4s ease-out; }

@keyframes screenFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Cards ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.card:hover {
  border-color: var(--border-hover);
}
.card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-subtitle {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: -10px;
  margin-bottom: 16px;
}

/* ─── PIN Login Screen ─── */
.pin-container {
  max-width: 380px;
  margin: 60px auto;
}
.pin-title {
  text-align: center;
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent) 0%, #22c55e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.pin-subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 32px;
}
.pin-input-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 24px;
}
.pin-digit {
  width: 64px;
  height: 72px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 14px;
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  color: var(--text);
  font-family: var(--mono);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-text-security: disc;
}
.pin-digit:focus {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}
.pin-digit.filled {
  border-color: var(--success);
  background: var(--success-glow);
}

.pin-input-name {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 15px;
  color: var(--text);
  font-family: var(--font);
  outline: none;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}
.pin-input-name:focus {
  border-color: var(--accent);
}
.pin-input-name::placeholder { color: var(--text-muted); }

/* ─── Drop Zone ─── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.drop-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(109, 93, 252, 0.05) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
}
.drop-zone:hover::before,
.drop-zone.dragover::before {
  opacity: 1;
}
.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  box-shadow: 0 0 32px var(--accent-glow);
}
.drop-zone .icon-large {
  font-size: 48px;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 12px var(--accent-glow));
}
.drop-zone .label {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 6px;
}
.drop-zone .sublabel {
  font-size: 13px;
  color: var(--text-dim);
}

/* ─── Shard Output ─── */
.shard-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}
.shard-card {
  background: rgba(10, 10, 30, 0.8);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 12px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.shard-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.shard-card .shard-num {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
}
.shard-card .shard-label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.shard-card .shard-hex {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text-muted);
  margin-top: 8px;
  word-break: break-all;
  line-height: 1.4;
  max-height: 48px;
  overflow: hidden;
}
.shard-card .copy-badge {
  position: absolute;
  top: 6px;
  right: 6px;
  font-size: 10px;
  background: var(--accent);
  color: white;
  padding: 2px 6px;
  border-radius: 6px;
  opacity: 0;
  transition: opacity 0.2s;
}
.shard-card:hover .copy-badge { opacity: 1; }

/* ─── Toggle Switch ─── */
.toggle-container {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(10, 10, 30, 0.6);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}
.toggle-label {
  font-size: 14px;
  font-weight: 500;
  flex: 1;
}
.toggle-label.active { color: var(--accent-light); }
.toggle-label.dimmed { color: var(--text-muted); }
.toggle-switch {
  width: 52px;
  height: 28px;
  background: rgba(30, 30, 60, 0.8);
  border-radius: 14px;
  border: 1px solid var(--border);
  cursor: pointer;
  position: relative;
  transition: background 0.3s;
}
.toggle-switch.active {
  background: rgba(109, 93, 252, 0.3);
  border-color: var(--accent);
}
.toggle-switch::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  background: var(--text);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.3s;
}
.toggle-switch.active::after {
  transform: translateX(24px);
  background: var(--accent);
}

/* ─── Buttons ─── */
.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #8b7fff 100%);
  color: white;
  border: none;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.btn-secondary {
  background: rgba(15, 15, 40, 0.6);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover {
  background: rgba(25, 25, 55, 0.8);
  border-color: var(--border-hover);
}
.btn-success {
  background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
  color: white;
  border: none;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: transform 0.15s;
}
.btn-success:hover { transform: translateY(-2px); }
.btn-danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

/* ─── Permission Rows ─── */
.perm-row {
  display: grid;
  grid-template-columns: 1fr 200px 100px;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
}
.perm-row input,
.perm-row select {
  background: rgba(10, 10, 30, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  outline: none;
}
.perm-row input:focus,
.perm-row select:focus {
  border-color: var(--accent);
}
.perm-row select {
  appearance: none;
  cursor: pointer;
}

/* ─── Shard Entry (Reconstruction) ─── */
.shard-entry-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}
.shard-entry-slot {
  background: rgba(10, 10, 30, 0.7);
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 16px 8px;
  text-align: center;
  transition: all 0.3s;
}
.shard-entry-slot.filled {
  border-style: solid;
  border-color: var(--success);
  background: var(--success-glow);
}
.shard-entry-slot .slot-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.shard-entry-slot.filled .slot-num {
  color: var(--success);
}
.shard-entry-slot textarea {
  width: 100%;
  height: 50px;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: var(--mono);
  font-size: 9px;
  resize: none;
  outline: none;
  text-align: center;
}
.shard-count-bar {
  margin-top: 16px;
  text-align: center;
  font-size: 14px;
  color: var(--text-dim);
}
.shard-count-bar .count {
  font-weight: 700;
  font-size: 20px;
}
.shard-count-bar .count.enough { color: var(--success); }
.shard-count-bar .count.not-enough { color: var(--warning); }

/* ─── URL/Hash Display ─── */
.url-display {
  background: rgba(10, 10, 30, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent-light);
  word-break: break-all;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: background 0.2s;
}
.url-display:hover {
  background: rgba(15, 15, 45, 0.9);
}
.url-display .copy-icon {
  flex-shrink: 0;
  font-size: 16px;
}

/* ─── Status Badges ─── */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge-static { background: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-collab { background: rgba(34, 197, 94, 0.15); color: #22c55e; border: 1px solid rgba(34, 197, 94, 0.3); }
.badge-locked { background: rgba(239, 68, 68, 0.15); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-unlocked { background: rgba(34, 197, 94, 0.15); color: #22c55e; border: 1px solid rgba(34, 197, 94, 0.3); }
.badge-sha { background: rgba(147, 51, 234, 0.15); color: #a78bfa; border: 1px solid rgba(147, 51, 234, 0.3); }

/* ─── Animations ─── */
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
  50% { box-shadow: 0 0 40px var(--accent-glow); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes shardReveal {
  from { opacity: 0; transform: scale(0.8) rotateY(20deg); }
  to { opacity: 1; transform: scale(1) rotateY(0); }
}
.animate-slide-up { animation: slideUp 0.4s ease-out forwards; }
.animate-shard { animation: shardReveal 0.5s ease-out forwards; }
.animate-pulse { animation: pulseGlow 2s ease-in-out infinite; }

/* ─── File Info ─── */
.file-info-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}
.file-stat {
  background: rgba(10, 10, 30, 0.6);
  border-radius: var(--radius-sm);
  padding: 12px;
}
.file-stat .stat-label {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.file-stat .stat-value {
  font-size: 16px;
  font-weight: 600;
  margin-top: 4px;
}

/* ─── Progress Bar ─── */
.progress-track {
  width: 100%;
  height: 6px;
  background: rgba(15, 15, 40, 0.8);
  border-radius: 3px;
  overflow: hidden;
  margin: 16px 0;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 3px;
  transition: width 0.5s ease;
  width: 0%;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .shard-grid { grid-template-columns: repeat(3, 1fr); }
  .shard-entry-grid { grid-template-columns: repeat(3, 1fr); }
  .perm-row { grid-template-columns: 1fr; }
  .vault-nav { display: none; }
  .file-info-display { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .shard-grid { grid-template-columns: repeat(2, 1fr); }
  .shard-entry-grid { grid-template-columns: repeat(2, 1fr); }
  .pin-input-row { gap: 8px; }
  .pin-digit { width: 52px; height: 60px; font-size: 24px; }
}