/* ─────────────────────────────────────────────── */
/*  P2PFT — Global Design System                   */
/* ─────────────────────────────────────────────── */

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

:root {
  --bg-deep:      #05040f;
  --bg-surface:   #0d0c1d;
  --bg-card:      rgba(255,255,255,0.04);
  --bg-card-hover:rgba(255,255,255,0.075);
  --border:       rgba(255,255,255,0.08);
  --border-glow:  rgba(99,102,241,0.45);

  --primary:      #6366f1;
  --primary-lt:   #818cf8;
  --secondary:    #8b5cf6;
  --accent:       #06b6d4;
  --success:      #10b981;
  --danger:       #ef4444;
  --warn:         #f59e0b;

  --text-1:   #f0f0ff;
  --text-2:   #a5a3c8;
  --text-3:   #6b6994;

  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 8px 32px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.18);

  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-deep);
  color: var(--text-1);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ─── Animated Background Blobs ─── */
.bg-blobs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: float-blob 18s ease-in-out infinite;
}
.blob-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #6366f1, transparent 70%);
  top: -200px; left: -200px;
  animation-delay: 0s;
}
.blob-2 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, #8b5cf6, transparent 70%);
  bottom: -150px; right: -150px;
  animation-delay: -6s;
}
.blob-3 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #06b6d4, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -12s;
}
@keyframes float-blob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(30px, -40px) scale(1.05); }
  66%       { transform: translate(-20px, 30px) scale(0.95); }
}

/* ─── Screens ─── */
#app { position: relative; z-index: 1; }

.screen { display: none; }
.screen.active { display: block; }

/* ───────────────────────────────────── */
/*  HOME SCREEN                         */
/* ───────────────────────────────────── */

#screen-home {
  min-height: 100vh;
}
#screen-home.active {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 20px 60px;
}

/* Hero */
.hero { text-align: center; max-width: 680px; margin-bottom: 52px; }

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 36px;
}
.logo.small { gap: 8px; }
.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #a5b4fc, #c4b5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.04em;
  margin-bottom: 18px;
  color: var(--text-1);
}

.gradient-text {
  background: linear-gradient(135deg, #818cf8 0%, #c084fc 50%, #22d3ee 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-2);
  max-width: 460px;
  margin: 0 auto 28px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.badge {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text-2);
  letter-spacing: 0.01em;
}

/* Action cards layout */
.action-cards {
  display: flex;
  align-items: stretch;
  gap: 0;
  max-width: 780px;
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  overflow: hidden;
}

.card {
  flex: 1;
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
}
.card p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.5;
}

.card-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 6px;
}
.send-icon {
  background: linear-gradient(135deg, rgba(99,102,241,0.25), rgba(139,92,246,0.25));
  color: #818cf8;
  border: 1px solid rgba(99,102,241,0.35);
}
.receive-icon {
  background: linear-gradient(135deg, rgba(6,182,212,0.2), rgba(16,185,129,0.2));
  color: #2dd4bf;
  border: 1px solid rgba(6,182,212,0.3);
}

/* OR Divider */
.or-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 0;
  gap: 10px;
  color: var(--text-3);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}
.or-line {
  width: 1px;
  flex: 1;
  background: var(--border);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.btn-primary {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(99,102,241,0.55);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--text-1);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--border-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-2);
  transition: var(--transition);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text-1);
  border-color: rgba(255,255,255,0.15);
}

.btn-large { padding: 15px 32px; font-size: 1rem; width: 100%; border-radius: var(--radius); }

/* Join group */
.join-group {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.code-input {
  flex: 1;
  padding: 12px 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-1);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  transition: var(--transition);
  outline: none;
}
.code-input::placeholder { color: var(--text-3); }
.code-input:focus {
  border-color: var(--border-glow);
  background: rgba(99,102,241,0.06);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.error-msg {
  color: var(--danger);
  font-size: 0.83rem;
  margin-top: 4px;
}

/* Footer */
.home-footer {
  margin-top: 40px;
  font-size: 0.82rem;
  color: var(--text-3);
  text-align: center;
  max-width: 500px;
}
.home-footer strong { color: var(--text-2); }

/* ───────────────────────────────────── */
/*  TRANSFER SCREEN                     */
/* ───────────────────────────────────── */

#screen-transfer {
  min-height: 100vh;
}
#screen-transfer.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
}

.transfer-container {
  width: 100%;
  max-width: 560px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(24px);
  padding: 32px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.transfer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Status */
.status-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.room-code-display {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.25);
  border-radius: var(--radius);
  padding: 14px 18px;
}
.room-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.room-code-value {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: #a5b4fc;
  flex: 1;
}
.font-mono { font-family: 'JetBrains Mono', monospace; }

.copy-btn {
  padding: 7px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  color: var(--text-2);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
}
.copy-btn:hover { background: rgba(255,255,255,0.13); color: var(--text-1); }
.copy-btn.copied { color: var(--success); border-color: var(--success); }

.peer-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-2);
}
.status-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text-3);
  transition: background 0.4s;
  flex-shrink: 0;
}
.status-dot.connecting { background: var(--warn); animation: pulse-dot 1.2s infinite; }
.status-dot.connected  { background: var(--success); }
.status-dot.error      { background: var(--danger); }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 44px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: rgba(255,255,255,0.02);
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--border-glow);
  background: rgba(99,102,241,0.06);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}
.drop-icon { color: var(--text-3); margin-bottom: 14px; transition: var(--transition); }
.drop-zone:hover .drop-icon { color: var(--primary-lt); transform: translateY(-3px); }
.drop-title { font-size: 1rem; font-weight: 600; color: var(--text-2); margin-bottom: 6px; }
.drop-sub   { font-size: 0.82rem; color: var(--text-3); }

/* File queue */
.file-queue {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}
.file-item-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-1); }
.file-item-size { color: var(--text-3); font-size: 0.78rem; white-space: nowrap; }
.file-item-remove {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(239,68,68,0.15);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: var(--transition);
}
.file-item-remove:hover { background: rgba(239,68,68,0.3); }

/* Receiver waiting */
.waiting-receiver {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 36px 0;
  color: var(--text-3);
  position: relative;
}
.waiting-receiver svg { position: relative; z-index: 1; }
.waiting-receiver p { font-size: 0.9rem; }
.pulse-ring {
  position: absolute;
  top: 24px; left: 50%;
  transform: translateX(-50%);
  width: 80px; height: 80px;
  border-radius: 50%;
  background: rgba(99,102,241,0.1);
  animation: pulse-ring 2s ease-in-out infinite;
}
@keyframes pulse-ring {
  0% { transform: translateX(-50%) scale(0.8); opacity: 0.8; }
  100% { transform: translateX(-50%) scale(2); opacity: 0; }
}

/* Progress panel */
.progress-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 24px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  animation: fade-in 0.3s ease;
}
@keyframes fade-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.progress-file-info {
  display: flex;
  align-items: center;
  gap: 14px;
}
.progress-file-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.25);
  display: flex; align-items: center; justify-content: center;
  color: #818cf8;
  flex-shrink: 0;
}
.progress-filename { font-size: 0.92rem; font-weight: 600; color: var(--text-1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 340px; }
.progress-filesize { font-size: 0.8rem; color: var(--text-3); margin-top: 2px; }

.progress-bar-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}
.progress-bar-track {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.07);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6, #22d3ee);
  background-size: 200% 100%;
  transition: width 0.25s ease;
  animation: shimmer 2s linear infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.progress-pct {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary-lt);
  font-family: 'JetBrains Mono', monospace;
  min-width: 38px;
  text-align: right;
}

.progress-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
}
.stat-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-3); }
.stat-value { font-size: 0.92rem; font-weight: 600; color: var(--text-1); font-family: 'JetBrains Mono', monospace; }

/* Done panel */
.done-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 32px 24px;
  text-align: center;
  animation: fade-in 0.4s ease;
}
.done-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(16,185,129,0.25), rgba(6,182,212,0.25));
  border: 2px solid rgba(16,185,129,0.45);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
  color: var(--success);
  box-shadow: 0 0 24px rgba(16,185,129,0.25);
}
.done-panel h3 { font-size: 1.2rem; font-weight: 700; color: var(--text-1); }
.done-panel p  { font-size: 0.88rem; color: var(--text-2); }

.download-links { display: flex; flex-direction: column; gap: 8px; width: 100%; }
.download-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  background: rgba(16,185,129,0.08);
  border: 1px solid rgba(16,185,129,0.25);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--success);
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
}
.download-link:hover { background: rgba(16,185,129,0.16); }
.download-link-name { flex: 1; text-align: left; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-1); }

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .action-cards {
    flex-direction: column;
  }
  .or-divider {
    flex-direction: row;
    padding: 24px 0;
  }
  .or-line { width: auto; height: 1px; flex: 1; }
  .card { padding: 28px 24px; }
  .hero-title { font-size: 2.2rem; }
  .transfer-container { padding: 24px 18px; }
  
  .progress-stats { 
    grid-template-columns: 1fr; 
    gap: 16px; 
  }
  .stat { padding: 8px; }
  .room-code-display { flex-direction: column; gap: 8px; align-items: center; }
  .progress-file-info { flex-direction: column; text-align: center; }
  
  #screen-home.active { padding: 24px 16px 40px; }
}