/* ── Reset & Variables ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0a0a0f;
  --bg2:       #111118;
  --bg3:       #1a1a24;
  --border:    #2a2a3a;
  --accent:    #00e5a0;
  --accent2:   #0066ff;
  --text:      #e8e8f0;
  --text-muted:#7070a0;
  --danger:    #ff4466;
  --success:   #00e5a0;
  --radius:    12px;
  --mono:      'Space Mono', monospace;
  --sans:      'DM Sans', sans-serif;
  --transition: 200ms ease;
}

html { font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ── Noise texture overlay ─────────────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  position: relative; z-index: 10;
  background: rgba(10,10,15,0.8);
  backdrop-filter: blur(12px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.logo:visited,
.logo:hover,
.logo:active {
  color: inherit;
  text-decoration: none;
}

.logo-icon {
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
}

.logo-text {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;

  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lang-select {
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 0.4rem 0.75rem; font-family: var(--sans); font-size: 0.85rem;
  cursor: pointer; outline: none;
  transition: border-color var(--transition);
}
.lang-select:hover { border-color: var(--accent); }

/* ── Screens ───────────────────────────────────────────────────────────────── */
.screen { display: none; flex: 1; position: relative; z-index: 1; }
.screen.active { display: flex; flex-direction: column; align-items: center; justify-content: center; }

/* ── Home ──────────────────────────────────────────────────────────────────── */
.hero { text-align: center; margin-bottom: 3rem; }

.hero-title {
  font-family: var(--mono);
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: 1.1rem; color: var(--text-muted);
  font-weight: 300; letter-spacing: 0.05em;
  text-transform: uppercase; margin-bottom: 1rem;
}

.p2p-badge {
  display: inline-block;
  background: rgba(0, 229, 160, 0.08);
  border: 1px solid rgba(0, 229, 160, 0.2);
  color: var(--accent);
  font-size: 0.8rem; padding: 0.4rem 1rem;
  border-radius: 100px; letter-spacing: 0.02em;
}

.actions { display: flex; flex-direction: column; align-items: center; gap: 1rem; width: 100%; max-width: 420px; padding: 0 1rem; }

.divider { width: 100%; text-align: center; position: relative; color: var(--text-muted); font-size: 0.8rem; }
.divider::before, .divider::after {
  content: ''; position: absolute; top: 50%; width: 44%;
  height: 1px; background: var(--border);
}
.divider::before { left: 0; }
.divider::after  { right: 0; }

.join-form { display: flex; gap: 0.5rem; width: 100%; }

.input-code {
  flex: 1; background: var(--bg3);
  border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); padding: 0.85rem 1rem;
  font-family: var(--mono); font-size: 1rem; letter-spacing: 0.15em;
  text-transform: uppercase; outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-code:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,229,160,0.12);
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  font-family: var(--sans); font-weight: 600; font-size: 0.95rem;
  padding: 0.85rem 1.5rem; border: none; border-radius: var(--radius);
  cursor: pointer; transition: all var(--transition);
  letter-spacing: 0.01em; white-space: nowrap;
}
.btn-primary {
  background: var(--accent); color: #000;
  box-shadow: 0 0 24px rgba(0,229,160,0.3);
}
.btn-primary:hover { filter: brightness(1.1); box-shadow: 0 0 32px rgba(0,229,160,0.5); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-secondary {
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(1.15); }

.btn.full { width: 100%; }

.btn-icon {
  background: transparent; border: 1px solid var(--border); border-radius: 8px;
  color: var(--text-muted); padding: 0.4rem; cursor: pointer; display: flex;
  align-items: center; justify-content: center;
  transition: all var(--transition);
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }

/* ── Room Layout ───────────────────────────────────────────────────────────── */
#screen-room { justify-content: flex-start; padding: 2rem; }
.room-layout {
  display: grid; grid-template-columns: 300px 1fr;
  gap: 1.5rem; width: 100%; max-width: 900px; margin: 0 auto;
}

.panel {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 16px; padding: 1.5rem;
}

/* ── Info Panel ────────────────────────────────────────────────────────────── */
.room-code-display { margin-bottom: 1.5rem; }
.label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); display: block; margin-bottom: 0.5rem; }

.code-row { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.5rem; }
.mono-code { font-family: var(--mono); font-size: 1.4rem; font-weight: 700; letter-spacing: 0.2em; color: var(--accent); }

.share-hint { font-size: 0.8rem; color: var(--text-muted); line-height: 1.4; }

/* ── Peer Status ───────────────────────────────────────────────────────────── */
.peer-status {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.75rem 1rem; border-radius: 10px;
  background: var(--bg3); border: 1px solid var(--border);
  font-size: 0.9rem; margin-bottom: 1.5rem;
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: var(--text-muted);
}
.peer-status.waiting .status-dot { background: var(--text-muted); animation: pulse 2s infinite; }
.peer-status.connected .status-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.peer-status.disconnected .status-dot { background: var(--danger); }

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

/* ── Stats ─────────────────────────────────────────────────────────────────── */
.transfer-info { display: flex; flex-direction: column; gap: 0.6rem; }
.stat { display: flex; justify-content: space-between; align-items: center; }
.stat-label { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; }
.stat-value { font-family: var(--mono); font-size: 0.85rem; color: var(--text); }

/* ── Drop Zone ─────────────────────────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border); border-radius: 16px;
  padding: 4rem 2rem; text-align: center; cursor: pointer;
  transition: all var(--transition); position: relative;
  background: var(--bg3);
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(0,229,160,0.04);
  box-shadow: inset 0 0 40px rgba(0,229,160,0.05);
}
.drop-icon { font-size: 2.5rem; margin-bottom: 1rem; color: var(--text-muted); }
.drop-text { font-size: 1.1rem; font-weight: 500; margin-bottom: 0.25rem; }
.drop-sub  { font-size: 0.85rem; color: var(--text-muted); }
.file-input-hidden { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

/* Locked state */
.drop-zone.locked { pointer-events: none; opacity: 0.4; }

/* ── Progress ──────────────────────────────────────────────────────────────── */
.progress-area { padding: 2rem; display: flex; flex-direction: column; gap: 1rem; }
.progress-label { display: flex; justify-content: space-between; font-size: 0.9rem; }
.progress-track { height: 6px; background: var(--bg3); border-radius: 100px; overflow: hidden; }
.progress-bar {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  border-radius: 100px;
  transition: width 0.15s linear;
  box-shadow: 0 0 12px rgba(0,229,160,0.5);
}

/* ── Incoming / Done ───────────────────────────────────────────────────────── */
.incoming-area { padding: 2rem; display: flex; flex-direction: column; gap: 1rem; }
.incoming-label { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); }
.incoming-details { display: flex; flex-direction: column; gap: 0.25rem; }
.incoming-size { font-size: 0.85rem; color: var(--text-muted); }
.incoming-actions { display: flex; gap: 0.75rem; }

.done-area { padding: 2rem; display: flex; flex-direction: column; align-items: center; gap: 1rem; text-align: center; }
.done-icon { font-size: 3rem; color: var(--accent); }
.done-text { font-size: 1.2rem; font-weight: 500; }

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

/* ── RTL support ───────────────────────────────────────────────────────────── */
[dir="rtl"] .code-row { flex-direction: row-reverse; }
[dir="rtl"] .stat { flex-direction: row-reverse; }
[dir="rtl"] .progress-bar { background: linear-gradient(270deg, var(--accent2), var(--accent)); }

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .room-layout { grid-template-columns: 1fr; }
  #screen-room { padding: 1rem; }
  .header { padding: 1rem; }
  .hero-title { font-size: 3rem; }
}