:root {
  --bg:        #0f172a;
  --surface:   #1e293b;
  --surface2:  #273548;
  --border:    #334155;
  --accent:    #3b82f6;
  --accent-h:  #2563eb;
  --success:   #22c55e;
  --danger:    #ef4444;
  --text:      #f1f5f9;
  --muted:     #94a3b8;
  --radius:    12px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ──────────────────────────────────────────────────────────────── */

header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
}

.header-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: .75rem;
}

.logo {
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo svg { width: 1.25rem; height: 1.25rem; color: #fff; }

header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -.02em;
}

header .tagline {
  font-size: .8rem;
  color: var(--muted);
  margin-left: auto;
}

/* ── Main ────────────────────────────────────────────────────────────────── */

main {
  flex: 1;
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* ── Cards ───────────────────────────────────────────────────────────────── */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card-title {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

/* ── Drop zone ───────────────────────────────────────────────────────────── */

#drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  position: relative;
}

#drop-zone:hover,
#drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(59,130,246,.05);
}

.drop-icon { font-size: 2.5rem; margin-bottom: .5rem; }
.drop-prompt p { color: var(--muted); font-size: .9rem; }
.drop-prompt strong { color: var(--text); }

/* File info (shown when file selected) */
#file-info {
  display: flex;
  align-items: center;
  gap: .75rem;
}
#file-info .fi-icon { font-size: 1.75rem; }
#file-info .fi-meta { flex: 1; text-align: left; }
#file-info .fi-meta .fi-name { font-weight: 600; word-break: break-all; }
#file-info .fi-meta .fi-size { font-size: .8rem; color: var(--muted); margin-top: .15rem; }

/* ── Settings ─────────────────────────────────────────────────────────────── */

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 480px) {
  .settings-grid { grid-template-columns: 1fr; }
}

label {
  display: block;
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: .4rem;
}

input[type="text"],
input[type="password"],
input[type="number"],
select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: .9rem;
  padding: .55rem .75rem;
  outline: none;
  transition: border-color .15s;
}
input:focus, select:focus { border-color: var(--accent); }

.pass-wrap {
  position: relative;
}
.pass-wrap input { padding-right: 2.5rem; font-family: monospace; letter-spacing: .04em; }
.pass-actions {
  position: absolute;
  right: .5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: .25rem;
}
.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: .15rem;
  line-height: 1;
  opacity: .7;
  transition: opacity .15s;
}
.icon-btn:hover { opacity: 1; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .65rem 1.25rem;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background .15s, opacity .15s;
}
.btn:disabled { opacity: .4; cursor: not-allowed; }

.btn-primary   { background: var(--accent);  color: #fff; width: 100%; margin-top: .75rem; padding: .8rem; }
.btn-primary:hover:not(:disabled) { background: var(--accent-h); }

.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); }

.btn-success   { background: var(--success); color: #fff; }
.btn-danger    { background: var(--danger);  color: #fff; }

/* ── Progress ─────────────────────────────────────────────────────────────── */

.progress-wrap {
  background: var(--surface2);
  border-radius: 999px;
  height: .5rem;
  overflow: hidden;
  margin: 1rem 0 .5rem;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #7c3aed);
  border-radius: 999px;
  transition: width .3s ease;
  width: 0%;
}
.progress-label {
  font-size: .8rem;
  color: var(--muted);
  text-align: center;
}

/* ── Share section ────────────────────────────────────────────────────────── */

.share-row {
  display: flex;
  gap: .5rem;
  align-items: center;
  margin-bottom: .75rem;
}
.share-row input { flex: 1; font-size: .85rem; }
.share-row .btn  { flex-shrink: 0; padding: .55rem .9rem; font-size: .8rem; }

.success-icon { font-size: 3rem; margin-bottom: .5rem; text-align: center; }

/* ── File meta (download page) ────────────────────────────────────────────── */

.meta-grid {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-bottom: 1rem;
}
.meta-row {
  display: flex;
  justify-content: space-between;
  font-size: .9rem;
}
.meta-row .meta-key   { color: var(--muted); }
.meta-row .meta-val   { font-weight: 500; }

/* ── Utilities ────────────────────────────────────────────────────────────── */

.hidden { display: none !important; }

.text-center { text-align: center; }
.text-muted  { color: var(--muted); font-size: .85rem; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: .5rem; }

.badge {
  display: inline-block;
  padding: .2rem .5rem;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.badge-blue { background: rgba(59,130,246,.2); color: #93c5fd; }

/* Shake animation for wrong password */
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%,60%  { transform: translateX(-6px); }
  40%,80%  { transform: translateX(6px); }
}
.shake { animation: shake .4s ease; }

/* ── Footer ──────────────────────────────────────────────────────────────── */

footer {
  text-align: center;
  padding: 1.5rem;
  font-size: .78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}