/* ── Theme tokens ──────────────────────────────────────────────────────────── */

:root {
  --color-bg:           #0B1F3A;
  --color-surface:      #0e2546;
  --color-surface-2:    #112d52;
  --color-border:       #1c3a5e;
  --color-accent:       #C8D0DC;
  --color-accent-dim:   rgba(200,208,220,0.18);
  --color-accent-glow:  rgba(200,208,220,0.07);
  --color-text:         #dde5f0;
  --color-muted:        #565b61;
  --color-green:        #4ade80;
  --color-red:          #f87171;
  --color-yellow:       #fbbf24;
  --color-code-bg:      #060f1e;
  --color-code-text:    #a8c4e8;
  --color-code-bright:  #dde5f0;
}

[data-theme="light"] {
  --color-bg:           #F2F4F7;
  --color-surface:      #ffffff;
  --color-surface-2:    #e6eaf0;
  --color-border:       #c4cdd8;
  --color-accent:       #0B1F3A;
  --color-accent-dim:   rgba(11,31,58,0.15);
  --color-accent-glow:  rgba(11,31,58,0.06);
  --color-text:         #0B1F3A;
  --color-muted:        #4a6282;
  --color-green:        #16a34a;
  --color-red:          #dc2626;
  --color-yellow:       #92400e;
  --color-code-bg:      #e0e5ee;
  --color-code-text:    #234060;
  --color-code-bright:  #0B1F3A;
}

/* ── Logo switching ────────────────────────────────────────────────────────── */

.logo-light { display: block; }
.logo-dark  { display: none;  }

[data-theme="light"] .logo-light { display: block; }
[data-theme="light"] .logo-dark  { display: none;  }

[data-theme="dark"]  .logo-light { display: none;  }
[data-theme="dark"]  .logo-dark  { display: block; }

/* ── Reset ────────────────────────────────────────────────────────────────── */

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

/* ── Base ─────────────────────────────────────────────────────────────────── */

body {
  font-family: 'Noto Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  transition: background 0.2s, color 0.2s;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.subtitle {
  font-size: 0.8rem;
  color: var(--color-muted);
  text-align: center;
  max-width: 600px;
  line-height: 1.6;
}

/* ── Nav ──────────────────────────────────────────────────────────────────── */

.nav {
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-sep {
  color: var(--color-border);
  font-size: 0.85rem;
}

.nav-title {
  font-size: 0.8rem;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* ── Wordmark ─────────────────────────────────────────────────────────────── */

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-text);
  text-decoration: none;
}

.wordmark:hover { text-decoration: none; opacity: 0.85; }

/* ── Theme toggle ─────────────────────────────────────────────────────────── */

.theme-toggle {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  transition: border-color 0.2s, color 0.2s;
  flex-shrink: 0;
  align-self: unset;
  padding: 0;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  opacity: 1;
  background: transparent;
}

/* ── Demo content wrapper ─────────────────────────────────────────────────── */

.demo-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 24px 64px;
  gap: 40px;
  flex: 1;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

/* ── Form elements ────────────────────────────────────────────────────────── */

label {
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 5px;
}

textarea, input[type="text"], input[type="password"] {
  width: 100%;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  font-size: 0.875rem;
  font-family: inherit;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s;
}

textarea:focus, input:focus { border-color: var(--color-accent-dim); }

textarea {
  resize: vertical;
  line-height: 1.5;
}

textarea.mono {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.75rem;
  color: var(--color-code-text);
  word-break: break-all;
}

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

button {
  background: var(--color-accent);
  color: var(--color-bg);
  border: none;
  border-radius: 6px;
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.15s;
  align-self: flex-start;
  white-space: nowrap;
}

button:hover { opacity: 0.85; }
button:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
  background: transparent;
  opacity: 1;
  text-decoration: none;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button.secondary {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

button.secondary:hover { background: var(--color-surface-2); color: var(--color-text); opacity: 1; }
button.secondary:disabled { opacity: 0.3; }

button.danger {
  background: transparent;
  border: 1px solid rgba(248,113,113,0.3);
  color: var(--color-red);
}

button.danger:hover { background: rgba(248,113,113,0.08); opacity: 1; }
button.danger:disabled { opacity: 0.3; }

/* ── Status banners ───────────────────────────────────────────────────────── */

.status {
  font-size: 0.78rem;
  padding: 8px 12px;
  border-radius: 5px;
  display: none;
  line-height: 1.4;
}

.status.error {
  background: rgba(248,113,113,0.08);
  border: 1px solid rgba(248,113,113,0.25);
  color: var(--color-red);
  display: block;
}

.status.ok {
  background: rgba(74,222,128,0.08);
  border: 1px solid rgba(74,222,128,0.2);
  color: var(--color-green);
  display: block;
}

.status.warn {
  background: rgba(251,191,36,0.08);
  border: 1px solid rgba(251,191,36,0.2);
  color: var(--color-yellow);
  display: block;
}

/* ── Dividers ─────────────────────────────────────────────────────────────── */

.divider { border: none; border-top: 1px solid var(--color-border); }
hr { border: none; border-top: 1px solid var(--color-border); }

/* ── Layout helpers ───────────────────────────────────────────────────────── */

.row {
  display: flex;
  gap: 10px;
}

.row > div { flex: 1; }

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

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card.dim {
  opacity: 0.4;
  pointer-events: none;
}

.card h2 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* ── Step indicators ──────────────────────────────────────────────────────── */

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-num.done {
  background: rgba(74,222,128,0.08);
  border-color: rgba(74,222,128,0.2);
  color: var(--color-green);
}

.step {
  display: flex;
  align-items: center;
  gap: 10px;
}

.step-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ── Section labels ───────────────────────────────────────────────────────── */

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--color-border);
}

/* ── Connector ────────────────────────────────────────────────────────────── */

.connector {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0 4px;
}

.connector::before, .connector::after {
  content: '';
  flex: 1;
  border-top: 1px dashed var(--color-border);
}

/* ── Note boxes ───────────────────────────────────────────────────────────── */

.note {
  font-size: 0.72rem;
  color: var(--color-muted);
  line-height: 1.6;
  padding: 8px 12px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 5px;
}

/* ── Copy button ──────────────────────────────────────────────────────────── */

.copy-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 4px;
  align-self: flex-end;
  margin-top: -8px;
}

.copy-btn:hover { background: var(--color-surface-2); color: var(--color-text); opacity: 1; }

/* ── Key pair display ─────────────────────────────────────────────────────── */

.keypair-box {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.keypair-box.visible { display: flex; }

.keypair-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
}

.badge {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 3px;
  white-space: nowrap;
}

.badge.pub  { background: rgba(74,222,128,0.1);  color: var(--color-green); border: 1px solid rgba(74,222,128,0.2); }
.badge.priv { background: rgba(248,113,113,0.1); color: var(--color-red);   border: 1px solid rgba(248,113,113,0.2); }

.key-thumb {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.68rem;
  color: var(--color-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

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

.progress-bar {
  height: 3px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
  display: none;
}

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

.progress-fill {
  height: 100%;
  background: var(--color-green);
  width: 0%;
  transition: width 0.2s;
}

/* ── Tabs ─────────────────────────────────────────────────────────────────── */

.tabs {
  display: flex;
  gap: 2px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 3px;
  flex-wrap: wrap;
  justify-content: center;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 6px 16px;
  border-radius: 5px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
  align-self: unset;
  white-space: nowrap;
}

.tab-btn:hover  { background: var(--color-surface); color: var(--color-text); opacity: 1; }
.tab-btn.active { background: var(--color-surface-2); color: var(--color-text); }
.tab-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.tab-panel {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  width: 100%;
}

.tab-panel.active { display: flex; }

/* ── Two-panel grid (Seal + Files tabs) ───────────────────────────────────── */

.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  width: 100%;
  max-width: 900px;
}

@media (max-width: 640px) {
  .panels { grid-template-columns: 1fr; }
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel h2 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* ── Single-column layout (Account, Sign, Rekey, JWK tabs) ───────────────── */

.main {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
  max-width: 680px;
}

/* ── File drop zone ───────────────────────────────────────────────────────── */

.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: 8px;
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  text-align: center;
}

.dropzone:hover, .dropzone.drag-over {
  border-color: var(--color-accent-dim);
  background: var(--color-surface-2);
}

.dropzone input[type="file"] { display: none; }
.dropzone .icon { font-size: 1.8rem; line-height: 1; }
.dropzone .hint { font-size: 0.8rem; color: var(--color-muted); }

.file-info {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--color-muted);
  display: none;
  gap: 10px;
  align-items: center;
}

.file-info.visible { display: flex; }
.file-info .file-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--color-text); }
.file-info .file-size { color: var(--color-muted); white-space: nowrap; }

/* ── Account tab ──────────────────────────────────────────────────────────── */

textarea.mnemonic-box {
  font-size: 0.8rem;
  line-height: 1.8;
  color: var(--color-code-text);
  letter-spacing: 0.03em;
  min-height: 100px;
}

.mnemonic-warning {
  font-size: 0.72rem;
  color: #886020;
  background: #1a1505;
  border: 1px solid #3a2a10;
  border-radius: 5px;
  padding: 8px 12px;
  line-height: 1.5;
}

[data-theme="light"] .mnemonic-warning {
  color: #92400e;
  background: #fffbeb;
  border-color: #fde68a;
}

/* ── P2P tab ──────────────────────────────────────────────────────────────── */

.p2p-layout {
  display: grid;
  grid-template-columns: 1fr 80px 1fr;
  gap: 0;
  width: 100%;
  max-width: 980px;
  align-items: start;
}

@media (max-width: 700px) {
  .p2p-layout { grid-template-columns: 1fr; }
  .p2p-arrow  { display: none; }
}

.identity {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.identity.alice { border-top: 3px solid #818cf8; }
.identity.bob   { border-top: 3px solid #34d399; }

.identity h2 { font-size: 1rem; font-weight: 700; }
.alice h2 { color: #818cf8; }
.bob   h2 { color: #34d399; }

.p2p-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 120px;
  gap: 8px;
  color: var(--color-border);
  font-size: 0.7rem;
}

.p2p-arrow .arrow { font-size: 1.4rem; }

textarea.p2p-message  { min-height: 80px; }
textarea.p2p-received { min-height: 80px; color: var(--color-code-text); }

.packet {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 12px;
  display: none;
  flex-direction: column;
  gap: 6px;
}

.packet.visible { display: flex; }

.packet-row {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-size: 0.72rem;
}

.packet-row .field { color: var(--color-muted); white-space: nowrap; min-width: 90px; }

.packet-row .val {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.65rem;
  color: var(--color-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.verify-result {
  display: none;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
}

.verify-result.visible { display: flex; }
.verify-result .icon { font-size: 1.1rem; }
.verify-result.valid   .label { color: var(--color-green); }
.verify-result.invalid .label { color: var(--color-red); }

/* ── Sign tab ─────────────────────────────────────────────────────────────── */

.sig-box {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 14px;
  display: none;
  flex-direction: column;
  gap: 8px;
}

.sig-box.visible { display: flex; }

.sig-row { display: flex; align-items: baseline; gap: 10px; font-size: 0.72rem; }
.sig-field { color: var(--color-muted); white-space: nowrap; min-width: 80px; }

.sig-val {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.65rem;
  color: var(--color-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.verify-banner {
  border-radius: 7px;
  padding: 14px 16px;
  display: none;
  align-items: center;
  gap: 12px;
}

.verify-banner.visible { display: flex; }
.verify-banner.valid   { background: rgba(74,222,128,0.08);  border: 1px solid rgba(74,222,128,0.2); }
.verify-banner.invalid { background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.2); }
.verify-banner .icon { font-size: 1.4rem; line-height: 1; }
.verify-banner .text { display: flex; flex-direction: column; gap: 3px; }
.verify-banner .headline { font-size: 0.85rem; font-weight: 700; }
.verify-banner.valid   .headline { color: var(--color-green); }
.verify-banner.invalid .headline { color: var(--color-red); }
.verify-banner .detail { font-size: 0.74rem; color: var(--color-muted); }

/* ── Rekey tab ────────────────────────────────────────────────────────────── */

.blob-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.blob-compare .blob-label {
  font-size: 0.7rem;
  color: var(--color-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 5px;
}

.blob-compare textarea { min-height: 80px; }
.blob-old textarea { border-color: rgba(248,113,113,0.2); color: var(--color-muted); }
.blob-new textarea { border-color: rgba(74,222,128,0.2);  color: var(--color-code-text); }

/* ── JWK tab ──────────────────────────────────────────────────────────────── */

.generate-row { display: flex; gap: 8px; flex-wrap: wrap; }

.fields {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}

.field-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  border-bottom: 1px solid var(--color-border);
}

.field-row:last-child { border-bottom: none; }

.field-key {
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 9px 12px;
  background: var(--color-code-bg);
  border-right: 1px solid var(--color-border);
  display: flex;
  align-items: center;
}

.field-val {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.75rem;
  color: var(--color-text);
  padding: 9px 12px;
  word-break: break-all;
  line-height: 1.5;
}

.field-val.highlight { color: var(--color-code-text); }
.field-val.muted { color: var(--color-muted); font-style: italic; }
.field-val.warn  { color: var(--color-yellow); }

.fingerprint {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.8rem;
  color: var(--color-green);
  letter-spacing: 0.1em;
  background: rgba(74,222,128,0.06);
  border: 1px solid rgba(74,222,128,0.2);
  border-radius: 6px;
  padding: 12px 16px;
  word-break: break-all;
}

.fingerprint-label {
  font-size: 0.65rem;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

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

footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: auto;
}