/* ==========================================================================
   IamGroot -- voice steganography web UI
   Design language: a "field lab" crossed with a security console. Deep
   forest ink background, moss/bark botanical accents for the "growing a
   voice" metaphor, teal for anything cryptographic, amber as the single
   warm signal color for primary actions and the waveform/growth-ring motif.
   ========================================================================== */

:root {
  --ink: #101c15;
  --ink-2: #16241b;
  --panel: #1b2b21;
  --panel-raised: #22362a;
  --hairline: #33493b;
  --hairline-soft: #26382d;

  --text-primary: #edf2e9;
  --text-secondary: #a7bda9;
  --text-tertiary: #6f8770;

  --moss: #4f7942;
  --moss-bright: #86c26a;
  --bark: #8a5a34;
  --amber: #e8a33d;
  --amber-dim: #b57a2c;
  --signal-teal: #4fb0a5;
  --signal-teal-dim: #366d66;
  --danger: #e07856;
  --danger-bg: #2c1c17;

  --font-display: "Fraunces", "Iowan Old Style", serif;
  --font-body: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;

  --shadow-panel: 0 1px 0 rgba(237, 242, 233, 0.04) inset,
                   0 20px 40px -24px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

::selection { background: var(--amber); color: var(--ink); }

html { color-scheme: dark; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ink);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--font-mono); }

a { color: var(--signal-teal); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  border-radius: 4px;
}

/* -------------------------------------------------------------------- */
/* Ambient background: a very quiet radial wash + faint grain, no motion */
/* -------------------------------------------------------------------- */
.root-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 900px 500px at 18% -8%, rgba(79, 121, 66, 0.22), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 10%, rgba(79, 176, 165, 0.10), transparent 55%),
    var(--ink);
}

/* -------------------------------------------------------------------- */
/* Header                                                                */
/* -------------------------------------------------------------------- */
.site-head {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 24px 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

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

.brand-mark { flex-shrink: 0; }

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.site-tagline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

/* -------------------------------------------------------------------- */
/* Hero / intro                                                         */
/* -------------------------------------------------------------------- */
.stage {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

.intro {
  padding: 56px 0 40px;
}

.intro h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.1rem, 4.2vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.intro p {
  margin: 0;
  max-width: 54ch;
  color: var(--text-secondary);
  font-size: 1.03rem;
}

/* -------------------------------------------------------------------- */
/* Tab switcher                                                         */
/* -------------------------------------------------------------------- */
.switcher {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
}

.switcher-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 18px;
  background: var(--panel);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.96rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.switcher-btn:hover { border-color: var(--hairline); color: var(--text-primary); }

.switcher-btn.is-active {
  background: var(--panel-raised);
  border-color: var(--moss);
  color: var(--text-primary);
}

.switcher-index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  padding: 2px 7px;
  border: 1px solid var(--amber-dim);
  border-radius: 5px;
}

.switcher-btn.is-active .switcher-index { color: var(--moss-bright); border-color: var(--moss); }

/* -------------------------------------------------------------------- */
/* Vine divider (signature squiggle -- also reads as a waveform)        */
/* -------------------------------------------------------------------- */
.vine-divider { margin: 4px 0 28px; opacity: 0.7; }
.vine-divider svg { width: 100%; height: 20px; display: block; }

/* -------------------------------------------------------------------- */
/* Panels                                                                */
/* -------------------------------------------------------------------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-panel);
}

.panel.is-hidden { display: none; }

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}

textarea#message {
  width: 100%;
  resize: vertical;
  min-height: 108px;
  background: var(--ink-2);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 14px 16px;
  transition: border-color 0.15s ease;
}

textarea#message:focus {
  border-color: var(--moss);
  outline: none;
}

textarea#message::placeholder { color: var(--text-tertiary); }

.field-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 10px 2px 22px;
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

#char-counter.is-over { color: var(--danger); }

/* -------------------------------------------------------------------- */
/* Password row + toggle                                                */
/* -------------------------------------------------------------------- */
.password-row { margin-bottom: 24px; }

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  margin-bottom: 4px;
}

.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }

.toggle-track {
  width: 36px;
  height: 20px;
  border-radius: 999px;
  background: var(--ink-2);
  border: 1px solid var(--hairline);
  position: relative;
  transition: background 0.15s ease, border-color 0.15s ease;
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-tertiary);
  transition: transform 0.18s ease, background 0.18s ease;
}

.toggle input:checked + .toggle-track {
  background: var(--signal-teal-dim);
  border-color: var(--signal-teal);
}

.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: var(--signal-teal);
}

.toggle-label { font-size: 0.9rem; color: var(--text-secondary); }

.password-field {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--ink-2);
  border: 1px solid var(--signal-teal-dim);
  border-radius: var(--radius-md);
  max-width: 360px;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.password-field.is-hidden { display: none; }

.password-field input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.password-field input:focus { outline: none; }
.password-field input::placeholder { color: var(--text-tertiary); }

/* -------------------------------------------------------------------- */
/* Dropzone (decode)                                                    */
/* -------------------------------------------------------------------- */
.dropzone {
  border: 1.5px dashed var(--hairline);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: border-color 0.15s ease, background 0.15s ease;
  margin-bottom: 24px;
}

.dropzone svg { margin-bottom: 10px; }

.dropzone p { margin: 0; font-size: 0.92rem; }
.dropzone strong { color: var(--text-primary); font-weight: 600; }

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--moss);
  background: rgba(79, 121, 66, 0.06);
}

.dropzone.is-dragover {
  border-color: var(--amber);
  background: rgba(232, 163, 61, 0.08);
}

.dropzone-file {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--moss-bright);
}

/* -------------------------------------------------------------------- */
/* Primary action button                                                */
/* -------------------------------------------------------------------- */
.grow-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  background: var(--amber);
  color: #221505;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
  box-shadow: 0 8px 20px -10px rgba(232, 163, 61, 0.55);
}

.grow-btn:hover { background: #f0b158; }
.grow-btn:active { transform: translateY(1px); }

.grow-btn:disabled {
  background: var(--panel-raised);
  color: var(--text-tertiary);
  box-shadow: none;
  cursor: progress;
}

.grow-btn-icon { transition: transform 0.2s ease; }
.grow-btn:hover .grow-btn-icon { transform: translateY(-2px); }

/* -------------------------------------------------------------------- */
/* Result area (status / success / error)                               */
/* -------------------------------------------------------------------- */
.result-area:empty { display: none; }

.result-area {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--hairline-soft);
  animation: rise 0.2s ease;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.status-line {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  flex-shrink: 0;
  animation: pulse 1.1s ease-in-out infinite;
}

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

.result-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-card.is-error .result-headline { color: var(--danger); }

.result-headline {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--moss-bright);
}

.result-card.is-error {
  background: var(--danger-bg);
  border: 1px solid #4a2c22;
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.result-card.is-error p {
  margin: 6px 0 0;
  color: #f0c3af;
  font-size: 0.92rem;
}

.revealed-message {
  background: var(--ink-2);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-md);
  padding: 18px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
}

.result-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.86rem;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
}

.ghost-btn:hover { border-color: var(--moss-bright); color: var(--text-primary); }

audio.result-audio {
  width: 100%;
  height: 40px;
  border-radius: var(--radius-sm);
}

.encrypted-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--signal-teal);
  border: 1px solid var(--signal-teal-dim);
  border-radius: 999px;
  padding: 4px 10px;
  width: fit-content;
}

/* -------------------------------------------------------------------- */
/* Footer                                                                */
/* -------------------------------------------------------------------- */
.site-foot {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px 56px;
}

.site-foot p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-tertiary);
  line-height: 1.6;
  max-width: 62ch;
}

/* -------------------------------------------------------------------- */
/* Responsive                                                            */
/* -------------------------------------------------------------------- */
@media (max-width: 560px) {
  .site-head { padding: 28px 18px 0; }
  .stage { padding: 0 18px 72px; }
  .intro { padding: 40px 0 28px; }
  .panel { padding: 20px; }
  .switcher-btn { font-size: 0.88rem; padding: 12px 10px; }
  .switcher-index { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .status-dot { animation: none; }
  .result-area { animation: none; }
}