/* ==========================================================================
   Devnagri TTS Playground — Devnagri brand design system
   Matches https://devnagri.com/ — Inter/Montserrat/Poppins,
   #05A1F4 primary blue, #012641 text, pill buttons (80px radius).
   ========================================================================== */

/* --- Design tokens (mirrors Devnagri.com) --- */
:root {
  /* Colors — exact from devnagri.com CSS */
  --blue-color: #05A1F4;
  --text-color: #012641;
  --white-color: #fff;
  --bs-primary: #05A1F4;
  --bs-primary-hover: #012641;
  --bs-primary-rgb: 5, 161, 244;
  --bs-body-bg: #ffffff;
  --bs-body-color: #012641;
  --bs-secondary-color: #6c757d;
  --bs-border-color: #dee2e6;
  --bs-border-color-translucent: rgba(0, 0, 0, 0.175);
  --bs-success: #198754;
  --bs-danger: #dc3545;
  --bs-warning: #ffc107;
  --bs-light: #f8f9fa;
  --bs-light-rgb: 248, 249, 250;

  /* Typography — exact from devnagri.com */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-heading: "Montserrat", sans-serif;
  --font-accent: "Poppins", "Inter", system-ui, sans-serif;

  /* Radius */
  --bs-border-radius: 0.375rem;       /* 6px */
  --bs-border-radius-sm: 0.25rem;     /* 4px */
  --bs-border-radius-lg: 0.5rem;      /* 8px */
  --bs-border-radius-xl: 0.75rem;     /* 12px */
  --btn-radius: 80px;                 /* Devnagri pill buttons */

  /* Shadows */
  --bs-box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --bs-box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --bs-box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  --btn-hover-shadow: 0 15px 25px rgba(37, 99, 235, 0.3);

  /* Focus ring */
  --bs-focus-ring-color: rgba(5, 161, 244, 0.25);

  /* Layout */
  --navbar-height: 64px;
  --max-width: 1320px;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--bs-body-color);
  background-color: var(--bs-body-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 600; line-height: 1.3; color: var(--text-color); }

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

button { font-family: inherit; cursor: pointer; }

.hidden { display: none !important; }

/* --- Navbar --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1030;
  height: var(--navbar-height);
  background: var(--bs-body-bg);
  border-bottom: 1px solid var(--bs-border-color);
  box-shadow: var(--bs-box-shadow-sm);
}

.navbar-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand { display: flex; align-items: center; gap: 0.75rem; }

.brand-logo { display: flex; align-items: center; }

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

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-color);
  line-height: 1.2;
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--bs-secondary-color);
  letter-spacing: 0.02em;
}

.navbar-actions { display: flex; align-items: center; gap: 1rem; }

/* --- Env badge --- */
.env-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--bs-secondary-color);
  background: var(--bs-light);
  border: 1px solid var(--bs-border-color);
  border-radius: 2rem;
}

.env-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bs-secondary-color);
  flex-shrink: 0;
}

.env-badge.env-ok .env-dot { background: var(--bs-success); }
.env-badge.env-ok { color: var(--bs-success); }
.env-badge.env-err .env-dot { background: var(--bs-danger); }
.env-badge.env-err { color: var(--bs-danger); }

/* --- Icon button --- */
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius);
  background: var(--bs-body-bg);
  color: var(--bs-secondary-color);
  font-size: 1.125rem;
  transition: all 0.15s ease;
}

.icon-button:hover {
  background: var(--bs-light);
  color: var(--bs-body-color);
  border-color: var(--bs-border-color-translucent);
}

/* --- Main container --- */
.main-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}

/* --- Page header --- */
.page-header { margin-bottom: 2rem; }

.page-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--bs-primary);
  margin-bottom: 0.5rem;
}

.page-subtitle {
  font-size: 1rem;
  color: var(--bs-secondary-color);
  max-width: 60ch;
}

/* --- Layout grid --- */
.layout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 991.98px) {
  .layout-grid { grid-template-columns: 1fr; }
}

/* --- Card --- */
.card {
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius-lg);
  box-shadow: var(--bs-box-shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 1.125rem 1.5rem;
  border-bottom: 1px solid var(--bs-border-color);
  background: var(--bs-light);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--bs-primary);
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.card-title i { color: var(--bs-primary); font-size: 1rem; }

/* --- Step badges --- */
.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  background: var(--bs-primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.step-badge-sm {
  width: 22px;
  height: 22px;
  font-size: 0.75rem;
}

.card-body { padding: 1.5rem; }

/* --- Form fields --- */
.form-field { margin-bottom: 1.25rem; }
.form-field:last-child { margin-bottom: 0; }

.form-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.form-hint {
  font-size: 0.8125rem;
  color: var(--bs-secondary-color);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.form-hint strong { color: var(--bs-body-color); }

/* --- Form controls (Bootstrap-matching) --- */
.form-control {
  display: block;
  width: 100%;
  padding: 0.5625rem 0.875rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--bs-body-color);
  background-color: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  appearance: none;
}

.form-control::placeholder { color: var(--bs-secondary-color); opacity: 1; }

.form-control:focus {
  outline: 0;
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 0.25rem var(--bs-focus-ring-color);
}

textarea.form-control { resize: vertical; min-height: 80px; }

/* --- Buttons (Bootstrap 5 matching, slightly larger) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--btn-radius);
  transition: all 0.7s cubic-bezier(0.3, 0, 0.3, 1);
  cursor: pointer;
  user-select: none;
}

.btn:disabled { opacity: 0.65; pointer-events: none; }

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  border-radius: var(--btn-radius);
}

.btn-lg {
  padding: 0.75rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--btn-radius);
}

.btn-primary {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--bs-primary-hover);
  border-color: var(--bs-primary-hover);
  color: #fff;
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: var(--btn-hover-shadow);
}

.btn-primary:focus {
  outline: 0;
  box-shadow: 0 0 0 0.25rem var(--bs-focus-ring-color);
}

.btn-outline-primary {
  background-color: transparent;
  border-color: var(--bs-primary);
  color: var(--bs-primary);
}

.btn-outline-primary:hover {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: var(--btn-hover-shadow);
}

.btn-outline-secondary {
  background-color: transparent;
  border-color: var(--bs-secondary-color);
  color: var(--bs-secondary-color);
}

.btn-outline-secondary:hover {
  background-color: var(--bs-secondary-color);
  border-color: var(--bs-secondary-color);
  color: #fff;
}

.btn-link {
  background: none;
  border: none;
  color: var(--bs-primary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  text-decoration: none;
  cursor: pointer;
}

.btn-link:hover { color: var(--bs-primary-hover); text-decoration: underline; }

/* --- File row --- */
.file-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.file-name {
  font-size: 0.875rem;
  color: var(--bs-secondary-color);
  flex: 1 1 auto;
  min-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Recording UI --- */
.ref-record-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
  padding: 0.625rem 1rem;
  background: #fff5f5;
  border: 1px solid #ffe0e0;
  border-radius: var(--bs-border-radius);
}

.record-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--bs-danger);
}

.record-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bs-danger);
  animation: pulse-dot 1s ease-in-out infinite;
}

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

.record-timer {
  font-family: var(--font-sans);
  font-variant-numeric: tabular-nums;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--bs-body-color);
}

.ref-audio-preview {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--bs-light);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius);
}

.ref-audio-preview audio { width: 100%; }

/* --- Accordion --- */
.accordion {
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.accordion:last-child { margin-bottom: 0; }

.accordion-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.125rem;
  background: var(--bs-light);
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-color);
  list-style: none;
  user-select: none;
  transition: background 0.15s ease;
}

.accordion-summary:hover { background: #eef1f4; }

.accordion-summary::-webkit-details-marker { display: none; }

.accordion-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.accordion-title i { color: var(--bs-primary); font-size: 0.875rem; }

.accordion-hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--bs-secondary-color);
}

.accordion-body { padding: 1.125rem; }

/* --- Step connector line inside input card --- */
.input-card .accordion {
  position: relative;
}
.input-card .accordion::before {
  content: "";
  position: absolute;
  left: 1.25rem;
  top: -1.25rem;
  height: 1.25rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--bs-primary), var(--bs-border-color));
  opacity: 0.4;
}

/* --- Token tabs --- */
.token-tabs {
  display: flex;
  gap: 0.375rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.token-tab {
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--bs-secondary-color);
  background: var(--bs-light);
  border: 1px solid var(--bs-border-color);
  border-radius: 2rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.token-tab:hover { color: var(--bs-primary); border-color: var(--bs-primary); }

.token-tab.active {
  background: var(--bs-primary);
  border-color: var(--bs-primary);
  color: #fff;
}

/* --- Token grid --- */
.token-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.5rem;
}

.token-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.4375rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-color);
  background: var(--bs-light);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--btn-radius);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}

.token-chip:hover {
  background: var(--bs-primary);
  border-color: var(--bs-primary);
  color: #fff;
}

.token-chip code {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.75rem;
  opacity: 0.7;
}

/* --- Insert toast --- */
.insert-toast {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--bs-success);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.insert-toast.show { opacity: 1; }

/* --- Param grid --- */
.param-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.span-2 { grid-column: span 2; }

@media (max-width: 575.98px) {
  .param-grid { grid-template-columns: 1fr; }
  .span-2 { grid-column: span 1; }
}

/* --- Output controls --- */
.output-controls {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

/* --- Synth button (larger, prominent) --- */
#synth-button {
  min-width: 200px;
  padding: 13px 32px;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--btn-radius);
  box-shadow: var(--bs-box-shadow-sm);
  transition: all 0.7s cubic-bezier(0.3, 0, 0.3, 1);
}

#synth-button:hover {
  background-color: var(--bs-primary-hover);
  transform: translateY(-5px);
  box-shadow: var(--btn-hover-shadow);
}

#synth-button:active { transform: translateY(0); }

#synth-button.synthesizing {
  opacity: 0.7;
  pointer-events: none;
}

#synth-button.synthesizing .primary-label::after {
  content: "…";
  display: inline;
}

/* --- Stream toggle (larger) --- */
.stream-toggle {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.form-check-input {
  width: 3.5em;
  height: 1.75em;
  cursor: pointer;
  background-color: var(--bs-border-color);
  border: none;
  border-radius: 2em;
  position: relative;
  transition: background-color 0.2s ease;
  appearance: none;
  flex-shrink: 0;
}

.form-check-input::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: calc(1.75em - 4px);
  height: calc(1.75em - 4px);
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s ease;
  box-shadow: var(--bs-box-shadow-sm);
}

.form-check-input:checked {
  background-color: var(--bs-primary);
}

.form-check-input:checked::before {
  transform: translateX(1.75em);
}

.form-check-input:focus {
  outline: 0;
  box-shadow: 0 0 0 0.25rem var(--bs-focus-ring-color);
}

.stream-toggle-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-color);
}

.stream-hint {
  font-size: 0.8125rem;
  color: var(--bs-secondary-color);
  margin-top: 0.5rem;
  margin-bottom: 0;
}

/* --- Status row --- */
.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--bs-secondary-color);
  font-family: var(--font-sans);
}

.status-prefix { color: var(--bs-primary); font-weight: 700; }

.status.synthesizing { color: var(--bs-warning); }
.status.synthesizing .status-prefix { color: var(--bs-warning); }
.status.success { color: var(--bs-success); }
.status.success .status-prefix { color: var(--bs-success); }
.status.error { color: var(--bs-danger); }
.status.error .status-prefix { color: var(--bs-danger); }

/* --- Mute button --- */
.icon-btn { width: 36px; height: 36px; padding: 0; }

.icon-btn .icon-mute { display: none; }
.icon-btn[aria-pressed="true"] .icon-sound { display: none; }
.icon-btn[aria-pressed="true"] .icon-mute { display: inline-block; }

/* --- Audio row --- */
.audio-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.audio-row audio {
  flex: 1 1 auto;
  min-width: 200px;
  height: 42px;
}

.audio-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* --- History --- */
.history-section { margin-top: 2rem; }

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.history-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--bs-primary);
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.history-title i { color: var(--bs-primary); font-size: 0.875rem; }

.history-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.history-empty {
  padding: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--bs-secondary-color);
  background: var(--bs-light);
  border: 1px dashed var(--bs-border-color);
  border-radius: var(--bs-border-radius);
}

.history-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bs-light);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius);
  transition: border-color 0.15s ease;
}

.history-item:hover { border-color: var(--bs-primary); }

.history-item audio { height: 36px; flex: 1 1 auto; min-width: 150px; }

.history-item-meta {
  font-size: 0.75rem;
  color: var(--bs-secondary-color);
  white-space: nowrap;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--bs-border-color);
  padding: 1.5rem 0;
  margin-top: 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--bs-secondary-color);
}

/* --- Login overlay --- */
.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f0f7ff 0%, #e6f4ff 100%);
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.login-overlay.login-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-card {
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--bs-border-radius-lg);
  box-shadow: 0 8px 30px rgba(1, 38, 65, 0.12);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.login-logo {
  margin: 0 auto 1.5rem;
  display: block;
}

.login-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--bs-primary);
  margin-bottom: 0.5rem;
}

.login-subtitle {
  font-size: 0.875rem;
  color: var(--bs-secondary-color);
  margin-bottom: 1.5rem;
}

.login-form {
  text-align: left;
}

.login-form .form-field {
  margin-bottom: 1rem;
}

.login-btn {
  width: 100%;
  margin-top: 0.5rem;
}

.login-error {
  color: var(--bs-danger);
  font-size: 0.8125rem;
  font-weight: 500;
  min-height: 1.2em;
  margin-bottom: 0.5rem;
}

/* --- Responsive --- */
@media (max-width: 767.98px) {
  .navbar-container { padding: 0 1rem; }
  .main-container { padding: 1.5rem 1rem 2rem; }
  .page-title { font-size: 1.5rem; }
  .card-body { padding: 1.125rem; }
  .output-controls { flex-direction: column; align-items: stretch; }
  #synth-button { width: 100%; }
  .status-row { flex-direction: column-reverse; align-items: flex-start; }
}