@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Lora:wght@400;600&family=Merriweather:wght@400;700&family=Open+Sans:wght@400;700&family=PT+Serif:wght@400;700&family=Roboto:wght@400;700&family=Source+Serif+4:wght@400;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:wght@400&display=swap');

:root {
  color-scheme: light dark;
  --color-bg: #f8fafc;
  --color-bg-alt: #ffffff;
  --color-text: #0f172a;
  --color-muted: #475569;
  --color-border: #cbd5f5;
  --color-primary: #2563eb;
  --color-primary-strong: #1d4ed8;
  --color-primary-contrast: #ffffff;
  --reader-selection-color: var(--color-primary);
  --reader-selection-bg: rgba(37, 99, 235, 0.12);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.12);
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Iowan Old Style', 'Palatino Linotype', 'Palatino', 'Times New Roman', serif;
  --font-sans: 'Inter', 'Helvetica Neue', Arial, system-ui, sans-serif;
  --font-roboto: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-open-sans: 'Open Sans', 'Segoe UI', system-ui, sans-serif;
  --font-lora: 'Lora', 'Times New Roman', serif;
  --font-merriweather: 'Merriweather', 'Georgia', serif;
  --font-georgia: 'Georgia', 'Times New Roman', serif;
  --font-pt-serif: 'PT Serif', 'Times New Roman', serif;
  --font-source-serif: 'Source Serif 4', 'Times New Roman', serif;
  --font-scale: 1;
  --line-height-base: 1.6;
}

[data-theme='dark'] {
  --color-bg: #0e1724;
  --color-bg-alt: #152235;
  --color-text: #edf2f7;
  --color-muted: #cfd8e3;
  --color-border: #203047;
  --color-primary: #8ec5ff;
  --color-primary-strong: #cfe6ff;
  --color-primary-contrast: #0c1624;
  --shadow-sm: 0 6px 20px rgba(14, 23, 36, 0.42);
}

[data-theme='midnight'] {
  --color-bg: #131b2b;
  --color-bg-alt: #1d2840;
  --color-text: #e8edf5;
  --color-muted: #c6d1e1;
  --color-border: #2b3a55;
  --color-primary: #8bb7ff;
  --color-primary-strong: #d5e6ff;
  --color-primary-contrast: #0b162a;
  --shadow-sm: 0 6px 20px rgba(19, 27, 43, 0.38);
}

html {
  font-size: calc(16px * var(--font-scale));
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height-base);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  padding: 1.5rem clamp(1rem, 3vw, 2.5rem);
  backdrop-filter: blur(12px);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(79, 70, 229, 0.12));
  color: var(--color-text);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.home-button {
  appearance: none;
  border: 0;
  border-radius: var(--radius-md);
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.12);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
  cursor: pointer;
}

.home-button:hover,
.home-button:focus-visible {
  transform: translateY(-1px);
  outline: none;
  color: var(--color-primary-contrast);
  background: var(--color-primary);
}

.home-button.active {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

.app-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: clamp(1rem, 3vw, 2.5rem);
}

.tab-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

.tab-nav button {
  appearance: none;
  border: 0;
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-muted);
  background: var(--color-bg-alt);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, color 0.2s ease, background 0.2s ease;
  cursor: pointer;
  position: relative;
}

.tab-nav button:hover,
.tab-nav button:focus-visible {
  color: var(--color-text);
  transform: translateY(-1px);
  outline: none;
}

.tab-nav button.active {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.25);
}

.tab-nav button[disabled] {
  cursor: not-allowed;
  opacity: 0.6;
}

.tab-panels {
  position: relative;
  flex: 1;
}

.tab-panel {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
}

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

.card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: clamp(1rem, 2vw, 1.75rem);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

label {
  font-weight: 600;
  display: block;
  margin-bottom: 0.25rem;
}

select,
input,
textarea,
button {
  font-family: inherit;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35em;
  min-width: 2.25em;
  padding: 0.45em;
  font-size: 1em;
  line-height: 1;
}

.icon-button .material-symbols-outlined {
  font-family: 'Material Symbols Outlined', sans-serif;
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  font-size: 1.25em;
  line-height: 1;
}

select,
input,
textarea {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: inherit;
  font-size: 1rem;
}

input[type='checkbox'],
input[type='radio'] {
  width: auto;
  min-width: 1.25rem;
  padding: 0;
}

.ai-prompt-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  margin-bottom: 0.75rem;
  background: var(--color-bg);
}

.ai-prompt-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.ai-prompt-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 0.75rem;
}

.ai-prompt-empty {
  padding: 0.5rem 0;
}

.ai-response {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  margin-top: 0.25rem;
  min-height: 220px;
  font-size: 1.02rem;
  line-height: calc(var(--line-height-base) * 1.05);
  white-space: normal;
  overflow-x: auto;
}

.ai-markdown h1,
.ai-markdown h2,
.ai-markdown h3 {
  margin: 0.35rem 0;
}

.ai-markdown p {
  margin: 0.25rem 0;
}

.ai-markdown ul {
  margin: 0.4rem 0;
  padding-left: 1.25rem;
}

.ai-markdown code {
  background: var(--color-bg);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.ai-code {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.6rem;
  overflow-x: auto;
  margin: 0.4rem 0;
}


.section-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.dialog-actions--sticky {
  position: sticky;
  bottom: 0;
  background: var(--color-bg);
  padding-top: 0.75rem;
  margin-top: 0.5rem;
  border-top: 1px solid var(--color-border);
  z-index: 1;
}

.ai-history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.ai-history {
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  margin-top: 0.5rem;
  max-height: 320px;
  min-height: 180px;
  overflow: auto;
  opacity: 0.85;
  position: relative;
}

.ai-history.collapsed {
  max-height: 140px;
  overflow: hidden;
}

.ai-history.collapsed::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 36px;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, var(--color-bg-alt) 100%);
  pointer-events: none;
}

.ai-history-entry {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.ai-history-entry:last-child {
  border-bottom: none;
}

.ai-history-role {
  font-weight: 700;
  margin: 0;
}

.ai-history-text {
  margin: 0;
}

.ai-history-meta {
  margin: 0.35rem 0 0 0;
  padding-left: 1.1rem;
  color: var(--color-text-muted);
}

.ai-history-meta li {
  margin: 0.15rem 0;
}

.ai-history-top {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: baseline;
}

.ai-history-time {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.ai-history-separator {
  border-top: 1px solid var(--color-border);
  margin: 0.35rem 0;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

button {
  border-radius: var(--radius-sm);
  border: 0;
  padding: 0.65rem 1rem;
  font-size: 1rem;
  line-height: var(--line-height-base);
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

button.primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

button.secondary {
  background: var(--color-bg-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

button:hover,
button:focus-visible {
  opacity: 0.9;
  outline: none;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.list-item {
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: 1rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.toast {
  position: fixed;
  inset-inline: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(20px);
  background: rgba(37, 99, 235, 0.95);
  color: #fff;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.3;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 100;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.app-dialog::backdrop {
  background: rgba(15, 23, 42, 0.4);
}

.app-dialog {
  border: 0;
  border-radius: var(--radius-lg);
  padding: 0;
  max-width: min(480px, 90vw);
  box-shadow: var(--shadow-sm);
  background: var(--color-bg-alt);
}

.app-dialog.dialog-wide {
  width: min(1220px, 98vw);
  max-width: min(1220px, 98vw);
}

.app-dialog.dialog-wide .dialog-body {
  max-height: 80vh;
  overflow: auto;
}

.dialog-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  color: var(--color-text);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.inline-field {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.inline-field label {
  margin: 0;
}

.inline-field span {
  flex: 1;
}

@media (max-width: 720px) {
  .tab-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}