/* ==========================================================================
   Claimcraft · Thesis Statement Generator
   Design system: Manuscript / Academic Journal
   Accessibility: WCAG 2.2 Level AA
   ========================================================================== */

:root,
[data-theme='light'] {
  /* Surfaces — warm parchment */
  --color-bg: #f6f1e8;
  --color-surface: #fbf7ef;
  --color-surface-2: #fffbf3;
  --color-surface-offset: #ece4d2;
  --color-divider: #d9cfb9;
  --color-border: #c9bfa6;

  /* Text — deep ink on cream, 4.5:1+ contrast */
  --color-text: #201a14;      /* ~ 15.9:1 on bg */
  --color-text-muted: #5b4e3c; /* ~ 6.5:1  on bg */
  --color-text-faint: #887a63; /* ~ 4.55:1 on bg */
  --color-text-inverse: #fbf7ef;

  /* Primary: deep claret / aubergine — scholarly, serious */
  --color-primary: #722f37;       /* ~ 8.0:1 on bg */
  --color-primary-hover: #5a242b;
  --color-primary-active: #3f181d;
  --color-primary-highlight: #ecd9d9;
  --color-primary-on: #fbf7ef;

  /* Feedback */
  --color-error: #8b1e1e;         /* ~ 7.5:1 on bg */
  --color-error-bg: #f4dcdc;
  --color-success: #2d5a2a;       /* ~ 7.7:1 on bg */
  --color-success-bg: #dde9d8;
  --color-warning: #8a5a00;       /* ~ 6.1:1 on bg */
  --color-warning-bg: #f2e4c6;

  /* Focus ring — uses primary */
  --focus-ring: 0 0 0 2px var(--color-bg), 0 0 0 5px var(--color-primary);

  /* Typography */
  --font-body: 'Satoshi', 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-display: 'Gambarino', 'Iowan Old Style', Georgia, 'Times New Roman', serif;

  /* Scale */
  --text-xs: clamp(0.78rem, 0.72rem + 0.2vw, 0.85rem);
  --text-sm: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.06rem);
  --text-md: clamp(1.08rem, 1rem + 0.4vw, 1.2rem);
  --text-lg: clamp(1.2rem, 1.05rem + 0.8vw, 1.55rem);
  --text-xl: clamp(1.6rem, 1.2rem + 1.6vw, 2.25rem);
  --text-2xl: clamp(2.1rem, 1.5rem + 2.8vw, 3.4rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --shadow-sm: 0 1px 2px oklch(0.25 0.02 60 / 0.08);
  --shadow-md: 0 6px 18px oklch(0.25 0.03 60 / 0.12);
  --shadow-lg: 0 18px 42px oklch(0.25 0.03 60 / 0.18);

  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-default: 960px;
  --content-narrow: 720px;
}

[data-theme='dark'] {
  --color-bg: #15110c;
  --color-surface: #1d1814;
  --color-surface-2: #231d18;
  --color-surface-offset: #2b241e;
  --color-divider: #342c25;
  --color-border: #4a3f35;

  --color-text: #f2ead9;        /* ~ 14:1 on bg */
  --color-text-muted: #c2b59a;   /* ~ 8.5:1 on bg */
  --color-text-faint: #8f8371;   /* ~ 4.8:1 on bg */
  --color-text-inverse: #15110c;

  --color-primary: #e0a3aa;       /* soft rose, ~ 8.9:1 on dark bg */
  --color-primary-hover: #edbac0;
  --color-primary-active: #f5cfd4;
  --color-primary-highlight: #3a2025;
  --color-primary-on: #15110c;

  --color-error: #f09a9a;
  --color-error-bg: #3a1a1a;
  --color-success: #9fc997;
  --color-success-bg: #1e2a1c;
  --color-warning: #e3c47a;
  --color-warning-bg: #2c2415;

  --focus-ring: 0 0 0 2px var(--color-bg), 0 0 0 5px var(--color-primary);

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.35);
  --shadow-md: 0 6px 18px oklch(0 0 0 / 0.5);
  --shadow-lg: 0 18px 42px oklch(0 0 0 / 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(
      800px 600px at 10% -10%,
      color-mix(in oklab, var(--color-primary) 6%, transparent),
      transparent
    ),
    radial-gradient(
      1000px 700px at 110% 10%,
      color-mix(in oklab, var(--color-primary-highlight) 20%, transparent),
      transparent
    );
  background-attachment: fixed;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}
input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  text-wrap: balance;
  letter-spacing: -0.01em;
}

p {
  text-wrap: pretty;
  max-width: 68ch;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover {
  color: var(--color-primary-hover);
}

/* Focus — visible 3:1+ against background */
*:focus {
  outline: none;
}
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
  box-shadow: var(--focus-ring);
}

/* Utility */
[hidden] {
  display: none !important;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-primary-on);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  transform: translateY(-110%);
  transition: transform var(--transition);
  z-index: 100;
  font-weight: 600;
}
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.wrap {
  width: 100%;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* Header */
.site-header {
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  background: color-mix(in oklab, var(--color-bg) 80%, transparent);
  backdrop-filter: saturate(130%) blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
}
.brand:hover {
  color: var(--color-text);
}
.logo {
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand-name {
  font-family: var(--font-display);
  font-size: var(--text-md);
  letter-spacing: 0.01em;
}

.header-actions {
  display: flex;
  gap: var(--space-2);
}
.icon-btn {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}
.icon-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

/* Hero */
.hero {
  padding-block: clamp(var(--space-10), 6vw, var(--space-20)) var(--space-8);
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.hero-title {
  font-size: var(--text-2xl);
  max-width: 22ch;
  margin-bottom: var(--space-5);
}
.hero-title em {
  font-style: italic;
  color: var(--color-primary);
}
.hero-lede {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-5);
}
.trust-line {
  display: inline-flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  max-width: 60ch;
}
.trust-line svg {
  color: var(--color-primary);
  margin-top: 2px;
  flex-shrink: 0;
}

/* Workspace */
.workspace {
  padding-block: var(--space-6) var(--space-16);
  display: grid;
  gap: var(--space-8);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-5), 3vw, var(--space-8));
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}
.card-sub {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
}

.field-group {
  border: none;
  margin-bottom: var(--space-6);
  display: grid;
  gap: var(--space-4);
}
.field-group:last-of-type {
  margin-bottom: var(--space-6);
}
.group-legend {
  font-family: var(--font-display);
  font-size: var(--text-md);
  padding-top: var(--space-4);
  padding-bottom: var(--space-2);
  border-top: 1px solid var(--color-divider);
  width: 100%;
  color: var(--color-text);
}
.field-group:first-of-type .group-legend {
  border-top: none;
  padding-top: 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 640px) {
  .field-row {
    grid-template-columns: 1fr 1fr;
  }
}

label {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.req {
  color: var(--color-primary);
  margin-left: 2px;
}
.help {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

input[type='text'],
input[type='password'],
textarea,
select {
  width: 100%;
  font-size: var(--text-base);
  padding: var(--space-3) var(--space-4);
  min-height: 44px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
textarea {
  resize: vertical;
  line-height: 1.5;
  font-family: var(--font-body);
}
input:hover,
textarea:hover,
select:hover {
  border-color: var(--color-text-muted);
}
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 30%, transparent);
}
input:invalid:not(:placeholder-shown),
textarea:invalid:not(:placeholder-shown) {
  border-color: var(--color-error);
}
input::placeholder,
textarea::placeholder {
  color: var(--color-text-faint);
  opacity: 1;
}

select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--color-text-muted) 50%),
    linear-gradient(135deg, var(--color-text-muted) 50%, transparent 50%);
  background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: var(--space-10);
}

.input-with-action {
  display: flex;
  gap: var(--space-2);
}
.input-with-action input {
  flex: 1;
}

.toggles {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
}
.check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  font-weight: 500;
  font-size: var(--text-sm);
  line-height: 1.5;
  min-height: 24px;
}
.check input[type='checkbox'] {
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition), background var(--transition);
}
.check input[type='checkbox']:hover {
  border-color: var(--color-primary);
}
.check input[type='checkbox']:checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.check input[type='checkbox']:checked::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 1px;
  width: 6px;
  height: 11px;
  border: solid var(--color-primary-on);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.check input[type='checkbox']:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Buttons */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition),
    transform var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-on);
  border-color: var(--color-primary);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.btn-primary:active:not(:disabled) {
  background: var(--color-primary-active);
  transform: translateY(1px);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-muted);
}
.btn-sm {
  min-height: 40px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.btn-primary[data-loading='true'] .btn-spinner {
  display: inline-block;
}
.btn-primary[data-loading='true'] .btn-label {
  opacity: 0.85;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Form error */
.form-error {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
  font-size: var(--text-sm);
  font-weight: 500;
}

/* Results */
.results {
  display: grid;
  gap: var(--space-5);
}
.results-head h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}
.results-sub {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.results-list {
  display: grid;
  gap: var(--space-5);
}
.thesis-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: var(--space-4);
}
.thesis-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.thesis-badge {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--color-text-muted);
}
.thesis-rank {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
}
[data-theme='dark'] .thesis-rank {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}
.thesis-body {
  font-family: var(--font-display);
  font-size: var(--text-md);
  line-height: 1.45;
  color: var(--color-text);
}
.thesis-why {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
}
.thesis-why strong {
  color: var(--color-text);
  font-weight: 600;
}
.thesis-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.copied {
  color: var(--color-success);
  font-weight: 600;
  font-size: var(--text-xs);
  align-self: center;
}

/* Notes */
.notes {
  padding-block: var(--space-8) var(--space-16);
}
.notes h2 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}
.notes ul {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  max-width: 68ch;
}
.notes li {
  padding-left: var(--space-6);
  position: relative;
  color: var(--color-text-muted);
}
.notes li::before {
  content: '§';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-primary);
  font-family: var(--font-display);
  font-weight: 600;
}
.notes strong {
  color: var(--color-text);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-6);
  background: var(--color-surface);
}
.footer-row {
  display: grid;
  gap: var(--space-3);
}
.foot-small {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  max-width: none;
}
.foot-small.muted {
  color: var(--color-text-faint);
}
.foot-small a {
  color: var(--color-text-muted);
}
.foot-small a:hover {
  color: var(--color-primary);
}

/* Dialog */
dialog {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 0;
  max-width: 520px;
  width: calc(100vw - 2rem);
  box-shadow: var(--shadow-lg);
}
dialog::backdrop {
  background: color-mix(in oklab, var(--color-text) 60%, transparent);
  backdrop-filter: blur(2px);
}
.dialog-inner {
  padding: var(--space-6);
  display: grid;
  gap: var(--space-4);
}
.dialog-inner h2 {
  font-size: var(--text-lg);
}
.dialog-inner p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast / forced colors (WCAG 2.2 AA — forced-colors support) */
@media (forced-colors: active) {
  .btn-primary,
  .btn-ghost {
    border: 1px solid ButtonText;
  }
  input,
  textarea,
  select {
    border: 1px solid ButtonText;
  }
  *:focus-visible {
    outline: 2px solid Highlight;
  }
}