/* ==========================================================================
   SpamCheck — design tokens from websquadesign.md (Agnostic SaaS Blueprint)
   LIGHT is the default theme; [data-theme="dark"] overrides the tokens.
   Components consume variables only — no hardcoded hex outside :root blocks.
   ========================================================================== */

:root {
  /* Surfaces & text — Light theme (Off-White) */
  --bg-base: #f8fafc;
  --surface-primary: #ffffff;
  --surface-hover: #f1f5f9;
  --surface-raised: #ffffff;
  --surface-input: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  /* Borders — Light theme */
  --border-subtle: #f1f5f9;
  --border-default: #e2e8f0;
  --border-strong: #cbd5e1;

  /* Brand & semantics (consistent across themes) */
  --accent-primary: #6366f1;
  --accent-hover: #4f46e5;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;

  /* RGB triples for 10% opacity badge/chip backgrounds */
  --accent-primary-rgb: 99, 102, 241;
  --success-rgb: 34, 197, 94;
  --danger-rgb: 239, 68, 68;
  --warning-rgb: 245, 158, 11;
  --info-rgb: 59, 130, 246;

  /* On-accent text */
  --text-on-accent: #ffffff;

  /* Spacing — 8pt grid */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --radius-full: 50%;

  /* Typography */
  --font-sans: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Menlo', monospace;
  --fs-headline-lg: 2rem;      /* 32px / 600 / -0.025em */
  --fs-headline-sm: 1.25rem;   /* 20px / 600 / -0.025em */
  --fs-body-lg: 1rem;          /* 16px / 400 */
  --fs-body-md: 0.875rem;      /* 14px / 400 */
  --fs-micro: 0.75rem;         /* 12px / 600 / 0.05em */
  --fs-mono: 13px;
  --ls-tight: -0.025em;
  --ls-wide: 0.05em;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Motion */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 350ms;
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);

  /* Z-index */
  --z-base: 0;
  --z-dropdown: 40;
  --z-sticky: 50;
  --z-modal: 100;

  /* Layout */
  --page-max: 720px;
}

[data-theme="dark"] {
  --bg-base: #121214;
  --surface-primary: #1e1e24;
  --surface-hover: #25252b;
  --surface-raised: #2a2a32;
  --surface-input: rgba(0, 0, 0, 0.2);
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  --border-subtle: rgba(255, 255, 255, 0.03);
  --border-default: rgba(255, 255, 255, 0.05);
  --border-strong: rgba(255, 255, 255, 0.1);

  /* Depth comes from borders and surface steps, not heavy shadows */
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

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

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

body {
  margin: 0;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
  line-height: 1.55;
  transition: background-color var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
}

h1, h2, h3, p, figure {
  margin: 0;
}

:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.app {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-12);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .app {
    padding: var(--space-8) var(--space-6) var(--space-12);
  }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.app-title {
  font-size: var(--fs-headline-lg);
  font-weight: 600;
  letter-spacing: var(--ls-tight);
  line-height: 1.2;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--surface-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
}

.lang-btn {
  min-height: 36px;
  min-width: 44px;
  padding: 0 var(--space-3);
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.lang-btn:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.lang-btn[aria-pressed="true"] {
  background: var(--accent-primary);
  color: var(--text-on-accent);
}

.icon-btn {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: var(--surface-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.icon-btn:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
  display: block;
}

/* Sun shows in dark theme (click to go light); moon shows in light theme. */
.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */

.tabs {
  display: flex;
  flex-direction: row;
  gap: var(--space-4);
  border-bottom: 1px solid var(--border-default);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  flex: 0 0 auto;
  min-height: 44px;
  padding: var(--space-3) var(--space-1) var(--space-2);
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: var(--fs-body-md);
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.tab:hover {
  color: var(--text-primary);
}

.tab[aria-selected="true"] {
  color: var(--text-primary);
  border-bottom-color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.card {
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .card {
    padding: var(--space-6);
  }
}

.card-title {
  font-size: var(--fs-headline-sm);
  font-weight: 600;
  letter-spacing: var(--ls-tight);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.panel[hidden] {
  display: none;
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field-label {
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.helper {
  font-size: var(--fs-body-md);
  color: var(--text-secondary);
}

.rich-input {
  min-height: 220px;
  padding: var(--space-3);
  background: var(--surface-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
  line-height: 1.55;
  overflow-y: auto;
  overflow-wrap: anywhere;
  word-break: break-word;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.rich-input:empty::before,
.rich-input.is-empty::before {
  content: attr(data-placeholder);
  color: var(--text-muted);
  pointer-events: none;
  display: block;
}

.rich-input a {
  color: var(--accent-primary);
}

.rich-input img {
  max-width: 100%;
  height: auto;
}

.rich-input table {
  max-width: 100%;
}

.text-input {
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  background: var(--surface-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
  width: 100%;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.text-input::placeholder {
  color: var(--text-muted);
}

.text-input:disabled,
.rich-input[aria-disabled="true"] {
  background: var(--surface-hover);
  color: var(--text-muted);
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: var(--fs-body-lg);
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--text-on-accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-primary:disabled {
  background: var(--surface-hover);
  color: var(--text-muted);
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--surface-primary);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--surface-hover);
}

.btn-secondary:disabled {
  color: var(--text-muted);
  border-color: var(--border-default);
  cursor: not-allowed;
}

.btn-block {
  width: 100%;
}

@media (min-width: 480px) {
  .btn-auto {
    align-self: flex-start;
  }
}

/* --------------------------------------------------------------------------
   Spinner & pulse
   -------------------------------------------------------------------------- */

.spinner {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: spin 600ms linear infinite;
}

.spinner[hidden] {
  display: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.waiting {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-body-md);
  color: var(--text-secondary);
}

.waiting-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--info);
  animation: pulse var(--duration-slow) var(--ease-out) infinite alternate;
}

@keyframes pulse {
  from { opacity: 1; transform: scale(1); }
  to { opacity: 0.4; transform: scale(0.75); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner,
  .waiting-dot {
    animation: none;
  }
}

/* --------------------------------------------------------------------------
   Chips / badges — semantic color at 10% background, 100% text
   -------------------------------------------------------------------------- */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0;
}

.chip-danger {
  background: rgba(var(--danger-rgb), 0.1);
  color: var(--danger);
}

.chip-warning {
  background: rgba(var(--warning-rgb), 0.1);
  color: var(--warning);
}

.chip-success {
  background: rgba(var(--success-rgb), 0.1);
  color: var(--success);
}

.chip-info {
  background: rgba(var(--info-rgb), 0.1);
  color: var(--info);
}

/* --------------------------------------------------------------------------
   Notes & result cards (toast pattern: 4px semantic left border)
   -------------------------------------------------------------------------- */

.note,
.result-card {
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-left: 4px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.result-card {
  animation: rise var(--duration-normal) var(--ease-out);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(var(--space-2)); }
  to { opacity: 1; transform: none; }
}

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

.is-danger  { border-left-color: var(--danger); }
.is-success { border-left-color: var(--success); }
.is-warning { border-left-color: var(--warning); }
.is-info    { border-left-color: var(--info); }

.result-title {
  font-size: var(--fs-headline-sm);
  font-weight: 600;
  letter-spacing: var(--ls-tight);
}

.is-danger  > .result-title { color: var(--danger); }
.is-success > .result-title { color: var(--success); }
.is-warning > .result-title { color: var(--warning); }
.is-info    > .result-title { color: var(--info); }

.result-body {
  font-size: var(--fs-body-lg);
  color: var(--text-primary);
  overflow-wrap: anywhere;
}

.result-summary {
  font-size: var(--fs-body-md);
  color: var(--text-secondary);
  overflow-wrap: anywhere;
}

.result-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: var(--text-muted);
  overflow-wrap: anywhere;
}

.result-region:empty {
  display: none;
}

.result-region {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* --------------------------------------------------------------------------
   Certainty meter
   -------------------------------------------------------------------------- */

.meter {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.meter-label {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.meter-value {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  text-transform: none;
  color: var(--text-primary);
}

.meter-track {
  display: flex;
  gap: var(--space-1);
}

.meter-seg {
  flex: 1 1 0;
  height: 8px;
  border-radius: var(--radius-sm);
  background: var(--surface-hover);
  border: 1px solid var(--border-default);
}

.meter-danger  .meter-seg.is-on { background: var(--danger);  border-color: var(--danger); }
.meter-success .meter-seg.is-on { background: var(--success); border-color: var(--success); }
.meter-warning .meter-seg.is-on { background: var(--warning); border-color: var(--warning); }

/* --------------------------------------------------------------------------
   Email tab
   -------------------------------------------------------------------------- */

.email-address-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.email-address {
  flex: 1 1 240px;
  padding: var(--space-3);
  background: var(--surface-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--fs-body-lg);
  color: var(--text-primary);
  overflow-wrap: anywhere;
  user-select: all;
}

.countdown {
  font-size: var(--fs-body-md);
  color: var(--text-secondary);
}

.countdown-value {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stack-tight {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.app-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-4);
}

.footer-note {
  font-size: var(--fs-body-md);
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Small screens (360px comfortable)
   -------------------------------------------------------------------------- */

@media (max-width: 400px) {
  .app {
    padding: var(--space-4) var(--space-3) var(--space-8);
    gap: var(--space-4);
  }

  .app-title {
    font-size: var(--fs-headline-sm);
  }

  .email-address {
    font-size: var(--fs-body-md);
  }
}