/* ==========================================================================
   EBANX Design Tokens
   Swap these custom properties to retheme the entire app.
   EB Blue is the primary highlight; white is the dominant background.
   No gradient colors are used anywhere.
   ========================================================================== */

:root {
  /* --- EBANX Brand Colors ------------------------------------------------- */

  --eb-blue:       #0051FF;
  --eb-dark-blue:  #001135;
  --eb-light-blue: #C4DDFF;
  --eb-white:      #FFFFFF;

  /* --- Surfaces ----------------------------------------------------------- */

  --color-bg:          var(--eb-white);
  --color-surface:     var(--eb-white);
  --color-surface-alt: #F0F6FF;    /* very light EB Blue tint — textareas, alt rows  */
  --color-border:      var(--eb-light-blue);
  --color-border-focus:var(--eb-blue);
  --color-overlay:     rgba(196, 221, 255, 0.30); /* EB Light Blue at low opacity     */

  /* --- Text --------------------------------------------------------------- */

  --color-text-primary:   var(--eb-dark-blue);
  --color-text-secondary: #3A527A;   /* lighter navy                                 */
  --color-text-muted:     #6B83A8;   /* desaturated blue-gray                        */
  --color-text-on-dark:   var(--eb-white);

  /* --- Primary action — EB Blue ------------------------------------------- */

  --color-primary:          var(--eb-blue);
  --color-primary-hover:    #0047E0;
  --color-primary-active:   #003CC4;
  --color-primary-disabled: #80A8FF;

  /* --- Secondary action --------------------------------------------------- */

  --color-secondary-bg:     var(--eb-white);
  --color-secondary-hover:  #EEF4FF;              /* very light EB Blue               */
  --color-secondary-text:   var(--eb-dark-blue);
  --color-secondary-border: var(--eb-light-blue);

  /* --- Warning (amber kept for accessibility) ----------------------------- */

  --color-warning-bg:     #FFFBEB;
  --color-warning-border: #FCD34D;
  --color-warning-text:   #7D4E00;
  --color-warning-icon:   #D97706;

  /* --- Success (copy confirmation) --------------------------------------- */

  --color-success:        #059669;
  --color-success-bg:     #F0FDF4;
  --color-success-border: #86EFAC;
  --color-success-text:   #166534;

  /* --- Typography --------------------------------------------------------- */

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
               Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo,
               Courier, monospace;

  --font-size-xs:   0.6875rem;
  --font-size-sm:   0.8125rem;
  --font-size-base: 1rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  1.875rem;

  --font-weight-normal:   400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;

  --line-height-tight: 1.25;
  --line-height-snug:  1.375;
  --line-height-base:  1.5;

  /* --- Spacing (8-pt grid) ------------------------------------------------ */

  --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;

  /* --- Borders & radius --------------------------------------------------- */

  --radius-sm: 0.25rem;
  --radius:    0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --border-width: 1px;

  /* --- Shadows (flat look — no color tint) -------------------------------- */

  --shadow-xs: 0 1px 2px rgba(0, 17, 53, 0.06);
  --shadow-sm: 0 1px 3px rgba(0, 17, 53, 0.10), 0 1px 2px rgba(0, 17, 53, 0.06);
  --shadow:    0 4px 6px rgba(0, 17, 53, 0.07), 0 2px 4px rgba(0, 17, 53, 0.04);

  /* --- Motion ------------------------------------------------------------- */

  --duration-fast: 120ms;
  --duration-base: 200ms;
  --ease-out:      cubic-bezier(0.2, 0, 0, 1);
}

/* ==========================================================================
   Reset / base
   ========================================================================== */

/* [hidden] must beat any display-override rules (e.g. .spinner) */
[hidden],
.is-hidden { display: none !important; }

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

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

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  min-height: 100dvh;
}

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

/* ==========================================================================
   Page layout
   ========================================================================== */

.page {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.container {
  width: 100%;
  max-width: 42rem;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ==========================================================================
   Site header (EBANX logo bar)
   ========================================================================== */

.site-header {
  background: var(--color-surface);
  border-bottom: 2px solid var(--eb-light-blue);
  padding-block: var(--space-4);
}

.site-header .container {
  display: flex;
  align-items: center;
}

.site-logo {
  display: block;
  height: 28px;
  width: auto;
}

/* ==========================================================================
   Page header (title + subtitle)
   ========================================================================== */

.page-header {
  padding-block: var(--space-12) var(--space-10);
  text-align: center;
}

.page-header__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  padding: var(--space-1) var(--space-3);
  background: var(--eb-light-blue);
  border-radius: var(--radius-full);
  color: var(--eb-dark-blue);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.page-header__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  color: var(--eb-dark-blue);
  margin-bottom: var(--space-3);
}

.page-header__subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  max-width: 34rem;
  margin-inline: auto;
}

/* ==========================================================================
   Generate section
   ========================================================================== */

.generate-section {
  text-align: center;
  margin-bottom: var(--space-12);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: var(--border-width) solid transparent;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color     var(--duration-fast) var(--ease-out),
    color            var(--duration-fast) var(--ease-out),
    box-shadow       var(--duration-fast) var(--ease-out),
    transform        var(--duration-fast) var(--ease-out);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

/* Primary — EB Blue, flat (no gradient) */

.btn--primary {
  background-color: var(--color-primary);
  border-color:     var(--color-primary);
  color:            var(--color-text-on-dark);
  box-shadow:       var(--shadow-sm);
  padding-inline:   var(--space-10);
  padding-block:    var(--space-4);
  font-size:        var(--font-size-lg);
  font-weight:      var(--font-weight-semibold);
  border-radius:    var(--radius-lg);
  letter-spacing:   0.01em;
}

.btn--primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color:     var(--color-primary-hover);
  box-shadow:       var(--shadow);
}

.btn--primary:active:not(:disabled) {
  background-color: var(--color-primary-active);
  border-color:     var(--color-primary-active);
}

.btn--primary:disabled {
  background-color: var(--color-primary-disabled);
  border-color:     var(--color-primary-disabled);
  cursor:           not-allowed;
  box-shadow:       none;
}

/* Secondary */

.btn--secondary {
  background-color: var(--color-secondary-bg);
  border-color:     var(--color-secondary-border);
  color:            var(--color-secondary-text);
  box-shadow:       var(--shadow-xs);
  font-size:        var(--font-size-sm);
  padding:          var(--space-2) var(--space-4);
}

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-secondary-hover);
  box-shadow:       var(--shadow-sm);
}

/* Copy-confirmed state */

.btn--success {
  background-color: var(--color-success-bg) !important;
  border-color:     var(--color-success-border) !important;
  color:            var(--color-success-text) !important;
}

/* ==========================================================================
   Spinner
   ========================================================================== */

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

.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: spin 0.65s linear infinite;
  flex-shrink: 0;
}

/* ==========================================================================
   Keys section
   ========================================================================== */

.keys-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding-bottom: var(--space-16);
}

.keys-section[hidden] {
  display: none;
}

/* ==========================================================================
   Key card
   ========================================================================== */

.key-card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.key-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface-alt);
  border-bottom: var(--border-width) solid var(--color-border);
}

.key-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--eb-dark-blue);
}

.key-card__actions {
  display: flex;
  gap: var(--space-2);
}

.key-card__body {
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ==========================================================================
   Warning box
   ========================================================================== */

.warning-box {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-warning-bg);
  border: var(--border-width) solid var(--color-warning-border);
  border-radius: var(--radius);
  color: var(--color-warning-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-snug);
}

.warning-box__icon {
  flex-shrink: 0;
  font-size: var(--font-size-base);
  line-height: 1;
  margin-top: 0.1em;
}

/* ==========================================================================
   Key textarea
   ========================================================================== */

.key-output {
  display: block;
  width: 100%;
  min-height: 9rem;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-alt);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-primary);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  resize: vertical;
  word-break: break-all;
  cursor: text;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.key-output:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(0, 81, 255, 0.15);
}

/* ==========================================================================
   chmod hint (private key card)
   ========================================================================== */

.chmod-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.chmod-hint code {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  background: var(--color-surface-alt);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.15em 0.45em;
  color: var(--eb-dark-blue);
  white-space: nowrap;
}

/* ==========================================================================
   Screen-reader-only utility
   ========================================================================== */

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

/* ==========================================================================
   Footer
   ========================================================================== */

.page-footer {
  margin-top: auto;
  padding-block: var(--space-8);
  border-top: var(--border-width) solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-4);
  }

  .page-header {
    padding-block: var(--space-8) var(--space-6);
  }

  .page-header__title {
    font-size: var(--font-size-2xl);
  }

  .page-header__subtitle {
    font-size: var(--font-size-base);
  }

  .btn--primary {
    width: 100%;
    font-size: var(--font-size-base);
  }

  .key-card__header {
    padding: var(--space-4);
  }

  .key-card__body {
    padding: var(--space-4);
  }

  .key-card__actions {
    width: 100%;
    justify-content: flex-end;
  }
}