/* ═══════════════════════════════════════════════════════════
   AintoB.com — Base Stylesheet
   System fonts only · Bootstrap 5.3 layer · GDPR-ready
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Colors */
  --color-bg:            #F9FAFB;
  --color-surface:       #FFFFFF;
  --color-border:        #E5E7EB;
  --color-border-light:  #F3F4F6;
  --color-text:          #111827;
  --color-text-muted:    #6B7280;
  --color-text-light:    #9CA3AF;
  --color-accent:        #2563EB;
  --color-accent-hover:  #1D4ED8;
  --color-accent-light:  #EFF6FF;
  --color-accent-mid:    #DBEAFE;

  /* Typography — system font stack, no external requests */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Helvetica, Arial, sans-serif, "Apple Color Emoji",
               "Segoe UI Emoji";
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Monaco,
               "Cascadia Code", "Liberation Mono", Courier, monospace;

  /* Type scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;

  /* Border radius */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / .07),
               0 2px 4px -2px rgb(0 0 0 / .05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .08),
               0 4px 6px -4px rgb(0 0 0 / .04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .08),
               0 8px 10px -6px rgb(0 0 0 / .04);

  /* Motion */
  --ease-fast:   150ms ease;
  --ease-normal: 220ms ease;
  --ease-slow:   380ms ease;

  /* Layout */
  --max-width:         1200px;
  --content-width:     800px;
  --container-padding: 1rem;
}

@media (min-width: 768px)  { :root { --container-padding: 1.5rem; } }
@media (min-width: 1024px) { :root { --container-padding: 2rem;   } }


/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family:             var(--font-main);
  font-size:               var(--text-base);
  line-height:             1.6;
  color:                   var(--color-text);
  background-color:        var(--color-bg);
  -webkit-font-smoothing:  antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--color-accent); transition: color var(--ease-fast); }
a:hover { color: var(--color-accent-hover); }


/* ── Accessibility ──────────────────────────────────────────── */
.skip-link {
  position:      absolute;
  top:           -100%;
  left:          1rem;
  padding:       .5rem 1rem;
  background:    var(--color-accent);
  color:         #fff;
  font-weight:   600;
  border-radius: var(--radius-sm);
  z-index:       9999;
  transition:    top var(--ease-normal);
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

:focus-visible {
  outline:        2px solid var(--color-accent);
  outline-offset: 3px;
}


/* ── Bootstrap Overrides ────────────────────────────────────── */

/* Buttons */
.btn {
  font-family:    var(--font-main);
  font-weight:    600;
  letter-spacing: -.01em;
  transition:     background-color var(--ease-fast),
                  border-color var(--ease-fast),
                  color var(--ease-fast),
                  box-shadow var(--ease-fast),
                  transform var(--ease-fast);
}
.btn:active { transform: translateY(0) !important; }

.btn-primary {
  background-color: var(--color-accent);
  border-color:     var(--color-accent);
  border-radius:    var(--radius-md);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-accent-hover);
  border-color:     var(--color-accent-hover);
  transform:        translateY(-1px);
  box-shadow:       0 4px 12px rgb(37 99 235 / .28);
}

.btn-outline-secondary {
  border-color:  var(--color-border);
  color:         var(--color-text-muted);
  border-radius: var(--radius-md);
}
.btn-outline-secondary:hover {
  background-color: var(--color-bg);
  border-color:     #D1D5DB;
  color:            var(--color-text);
}

.btn-outline-primary {
  border-color:  var(--color-accent);
  color:         var(--color-accent);
  border-radius: var(--radius-md);
}
.btn-outline-primary:hover {
  background-color: var(--color-accent);
  border-color:     var(--color-accent);
}

/* Forms */
.form-control,
.form-select {
  font-family:   var(--font-main);
  border-color:  var(--color-border);
  border-radius: var(--radius-md);
  transition:    border-color var(--ease-fast), box-shadow var(--ease-fast);
}
.form-control:focus,
.form-select:focus {
  border-color: var(--color-accent);
  box-shadow:   0 0 0 3px rgb(37 99 235 / .12);
}

/* Accordion */
.accordion-item        { border-color: var(--color-border); }
.accordion-button      { font-family: var(--font-main); font-weight: 600; }
.accordion-button:focus { box-shadow: 0 0 0 3px rgb(37 99 235 / .12); }
.accordion-button:not(.collapsed) {
  background-color: var(--color-accent-light);
  color:            var(--color-accent);
  box-shadow:       none;
}

/* Navbar */
.navbar { font-family: var(--font-main); }


/* ── Layout Helpers ─────────────────────────────────────────── */
.divider {
  height:     1px;
  background: var(--color-border);
  border:     none;
  margin:     0;
}

.text-accent  { color: var(--color-accent) !important; }
.text-muted   { color: var(--color-text-muted) !important; }

.surface {
  background:    var(--color-surface);
  border-radius: var(--radius-lg);
  border:        1px solid var(--color-border);
}


/* ── Typography Helpers ─────────────────────────────────────── */
.section-label {
  font-size:      var(--text-xs);
  font-weight:    700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color:          var(--color-text-light);
  margin-bottom:  .5rem;
}

.section-title {
  font-size:      clamp(1.4rem, 3.5vw, 2rem);
  font-weight:    700;
  letter-spacing: -.025em;
  line-height:    1.2;
  color:          var(--color-text);
  margin-bottom:  .5rem;
}

.section-sub {
  color:      var(--color-text-muted);
  font-size:  var(--text-base);
  max-width:  520px;
  margin:     0 auto;
}

.eyebrow {
  display:        inline-flex;
  align-items:    center;
  gap:            .4rem;
  font-size:      var(--text-xs);
  font-weight:    700;
  color:          var(--color-accent);
  background:     var(--color-accent-light);
  padding:        .3rem .8rem;
  border-radius:  var(--radius-full);
  margin-bottom:  1.25rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}


/* ── Navbar ─────────────────────────────────────────────────── */
.navbar-aintob {
  background:    var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding:       .875rem 0;
  /* NOT sticky — standard static flow */
}

.navbar-logo {
  font-size:   1.4rem;
  font-weight: 700;
  color:       var(--color-text);
  text-decoration: none;
  letter-spacing: -.02em;
  transition:  opacity var(--ease-fast);
}
.navbar-logo:hover { opacity: .75; color: var(--color-text); }

.navbar-tools-link {
  display:         inline-flex;
  align-items:     center;
  gap:             .35rem;
  padding:         .4rem .9rem;
  font-size:       var(--text-sm);
  font-weight:     500;
  color:           var(--color-text-muted);
  text-decoration: none;
  border:          1px solid var(--color-border);
  border-radius:   var(--radius-full);
  transition:      all var(--ease-fast);
}
.navbar-tools-link:hover {
  background:   var(--color-bg);
  border-color: #D1D5DB;
  color:        var(--color-text);
}


/* ── Hero ───────────────────────────────────────────────────── */
.section-hero {
  background:      var(--color-surface);
  padding:         72px 0 56px;
  border-bottom:   1px solid var(--color-border-light);
}

.hero-title {
  font-size:      clamp(1.875rem, 5vw, 3rem);
  font-weight:    700;
  line-height:    1.15;
  letter-spacing: -.03em;
  color:          var(--color-text);
  margin-bottom:  .75rem;
}

.hero-subtitle {
  font-size:     var(--text-lg);
  color:         var(--color-text-muted);
  margin-bottom: 2rem;
  max-width:     480px;
}


/* ── Converter Section ──────────────────────────────────────── */
.section-converter { background: var(--color-bg); padding: 64px 0; }

.converter-card {
  background:    var(--color-surface);
  border-radius: var(--radius-xl);
  border:        1px solid var(--color-border);
  box-shadow:    var(--shadow-lg);
  padding:       2rem 2rem 1.75rem;
}

.converter-label {
  font-size:      var(--text-xs);
  font-weight:    700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color:          var(--color-text-light);
  margin-bottom:  .5rem;
}

.converter-arrow {
  display:        flex;
  align-items:    center;
  justify-content: center;
  width:          40px;
  height:         40px;
  background:     var(--color-bg);
  border:         1px solid var(--color-border);
  border-radius:  50%;
  color:          var(--color-text-muted);
  font-size:      1rem;
  cursor:         pointer;
  flex-shrink:    0;
  align-self:     flex-end;
  margin-bottom:  .25rem;
  transition:     all var(--ease-normal);
}
.converter-arrow:hover {
  background:   var(--color-accent-light);
  border-color: var(--color-accent);
  color:        var(--color-accent);
  transform:    rotate(180deg);
}

.output-wrapper { position: relative; }
.copy-btn { position: absolute; top: .5rem; right: .5rem; z-index: 1; }

.type-selector { display: flex; gap: .5rem; flex-wrap: wrap; }
.type-pill {
  padding:       .3rem .85rem;
  border-radius: var(--radius-full);
  border:        1px solid var(--color-border);
  background:    var(--color-surface);
  color:         var(--color-text-muted);
  font-size:     var(--text-sm);
  font-weight:   500;
  cursor:        pointer;
  white-space:   nowrap;
  transition:    all var(--ease-fast);
}
.type-pill:hover,
.type-pill.active {
  background:   var(--color-accent);
  border-color: var(--color-accent);
  color:        #fff;
}

.mode-desc {
  font-size: var(--text-xs);
  color:     var(--color-text-light);
  text-align: center;
  margin:    .75rem 0 0;
}


/* ── Features Section ───────────────────────────────────────── */
.section-features { background: var(--color-surface); padding: 72px 0; }

.feature-card {
  background:    var(--color-bg);
  border-radius: var(--radius-lg);
  border:        1px solid var(--color-border);
  padding:       1.75rem 1.5rem;
  text-align:    center;
  height:        100%;
  transition:    box-shadow var(--ease-normal), transform var(--ease-normal);
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform:  translateY(-2px);
}

.feature-icon {
  width:          52px;
  height:         52px;
  background:     var(--color-accent-light);
  border-radius:  var(--radius-md);
  display:        flex;
  align-items:    center;
  justify-content: center;
  font-size:      1.4rem;
  color:          var(--color-accent);
  margin:         0 auto 1rem;
}
.feature-title {
  font-size:     var(--text-base);
  font-weight:   700;
  color:         var(--color-text);
  margin-bottom: .4rem;
}
.feature-text {
  font-size:   var(--text-sm);
  color:       var(--color-text-muted);
  line-height: 1.55;
  margin:      0;
}


/* ── FAQ Section ────────────────────────────────────────────── */
.section-faq { background: var(--color-bg); padding: 72px 0; }


/* ── Footer ─────────────────────────────────────────────────── */
.footer-main {
  background:  var(--color-surface);
  border-top:  1px solid var(--color-border);
  padding:     2rem 0;
}

.footer-logo {
  font-size:       1.2rem;
  font-weight:     700;
  color:           var(--color-text);
  text-decoration: none;
}
.footer-logo:hover { color: var(--color-text); opacity: .75; }

.footer-copy {
  font-size: var(--text-xs);
  color:     var(--color-text-light);
  margin:    .25rem 0 0;
}

.footer-links {
  display:    flex;
  flex-wrap:  wrap;
  gap:        .35rem 1.25rem;
  list-style: none;
  padding:    0;
  margin:     0;
}
.footer-links a {
  color:           var(--color-text-muted);
  text-decoration: none;
  font-size:       var(--text-xs);
  transition:      color var(--ease-fast);
}
.footer-links a:hover { color: var(--color-text); }

.footer-gdpr-badge {
  display:     inline-flex;
  align-items: center;
  gap:         .3rem;
  font-size:   var(--text-xs);
  color:       var(--color-text-light);
  margin-top:  .35rem;
}


/* ── Cookie Banner ───────────────────────────────────────────── */
#cookie-banner {
  position:   fixed;
  bottom:     0;
  left:       0;
  right:      0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding:    1rem 1.25rem;
  box-shadow: 0 -4px 20px rgb(0 0 0 / .08);
  z-index:    9998;
  display:    none;
}
#cookie-banner.show { display: block; }

.cookie-text {
  font-size: var(--text-sm);
  color:     var(--color-text-muted);
}
.cookie-text a { color: var(--color-accent); }


/* ── Toast ───────────────────────────────────────────────────── */
.toast-container { z-index: 9999; }


/* ── Fade-in Animation ───────────────────────────────────────── */
.fade-in {
  opacity:           0;
  transform:         translateY(16px);
  animation:         fadeUp .5s ease forwards;
  animation-play-state: paused;
}
.fade-in.visible { animation-play-state: running; }
.fade-in:nth-child(2) { animation-delay: .08s; }
.fade-in:nth-child(3) { animation-delay: .16s; }
.fade-in:nth-child(4) { animation-delay: .24s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}


/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 575px) {
  .section-hero        { padding: 48px 0 40px; }
  .section-converter   { padding: 40px 0; }
  .section-features    { padding: 48px 0; }
  .section-faq         { padding: 48px 0; }
  .converter-card      { padding: 1.25rem; }
  .hero-subtitle       { font-size: var(--text-base); }

  /* Stack footer on mobile */
  .footer-main .d-flex { flex-direction: column; gap: .75rem; }
  .footer-links        { justify-content: center; }
  .footer-copy         { text-align: center; }
  .footer-gdpr-badge   { justify-content: center; }

  /* Stack converter fields vertically */
  .converter-fields    { flex-direction: column !important; }
  .converter-arrow     { align-self: center; transform: rotate(90deg); }
  .converter-arrow:hover { transform: rotate(270deg); }
}