/* =========================================================
   STYLE.CSS
   Core layout, component and typography rules.
   ========================================================= */

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-family);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
}

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

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

a { color: inherit; text-decoration: none; }

ul { list-style: none; margin: 0; padding: 0; }

/* Subtle, deliberate background texture: a faint radial wash
   behind the card rather than a flat fill. This is the one
   ambient touch on the page — everything else stays quiet. */
body {
  background-image:
    radial-gradient(760px 420px at 50% -8%, rgba(79, 70, 229, 0.06), transparent 60%),
    radial-gradient(600px 360px at 100% 100%, rgba(124, 58, 237, 0.04), transparent 55%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}

/* =========================================================
   HEADER
   ========================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(247, 248, 250, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--duration-base) var(--ease-out);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  max-width: var(--page-max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* ---------- Brand mark ---------- */

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--fw-bold);
  font-size: var(--fs-md);
  letter-spacing: var(--ls-tight);
  color: var(--color-text);
}

.brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-weight: var(--fw-extrabold);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--color-primary);
}

.brand__mark-bracket {
  display: inline-block;
  transition: transform var(--duration-base) var(--ease-spring);
}

.brand__mark-dot {
  width: 5px;
  height: 5px;
  margin: 0 2px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: inline-block;
}

.brand:hover .brand__mark-bracket--left { transform: translateX(-2px); }
.brand:hover .brand__mark-bracket--right { transform: translateX(2px); }

.brand__name em {
  font-style: normal;
  color: var(--color-primary);
}

/* ---------- Nav ---------- */

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.site-nav__link {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-out);
}

.site-nav__link:hover { color: var(--color-text); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link.is-active {
  color: var(--color-text);
}
.site-nav__link.is-active::after { transform: scaleX(1); }

/* ---------- Mobile menu toggle ---------- */

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.menu-toggle__bar {
  width: 20px;
  height: 2px;
  margin: 0 auto;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--duration-base) var(--ease-in-out), opacity var(--duration-fast) var(--ease-out);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  max-height: 0;
  overflow: hidden;
  background: var(--color-card);
  border-bottom: 1px solid transparent;
  transition: max-height var(--duration-slow) var(--ease-in-out), border-color var(--duration-base);
}

.mobile-nav.is-open {
  max-height: 300px;
  border-bottom-color: var(--color-border);
}

.mobile-nav__list {
  padding: var(--space-2) var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
}

.mobile-nav__link {
  padding: var(--space-3) 0;
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav__link:last-child { border-bottom: none; }
.mobile-nav__link.is-active,
.mobile-nav__link:hover { color: var(--color-primary); }

/* =========================================================
   MAIN APP LAYOUT
   ========================================================= */

.app {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: var(--space-16) var(--space-5) var(--space-20);
}

.app__container {
  width: 100%;
  max-width: var(--card-max-width);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ---------- Generator card ---------- */

.generator {
  width: 100%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: var(--space-10) var(--space-8) var(--space-8);
  transition: box-shadow var(--duration-slow) var(--ease-out);
}

.generator:hover {
  box-shadow: var(--shadow-card-hover);
}

.generator__header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.generator__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(79, 70, 229, 0.08);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.generator__eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

.generator__title {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-tighter);
  line-height: var(--lh-tight);
  margin: 0 0 var(--space-2);
  color: var(--color-text);
}

.generator__subtitle {
  font-size: var(--fs-base);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: var(--lh-normal);
}

/* ---------- Segmented type switcher ---------- */

.type-switcher {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-6);
}

.type-switcher__btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: var(--space-2) var(--space-1);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out);
  z-index: 1;
}

.type-switcher__btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
}

.type-switcher__btn.is-active {
  color: var(--color-primary);
}

.type-switcher__btn:not(.is-active):hover {
  color: var(--color-text);
}

.type-switcher__thumb {
  position: absolute;
  top: var(--space-1);
  bottom: var(--space-1);
  left: 0;
  width: 0;
  background: var(--color-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: left var(--duration-base) var(--ease-spring),
              width var(--duration-base) var(--ease-spring);
  z-index: 0;
  will-change: left, width;
}

/* ---------- Fields ---------- */

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

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

.field__label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.field__control-wrap {
  position: relative;
}

.field__input,
.field__textarea,
.field__select {
  width: 100%;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-size: var(--fs-base);
  color: var(--color-text);
  transition: border-color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.field__input::placeholder,
.field__textarea::placeholder {
  color: var(--color-text-faint);
}

.field__textarea {
  resize: vertical;
  min-height: 96px;
  line-height: var(--lh-normal);
}

.field__input:hover,
.field__textarea:hover,
.field__select:hover {
  border-color: #D1D5DB;
}

.field__input:focus,
.field__textarea:focus,
.field__select:focus {
  outline: none;
  background: var(--color-card);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.field__input.has-error,
.field__textarea.has-error {
  border-color: var(--color-danger);
}
.field__input.has-error:focus,
.field__textarea.has-error:focus {
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12);
}

.field__hint {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
}

.field__error {
  display: none;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-danger);
}

.field__error.is-visible {
  display: flex;
}

/* Password visibility toggle (Wi-Fi field) */
.field__toggle-visibility {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  padding: var(--space-1);
  color: var(--color-text-faint);
  cursor: pointer;
  display: flex;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out);
}
.field__toggle-visibility:hover { color: var(--color-text-secondary); }
.field__toggle-visibility svg { width: 18px; height: 18px; stroke: currentColor; }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

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

.actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: none;
  border-radius: var(--radius-md);
  padding: 0.85rem 1.5rem;
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-base) var(--ease-out),
              background var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}

.btn svg { width: 18px; height: 18px; stroke: currentColor; flex-shrink: 0; }

.btn:active { transform: scale(0.97); }

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none !important;
  box-shadow: none !important;
}

.btn--primary {
  flex: 1.4;
  background: var(--gradient-brand);
  color: var(--color-text-on-brand);
  box-shadow: var(--shadow-btn);
}
.btn--primary:not(:disabled):hover {
  box-shadow: var(--shadow-btn-hover);
  transform: translateY(-1px);
}

.btn--secondary {
  flex: 1;
  background: var(--color-text);
  color: #FFFFFF;
}
.btn--secondary:not(:disabled):hover {
  background: #262f3f;
  transform: translateY(-1px);
}

.btn--outline {
  flex: 0 0 auto;
  width: 3rem;
  padding: 0.85rem;
  background: var(--color-card);
  border: 1.5px solid var(--color-border);
  color: var(--color-text-secondary);
}
.btn--outline:not(:disabled):hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
  background: var(--color-danger-bg);
}

/* Ripple element injected by JS on click */
.btn__ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: rgba(255, 255, 255, 0.45);
  pointer-events: none;
  animation: ripple 620ms var(--ease-out);
}
.btn--outline .btn__ripple { background: rgba(79, 70, 229, 0.14); }

/* ---------- QR Preview ---------- */

.preview {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.preview__frame {
  position: relative;
  width: 220px;
  height: 220px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.preview__frame canvas,
.preview__frame img {
  width: 184px;
  height: 184px;
  image-rendering: pixelated;
}

.preview__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-faint);
}

.preview__placeholder svg {
  width: 40px;
  height: 40px;
  stroke: var(--color-border);
}

.preview__placeholder span {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
}

/* Corner viewfinder ticks — a quiet nod to the QR/scan motif */
.preview__corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border-color: var(--color-primary);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
}
.preview__frame.has-result .preview__corner { opacity: 1; }
.preview__corner--tl { top: 10px; left: 10px; border-top: 2.5px solid; border-left: 2.5px solid; border-radius: 4px 0 0 0; }
.preview__corner--tr { top: 10px; right: 10px; border-top: 2.5px solid; border-right: 2.5px solid; border-radius: 0 4px 0 0; }
.preview__corner--bl { bottom: 10px; left: 10px; border-bottom: 2.5px solid; border-left: 2.5px solid; border-radius: 0 0 0 4px; }
.preview__corner--br { bottom: 10px; right: 10px; border-bottom: 2.5px solid; border-right: 2.5px solid; border-radius: 0 0 4px 0; }

.preview__scanline {
  position: absolute;
  left: 8%;
  width: 84%;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0;
  pointer-events: none;
}

.preview__info {
  margin-top: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.preview__meta {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  text-align: center;
  max-width: 260px;
  overflow-wrap: anywhere;
  margin: 0;
}

.preview__meta strong {
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
}

.preview__copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: none;
  padding: 2px 4px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--color-primary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out);
}
.preview__copy-btn svg { width: 13px; height: 13px; stroke: currentColor; }
.preview__copy-btn:hover { color: var(--color-primary-hover); text-decoration: underline; }

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

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
}

.site-footer__inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2) var(--space-6);
  text-align: center;
}

.site-footer__made,
.site-footer__copy {
  font-size: var(--fs-xs);
  color: var(--color-text-faint);
  margin: 0;
}

.site-footer__brand {
  color: var(--color-text-secondary);
  font-weight: var(--fw-semibold);
}

.site-footer__heart {
  color: var(--color-danger);
  display: inline-block;
}

.site-footer__email {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-primary);
  transition: color var(--duration-fast) var(--ease-out);
}
.site-footer__email:hover { color: var(--color-primary-hover); text-decoration: underline; }

/* ---------- Toast ---------- */

.toast-stack {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-2);
  z-index: 1000;
  width: min(360px, calc(100vw - var(--space-8)));
  align-items: center;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  background: var(--color-text);
  color: #FFFFFF;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-toast);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
}

.toast__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.toast__icon svg { width: 12px; height: 12px; stroke: #FFFFFF; }

.toast--success .toast__icon { background: var(--color-success); }
.toast--error .toast__icon { background: var(--color-danger); }
.toast--info .toast__icon { background: var(--color-primary); }