/* ==========================================================================
   Components: nav, buttons, cards, footer, forms, glass utilities, misc UI
   ========================================================================== */

/* ---- Glass utility (used sparingly: nav + a couple of accent moments) ---- */
.glass {
  background: var(--glass-card-bg);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border: 1.5px solid var(--border-strong);
  box-shadow: var(--hard-shadow);
}

/* ---- Navbar ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: var(--glass-nav-bg);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1.5px solid var(--border-strong);
  transition: background var(--dur-base) var(--ease-in-out);
}

.nav-container {
  max-width: 1220px;
  margin: 0 auto;
  padding: var(--sp-3) clamp(20px, 4vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.nav-logo .mark {
  width: 38px;
  height: 38px;
  border-radius: var(--r-md);
  background: var(--text-primary);
  border: 1.5px solid var(--border-strong);
  color: var(--bg);
  display: grid;
  place-items: center;
  font-size: var(--fs-sm);
  font-weight: 800;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}

.nav-link {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: var(--sp-1) 0;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--r-pill);
  transition: width var(--dur-base) var(--ease-out);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--bg-raised);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
}

.theme-toggle:hover { transform: translateY(-2px); border-color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; stroke: var(--text-primary); }
.theme-toggle .icon-moon { display: none; }
[data-theme='dark'] .theme-toggle .icon-sun { display: none; }
[data-theme='dark'] .theme-toggle .icon-moon { display: block; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--sp-2);
}

.hamburger .bar {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--r-pill);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base);
}

.hamburger.active .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active .bar:nth-child(2) { opacity: 0; }
.hamburger.active .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-menu {
    position: fixed;
    top: 68px;
    left: var(--sp-4);
    right: var(--sp-4);
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-1);
    background: var(--glass-nav-bg);
    backdrop-filter: blur(24px) saturate(160%);
    border: 1px solid var(--glass-nav-border);
    border-radius: var(--r-lg);
    padding: var(--sp-4);
    box-shadow: var(--glass-shadow);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: all var(--dur-base) var(--ease-out);
  }
  .nav-menu.active { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-link { padding: var(--sp-3) var(--sp-3); border-radius: var(--r-sm); }
  .nav-link:hover { background: var(--bg-alt); }
  .nav-link::after { display: none; }
  .hamburger { display: flex; }
}

/* ---- Buttons: flat fill + hard offset shadow, "presses in" on click ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.85rem 1.6rem;
  border-radius: var(--r-sm);
  font-size: var(--fs-sm);
  font-weight: 700;
  border: 1.5px solid var(--border-strong);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  box-shadow: var(--hard-shadow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--border-strong);
}

.btn-primary:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0 var(--border-strong);
}

.btn-glass {
  background: var(--bg-raised);
  border-color: var(--border-strong);
  color: var(--text-primary);
  box-shadow: var(--hard-shadow-sm);
}

.btn-glass:hover {
  background: var(--bg-alt);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--border-strong);
}

.btn-glass:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--border-strong);
}

.btn-sm { padding: 0.6rem 1.2rem; font-size: var(--fs-xs); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none !important; }

/* ---- Cards: flat paper + hard border + offset shadow, not soft blur ---- */
.card {
  background: var(--bg-raised);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--hard-shadow-sm);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}

.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--border-strong);
}

/* ---- Badges / tags ---- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.85rem;
  border-radius: var(--r-sm);
  font-size: var(--fs-xs);
  font-weight: 700;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}

.tag.stamp {
  background: var(--stamp-soft);
  color: var(--stamp);
  border-color: color-mix(in srgb, var(--stamp) 30%, transparent);
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: var(--sp-10) 0 var(--sp-6);
  background: var(--bg-alt);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--sp-8);
}

.footer-brand p { margin-top: var(--sp-3); max-width: 34ch; }

.footer-col h4 {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: var(--sp-4);
}

.footer-col a {
  display: block;
  padding: var(--sp-1) 0;
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  transition: color var(--dur-fast);
}

.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  margin-top: var(--sp-8);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-3);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
}

.social-row { display: flex; gap: var(--sp-3); }

.social-link {
  width: 38px;
  height: 38px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  transition: all var(--dur-fast) var(--ease-out);
}

.social-link:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  transform: translateY(-2px);
}

.social-link svg { width: 16px; height: 16px; }

@media (max-width: 780px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--sp-6); }
}

/* ---- Forms ---- */
.form-group { margin-bottom: var(--sp-5); }

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

@media (max-width: 560px) {
  .form-row { grid-template-columns: 1fr; }
}

.form-group label {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: var(--sp-2);
}

.form-group label .required-mark { color: var(--stamp); }

.field-shell { position: relative; }

.field-shell .field-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  pointer-events: none;
  transition: color var(--dur-fast);
}

.field-shell .field-status {
  position: absolute;
  right: 1rem;
  top: 1rem;
  width: 18px;
  height: 18px;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.field-shell textarea ~ .field-status { top: 1rem; }

.form-group.is-valid .field-status { opacity: 1; transform: scale(1); color: var(--success); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.9rem 1.1rem;
  border-radius: var(--r-md);
  background: var(--bg-raised);
  border: 1.5px solid var(--border-strong);
  color: var(--text-primary);
  font-size: var(--fs-base);
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast), transform var(--dur-fast);
}

.field-shell input,
.field-shell textarea { padding-left: 2.75rem; }

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--hard-shadow-accent);
  transform: translate(-2px, -2px);
}

.form-group input:focus ~ .field-icon,
.form-group textarea:focus ~ .field-icon { color: var(--accent); }

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-tertiary); }

.form-group .field-error {
  display: none;
  align-items: center;
  gap: var(--sp-1);
  margin-top: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--error);
}

.form-group.has-error input,
.form-group.has-error textarea {
  border-color: var(--error);
  box-shadow: 4px 4px 0 var(--error);
}
.form-group.has-error .field-error { display: flex; }
.form-group.has-error .field-status { display: none; }

.form-note {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-top: var(--sp-4);
}

/* Submit button loading spinner */
.btn .btn-spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid color-mix(in srgb, currentColor 30%, transparent);
  border-top-color: currentColor;
  animation: spin 0.7s linear infinite;
  display: none;
}

.btn.is-loading .btn-spinner { display: inline-block; }
.btn.is-loading .btn-label { opacity: 0.7; }

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

/* Form success swap state */
.form-success {
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--sp-4);
  text-align: left;
}

.form-success.visible { display: flex; }
.form-success .success-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-pill);
  background: var(--success);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  border: 1.5px solid var(--border-strong);
}
.form-success .success-icon svg { width: 24px; height: 24px; }

/* ---- Loading screen ---- */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 3000;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  transition: opacity var(--dur-slow) var(--ease-in-out), visibility var(--dur-slow);
}

.loading-screen.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.loading-mark {
  width: 56px;
  height: 56px;
  border-radius: var(--r-md);
  background: var(--text-primary);
  border: 1.5px solid var(--border-strong);
  display: grid;
  place-items: center;
  color: var(--bg);
  font-family: var(--font-display);
  font-weight: 800;
  animation: pulse-mark 1.4s var(--ease-in-out) infinite;
}

@keyframes pulse-mark {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.loading-bar {
  width: 160px;
  height: 3px;
  border-radius: var(--r-pill);
  background: var(--border);
  overflow: hidden;
}

.loading-bar::after {
  content: '';
  display: block;
  width: 40%;
  height: 100%;
  background: var(--accent);
  animation: loading-sweep 1.1s var(--ease-in-out) infinite;
}

@keyframes loading-sweep {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}

/* ---- Scroll progress ---- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent);
  z-index: var(--z-overlay);
  transition: width 80ms linear;
}

/* ---- Back to top FAB ---- */
.fab-button {
  position: fixed;
  right: var(--sp-5);
  bottom: var(--sp-5);
  width: 48px;
  height: 48px;
  border-radius: var(--r-pill);
  background: var(--accent);
  color: var(--accent-ink);
  border: 1.5px solid var(--border-strong);
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: var(--z-overlay);
  box-shadow: var(--hard-shadow-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--dur-base) var(--ease-out);
}

.fab-button:hover { box-shadow: 6px 6px 0 var(--border-strong); }

.fab-button.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.fab-button svg { width: 18px; height: 18px; }

/* ---- Toasts ---- */
.toast-container {
  position: fixed;
  bottom: var(--sp-5);
  left: var(--sp-5);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.toast {
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-md);
  background: var(--bg-raised);
  border: 1.5px solid var(--border-strong);
  box-shadow: var(--hard-shadow-sm);
  font-size: var(--fs-sm);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  animation: toast-in var(--dur-base) var(--ease-out);
}

.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--error); color: var(--error); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Reveal-on-scroll ---- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}

.reveal-on-scroll.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-bottom: var(--sp-5);
}

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent); }