/* ========================================
   Components — BIS Consult
   ======================================== */

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-primary);
  border-color: var(--c-accent);
}
.btn-primary:hover {
  background: var(--c-accent-hover);
  border-color: var(--c-accent-hover);
  color: var(--c-white);
  box-shadow: 0 0 20px var(--c-accent-glow-strong);
}

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

.btn-sm {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-xs);
}

.btn-lg {
  padding: var(--sp-4) var(--sp-8);
  font-size: var(--fs-base);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn:disabled,
.btn.is-loading {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn.is-loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ---- Header / Navbar ---- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.header.is-scrolled {
  border-bottom-color: var(--c-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--c-white);
  font-weight: var(--fw-bold);
  font-size: var(--fs-md);
  text-decoration: none;
  flex-shrink: 0;
}
.header__logo:hover {
  color: var(--c-white);
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  border-radius: var(--radius);
}

.logo-text {
  display: none;
}

@media (min-width: 480px) {
  .logo-text {
    display: inline;
  }
}

/* Navigation */
.header__nav {
  display: none;
}

.nav-list {
  display: flex;
  gap: var(--sp-1);
}

.nav-link {
  padding: var(--sp-2) var(--sp-3);
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.05);
}

@media (min-width: 1024px) {
  .header__nav {
    display: block;
  }
}

/* Header actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.header__cta {
  display: none;
}

@media (min-width: 768px) {
  .header__cta {
    display: inline-flex;
  }
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.lang-btn {
  padding: var(--sp-1) var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--c-text-muted);
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.lang-btn:hover {
  color: var(--c-white);
}

.lang-btn.active {
  color: var(--c-accent);
  background: var(--c-accent-glow);
}

.lang-divider {
  color: var(--c-border);
  font-size: var(--fs-xs);
  user-select: none;
}

/* Burger */
.burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.burger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

@media (min-width: 1024px) {
  .burger {
    display: none;
  }
}

/* Mobile overlay */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.mobile-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* Mobile nav panel */
.header__nav.is-open {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: var(--nav-height);
  right: 0;
  bottom: 0;
  width: min(300px, 80vw);
  background: var(--c-primary-light);
  border-left: 1px solid var(--c-border);
  padding: var(--sp-6);
  z-index: 1001;
  animation: slideIn 0.3s var(--ease-out);
}

.header__nav.is-open .nav-list {
  flex-direction: column;
  gap: var(--sp-2);
}

.header__nav.is-open .nav-link {
  font-size: var(--fs-base);
  padding: var(--sp-3) var(--sp-4);
}

@keyframes slideIn {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* ---- Cards ---- */
.pain-card,
.service-card,
.package-card,
.stat-card {
  background: var(--c-primary-light);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

/* ---- Form inputs ---- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.form-group label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-muted);
}

.form-group input,
.form-group textarea {
  padding: var(--sp-3) var(--sp-4);
  background: var(--c-primary);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  color: var(--c-text);
  font-size: var(--fs-base);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--c-text-muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-glow);
}

.form-group input.is-invalid,
.form-group textarea.is-invalid {
  border-color: var(--c-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-group .field-error {
  font-size: var(--fs-xs);
  color: var(--c-error);
  min-height: 1em;
}

.form-note {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  text-align: center;
  margin-top: var(--sp-3);
}

.form-note a {
  color: var(--c-text-muted);
  text-decoration: underline;
}

/* ---- Notifications ---- */
.notifications {
  position: fixed;
  top: calc(var(--nav-height) + var(--sp-4));
  right: var(--sp-4);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  max-width: 380px;
  width: 100%;
}

.notification {
  padding: var(--sp-4);
  border-radius: var(--radius);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-white);
  animation: notifIn 0.3s var(--ease-out);
  cursor: pointer;
}

.notification--success {
  background: var(--c-success);
}

.notification--error {
  background: var(--c-error);
}

@keyframes notifIn {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}