/* ==========================================================================
   Components — Cards, Buttons, Nav, Modal
   ========================================================================== */

/* ==========================================================================
   Navigation — Minimal, blends with page
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background-color: var(--color-bg);
  transition:
    background-color var(--transition-theme),
    box-shadow var(--transition-base),
    padding var(--transition-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav.scrolled .nav__container {
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
}

.nav__brand {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav__brand:hover {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav__link {
  font-family: var(--font-body);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 400;
  font-size: var(--text-sm);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link:focus {
  color: var(--color-accent);
}

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-text);
}

.nav__toggle-icon {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background var(--transition-fast);
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition-fast);
}

.nav__toggle-icon::before {
  top: -7px;
}

.nav__toggle-icon::after {
  top: 7px;
}

/* Mobile menu open state */
.nav__toggle[aria-expanded='true'] .nav__toggle-icon {
  background: transparent;
}

.nav__toggle[aria-expanded='true'] .nav__toggle-icon::before {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded='true'] .nav__toggle-icon::after {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile navigation */
@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--container-padding);
    display: none;
    flex-direction: column;
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
  }

  .nav__menu.open {
    display: flex;
  }

  .nav__links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-sm);
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-text-inverse);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--icon {
  padding: var(--space-sm);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn--icon:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Social buttons */
.btn--social {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

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

.btn--social svg {
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   Cards — Minimal, editorial
   ========================================================================== */

.card {
  background-color: var(--color-surface);
  border: 1px solid transparent;
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm) var(--radius-lg) var(--radius-lg) var(--radius-sm);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow var(--transition-base),
    background-color var(--transition-theme),
    border-color var(--transition-theme);
}

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

.card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.card__logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.85;
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  margin: 0;
  line-height: 1.3;
}

/* Card title links — clean, no underline by default */
.card__title a {
  color: var(--color-text);
  text-decoration: none;
}

.card__title a:hover {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.card__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-light);
  margin-top: var(--space-xs);
  font-weight: 400;
  letter-spacing: 0.01em;
}

.card__content {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.card__content ul {
  margin-top: var(--space-sm);
  padding-left: var(--space-lg);
}

.card__content li {
  list-style: disc;
  margin-bottom: var(--space-xs);
}

.card__content a {
  color: var(--color-accent-dark);
}

/* ==========================================================================
   Modal — Refined
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 0.4);
  backdrop-filter: blur(6px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.96);
  z-index: var(--z-modal);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 440px;
  width: calc(100% - var(--space-xl) * 2);
  max-height: calc(100vh - var(--space-xl) * 2);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  box-shadow: var(--shadow-xl);
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base),
    transform var(--transition-base);
}

.modal.open {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.modal__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.modal__close {
  background: none;
  border: none;
  font-size: var(--text-xl);
  cursor: pointer;
  color: var(--color-text-light);
  padding: var(--space-xs);
  line-height: 1;
  transition: color var(--transition-fast);
}

.modal__close:hover {
  color: var(--color-text);
}

.modal__section {
  margin-bottom: var(--space-lg);
}

.modal__section:last-child {
  margin-bottom: 0;
}

.modal__section-title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.shortcut-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.shortcut-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
}

.shortcut-keys {
  display: flex;
  gap: var(--space-xs);
  align-items: center;
}

.kbd {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 0 var(--color-border);
  line-height: 1.6;
}

.modal__hint {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-text-light);
  font-style: italic;
  text-align: center;
  margin-top: var(--space-md);
}

/* ==========================================================================
   Floating Dark Mode Toggle (FAB)
   ========================================================================== */

.dark-mode-fab {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-fixed);
  width: 44px;
  height: 44px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.dark-mode-fab:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.dark-mode-fab:active {
  transform: scale(0.95);
}

.dark-mode-fab svg {
  width: 20px;
  height: 20px;
}

/* Dark mode icon visibility */
.icon-sun {
  display: none;
}

.icon-moon {
  display: block;
}

[data-mode='dark'] .icon-sun,
[data-theme='midnight']:not([data-mode='light']) .icon-sun {
  display: block;
}

[data-mode='dark'] .icon-moon,
[data-theme='midnight']:not([data-mode='light']) .icon-moon {
  display: none;
}