/* Components CSS - Buttons, Cards, Modals, Navigation */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-sm) var(--sp-lg);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 1px solid var(--c-primary);
  background-color: transparent;
  color: var(--c-primary);
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  min-width: 120px;
  text-decoration: none;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background-color: var(--c-primary);
  transform: translate(-50%, -50%);
  transition: all 0.4s ease;
  border-radius: 50%;
  opacity: 0.2;
}

.btn:hover {
  color: var(--bg-0);
  background-color: var(--c-primary);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

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

.btn--large {
  padding: var(--sp-md) var(--sp-xl);
  font-size: 1rem;
  min-width: 160px;
}

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

.btn--accent:hover {
  background-color: var(--c-accent);
  box-shadow: var(--glow-accent);
}

.btn--accent::before {
  background-color: var(--c-accent);
}

.btn--filled {
  background-color: var(--c-primary);
  color: var(--bg-0);
}

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

.btn--disabled,
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-group {
  display: flex;
  gap: var(--sp-md);
  flex-wrap: wrap;
}

/* Cards */
.card {
  background-color: var(--bg-2);
  border: 1px solid var(--brd);
  border-radius: 4px;
  padding: var(--sp-lg);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--c-primary), var(--c-accent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.15);
  border-color: var(--c-primary);
}

.card:hover::before {
  opacity: 1;
}

.card__header {
  margin-bottom: var(--sp-md);
  padding-bottom: var(--sp-md);
  border-bottom: 1px solid var(--brd);
}

.card__title {
  font-size: 1.25rem;
  font-family: var(--font-display);
  color: var(--c-primary);
  margin-bottom: var(--sp-sm);
}

.card__subtitle {
  color: var(--tx-dim);
  font-size: 0.875rem;
}

.card__body {
  color: var(--tx-1);
  line-height: 1.6;
}

.card__footer {
  margin-top: var(--sp-lg);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--brd);
}

.card--glass {
  background-color: var(--bg-glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.card--highlight {
  border-color: var(--c-primary);
  box-shadow: inset 0 0 20px rgba(0, 229, 255, 0.1);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-md) var(--sp-md);
}

.nav__brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-primary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

/* Responsive font size for brand */
@media (max-width: 768px) {
  .nav__brand {
    font-size: 1.2rem;
    letter-spacing: 0.05em;
  }
}

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

.nav__item {
  position: relative;
}

.nav__link {
  font-family: var(--font-display);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tx-1);
  padding: var(--sp-sm) 0;
  position: relative;
  transition: color 0.3s ease;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(to right, var(--c-primary), var(--c-accent));
  transition: width 0.3s ease;
}

.nav__link:hover,
.nav__link--active {
  color: var(--c-primary);
}

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

.nav__toggle {
  display: none;
  width: 32px;
  height: 28px;
  position: relative;
  cursor: pointer;
  background: transparent;
  border: none;
  padding: 4px;
  flex-shrink: 0;
  z-index: 10003;
}

.nav__toggle span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--c-primary);
  transition: all 0.3s ease;
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.3);
}

.nav__toggle span:nth-child(1) {
  top: 0;
}

.nav__toggle span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

.nav__toggle span:nth-child(3) {
  bottom: 0;
}

/* Hamburger animation when active */
.nav__toggle--active span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav__toggle--active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle--active span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* Mobile menu overlay */
.nav__overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.7);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 10001;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.nav__overlay--visible {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 768px) {
  .nav {
    padding: var(--sp-md) var(--sp-lg);
  }
  
  .nav__toggle {
    display: block;
  }
  
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    max-width: 85vw;
    height: 100vh;
    background-color: var(--bg-1);
    flex-direction: column;
    justify-content: center;
    padding: var(--sp-2xl) var(--sp-xl);
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 1px solid var(--c-primary);
    box-shadow: -4px 0 20px rgba(0, 229, 255, 0.2);
    overflow-y: auto;
    z-index: 10002;
  }
  
  .nav__menu--open {
    right: 0;
  }
  
  .nav__item {
    width: 100%;
    text-align: center;
    margin: var(--sp-md) 0;
  }
  
  .nav__link {
    display: block;
    font-size: 1rem;
    padding: var(--sp-md);
  }
}

@media (min-width: 769px) {
  .nav__overlay {
    display: none;
  }
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
}

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

/* Demo Selection Modal */
.demo-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

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

.demo-modal__content {
  background: linear-gradient(135deg, rgba(11, 15, 20, 0.98), rgba(20, 25, 35, 0.98));
  border-radius: 12px;
  padding: var(--sp-2xl) var(--sp-xl);
  max-width: 500px;
  width: 90%;
  animation: modal-slide-in 0.4s ease-out;
  position: relative;
  overflow: hidden;
  border: 3px solid transparent;
}

/* 旋轉的霓虹燈外框容器 */
.demo-modal__content::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 150%;
  height: 150%;
  transform: translate(-50%, -50%);
  background: conic-gradient(
    from 0deg,
    rgba(0, 229, 255, 0) 0%,
    rgba(0, 229, 255, 0.8) 10%,
    rgba(0, 229, 255, 1) 15%,
    rgba(0, 229, 255, 0.8) 20%,
    rgba(0, 229, 255, 0) 30%,
    rgba(0, 229, 255, 0) 50%,
    rgba(255, 45, 149, 0) 50%,
    rgba(255, 45, 149, 0.8) 60%,
    rgba(255, 45, 149, 1) 65%,
    rgba(255, 45, 149, 0.8) 70%,
    rgba(255, 45, 149, 0) 80%,
    rgba(0, 229, 255, 0) 100%
  );
  animation: border-spin 4s linear infinite;
  z-index: 0;
  filter: blur(2px) drop-shadow(0 0 10px rgba(0, 229, 255, 0.6)) drop-shadow(0 0 20px rgba(255, 45, 149, 0.6));
}

/* 內部遮罩，只露出邊框 */
.demo-modal__content::after {
  content: '';
  position: absolute;
  inset: 3px;
  background: linear-gradient(135deg, rgba(11, 15, 20, 0.98), rgba(20, 25, 35, 0.98));
  border-radius: 9px;
  z-index: 1;
}

@keyframes border-spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes modal-slide-in {
  from {
    transform: translateY(-30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.demo-modal__header {
  text-align: center;
  margin-bottom: var(--sp-xl);
  position: relative;
  z-index: 2;
}

.demo-modal__title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  color: var(--c-primary);
  margin-bottom: var(--sp-sm);
  text-shadow: 
    0 0 10px rgba(0, 229, 255, 0.8),
    0 0 20px rgba(0, 229, 255, 0.6),
    0 0 30px rgba(0, 229, 255, 0.4),
    0 0 40px rgba(0, 229, 255, 0.2);
}

.demo-modal__subtitle {
  font-size: 0.95rem;
  color: var(--tx-1);
  opacity: 0.8;
}

.demo-modal__options {
  display: flex;
  flex-direction: column;
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
  position: relative;
  z-index: 2;
}

.demo-option {
  display: flex;
  align-items: center;
  padding: var(--sp-lg);
  background: rgba(0, 229, 255, 0.05);
  border: 2px solid rgba(0, 229, 255, 0.3);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  box-shadow: 
    0 0 10px rgba(0, 229, 255, 0.15),
    inset 0 0 10px rgba(0, 229, 255, 0.05);
}

.demo-option:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--c-primary);
  box-shadow: 
    0 0 15px rgba(0, 229, 255, 0.4),
    0 0 30px rgba(0, 229, 255, 0.3),
    0 0 45px rgba(0, 229, 255, 0.2),
    inset 0 0 10px rgba(0, 229, 255, 0.1);
  transform: translateX(5px);
  filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.5));
}

.demo-option__icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 229, 255, 0.1);
  border-radius: 8px;
  margin-right: var(--sp-md);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.demo-option__content {
  flex: 1;
}

.demo-option__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--c-primary);
  margin-bottom: var(--sp-xs);
}

.demo-option__desc {
  font-size: 0.85rem;
  color: var(--tx-1);
  opacity: 0.7;
}

.demo-option--backend {
  background: rgba(255, 45, 149, 0.05);
  border-color: rgba(255, 45, 149, 0.3);
  box-shadow: 
    0 0 10px rgba(255, 45, 149, 0.15),
    inset 0 0 10px rgba(255, 45, 149, 0.05);
}

.demo-option--backend:hover {
  background: rgba(255, 45, 149, 0.1);
  border-color: var(--c-accent);
  box-shadow: 
    0 0 15px rgba(255, 45, 149, 0.4),
    0 0 30px rgba(255, 45, 149, 0.3),
    0 0 45px rgba(255, 45, 149, 0.2),
    inset 0 0 10px rgba(255, 45, 149, 0.1);
  filter: drop-shadow(0 0 8px rgba(255, 45, 149, 0.5));
}

.demo-option--backend .demo-option__icon {
  background: rgba(255, 45, 149, 0.1);
}

.demo-option--backend .demo-option__title {
  color: var(--c-accent);
}

.demo-modal__close {
  width: 100%;
  padding: var(--sp-md);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  color: var(--tx-1);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  z-index: 2;
}

.demo-modal__close:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.05);
}

@media (max-width: 768px) {
  .demo-modal__content {
    padding: var(--sp-xl) var(--sp-md);
  }
  
  .demo-modal__title {
    font-size: 1.5rem;
  }
  
  .demo-option {
    padding: var(--sp-md);
  }
  
  .demo-option__icon {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}

.modal__content {
  background-color: var(--bg-2);
  border: 1px solid var(--c-primary);
  border-radius: 4px;
  max-width: 90%;
  max-height: 90%;
  width: 800px;
  padding: var(--sp-xl);
  position: relative;
  transform: scale(0.9);
  transition: transform 0.3s ease;
  overflow: auto;
}

.modal--open .modal__content {
  transform: scale(1);
}

.modal__close {
  position: absolute;
  top: var(--sp-md);
  right: var(--sp-md);
  width: 32px;
  height: 32px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  border: 1px solid var(--tx-dim);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.modal__close:hover {
  border-color: var(--c-accent);
  background-color: var(--c-accent);
  transform: rotate(90deg);
}

.modal__close::before,
.modal__close::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 2px;
  background-color: var(--tx-1);
  transition: background-color 0.3s ease;
}

.modal__close::before {
  transform: rotate(45deg);
}

.modal__close::after {
  transform: rotate(-45deg);
}

.modal__close:hover::before,
.modal__close:hover::after {
  background-color: var(--bg-0);
}

/* Badge */
.badge {
  display: inline-block;
  padding: var(--sp-xs) var(--sp-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 2px;
  background-color: var(--c-primary);
  color: var(--bg-0);
}

.badge--accent {
  background-color: var(--c-accent);
}

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

.badge--warning {
  background-color: var(--c-warning);
}

.badge--danger {
  background-color: var(--c-danger);
}

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--brd);
  border-top-color: var(--c-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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