/* ========================================
   公共组件样式 - 导航栏、按钮、卡片、弹窗等
   ======================================== */

/* ---- 导航栏 ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-red);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  z-index: 1000;
  box-shadow: 0 2px 12px rgba(139, 26, 26, 0.3);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.nav--scrolled {
  background: var(--color-red-dark);
  box-shadow: 0 4px 20px rgba(139, 26, 26, 0.5);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-gold);
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: text-shadow var(--transition-normal);
}

.nav__logo:hover {
  text-shadow: var(--shadow-gold);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav__link {
  color: var(--color-gold-light);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--color-gold);
  transition: transform var(--transition-normal);
}

.nav__link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.nav__link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.nav__link--active {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.15);
}

.nav__link--active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__hamburger-line {
  width: 24px;
  height: 2px;
  background: var(--color-gold);
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav__hamburger--open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav {
    padding: 0 var(--space-md);
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-red-dark);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-sm);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .nav__menu--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    width: 100%;
    text-align: center;
    padding: var(--space-md);
    font-size: 1rem;
  }
}

/* ---- 按钮 ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-red);
  border: 2px solid var(--color-gold);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(201, 168, 76, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn-primary:hover {
  background: var(--color-red-dark);
  box-shadow: var(--shadow-gold);
  transform: translateY(-2px);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-primary:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-red);
  background: var(--color-cream);
  border: 2px solid var(--color-red);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  background: var(--color-red);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:focus-visible {
  outline: 2px solid var(--color-red);
  outline-offset: 2px;
}

.btn-gold {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 2px 8px rgba(201, 168, 76, 0.3);
}

.btn-gold:hover {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
  box-shadow: var(--shadow-gold);
  transform: translateY(-2px);
}

.btn-gold:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-gold:focus-visible {
  outline: 2px solid var(--color-gold-dark);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .btn-primary,
  .btn-secondary,
  .btn-gold {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
}

/* ---- 卡片 ---- */
.card {
  background: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-red), var(--color-gold), var(--color-red));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

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

.card__image {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  object-fit: cover;
}

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

.card__desc {
  font-size: 0.9rem;
  color: var(--color-gray-dark);
  line-height: 1.6;
}

.card__tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 0.75rem;
  color: var(--color-red);
  background: rgba(196, 26, 26, 0.08);
  border-radius: var(--radius-sm);
  margin-top: var(--space-sm);
}

@media (max-width: 768px) {
  .card {
    padding: var(--space-lg);
  }
}

/* ---- 弹窗 ---- */
.modal__overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(44, 44, 44, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  backdrop-filter: blur(4px);
}

.modal__overlay--visible {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  max-width: 520px;
  width: 90%;
  position: relative;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
  border: 2px solid var(--color-gold);
  box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.modal__overlay--visible .modal {
  transform: scale(1) translateY(0);
}

.modal::before,
.modal::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: var(--color-red);
  border-style: solid;
}

.modal::before {
  top: 8px;
  left: 8px;
  border-width: 3px 0 0 3px;
  border-radius: 2px 0 0 0;
}

.modal::after {
  bottom: 8px;
  right: 8px;
  border-width: 0 3px 3px 0;
  border-radius: 0 0 2px 0;
}

.modal__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-gray-dark);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.modal__close:hover {
  background: var(--color-gray);
  color: var(--color-red);
}

.modal__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}

.modal__body {
  color: var(--color-ink);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
}

.modal__error {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: rgba(196, 26, 26, 0.06);
  border: 1px solid var(--color-red);
  border-radius: var(--radius-md);
  color: var(--color-red);
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
  position: relative;
}

.modal__error::before {
  content: '印';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 2px solid var(--color-red);
  border-radius: 4px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--color-red);
  flex-shrink: 0;
  transform: rotate(-5deg);
}

@media (max-width: 768px) {
  .modal {
    padding: var(--space-xl);
    width: 95%;
  }

  .modal__footer {
    flex-direction: column;
  }
}

/* ---- Toast 提示 ---- */
.toast {
  position: fixed;
  top: calc(var(--nav-height) + var(--space-md));
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-paper);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--color-gold);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-ink);
  z-index: 2500;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
}

.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.toast--success {
  border-left-color: #4CAF50;
}

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

.toast--warning {
  border-left-color: var(--color-gold);
}

@media (max-width: 768px) {
  .toast {
    width: 90%;
    font-size: 0.85rem;
  }
}

/* ---- 章节标题 ---- */
.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
  position: relative;
}

.section-title__heading {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-ink);
  margin-bottom: var(--space-md);
  letter-spacing: 0.15em;
}

.section-title__divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.section-title__line {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.section-title__diamond {
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg);
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .section-title__heading {
    font-size: 1.5rem;
  }
}

/* ---- 烫金分割线 ---- */
.gold-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-gold-light) 15%,
    var(--color-gold) 50%,
    var(--color-gold-light) 85%,
    transparent 100%
  );
  border: none;
  margin: var(--space-xl) 0;
  position: relative;
}

/* ---- 纸张纹理背景 ---- */
.paper-texture {
  background-color: var(--color-paper);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(201, 168, 76, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(196, 26, 26, 0.02) 0%, transparent 50%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(44, 44, 44, 0.01) 2px,
      rgba(44, 44, 44, 0.01) 4px
    );
  position: relative;
}

.paper-texture::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0v60M0 30h60' stroke='%23C9A84C' stroke-opacity='0.03' stroke-width='0.5'/%3E%3C/svg%3E");
  pointer-events: none;
}

/* ---- App Toast 样式 ---- */
.app-toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  color: #F5F0E8;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  font-size: 14px;
  font-family: "Noto Serif SC", serif;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
  max-width: 90vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-toast--visible {
  transform: translateX(-50%) translateY(0);
}

.app-toast--success { background: #2d5a27; border: 2px solid #4a8c3f; }
.app-toast--error { background: #8B1A1A; border: 2px solid #C41A1A; }
.app-toast--info { background: #2C2C2C; border: 2px solid #C9A84C; }

/* ---- App Modal 样式 ---- */
.app-modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.6);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.app-modal {
  background: #F5F0E8;
  border-radius: 6px;
  max-width: 420px;
  width: 90%;
  transform: scale(0.8);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- Fusion Result Modal ---- */
.fusion-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.fusion-modal {
  background: var(--color-white);
  border-radius: 12px;
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  border: 2px solid var(--color-gold);
}