/* ========================================
   Shared UI Components
   ======================================== */

/* ---- Navigation ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  text-decoration: none;
}

.nav-logo img {
  height: 28px;
  width: auto;
}

.nav-logo-text {
  letter-spacing: 2px;
  color: var(--color-primary);
}

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

.nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* User avatar in nav (logged-in state) */
.nav-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-user .avatar {
  width: 32px;
  height: 32px;
}

.nav-user-name {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition-base);
}

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

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-secondary);
  z-index: 999;
  padding: var(--space-6);
  flex-direction: column;
  gap: var(--space-4);
  overflow-y: auto;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border-primary);
}

@media (max-width: 768px) {
  .nav-links,
  .nav-actions .btn {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}

/* ---- Theme Toggle ---- */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--hover-bg);
  transition: background var(--transition-fast);
  font-size: var(--text-lg);
  line-height: 1;
}

.theme-toggle:hover {
  background: var(--border-primary);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  line-height: 1.5;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(217, 119, 6, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(217, 119, 6, 0.4);
  color: #ffffff;
}

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

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

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

.btn-ghost:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.btn-lg {
  padding: var(--space-3) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

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

/* ---- Cards ---- */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-glass {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] .card-glass {
  background: rgba(38, 38, 38, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
}

/* ---- Badges ---- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  line-height: 1.5;
}

.badge-primary {
  background: var(--color-primary-bg);
  color: var(--color-primary);
}

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

.badge-profit {
  background: var(--color-profit-bg);
  color: var(--color-profit);
}

.badge-loss {
  background: var(--color-loss-bg);
  color: var(--color-loss);
}

/* ---- Avatar ---- */
.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--bg-tertiary);
  flex-shrink: 0;
  border: 2px solid var(--border-primary);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-sm { width: 32px; height: 32px; }
.avatar-lg { width: 80px; height: 80px; }
.avatar-xl { width: 120px; height: 120px; }

.avatar-ring {
  border: 3px solid var(--color-primary);
}

/* ---- Modal ---- */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  max-width: 480px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.25s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  font-size: var(--text-xl);
  color: var(--text-secondary);
  transition: background var(--transition-fast);
}

.modal-close:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

/* ---- Forms ---- */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

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

/* ---- Divider ---- */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-5) 0;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-primary);
}

/* ---- Footer ---- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding: var(--space-10) 0 var(--space-6);
  margin-top: var(--space-12);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-brand-name {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  letter-spacing: 2px;
}

.footer-brand-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-primary);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* ---- Calculator Modal ---- */
.calc-modal {
  max-width: 360px;
  padding: var(--space-5);
}

.calc-display {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
  text-align: right;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.calc-display-expr {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  min-height: 1.5em;
  word-break: break-all;
}

.calc-display-value {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  line-height: 1.2;
  word-break: break-all;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.calc-btn {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
}

.calc-btn:active {
  transform: scale(0.95);
}

.calc-btn-num {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.calc-btn-num:hover {
  background: var(--border-primary);
}

.calc-btn-op {
  background: var(--bg-tertiary);
  color: var(--color-primary);
  font-weight: var(--font-bold);
}

.calc-btn-op:hover {
  background: var(--border-primary);
}

.calc-btn-op.active {
  background: var(--color-primary);
  color: #ffffff;
}

.calc-btn-func {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.calc-btn-func:hover {
  background: var(--border-primary);
}

.calc-btn-eq {
  background: var(--color-primary);
  color: #ffffff;
  grid-column: span 4;
  font-size: var(--text-xl);
}

.calc-btn-eq:hover {
  background: var(--color-primary-dark);
}

.calc-btn-wide {
  grid-column: span 2;
}

.calc-display-value.error {
  color: var(--color-profit);
  font-size: var(--text-xl);
}