/* @qmf/header – Unified 3-zone header */

.qmf-header {
  position: sticky;
  top: 0;
  z-index: var(--qmf-z-header, 1000);
  width: 100%;
  height: var(--qmf-header-height, 56px);
  background: var(--qmf-color-surface, #fff);
  border-bottom: 1px solid var(--qmf-color-border, #e5e7eb);
  box-shadow: var(--qmf-shadow-sm);
  font-family: var(--qmf-font-sans, system-ui, sans-serif);
}

.qmf-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--qmf-spacing-4, 16px);
  gap: var(--qmf-spacing-3, 12px);
}

/* ─── Clusters ─────────────────────────────────────────── */

.qmf-header__cluster {
  display: flex;
  align-items: center;
  gap: var(--qmf-spacing-2, 8px);
}

.qmf-header__cluster--left {
  justify-content: flex-start;
}

.qmf-header__cluster--center {
  justify-content: center;
}

.qmf-header__cluster--right {
  justify-content: flex-end;
}

/* ─── Brand (LEFT) ─────────────────────────────────────── */

.qmf-header__brand {
  display: flex;
  align-items: center;
  gap: var(--qmf-spacing-2, 8px);
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
}

.qmf-header__logo {
  height: 32px;
  width: auto;
  object-fit: contain;
}

.qmf-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.qmf-header__brand-name {
  font-size: var(--qmf-text-lg, 18px);
  font-weight: var(--qmf-font-bold, 700);
  background: linear-gradient(135deg, var(--qmf-color-primary, #6366f1), var(--qmf-color-secondary, #06b6d4));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

.qmf-header__page-title {
  font-size: var(--qmf-text-xs, 11px);
  color: var(--qmf-color-muted, #9ca3af);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
}

/* ─── Main Logo (CENTER) ───────────────────────────────── */

.qmf-header__main-logo {
  display: flex;
  align-items: center;
  gap: var(--qmf-spacing-2, 8px);
  text-decoration: none;
  color: inherit;
  transition: opacity var(--qmf-transition-fast, 150ms);
}

.qmf-header__main-logo:hover {
  opacity: 0.85;
}

.qmf-header__logo-img {
  height: 28px;
  width: auto;
}

.qmf-header__main-name {
  font-weight: var(--qmf-font-semibold, 600);
  font-size: var(--qmf-text-base, 16px);
  color: var(--qmf-color-text, #1f2937);
}

/* ─── Buttons (RIGHT) ──────────────────────────────────── */

.qmf-header__btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--qmf-radius-full, 9999px);
  background: transparent;
  color: var(--qmf-color-text-secondary, #6b7280);
  cursor: pointer;
  transition: background var(--qmf-transition-fast, 150ms), color var(--qmf-transition-fast, 150ms);
}

.qmf-header__btn:hover {
  background: var(--qmf-color-hover, rgba(0, 0, 0, 0.06));
  color: var(--qmf-color-text, #1f2937);
}

.qmf-header__btn:active {
  background: var(--qmf-color-active, rgba(0, 0, 0, 0.1));
}

.qmf-header__btn i {
  font-size: 16px;
}

.qmf-header__hamburger {
  display: none;
}

/* ─── Login Button ─────────────────────────────────────── */

.qmf-header__login-btn {
  flex-shrink: 0;
}

/* ─── User Dropdown (RIGHT) ────────────────────────────── */

.qmf-header__user {
  position: relative;
}

.qmf-header__user-toggle {
  display: flex;
  align-items: center;
  gap: var(--qmf-spacing-2, 8px);
  padding: var(--qmf-spacing-1, 4px) var(--qmf-spacing-2, 8px);
  border: none;
  border-radius: var(--qmf-radius-full, 9999px);
  background: transparent;
  cursor: pointer;
  color: var(--qmf-color-text, #1f2937);
  transition: background var(--qmf-transition-fast, 150ms);
}

.qmf-header__user-toggle:hover {
  background: var(--qmf-color-hover, rgba(0, 0, 0, 0.06));
}

.qmf-header__avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--qmf-color-surface-alt, #f3f4f6);
}

.qmf-header__user-name {
  font-size: var(--qmf-text-sm, 14px);
  font-weight: var(--qmf-font-medium, 500);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.qmf-header__user-toggle .fa-chevron-down {
  font-size: 10px;
  color: var(--qmf-color-muted, #9ca3af);
  transition: transform var(--qmf-transition-fast, 150ms);
}

/* ─── Responsive ───────────────────────────────────────── */

@media (max-width: 768px) {
  .qmf-header__inner {
    grid-template-columns: auto 1fr auto;
    padding: 0 var(--qmf-spacing-3, 12px);
  }

  .qmf-header__hamburger {
    display: inline-flex;
  }

  .qmf-header__brand-text {
    display: none;
  }

  .qmf-header__main-name {
    display: none;
  }

  .qmf-header__user-name {
    display: none;
  }
}

@media (max-width: 480px) {
  .qmf-header__cluster--center {
    display: none;
  }

  .qmf-header__inner {
    grid-template-columns: auto 1fr;
  }
}

/* ─── Dark theme ───────────────────────────────────────── */

[data-theme="dark"] .qmf-header {
  background: var(--qmf-color-surface, #1f2937);
  border-bottom-color: var(--qmf-color-border, #374151);
}