:root {
    --bg-primary: #0b0c10;
    --bg-surface: rgba(19, 22, 28, 0.85);
    --bg-surface-elevated: #161922;
    --bg-input: rgba(255, 255, 255, 0.06);
    --bg-input-focus: rgba(255, 255, 255, 0.1);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(99, 102, 241, 0.5);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-primary: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --status-online: #10b981;
    --header-height: 60px;
    --radius-pill: 9999px;
    --radius-md: 10px;
    --radius-sm: 6px;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Base App Layout */
#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==========================================================================
   Header Component (Persistent)
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background-color: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    user-select: none;
}

/* --- Container 1: Left (Logo & Breadcrumbs) --- */
.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    transition: opacity var(--transition-fast);
    flex-shrink: 0;
}

.brand-logo:hover {
    opacity: 0.9;
}

.brand-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    border-radius: 6px;
}

.brand-text {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.06em;
    display: flex;
    align-items: center;
    gap: 6px;
}

.version-tag {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 5px;
    border-radius: 4px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #ffffff;
    letter-spacing: 0.04em;
}

.breadcrumb-separator {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 300;
}

.breadcrumbs {
    display: flex;
    align-items: center;
    min-width: 0;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.breadcrumb-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
    color: var(--text-primary);
}

.breadcrumb-item.active {
    color: var(--text-primary);
    font-weight: 500;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    color: var(--text-muted);
    font-weight: 300;
}

/* --- Container 2 & 3: Right Aligned Group --- */
.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

/* --- Container 2: Search Pill --- */
.search-pill {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    padding: 6px 12px 6px 14px;
    width: 260px;
    transition: all var(--transition-fast);
}

.search-pill:hover {
    background-color: var(--bg-input-focus);
    border-color: rgba(255, 255, 255, 0.16);
}

.search-pill.focused {
    background-color: var(--bg-input-focus);
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
    width: 320px;
}

.search-icon {
    color: var(--text-muted);
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.search-pill.focused .search-icon {
    color: var(--accent-primary);
}

.search-input {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 13.5px;
    padding: 0 8px;
}

.search-input::placeholder {
    color: var(--text-muted);
    font-size: 13px;
}

.search-clear {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    line-height: 1;
    padding: 0 4px;
    transition: color var(--transition-fast);
}

.search-clear:hover {
    color: var(--text-primary);
}

.search-shortcut {
    display: flex;
    align-items: center;
    pointer-events: none;
}

.kbd-key {
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 4px;
    padding: 1px 5px;
    font-family: inherit;
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.2;
}

/* --- Container 3: Profile with Dropdown Indicator --- */
.profile-container {
    position: relative;
}

.profile-btn {
    display: flex;
    align-items: center;
    gap: 7px;
    background: transparent;
    border: 1px solid transparent;
    padding: 3px 6px 3px 3px;
    border-radius: var(--radius-pill);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.profile-btn:hover,
.profile-btn[aria-expanded="true"] {
    background-color: rgba(255, 255, 255, 0.07);
    border-color: var(--border-subtle);
    color: var(--text-primary);
}

.avatar-ring {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4f46e5, #06b6d4);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    flex-shrink: 0;
}

.avatar-fallback {
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.02em;
}

.chevron-icon {
    transition: transform var(--transition-fast);
}

.profile-btn[aria-expanded="true"] .chevron-icon {
    transform: rotate(180deg);
}

/* Dropdown Card */
.profile-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 220px;
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    padding: 6px;
    display: flex;
    flex-direction: column;
    z-index: 1001;
    transform-origin: top right;
    animation: dropdownFadeIn 120ms cubic-bezier(0, 0, 0.2, 1);
}

.profile-dropdown[hidden] {
    display: none !important;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-4px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.dropdown-header {
    padding: 8px 10px;
}

.dropdown-user-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.dropdown-username {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-primary);
}

.dropdown-server-status {
    font-size: 11.5px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--status-online);
    display: inline-block;
    box-shadow: 0 0 6px var(--status-online);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-subtle);
    margin: 4px 0;
}

.dropdown-menu {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dropdown-item:hover,
.dropdown-item:focus-visible {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    outline: none;
}

.dropdown-item-danger {
    color: #f87171;
}

.dropdown-item-danger:hover {
    background-color: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
}

/* ==========================================================================
   Main Content Area (Ready for media grids, views, etc.)
   ========================================================================== */
.main-content {
    flex: 1;
    padding: 32px 24px;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 640px) {
    .site-header {
        padding: 0 14px;
    }
    .brand-text {
        display: none;
    }
    .breadcrumb-separator {
        display: none;
    }
    .search-pill {
        width: 180px;
    }
    .search-pill.focused {
        width: 220px;
    }
    .search-shortcut {
        display: none;
    }
}