/**
 * STEP 1 EXPLORERS - UNIFIED NAVIGATION
 *
 * Shared navigation header for Conditions, Medications, and Bugs explorers.
 * Provides consistent navigation experience across all platforms.
 *
 * Last Updated: October 20, 2025
 * Phase: 3 - Shared Design System
 */

/* ========================================================================
   UNIFIED HEADER
   ======================================================================== */

.unified-header {
    background-color: var(--header-bg);
    padding: 20px 40px;
    border-bottom: 1px solid var(--header-border);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

/* ========================================================================
   EXPLORER TOGGLE BUTTONS
   ======================================================================== */

.explorer-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--color-bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.toggle-btn {
    padding: 8px 20px;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: background-color var(--transition-base),
                color var(--transition-base),
                transform var(--transition-fast);
    white-space: nowrap;
    position: relative;
}

.toggle-btn:hover:not(.disabled) {
    background-color: var(--color-bg-hover);
    transform: translateY(-1px);
}

.toggle-btn.active {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-sm);
}

.toggle-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.toggle-btn .badge {
    display: inline-block;
    margin-left: 6px;
    padding: 2px 6px;
    background-color: var(--status-info);
    color: var(--color-text-inverse);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
}

.toggle-btn.active .badge {
    background-color: rgba(255, 255, 255, 0.3);
}

/* ========================================================================
   SEARCH CONTAINER
   ======================================================================== */

.search-global {
    flex: 1;
    max-width: 500px;
    min-width: 200px;
}

.search-global input {
    width: 100%;
    height: var(--input-height);
    padding: var(--input-padding-y) var(--input-padding-x);
    border: 1px solid var(--input-border);
    border-radius: var(--input-radius);
    font-size: var(--font-size-base);
    background-color: var(--input-bg);
    color: var(--color-text-primary);
    transition: border-color var(--transition-base),
                box-shadow var(--transition-base);
}

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

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

/* ========================================================================
   HEADER ACTIONS
   ======================================================================== */

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.icon-button {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-primary);
    background: var(--color-bg-primary);
    color: var(--color-primary);
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: background-color var(--transition-base),
                color var(--transition-base),
                transform var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.icon-button:hover {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    transform: scale(1.05);
}

.icon-button:active {
    transform: scale(0.95);
}

.support-button {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--status-success);
    background: var(--status-success);
    color: var(--color-text-inverse);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    text-decoration: none;
    cursor: pointer;
    transition: background-color var(--transition-base),
                transform var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.support-button:hover {
    background-color: #1f8f4e;
    transform: translateY(-1px);
}

.support-button:active {
    transform: translateY(0);
}

/* ========================================================================
   BREADCRUMB NAVIGATION
   ======================================================================== */

.breadcrumb-nav {
    padding: 12px 40px;
    background-color: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border-primary);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

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

.breadcrumb-nav a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

.breadcrumb-nav span {
    margin: 0 8px;
}

.breadcrumb-nav .current {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-medium);
}

/* ========================================================================
   CONTEXT BANNER
   ======================================================================== */

.context-banner {
    padding: 12px 40px;
    background-color: var(--status-info-bg);
    border-bottom: 1px solid var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.context-banner .context-message {
    font-size: var(--font-size-sm);
    color: var(--status-info-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.context-banner .context-message strong {
    font-weight: var(--font-weight-semibold);
}

.context-banner .back-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: transform var(--transition-fast);
}

.context-banner .back-link:hover {
    transform: translateX(-2px);
    text-decoration: underline;
}

.context-banner .back-link::before {
    content: '←';
    font-size: 1.2em;
}

/* ========================================================================
   RESPONSIVE STYLES
   ======================================================================== */

@media (max-width: 992px) {
    .unified-header {
        padding: 18px 24px;
    }

    .breadcrumb-nav,
    .context-banner {
        padding: 12px 24px;
    }
}

@media (max-width: 768px) {
    .unified-header {
        padding: 16px 16px;
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .explorer-toggle {
        width: 100%;
        justify-content: center;
    }

    .toggle-btn {
        flex: 1;
        padding: 10px 12px;
        font-size: var(--font-size-sm);
    }

    .search-global {
        max-width: 100%;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .breadcrumb-nav,
    .context-banner {
        padding: 12px 16px;
    }

    .context-banner {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .toggle-btn {
        padding: 8px 10px;
        font-size: var(--font-size-xs);
    }

    .toggle-btn .badge {
        display: block;
        margin-left: 0;
        margin-top: 2px;
    }
}

/* ========================================================================
   ANIMATION - FADE IN
   ======================================================================== */

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

.unified-header {
    animation: fadeIn var(--duration-base) var(--ease-out);
}